From e60fb0804a1a71ac083035c4a1bb85667d9bd3cc Mon Sep 17 00:00:00 2001 From: psperl Date: Sun, 28 Oct 2007 22:54:03 +0000 Subject: [PATCH] functor fix from William Pitcock git-svn-id: https://projectm.svn.sourceforge.net/svnroot/projectm/trunk@633 6778bc44-b910-0410-a7a0-be141de4315d --- src/projectM-engine/SOIL.c | 24 +- src/projectM-engine/stb_image.c | 3283 ------------------------------- src/projectM-engine/stb_image.h | 253 --- 3 files changed, 12 insertions(+), 3548 deletions(-) delete mode 100644 src/projectM-engine/stb_image.c delete mode 100644 src/projectM-engine/stb_image.h diff --git a/src/projectM-engine/SOIL.c b/src/projectM-engine/SOIL.c index 8bec84c24..b0e4747ba 100644 --- a/src/projectM-engine/SOIL.c +++ b/src/projectM-engine/SOIL.c @@ -1417,12 +1417,11 @@ int query_DXT_capability( void ) } else { /* and find the address of the extension function */ - void *ext_addr = NULL; + P_SOIL_GLCOMPRESSEDTEXIMAGE2DPROC ext_addr = NULL; #ifdef WIN32 - ext_addr = (void*)wglGetProcAddress - ( - "glCompressedTexImage2DARB" - ); + ext_addr = (P_SOIL_GLCOMPRESSEDTEXIMAGE2DPROC) + wglGetProcAddress("glCompressedTexImage2DARB"); + #elif defined(__APPLE__) || defined(__APPLE_CC__) /* I can't test this Apple stuff! */ CFBundleRef bundle; @@ -1439,16 +1438,17 @@ int query_DXT_capability( void ) kCFStringEncodingASCII ); bundle = CFBundleCreate( kCFAllocatorDefault, bundleURL ); assert( bundle != NULL ); - ext_addr = CFBundleGetFunctionPointerForName( - bundle, extensionName ); + ext_addr = (P_SOIL_GLCOMPRESSEDTEXIMAGE2DPROC) + CFBundleGetFunctionPointerForName( bundle, extensionName ); + + CFRelease( bundleURL ); CFRelease( functionName ); CFRelease( bundle ); #else - ext_addr = (void*)glXGetProcAddressARB - ( - (const GLubyte *)"glCompressedTexImage2DARB" - ); + ext_addr = (P_SOIL_GLCOMPRESSEDTEXIMAGE2DPROC) + glXGetProcAddress((const GLubyte *)"glCompressedTexImage2DARB"); + #endif /* Flag it so no checks needed later */ if( NULL == ext_addr ) @@ -1463,7 +1463,7 @@ int query_DXT_capability( void ) } else { /* all's well! */ - soilGlCompressedTexImage2D = (P_SOIL_GLCOMPRESSEDTEXIMAGE2DPROC)ext_addr; + soilGlCompressedTexImage2D = ext_addr; has_DXT_capability = SOIL_DXT_DIRECT_UPLOAD; } } diff --git a/src/projectM-engine/stb_image.c b/src/projectM-engine/stb_image.c deleted file mode 100644 index bf20190dc..000000000 --- a/src/projectM-engine/stb_image.c +++ /dev/null @@ -1,3283 +0,0 @@ -/* stbi-1.00 - public domain JPEG/PNG reader - http://nothings.org/stb_image.c - when you control the images you're loading - - QUICK NOTES: - Primarily of interest to game developers and other people who can - avoid problematic images and only need the trivial interface - - JPEG baseline (no JPEG progressive, no oddball channel decimations) - PNG non-interlaced - BMP non-1bpp, non-RLE - writes BMP,TGA (define STBI_NO_WRITE to remove code) - decoded from memory or through stdio FILE (define STBI_NO_STDIO to remove code) - - TODO: - stbi_info_* - PSD loader - - history: - 1.00 interface to zlib that skips zlib header - 0.99 correct handling of alpha in palette - 0.98 TGA loader by lonesock; dynamically add loaders (untested) - 0.97 jpeg errors on too large a file; also catch another malloc failure - 0.96 fix detection of invalid v value - particleman@mollyrocket forum - 0.95 during header scan, seek to markers in case of padding - 0.94 STBI_NO_STDIO to disable stdio usage; rename all #defines the same - 0.93 handle jpegtran output; verbose errors - 0.92 read 4,8,16,24,32-bit BMP files of several formats - 0.91 output 24-bit Windows 3.0 BMP files - 0.90 fix a few more warnings; bump version number to approach 1.0 - 0.61 bugfixes due to Marc LeBlanc, Christopher Lloyd - 0.60 fix compiling as c++ - 0.59 fix warnings: merge Dave Moore's -Wall fixes - 0.58 fix bug: zlib uncompressed mode len/nlen was wrong endian - 0.57 fix bug: jpg last huffman symbol before marker was >9 bits but less - than 16 available - 0.56 fix bug: zlib uncompressed mode len vs. nlen - 0.55 fix bug: restart_interval not initialized to 0 - 0.54 allow NULL for 'int *comp' - 0.53 fix bug in png 3->4; speedup png decoding - 0.52 png handles req_comp=3,4 directly; minor cleanup; jpeg comments - 0.51 obey req_comp requests, 1-component jpegs return as 1-component, - on 'test' only check type, not whether we support this variant -*/ - -#include "stb_image.h" - -#ifndef STBI_NO_STDIO -#include -#endif -#include -#include -#include -#include - -#ifndef _MSC_VER -#define __forceinline -#endif - -// implementation: -typedef unsigned char uint8; -typedef unsigned short uint16; -typedef signed short int16; -typedef unsigned int uint32; -typedef signed int int32; -typedef unsigned int uint; - -// should produce compiler error if size is wrong -typedef unsigned char validate_uint32[sizeof(uint32)==4]; - -#if defined(STBI_NO_STDIO) && !defined(STBI_NO_WRITE) -#define STBI_NO_WRITE -#endif - -////////////////////////////////////////////////////////////////////////////// -// -// Generic API that works on all image types -// - -// I (JLD) want full messages for SOIL -#define STBI_FAILURE_USERMSG 1 - -static char *failure_reason; - -char *stbi_failure_reason(void) -{ - return failure_reason; -} - -static int e(char *str) -{ - failure_reason = str; - return 0; -} - -#ifdef STBI_NO_FAILURE_STRINGS - #define e(x,y) 0 -#elif defined(STBI_FAILURE_USERMSG) - #define e(x,y) e(y) -#else - #define e(x,y) e(x) -#endif - -#define ep(x,y) (e(x,y),NULL) - -void stbi_image_free(unsigned char *retval_from_stbi_load) -{ - free(retval_from_stbi_load); -} - -#define MAX_LOADERS 32 -stbi_loader *loaders[MAX_LOADERS]; -static int max_loaders = 0; - -int stbi_register_loader(stbi_loader *loader) -{ - int i; - for (i=0; i < MAX_LOADERS; ++i) { - // already present? - if (loaders[i] == loader) - return 1; - // end of the list? - if (loaders[i] == NULL) { - loaders[i] = loader; - max_loaders = i+1; - return 1; - } - } - // no room for it - return 0; -} - -#ifndef STBI_NO_STDIO -unsigned char *stbi_load(char *filename, int *x, int *y, int *comp, int req_comp) -{ - FILE *f = fopen(filename, "rb"); - unsigned char *result; - if (!f) return ep("can't fopen", "Unable to open file"); - result = stbi_load_from_file(f,x,y,comp,req_comp); - fclose(f); - return result; -} - -unsigned char *stbi_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp) -{ - int i; - if (stbi_jpeg_test_file(f)) - return stbi_jpeg_load_from_file(f,x,y,comp,req_comp); - if (stbi_png_test_file(f)) - return stbi_png_load_from_file(f,x,y,comp,req_comp); - if (stbi_bmp_test_file(f)) - return stbi_bmp_load_from_file(f,x,y,comp,req_comp); - if (stbi_dds_test_file(f)) - return stbi_dds_load_from_file(f,x,y,comp,req_comp); - if (stbi_tga_test_file(f)) - return stbi_tga_load_from_file(f,x,y,comp,req_comp); - for (i=0; i < max_loaders; ++i) - if (loaders[i]->test_file(f)) - return loaders[i]->load_from_file(f,x,y,comp,req_comp); - return ep("unknown image type", "Image not of any known type, or corrupt"); -} -#endif - -unsigned char *stbi_load_from_memory(stbi_uc *buffer, int len, int *x, int *y, int *comp, int req_comp) -{ - int i; - if (stbi_jpeg_test_memory(buffer,len)) - return stbi_jpeg_load_from_memory(buffer,len,x,y,comp,req_comp); - if (stbi_png_test_memory(buffer,len)) - return stbi_png_load_from_memory(buffer,len,x,y,comp,req_comp); - if (stbi_bmp_test_memory(buffer,len)) - return stbi_bmp_load_from_memory(buffer,len,x,y,comp,req_comp); - if (stbi_dds_test_memory(buffer,len)) - return stbi_dds_load_from_memory(buffer,len,x,y,comp,req_comp); - if (stbi_tga_test_memory(buffer,len)) - return stbi_tga_load_from_memory(buffer,len,x,y,comp,req_comp); - for (i=0; i < max_loaders; ++i) - if (loaders[i]->test_memory(buffer,len)) - return loaders[i]->load_from_memory(buffer,len,x,y,comp,req_comp); - return ep("unknown image type", "Image not of any known type, or corrupt"); -} - -// @TODO: get image dimensions & components without fully decoding -extern int stbi_info (char *filename, int *x, int *y, int *comp); -extern int stbi_info_from_file (FILE *f, int *x, int *y, int *comp); -extern int stbi_info_from_memory(stbi_uc *buffer, int len, int *x, int *y, int *comp); - -////////////////////////////////////////////////////////////////////////////// -// -// Common code used by all image loaders -// - -// image width, height, # components -static uint32 img_x, img_y; -static int img_n, img_out_n; - -enum -{ - SCAN_load=0, - SCAN_type, - SCAN_header, -}; - -// An API for reading either from memory or file. -// It fits on a single screen. No abstract base classes needed. -#ifndef STBI_NO_STDIO -static FILE *img_file; -#endif -static uint8 *img_buffer, *img_buffer_end; - -#ifndef STBI_NO_STDIO -static void start_file(FILE *f) -{ - img_file = f; -} -#endif - -static void start_mem(uint8 *buffer, int len) -{ -#ifndef STBI_NO_STDIO - img_file = NULL; -#endif - img_buffer = buffer; - img_buffer_end = buffer+len; -} - -static int get8(void) -{ -#ifndef STBI_NO_STDIO - if (img_file) { - int c = fgetc(img_file); - return c == EOF ? 0 : c; - } -#endif - if (img_buffer < img_buffer_end) - return *img_buffer++; - return 0; -} - -static int at_eof(void) -{ -#ifndef STBI_NO_STDIO - if (img_file) - return feof(img_file); -#endif - return img_buffer >= img_buffer_end; -} - -static uint8 get8u(void) -{ - return (uint8) get8(); -} - -static void skip(int n) -{ -#ifndef STBI_NO_STDIO - if (img_file) - fseek(img_file, n, SEEK_CUR); - else -#endif - img_buffer += n; -} - -static int get16(void) -{ - int z = get8(); - return (z << 8) + get8(); -} - -static uint32 get32(void) -{ - uint32 z = get16(); - return (z << 16) + get16(); -} - -static int get16le(void) -{ - int z = get8(); - return z + (get8() << 8); -} - -static uint32 get32le(void) -{ - uint32 z = get16le(); - return z + (get16le() << 16); -} - -static void getn(stbi_uc *buffer, int n) -{ -#ifndef STBI_NO_STDIO - if (img_file) { - fread(buffer, 1, n, img_file); - return; - } -#endif - memcpy(buffer, img_buffer, n); - img_buffer += n; -} - -////////////////////////////////////////////////////////////////////////////// -// -// generic converter from built-in img_n to req_comp -// individual types do this automatically as much as possible (e.g. jpeg -// does all cases internally since it needs to colorspace convert anyway, -// and it never has alpha, so very few cases ). png can automatically -// interleave an alpha=255 channel, but falls back to this for other cases -// -// assume data buffer is malloced, so malloc a new one and free that one -// only failure mode is malloc failing - -static uint8 compute_y(int r, int g, int b) -{ - return (uint8) (((r*77) + (g*150) + (29*b)) >> 8); -} - -static unsigned char *convert_format(unsigned char *data, int img_n, int req_comp) -{ - uint i,j; - unsigned char *good; - - if (req_comp == img_n) return data; - assert(req_comp >= 1 && req_comp <= 4); - - good = (unsigned char *) malloc(req_comp * img_x * img_y); - if (good == NULL) { - free(data); - return ep("outofmem", "Out of memory"); - } - - for (j=0; j < img_y; ++j) { - unsigned char *src = data + j * img_x * img_n ; - unsigned char *dest = good + j * img_x * req_comp; - - #define COMBO(a,b) ((a)*8+(b)) - #define CASE(a,b) case COMBO(a,b): for(i=0; i < img_x; ++i, src += a, dest += b) - - // convert source image with img_n components to one with req_comp components - switch(COMBO(img_n, req_comp)) { - CASE(1,2) dest[0]=src[0], dest[1]=255; break; - CASE(1,3) dest[0]=dest[1]=dest[2]=src[0]; break; - CASE(1,4) dest[0]=dest[1]=dest[2]=src[0], dest[3]=255; break; - CASE(2,1) dest[0]=src[0]; break; - CASE(2,3) dest[0]=dest[1]=dest[2]=src[0]; break; - CASE(2,4) dest[0]=dest[1]=dest[2]=src[0], dest[3]=src[1]; break; - CASE(3,4) dest[0]=src[0],dest[1]=src[1],dest[2]=src[2],dest[3]=255; break; - CASE(3,1) dest[0]=compute_y(src[0],src[1],src[2]); break; - CASE(3,2) dest[0]=compute_y(src[0],src[1],src[2]), dest[1] = 255; break; - CASE(4,1) dest[0]=compute_y(src[0],src[1],src[2]); break; - CASE(4,2) dest[0]=compute_y(src[0],src[1],src[2]), dest[1] = src[3]; break; - CASE(4,3) dest[0]=src[0],dest[1]=src[1],dest[2]=src[2]; break; - default: assert(0); - } - #undef CASE - } - - free(data); - img_out_n = req_comp; - return good; -} - -////////////////////////////////////////////////////////////////////////////// -// -// "baseline" JPEG/JFIF decoder (not actually fully baseline implementation) -// -// simple implementation -// - channel subsampling of at most 2 in each dimension -// - doesn't support delayed output of y-dimension -// - simple interface (only one output format: 8-bit interleaved RGB) -// - doesn't try to recover corrupt jpegs -// - doesn't allow partial loading, loading multiple at once -// - still fast on x86 (copying globals into locals doesn't help x86) -// - allocates lots of intermediate memory (full size of all components) -// - non-interleaved case requires this anyway -// - allows good upsampling (see next) -// high-quality -// - upsampled channels are bilinearly interpolated, even across blocks -// - quality integer IDCT derived from IJG's 'slow' -// performance -// - fast huffman; reasonable integer IDCT -// - uses a lot of intermediate memory, could cache poorly -// - load http://nothings.org/remote/anemones.jpg 3 times on 2.8Ghz P4 -// stb_jpeg: 1.34 seconds (MSVC6, default release build) -// stb_jpeg: 1.06 seconds (MSVC6, processor = Pentium Pro) -// IJL11.dll: 1.08 seconds (compiled by intel) -// IJG 1998: 0.98 seconds (MSVC6, makefile provided by IJG) -// IJG 1998: 0.95 seconds (MSVC6, makefile + proc=PPro) - -int stbi_jpeg_dc_only; - -// huffman decoding acceleration -#define FAST_BITS 9 // larger handles more cases; smaller stomps less cache - -typedef struct -{ - uint8 fast[1 << FAST_BITS]; - // weirdly, repacking this into AoS is a 10% speed loss, instead of a win - uint16 code[256]; - uint8 values[256]; - uint8 size[257]; - unsigned int maxcode[18]; - int delta[17]; // old 'firstsymbol' - old 'firstcode' -} huffman; - -static huffman huff_dc[4]; // baseline is 2 tables, extended is 4 -static huffman huff_ac[4]; -static uint8 dequant[4][64]; - -static int build_huffman(huffman *h, int *count) -{ - int i,j,k=0,code; - // build size list for each symbol (from JPEG spec) - for (i=0; i < 16; ++i) - for (j=0; j < count[i]; ++j) - h->size[k++] = (uint8) (i+1); - h->size[k] = 0; - - // compute actual symbols (from jpeg spec) - code = 0; - k = 0; - for(j=1; j <= 16; ++j) { - // compute delta to add to code to compute symbol id - h->delta[j] = k - code; - if (h->size[k] == j) { - while (h->size[k] == j) - h->code[k++] = (uint16) (code++); - if (code-1 >= (1 << j)) return e("bad code lengths","Corrupt JPEG"); - } - // compute largest code + 1 for this size, preshifted as needed later - h->maxcode[j] = code << (16-j); - code <<= 1; - } - h->maxcode[j] = 0xffffffff; - - // build non-spec acceleration table; 255 is flag for not-accelerated - memset(h->fast, 255, 1 << FAST_BITS); - for (i=0; i < k; ++i) { - int s = h->size[i]; - if (s <= FAST_BITS) { - int c = h->code[i] << (FAST_BITS-s); - int m = 1 << (FAST_BITS-s); - for (j=0; j < m; ++j) { - h->fast[c+j] = (uint8) i; - } - } - } - return 1; -} - -// sizes for components, interleaved MCUs -static int img_h_max, img_v_max; -static int img_mcu_x, img_mcu_y; -static int img_mcu_w, img_mcu_h; - -// definition of jpeg image component -static struct -{ - int id; - int h,v; - int tq; - int hd,ha; - int dc_pred; - - int x,y,w2,h2; - uint8 *data; -} img_comp[4]; - -static unsigned long code_buffer; // jpeg entropy-coded buffer -static int code_bits; // number of valid bits -static unsigned char marker; // marker seen while filling entropy buffer -static int nomore; // flag if we saw a marker so must stop - -static void grow_buffer_unsafe(void) -{ - do { - int b = nomore ? 0 : get8(); - if (b == 0xff) { - int c = get8(); - if (c != 0) { - marker = (unsigned char) c; - nomore = 1; - return; - } - } - code_buffer = (code_buffer << 8) | b; - code_bits += 8; - } while (code_bits <= 24); -} - -// (1 << n) - 1 -static unsigned long bmask[17]={0,1,3,7,15,31,63,127,255,511,1023,2047,4095,8191,16383,32767,65535}; - -// decode a jpeg huffman value from the bitstream -__forceinline static int decode(huffman *h) -{ - unsigned int temp; - int c,k; - - if (code_bits < 16) grow_buffer_unsafe(); - - // look at the top FAST_BITS and determine what symbol ID it is, - // if the code is <= FAST_BITS - c = (code_buffer >> (code_bits - FAST_BITS)) & ((1 << FAST_BITS)-1); - k = h->fast[c]; - if (k < 255) { - if (h->size[k] > code_bits) - return -1; - code_bits -= h->size[k]; - return h->values[k]; - } - - // naive test is to shift the code_buffer down so k bits are - // valid, then test against maxcode. To speed this up, we've - // preshifted maxcode left so that it has (16-k) 0s at the - // end; in other words, regardless of the number of bits, it - // wants to be compared against something shifted to have 16; - // that way we don't need to shift inside the loop. - if (code_bits < 16) - temp = (code_buffer << (16 - code_bits)) & 0xffff; - else - temp = (code_buffer >> (code_bits - 16)) & 0xffff; - for (k=FAST_BITS+1 ; ; ++k) - if (temp < h->maxcode[k]) - break; - if (k == 17) { - // error! code not found - code_bits -= 16; - return -1; - } - - if (k > code_bits) - return -1; - - // convert the huffman code to the symbol id - c = ((code_buffer >> (code_bits - k)) & bmask[k]) + h->delta[k]; - assert((((code_buffer) >> (code_bits - h->size[c])) & bmask[h->size[c]]) == h->code[c]); - - // convert the id to a symbol - code_bits -= k; - return h->values[c]; -} - -// combined JPEG 'receive' and JPEG 'extend', since baseline -// always extends everything it receives. -__forceinline static int extend_receive(int n) -{ - unsigned int m = 1 << (n-1); - unsigned int k; - if (code_bits < n) grow_buffer_unsafe(); - k = (code_buffer >> (code_bits - n)) & bmask[n]; - code_bits -= n; - // the following test is probably a random branch that won't - // predict well. I tried to table accelerate it but failed. - // maybe it's compiling as a conditional move? - if (k < m) - return (-1 << n) + k + 1; - else - return k; -} - -// given a value that's at position X in the zigzag stream, -// where does it appear in the 8x8 matrix coded as row-major? -static uint8 dezigzag[64+15] = -{ - 0, 1, 8, 16, 9, 2, 3, 10, - 17, 24, 32, 25, 18, 11, 4, 5, - 12, 19, 26, 33, 40, 48, 41, 34, - 27, 20, 13, 6, 7, 14, 21, 28, - 35, 42, 49, 56, 57, 50, 43, 36, - 29, 22, 15, 23, 30, 37, 44, 51, - 58, 59, 52, 45, 38, 31, 39, 46, - 53, 60, 61, 54, 47, 55, 62, 63, - // let corrupt input sample past end - 63, 63, 63, 63, 63, 63, 63, 63, - 63, 63, 63, 63, 63, 63, 63 -}; - -// decode one 64-entry block-- -static int decode_block(short data[64], huffman *hdc, huffman *hac, int b) -{ - int diff,dc,k; - int t = decode(hdc); - if (t < 0) return e("bad huffman code","Corrupt JPEG"); - - // 0 all the ac values now so we can do it 32-bits at a time - memset(data,0,64*sizeof(data[0])); - - diff = t ? extend_receive(t) : 0; - dc = img_comp[b].dc_pred + diff; - img_comp[b].dc_pred = dc; - data[0] = (short) dc; - - // decode AC components, see JPEG spec - k = 1; - do { - int r,s; - int rs = decode(hac); - if (rs < 0) return e("bad huffman code","Corrupt JPEG"); - s = rs & 15; - r = rs >> 4; - if (s == 0) { - if (rs != 0xf0) break; // end block - k += 16; - } else { - k += r; - // decode into unzigzag'd location - data[dezigzag[k++]] = (short) extend_receive(s); - } - } while (k < 64); - return 1; -} - -// take a -128..127 value and clamp it and convert to 0..255 -__forceinline static uint8 clamp(int x) -{ - x += 128; - // trick to use a single test to catch both cases - if ((unsigned int) x > 255) { - if (x < 0) return 0; - if (x > 255) return 255; - } - return (uint8) x; -} - -#define f2f(x) (int) (((x) * 4096 + 0.5)) -#define fsh(x) ((x) << 12) - -// derived from jidctint -- DCT_ISLOW -#define IDCT_1D(s0,s1,s2,s3,s4,s5,s6,s7) \ - int t0,t1,t2,t3,p1,p2,p3,p4,p5,x0,x1,x2,x3; \ - p2 = s2; \ - p3 = s6; \ - p1 = (p2+p3) * f2f(0.5411961f); \ - t2 = p1 + p3*f2f(-1.847759065f); \ - t3 = p1 + p2*f2f( 0.765366865f); \ - p2 = s0; \ - p3 = s4; \ - t0 = fsh(p2+p3); \ - t1 = fsh(p2-p3); \ - x0 = t0+t3; \ - x3 = t0-t3; \ - x1 = t1+t2; \ - x2 = t1-t2; \ - t0 = s7; \ - t1 = s5; \ - t2 = s3; \ - t3 = s1; \ - p3 = t0+t2; \ - p4 = t1+t3; \ - p1 = t0+t3; \ - p2 = t1+t2; \ - p5 = (p3+p4)*f2f( 1.175875602f); \ - t0 = t0*f2f( 0.298631336f); \ - t1 = t1*f2f( 2.053119869f); \ - t2 = t2*f2f( 3.072711026f); \ - t3 = t3*f2f( 1.501321110f); \ - p1 = p5 + p1*f2f(-0.899976223f); \ - p2 = p5 + p2*f2f(-2.562915447f); \ - p3 = p3*f2f(-1.961570560f); \ - p4 = p4*f2f(-0.390180644f); \ - t3 += p1+p4; \ - t2 += p2+p3; \ - t1 += p2+p4; \ - t0 += p1+p3; - -// .344 seconds on 3*anemones.jpg -static void idct_block(uint8 *out, int out_stride, short data[64], uint8 *dequantize) -{ - int i,val[64],*v=val; - uint8 *o,*dq = dequantize; - short *d = data; - - if (stbi_jpeg_dc_only) { - // ok, I don't really know why this is right, but it seems to be: - int z = 128 + ((d[0] * dq[0]) >> 3); - for (i=0; i < 8; ++i) { - out[0] = out[1] = out[2] = out[3] = out[4] = out[5] = out[6] = out[7] = z; - out += out_stride; - } - return; - } - - // columns - for (i=0; i < 8; ++i,++d,++dq, ++v) { - // if all zeroes, shortcut -- this avoids dequantizing 0s and IDCTing - if (d[ 8]==0 && d[16]==0 && d[24]==0 && d[32]==0 - && d[40]==0 && d[48]==0 && d[56]==0) { - // no shortcut 0 seconds - // (1|2|3|4|5|6|7)==0 0 seconds - // all separate -0.047 seconds - // 1 && 2|3 && 4|5 && 6|7: -0.047 seconds - int dcterm = d[0] * dq[0] << 2; - v[0] = v[8] = v[16] = v[24] = v[32] = v[40] = v[48] = v[56] = dcterm; - } else { - IDCT_1D(d[ 0]*dq[ 0],d[ 8]*dq[ 8],d[16]*dq[16],d[24]*dq[24], - d[32]*dq[32],d[40]*dq[40],d[48]*dq[48],d[56]*dq[56]) - // constants scaled things up by 1<<12; let's bring them back - // down, but keep 2 extra bits of precision - x0 += 512; x1 += 512; x2 += 512; x3 += 512; - v[ 0] = (x0+t3) >> 10; - v[56] = (x0-t3) >> 10; - v[ 8] = (x1+t2) >> 10; - v[48] = (x1-t2) >> 10; - v[16] = (x2+t1) >> 10; - v[40] = (x2-t1) >> 10; - v[24] = (x3+t0) >> 10; - v[32] = (x3-t0) >> 10; - } - } - - for (i=0, v=val, o=out; i < 8; ++i,v+=8,o+=out_stride) { - // no fast case since the first 1D IDCT spread components out - IDCT_1D(v[0],v[1],v[2],v[3],v[4],v[5],v[6],v[7]) - // constants scaled things up by 1<<12, plus we had 1<<2 from first - // loop, plus horizontal and vertical each scale by sqrt(8) so together - // we've got an extra 1<<3, so 1<<17 total we need to remove. - x0 += 65536; x1 += 65536; x2 += 65536; x3 += 65536; - o[0] = clamp((x0+t3) >> 17); - o[7] = clamp((x0-t3) >> 17); - o[1] = clamp((x1+t2) >> 17); - o[6] = clamp((x1-t2) >> 17); - o[2] = clamp((x2+t1) >> 17); - o[5] = clamp((x2-t1) >> 17); - o[3] = clamp((x3+t0) >> 17); - o[4] = clamp((x3-t0) >> 17); - } -} - -#define MARKER_none 0xff -// if there's a pending marker from the entropy stream, return that -// otherwise, fetch from the stream and get a marker. if there's no -// marker, return 0xff, which is never a valid marker value -static uint8 get_marker(void) -{ - uint8 x; - if (marker != MARKER_none) { x = marker; marker = MARKER_none; return x; } - x = get8u(); - if (x != 0xff) return MARKER_none; - while (x == 0xff) - x = get8u(); - return x; -} - -// in each scan, we'll have scan_n components, and the order -// of the components is specified by order[] -static int scan_n, order[4]; -static int restart_interval, todo; -#define RESTART(x) ((x) >= 0xd0 && (x) <= 0xd7) - -// after a restart interval, reset the entropy decoder and -// the dc prediction -static void reset(void) -{ - code_bits = 0; - code_buffer = 0; - nomore = 0; - img_comp[0].dc_pred = img_comp[1].dc_pred = img_comp[2].dc_pred = 0; - marker = MARKER_none; - todo = restart_interval ? restart_interval : 0x7fffffff; - // no more than 1<<31 MCUs if no restart_interal? that's plenty safe, - // since we don't even allow 1<<30 pixels -} - -static int parse_entropy_coded_data(void) -{ - reset(); - if (scan_n == 1) { - int i,j; - short data[64]; - int n = order[0]; - // non-interleaved data, we just need to process one block at a time, - // in trivial scanline order - // number of blocks to do just depends on how many actual "pixels" this - // component has, independent of interleaved MCU blocking and such - int w = (img_comp[n].x+7) >> 3; - int h = (img_comp[n].y+7) >> 3; - for (j=0; j < h; ++j) { - for (i=0; i < w; ++i) { - if (!decode_block(data, huff_dc+img_comp[n].hd, huff_ac+img_comp[n].ha, n)) return 0; - idct_block(img_comp[n].data+img_comp[n].w2*j*8+i*8, img_comp[n].w2, data, dequant[img_comp[n].tq]); - // every data block is an MCU, so countdown the restart interval - if (--todo <= 0) { - if (code_bits < 24) grow_buffer_unsafe(); - // if it's NOT a restart, then just bail, so we get corrupt data - // rather than no data - if (!RESTART(marker)) return 1; - reset(); - } - } - } - } else { // interleaved! - int i,j,k,x,y; - short data[64]; - for (j=0; j < img_mcu_y; ++j) { - for (i=0; i < img_mcu_x; ++i) { - // scan an interleaved mcu... process scan_n components in order - for (k=0; k < scan_n; ++k) { - int n = order[k]; - // scan out an mcu's worth of this component; that's just determined - // by the basic H and V specified for the component - for (y=0; y < img_comp[n].v; ++y) { - for (x=0; x < img_comp[n].h; ++x) { - int x2 = (i*img_comp[n].h + x)*8; - int y2 = (j*img_comp[n].v + y)*8; - if (!decode_block(data, huff_dc+img_comp[n].hd, huff_ac+img_comp[n].ha, n)) return 0; - idct_block(img_comp[n].data+img_comp[n].w2*y2+x2, img_comp[n].w2, data, dequant[img_comp[n].tq]); - } - } - } - // after all interleaved components, that's an interleaved MCU, - // so now count down the restart interval - if (--todo <= 0) { - if (code_bits < 24) grow_buffer_unsafe(); - // if it's NOT a restart, then just bail, so we get corrupt data - // rather than no data - if (!RESTART(marker)) return 1; - reset(); - } - } - } - } - return 1; -} - -static int process_marker(int m) -{ - int L; - switch (m) { - case MARKER_none: // no marker found - return e("expected marker","Corrupt JPEG"); - - case 0xC2: // SOF - progressive - return e("progressive jpeg","JPEG format not supported (progressive)"); - - case 0xDD: // DRI - specify restart interval - if (get16() != 4) return e("bad DRI len","Corrupt JPEG"); - restart_interval = get16(); - return 1; - - case 0xDB: // DQT - define quantization table - L = get16()-2; - while (L > 0) { - int z = get8(); - int p = z >> 4; - int t = z & 15,i; - if (p != 0) return e("bad DQT type","Corrupt JPEG"); - if (t > 3) return e("bad DQT table","Corrupt JPEG"); - for (i=0; i < 64; ++i) - dequant[t][dezigzag[i]] = get8u(); - L -= 65; - } - return L==0; - - case 0xC4: // DHT - define huffman table - L = get16()-2; - while (L > 0) { - uint8 *v; - int sizes[16],i,m=0; - int z = get8(); - int tc = z >> 4; - int th = z & 15; - if (tc > 1 || th > 3) return e("bad DHT header","Corrupt JPEG"); - for (i=0; i < 16; ++i) { - sizes[i] = get8(); - m += sizes[i]; - } - L -= 17; - if (tc == 0) { - if (!build_huffman(huff_dc+th, sizes)) return 0; - v = huff_dc[th].values; - } else { - if (!build_huffman(huff_ac+th, sizes)) return 0; - v = huff_ac[th].values; - } - for (i=0; i < m; ++i) - v[i] = get8u(); - L -= m; - } - return L==0; - } - // check for comment block or APP blocks - if ((m >= 0xE0 && m <= 0xEF) || m == 0xFE) { - skip(get16()-2); - return 1; - } - return 0; -} - -// after we see SOS -static int process_scan_header(void) -{ - int i; - int Ls = get16(); - scan_n = get8(); - if (scan_n < 1 || scan_n > 4 || scan_n > (int) img_n) return e("bad SOS component count","Corrupt JPEG"); - if (Ls != 6+2*scan_n) return e("bad SOS len","Corrupt JPEG"); - for (i=0; i < scan_n; ++i) { - int id = get8(), which; - int z = get8(); - for (which = 0; which < img_n; ++which) - if (img_comp[which].id == id) - break; - if (which == img_n) return 0; - img_comp[which].hd = z >> 4; if (img_comp[which].hd > 3) return e("bad DC huff","Corrupt JPEG"); - img_comp[which].ha = z & 15; if (img_comp[which].ha > 3) return e("bad AC huff","Corrupt JPEG"); - order[i] = which; - } - if (get8() != 0) return e("bad SOS","Corrupt JPEG"); - get8(); // should be 63, but might be 0 - if (get8() != 0) return e("bad SOS","Corrupt JPEG"); - - return 1; -} - -static int process_frame_header(int scan) -{ - int Lf,p,i,z, h_max=1,v_max=1; - Lf = get16(); if (Lf < 11) return e("bad SOF len","Corrupt JPEG"); // JPEG - p = get8(); if (p != 8) return e("only 8-bit","JPEG format not supported: 8-bit only"); // JPEG baseline - img_y = get16(); if (img_y == 0) return e("no header height", "JPEG format not supported: delayed height"); // Legal, but we don't handle it--but neither does IJG - img_x = get16(); if (img_x == 0) return e("0 width","Corrupt JPEG"); // JPEG requires - img_n = get8(); - if (img_n != 3 && img_n != 1) return e("bad component count","Corrupt JPEG"); // JFIF requires - - if (Lf != 8+3*img_n) return e("bad SOF len","Corrupt JPEG"); - - for (i=0; i < img_n; ++i) { - img_comp[i].id = get8(); - if (img_comp[i].id != i+1) // JFIF requires - if (img_comp[i].id != i) // jpegtran outputs non-JFIF-compliant files! - return e("bad component ID","Corrupt JPEG"); - z = get8(); - img_comp[i].h = (z >> 4); if (!img_comp[i].h || img_comp[i].h > 4) return e("bad H","Corrupt JPEG"); - img_comp[i].v = z & 15; if (!img_comp[i].v || img_comp[i].v > 4) return e("bad V","Corrupt JPEG"); - img_comp[i].tq = get8(); if (img_comp[i].tq > 3) return e("bad TQ","Corrupt JPEG"); - } - - if (scan != SCAN_load) return 1; - - if ((1 << 30) / img_x / img_n < img_y) return e("too large", "Image too large to decode"); - - for (i=0; i < img_n; ++i) { - if (img_comp[i].h > h_max) h_max = img_comp[i].h; - if (img_comp[i].v > v_max) v_max = img_comp[i].v; - } - - // compute interleaved mcu info - img_h_max = h_max; - img_v_max = v_max; - img_mcu_w = h_max * 8; - img_mcu_h = v_max * 8; - img_mcu_x = (img_x + img_mcu_w-1) / img_mcu_w; - img_mcu_y = (img_y + img_mcu_h-1) / img_mcu_h; - - for (i=0; i < img_n; ++i) { - // number of effective pixels (e.g. for non-interleaved MCU) - img_comp[i].x = (img_x * img_comp[i].h + h_max-1) / h_max; - img_comp[i].y = (img_y * img_comp[i].v + v_max-1) / v_max; - // to simplify generation, we'll allocate enough memory to decode - // the bogus oversized data from using interleaved MCUs and their - // big blocks (e.g. a 16x16 iMCU on an image of width 33); we won't - // discard the extra data until colorspace conversion - img_comp[i].w2 = img_mcu_x * img_comp[i].h * 8; - img_comp[i].h2 = img_mcu_y * img_comp[i].v * 8; - img_comp[i].data = (uint8 *) malloc(img_comp[i].w2 * img_comp[i].h2); - if (img_comp[i].data == NULL) { - for(--i; i >= 0; --i) - free(img_comp[i].data); - return e("outofmem", "Out of memory"); - } - } - - return 1; -} - -// use comparisons since in some cases we handle more than one case (e.g. SOF) -#define DNL(x) ((x) == 0xdc) -#define SOI(x) ((x) == 0xd8) -#define EOI(x) ((x) == 0xd9) -#define SOF(x) ((x) == 0xc0 || (x) == 0xc1) -#define SOS(x) ((x) == 0xda) - -static int decode_jpeg_header(int scan) -{ - int m; - marker = MARKER_none; // initialize cached marker to empty - m = get_marker(); - if (!SOI(m)) return e("no SOI","Corrupt JPEG"); - if (scan == SCAN_type) return 1; - m = get_marker(); - while (!SOF(m)) { - if (!process_marker(m)) return 0; - m = get_marker(); - while (m == MARKER_none) { - // some files have extra padding after their blocks, so ok, we'll scan - if (at_eof()) return e("no SOF", "Corrupt JPEG"); - m = get_marker(); - } - } - if (!process_frame_header(scan)) return 0; - return 1; -} - -static int decode_jpeg_image(void) -{ - int m; - restart_interval = 0; - if (!decode_jpeg_header(SCAN_load)) return 0; - m = get_marker(); - while (!EOI(m)) { - if (SOS(m)) { - if (!process_scan_header()) return 0; - if (!parse_entropy_coded_data()) return 0; - } else { - if (!process_marker(m)) return 0; - } - m = get_marker(); - } - return 1; -} - -// static jfif-centered resampling with cross-block smoothing -// here by cross-block smoothing what I mean is that the resampling -// is bilerp and crosses blocks; I dunno what IJG means - -#define div4(x) ((uint8) ((x) >> 2)) - -static void resample_v_2(uint8 *out1, uint8 *input, int w, int h, int s) -{ - // need to generate two samples vertically for every one in input - uint8 *above; - uint8 *below; - uint8 *source; - uint8 *out2; - int i,j; - source = input; - out2 = out1+w; - for (j=0; j < h; ++j) { - above = source; - source = input + j*s; - below = source + s; if (j == h-1) below = source; - for (i=0; i < w; ++i) { - int n = source[i]*3; - out1[i] = div4(above[i] + n); - out2[i] = div4(below[i] + n); - } - out1 += w*2; - out2 += w*2; - } -} - -static void resample_h_2(uint8 *out, uint8 *input, int w, int h, int s) -{ - // need to generate two samples horizontally for every one in input - int i,j; - if (w == 1) { - for (j=0; j < h; ++j) - out[j*2+0] = out[j*2+1] = input[j*s]; - return; - } - for (j=0; j < h; ++j) { - out[0] = input[0]; - out[1] = div4(input[0]*3 + input[1]); - for (i=1; i < w-1; ++i) { - int n = input[i]*3; - out[i*2-2] = div4(input[i-1] + n); - out[i*2-1] = div4(input[i+1] + n); - } - out[w*2-2] = div4(input[w-2]*3 + input[w-1]); - out[w*2-1] = input[w-1]; - out += w*2; - input += s; - } -} - -// .172 seconds on 3*anemones.jpg -static void resample_hv_2(uint8 *out, uint8 *input, int w, int h, int s) -{ - // need to generate 2x2 samples for every one in input - int i,j; - int os = w*2; - // generate edge samples... @TODO lerp them! - for (i=0; i < w; ++i) { - out[i*2+0] = out[i*2+1] = input[i]; - out[i*2+(2*h-1)*os+0] = out[i*2+(2*h-1)*os+1] = input[i+(h-1)*w]; - } - for (j=0; j < h; ++j) { - out[j*os*2+0] = out[j*os*2+os+0] = input[j*w]; - out[j*os*2+os-1] = out[j*os*2+os+os-1] = input[j*w+i-1]; - } - // now generate interior samples; i & j point to top left of input - for (j=0; j < h-1; ++j) { - uint8 *in1 = input+j*s; - uint8 *in2 = in1 + s; - uint8 *out1 = out + (j*2+1)*os + 1; - uint8 *out2 = out1 + os; - for (i=0; i < w-1; ++i) { - int p00 = in1[0], p01=in1[1], p10=in2[0], p11=in2[1]; - int p00_3 = p00*3, p01_3 = p01*3, p10_3 = p10*3, p11_3 = p11*3; - - #define div16(x) ((uint8) ((x) >> 4)) - - out1[0] = div16(p00*9 + p01_3 + p10_3 + p11); - out1[1] = div16(p01*9 + p00_3 + p01_3 + p10); - out2[0] = div16(p10*9 + p11_3 + p00_3 + p01); - out2[1] = div16(p11*9 + p10_3 + p01_3 + p00); - out1 += 2; - out2 += 2; - ++in1; - ++in2; - } - } -} - -#define float2fixed(x) ((int) ((x) * 65536 + 0.5)) - -// 0.38 seconds on 3*anemones.jpg (0.25 with processor = Pro) -// VC6 without processor=Pro is generating multiple LEAs per multiply! -static void YCbCr_to_RGB_row(uint8 *out, uint8 *y, uint8 *pcb, uint8 *pcr, int count, int step) -{ - int i; - for (i=0; i < count; ++i) { - int y_fixed = (y[i] << 16) + 32768; // rounding - int r,g,b; - int cr = pcr[i] - 128; - int cb = pcb[i] - 128; - r = y_fixed + cr*float2fixed(1.40200f); - g = y_fixed - cr*float2fixed(0.71414f) - cb*float2fixed(0.34414f); - b = y_fixed + cb*float2fixed(1.77200f); - r >>= 16; - g >>= 16; - b >>= 16; - if ((unsigned) r > 255) { if (r < 0) r = 0; else r = 255; } - if ((unsigned) g > 255) { if (g < 0) g = 0; else g = 255; } - if ((unsigned) b > 255) { if (b < 0) b = 0; else b = 255; } - out[0] = (uint8)r; - out[1] = (uint8)g; - out[2] = (uint8)b; - if (step == 4) out[3] = 255; - out += step; - } -} - -// clean up the temporary component buffers -static void cleanup_jpeg(void) -{ - int i; - for (i=0; i < img_n; ++i) { - if (img_comp[i].data) { - free(img_comp[i].data); - img_comp[i].data = NULL; - } - } -} - -static uint8 *load_jpeg_image(int *out_x, int *out_y, int *comp, int req_comp) -{ - int i, n; - // validate req_comp - if (req_comp < 0 || req_comp > 4) return ep("bad req_comp", "Internal error"); - - // load a jpeg image from whichever source - if (!decode_jpeg_image()) { cleanup_jpeg(); return NULL; } - - // determine actual number of components to generate - n = req_comp ? req_comp : img_n; - - // resample components to full size... memory wasteful, but this - // lets us bilerp across blocks while upsampling - for (i=0; i < img_n; ++i) { - // if we're outputting fewer than 3 components, we're grey not RGB; - // in that case, don't bother upsampling Cb or Cr - if (n < 3 && i) continue; - - // check if the component scale is less than max; if so it needs upsampling - if (img_comp[i].h != img_h_max || img_comp[i].v != img_v_max) { - int stride = img_x; - // allocate final size; make sure it's big enough for upsampling off - // the edges with upsample up to 4x4 (although we only support 2x2 - // currently) - uint8 *new_data = (uint8 *) malloc((img_x+3)*(img_y+3)); - if (new_data == NULL) { - cleanup_jpeg(); - return ep("outofmem", "Out of memory (image too large?)"); - } - if (img_comp[i].h*2 == img_h_max && img_comp[i].v*2 == img_v_max) { - int tx = (img_x+1)>>1; - resample_hv_2(new_data, img_comp[i].data, tx,(img_y+1)>>1, img_comp[i].w2); - stride = tx*2; - } else if (img_comp[i].h == img_h_max && img_comp[i].v*2 == img_v_max) { - resample_v_2(new_data, img_comp[i].data, img_x,(img_y+1)>>1, img_comp[i].w2); - } else if (img_comp[i].h*2 == img_h_max && img_comp[i].v == img_v_max) { - int tx = (img_x+1)>>1; - resample_h_2(new_data, img_comp[i].data, tx,img_y, img_comp[i].w2); - stride = tx*2; - } else { - // @TODO resample uncommon sampling pattern with nearest neighbor - free(new_data); - cleanup_jpeg(); - return ep("uncommon H or V", "JPEG not supported: atypical downsampling mode"); - } - img_comp[i].w2 = stride; - free(img_comp[i].data); - img_comp[i].data = new_data; - } - } - - // now convert components to output image - { - uint32 i,j; - uint8 *output = (uint8 *) malloc(n * img_x * img_y + 1); - if (n >= 3) { // output STBI_rgb_* - for (j=0; j < img_y; ++j) { - uint8 *y = img_comp[0].data + j*img_comp[0].w2; - uint8 *out = output + n * img_x * j; - if (img_n == 3) { - uint8 *cb = img_comp[1].data + j*img_comp[1].w2; - uint8 *cr = img_comp[2].data + j*img_comp[2].w2; - YCbCr_to_RGB_row(out, y, cb, cr, img_x, n); - } else { - for (i=0; i < img_x; ++i) { - out[0] = out[1] = out[2] = y[i]; - out[3] = 255; // not used if n == 3 - out += n; - } - } - } - } else { // output STBI_grey_* - for (j=0; j < img_y; ++j) { - uint8 *y = img_comp[0].data + j*img_comp[0].w2; - uint8 *out = output + n * img_x * j; - if (n == 1) - for (i=0; i < img_x; ++i) *out++ = *y++; - else - for (i=0; i < img_x; ++i) *out++ = *y++, *out++ = 255; - } - } - cleanup_jpeg(); - *out_x = img_x; - *out_y = img_y; - if (comp) *comp = img_n; // report original components, not output - return output; - } -} - -#ifndef STBI_NO_STDIO -unsigned char *stbi_jpeg_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp) -{ - start_file(f); - return load_jpeg_image(x,y,comp,req_comp); -} - -unsigned char *stbi_jpeg_load(char *filename, int *x, int *y, int *comp, int req_comp) -{ - unsigned char *data; - FILE *f = fopen(filename, "rb"); - if (!f) return NULL; - data = stbi_jpeg_load_from_file(f,x,y,comp,req_comp); - fclose(f); - return data; -} -#endif - -unsigned char *stbi_jpeg_load_from_memory(stbi_uc *buffer, int len, int *x, int *y, int *comp, int req_comp) -{ - start_mem(buffer,len); - return load_jpeg_image(x,y,comp,req_comp); -} - -#ifndef STBI_NO_STDIO -int stbi_jpeg_test_file(FILE *f) -{ - int n,r; - n = ftell(f); - start_file(f); - r = decode_jpeg_header(SCAN_type); - fseek(f,n,SEEK_SET); - return r; -} -#endif - -int stbi_jpeg_test_memory(unsigned char *buffer, int len) -{ - start_mem(buffer,len); - return decode_jpeg_header(SCAN_type); -} - -// @TODO: -extern int stbi_jpeg_info (char *filename, int *x, int *y, int *comp); -extern int stbi_jpeg_info_from_file (FILE *f, int *x, int *y, int *comp); -extern int stbi_jpeg_info_from_memory(stbi_uc *buffer, int len, int *x, int *y, int *comp); - -// public domain zlib decode v0.2 Sean Barrett 2006-11-18 -// simple implementation -// - all input must be provided in an upfront buffer -// - all output is written to a single output buffer (can malloc/realloc) -// performance -// - fast huffman - -// fast-way is faster to check than jpeg huffman, but slow way is slower -#define ZFAST_BITS 9 // accelerate all cases in default tables -#define ZFAST_MASK ((1 << ZFAST_BITS) - 1) - -// zlib-style huffman encoding -// (jpegs packs from left, zlib from right, so can't share code) -typedef struct -{ - uint16 fast[1 << ZFAST_BITS]; - uint16 firstcode[16]; - int maxcode[17]; - uint16 firstsymbol[16]; - uint8 size[288]; - uint16 value[288]; -} zhuffman; - -__forceinline static int bitreverse16(int n) -{ - n = ((n & 0xAAAA) >> 1) | ((n & 0x5555) << 1); - n = ((n & 0xCCCC) >> 2) | ((n & 0x3333) << 2); - n = ((n & 0xF0F0) >> 4) | ((n & 0x0F0F) << 4); - n = ((n & 0xFF00) >> 8) | ((n & 0x00FF) << 8); - return n; -} - -__forceinline static int bit_reverse(int v, int bits) -{ - assert(bits <= 16); - // to bit reverse n bits, reverse 16 and shift - // e.g. 11 bits, bit reverse and shift away 5 - return bitreverse16(v) >> (16-bits); -} - -static int zbuild_huffman(zhuffman *z, uint8 *sizelist, int num) -{ - int i,k=0; - int code, next_code[16], sizes[17]; - - // DEFLATE spec for generating codes - memset(sizes, 0, sizeof(sizes)); - memset(z->fast, 255, sizeof(z->fast)); - for (i=0; i < num; ++i) - ++sizes[sizelist[i]]; - sizes[0] = 0; - for (i=1; i < 16; ++i) - assert(sizes[i] <= (1 << i)); - code = 0; - for (i=1; i < 16; ++i) { - next_code[i] = code; - z->firstcode[i] = (uint16) code; - z->firstsymbol[i] = (uint16) k; - code = (code + sizes[i]); - if (sizes[i]) - if (code-1 >= (1 << i)) return e("bad codelengths","Corrupt JPEG"); - z->maxcode[i] = code << (16-i); // preshift for inner loop - code <<= 1; - k += sizes[i]; - } - z->maxcode[16] = 0x10000; // sentinel - for (i=0; i < num; ++i) { - int s = sizelist[i]; - if (s) { - int c = next_code[s] - z->firstcode[s] + z->firstsymbol[s]; - z->size[c] = (uint8)s; - z->value[c] = (uint16)i; - if (s <= ZFAST_BITS) { - int k = bit_reverse(next_code[s],s); - while (k < (1 << ZFAST_BITS)) { - z->fast[k] = (uint16) c; - k += (1 << s); - } - } - ++next_code[s]; - } - } - return 1; -} - -// zlib-from-memory implementation for PNG reading -// because PNG allows splitting the zlib stream arbitrarily, -// and it's annoying structurally to have PNG call ZLIB call PNG, -// we require PNG read all the IDATs and combine them into a single -// memory buffer - -static uint8 *zbuffer, *zbuffer_end; - -__forceinline static int zget8(void) -{ - if (zbuffer >= zbuffer_end) return 0; - return *zbuffer++; -} - -//static unsigned long code_buffer; -static int num_bits; - -static void fill_bits(void) -{ - do { - assert(code_buffer < (1U << num_bits)); - code_buffer |= zget8() << num_bits; - num_bits += 8; - } while (num_bits <= 24); -} - -__forceinline static unsigned int zreceive(int n) -{ - unsigned int k; - if (num_bits < n) fill_bits(); - k = code_buffer & ((1 << n) - 1); - code_buffer >>= n; - num_bits -= n; - return k; -} - -__forceinline static int zhuffman_decode(zhuffman *z) -{ - int b,s,k; - if (num_bits < 16) fill_bits(); - b = z->fast[code_buffer & ZFAST_MASK]; - if (b < 0xffff) { - s = z->size[b]; - code_buffer >>= s; - num_bits -= s; - return z->value[b]; - } - - // not resolved by fast table, so compute it the slow way - // use jpeg approach, which requires MSbits at top - k = bit_reverse(code_buffer, 16); - for (s=ZFAST_BITS+1; ; ++s) - if (k < z->maxcode[s]) - break; - if (s == 16) return -1; // invalid code! - // code size is s, so: - b = (k >> (16-s)) - z->firstcode[s] + z->firstsymbol[s]; - assert(z->size[b] == s); - code_buffer >>= s; - num_bits -= s; - return z->value[b]; -} - -static char *zout; -static char *zout_start; -static char *zout_end; -static int z_expandable; - -static int expand(int n) // need to make room for n bytes -{ - char *q; - int cur, limit; - if (!z_expandable) return e("output buffer limit","Corrupt PNG"); - cur = (int) (zout - zout_start); - limit = (int) (zout_end - zout_start); - while (cur + n > limit) - limit *= 2; - q = (char *) realloc(zout_start, limit); - if (q == NULL) return e("outofmem", "Out of memory"); - zout_start = q; - zout = q + cur; - zout_end = q + limit; - return 1; -} - -static zhuffman z_length, z_distance; - -static int length_base[31] = { - 3,4,5,6,7,8,9,10,11,13, - 15,17,19,23,27,31,35,43,51,59, - 67,83,99,115,131,163,195,227,258,0,0 }; - -static int length_extra[31]= -{ 0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,0,0,0 }; - -static int dist_base[32] = { 1,2,3,4,5,7,9,13,17,25,33,49,65,97,129,193, -257,385,513,769,1025,1537,2049,3073,4097,6145,8193,12289,16385,24577,0,0}; - -static int dist_extra[32] = -{ 0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13}; - -static int parse_huffman_block(void) -{ - for(;;) { - int z = zhuffman_decode(&z_length); - if (z < 256) { - if (z < 0) return e("bad huffman code","Corrupt PNG"); // error in huffman codes - if (zout >= zout_end) if (!expand(1)) return 0; - *zout++ = (char) z; - } else { - uint8 *p; - int len,dist; - if (z == 256) return 1; - z -= 257; - len = length_base[z]; - if (length_extra[z]) len += zreceive(length_extra[z]); - z = zhuffman_decode(&z_distance); - if (z < 0) return e("bad huffman code","Corrupt PNG"); - dist = dist_base[z]; - if (dist_extra[z]) dist += zreceive(dist_extra[z]); - if (zout - zout_start < dist) return e("bad dist","Corrupt PNG"); - if (zout + len > zout_end) if (!expand(len)) return 0; - p = (uint8 *) (zout - dist); - while (len--) - *zout++ = *p++; - } - } -} - -static int compute_huffman_codes(void) -{ - static uint8 length_dezigzag[19] = { 16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15 }; - static zhuffman z_codelength; // static just to save stack space - uint8 lencodes[286+32+137];//padding for maximum single op - uint8 codelength_sizes[19]; - int i,n; - - int hlit = zreceive(5) + 257; - int hdist = zreceive(5) + 1; - int hclen = zreceive(4) + 4; - - memset(codelength_sizes, 0, sizeof(codelength_sizes)); - for (i=0; i < hclen; ++i) { - int s = zreceive(3); - codelength_sizes[length_dezigzag[i]] = (uint8) s; - } - if (!zbuild_huffman(&z_codelength, codelength_sizes, 19)) return 0; - - n = 0; - while (n < hlit + hdist) { - int c = zhuffman_decode(&z_codelength); - assert(c >= 0 && c < 19); - if (c < 16) - lencodes[n++] = (uint8) c; - else if (c == 16) { - c = zreceive(2)+3; - memset(lencodes+n, lencodes[n-1], c); - n += c; - } else if (c == 17) { - c = zreceive(3)+3; - memset(lencodes+n, 0, c); - n += c; - } else { - assert(c == 18); - c = zreceive(7)+11; - memset(lencodes+n, 0, c); - n += c; - } - } - if (n != hlit+hdist) return e("bad codelengths","Corrupt PNG"); - if (!zbuild_huffman(&z_length, lencodes, hlit)) return 0; - if (!zbuild_huffman(&z_distance, lencodes+hlit, hdist)) return 0; - return 1; -} - -static int parse_uncompressed_block(void) -{ - uint8 header[4]; - int len,nlen,k; - if (num_bits & 7) - zreceive(num_bits & 7); // discard - // drain the bit-packed data into header - k = 0; - while (num_bits > 0) { - header[k++] = (uint8) (code_buffer & 255); // wtf this warns? - code_buffer >>= 8; - num_bits -= 8; - } - assert(num_bits == 0); - // now fill header the normal way - while (k < 4) - header[k++] = (uint8) zget8(); - len = header[1] * 256 + header[0]; - nlen = header[3] * 256 + header[2]; - if (nlen != (len ^ 0xffff)) return e("zlib corrupt","Corrupt PNG"); - if (zbuffer + len > zbuffer_end) return e("read past buffer","Corrupt PNG"); - if (zout + len > zout_end) - if (!expand(len)) return 0; - memcpy(zout, zbuffer, len); - zbuffer += len; - zout += len; - return 1; -} - -static int parse_zlib_header(void) -{ - int cmf = zget8(); - int cm = cmf & 15; - /* int cinfo = cmf >> 4; */ - int flg = zget8(); - if ((cmf*256+flg) % 31 != 0) return e("bad zlib header","Corrupt PNG"); // zlib spec - if (flg & 32) return e("no preset dict","Corrupt PNG"); // preset dictionary not allowed in png - if (cm != 8) return e("bad compression","Corrupt PNG"); // DEFLATE required for png - // window = 1 << (8 + cinfo)... but who cares, we fully buffer output - return 1; -} - -static uint8 default_length[288], default_distance[32]; -static void init_defaults(void) -{ - int i; // use <= to match clearly with spec - for (i=0; i <= 143; ++i) default_length[i] = 8; - for ( ; i <= 255; ++i) default_length[i] = 9; - for ( ; i <= 279; ++i) default_length[i] = 7; - for ( ; i <= 287; ++i) default_length[i] = 8; - - for (i=0; i <= 31; ++i) default_distance[i] = 5; -} - -static int parse_zlib(int parse_header) -{ - int final, type; - if (parse_header) - if (!parse_zlib_header()) return 0; - num_bits = 0; - code_buffer = 0; - do { - final = zreceive(1); - type = zreceive(2); - if (type == 0) { - if (!parse_uncompressed_block()) return 0; - } else if (type == 3) { - return 0; - } else { - if (type == 1) { - // use fixed code lengths - if (!default_length[0]) init_defaults(); - if (!zbuild_huffman(&z_length , default_length , 288)) return 0; - if (!zbuild_huffman(&z_distance, default_distance, 32)) return 0; - } else { - if (!compute_huffman_codes()) return 0; - } - if (!parse_huffman_block()) return 0; - } - } while (!final); - return 1; -} - -static int do_zlib(char *obuf, int olen, int exp, int parse_header) -{ - zout_start = obuf; - zout = obuf; - zout_end = obuf + olen; - z_expandable = exp; - - return parse_zlib(parse_header); -} - -char *stbi_zlib_decode_malloc_guesssize(int initial_size, int *outlen) -{ - char *p = (char *) malloc(initial_size); - if (p == NULL) return NULL; - if (do_zlib(p, initial_size, 1, 1)) { - *outlen = (int) (zout - zout_start); - return zout_start; - } else { - free(zout_start); - return NULL; - } -} - -char *stbi_zlib_decode_malloc(char *buffer, int len, int *outlen) -{ - zbuffer = (uint8 *) buffer; - zbuffer_end = (uint8 *) buffer+len; - return stbi_zlib_decode_malloc_guesssize(16384, outlen); -} - -int stbi_zlib_decode_buffer(char *obuffer, int olen, char *ibuffer, int ilen) -{ - zbuffer = (uint8 *) ibuffer; - zbuffer_end = (uint8 *) ibuffer + ilen; - if (do_zlib(obuffer, olen, 0, 1)) - return (int) (zout - zout_start); - else - return -1; -} - -char *stbi_zlib_decode_noheader_malloc(char *buffer, int len, int *outlen) -{ - char *p = (char *) malloc(16384); - if (p == NULL) return NULL; - zbuffer = (uint8 *) buffer; - zbuffer_end = (uint8 *) buffer+len; - if (do_zlib(p, 16384, 1, 0)) { - *outlen = (int) (zout - zout_start); - return zout_start; - } else { - free(zout_start); - return NULL; - } -} - -int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, char *ibuffer, int ilen) -{ - zbuffer = (uint8 *) ibuffer; - zbuffer_end = (uint8 *) ibuffer + ilen; - if (do_zlib(obuffer, olen, 0, 0)) - return (int) (zout - zout_start); - else - return -1; -} - -// public domain "baseline" PNG decoder v0.10 Sean Barrett 2006-11-18 -// simple implementation -// - only 8-bit samples -// - no CRC checking -// - allocates lots of intermediate memory -// - avoids problem of streaming data between subsystems -// - avoids explicit window management -// performance -// - uses stb_zlib, a PD zlib implementation with fast huffman decoding - - -typedef struct -{ - unsigned long length; - unsigned long type; -} chunk; - -#define PNG_TYPE(a,b,c,d) (((a) << 24) + ((b) << 16) + ((c) << 8) + (d)) - -static chunk get_chunk_header(void) -{ - chunk c; - c.length = get32(); - c.type = get32(); - return c; -} - -static int check_png_header(void) -{ - static uint8 png_sig[8] = { 137,80,78,71,13,10,26,10 }; - int i; - for (i=0; i < 8; ++i) - if (get8() != png_sig[i]) return e("bad png sig","Not a PNG"); - return 1; -} - -static uint8 *idata, *expanded, *out; - -enum { - F_none=0, F_sub=1, F_up=2, F_avg=3, F_paeth=4, - F_avg_first, F_paeth_first, -}; - -static uint8 first_row_filter[5] = -{ - F_none, F_sub, F_none, F_avg_first, F_paeth_first -}; - -static int paeth(int a, int b, int c) -{ - int p = a + b - c; - int pa = abs(p-a); - int pb = abs(p-b); - int pc = abs(p-c); - if (pa <= pb && pa <= pc) return a; - if (pb <= pc) return b; - return c; -} - -// create the png data from post-deflated data -static int create_png_image(uint8 *raw, uint32 raw_len, int out_n) -{ - uint32 i,j,stride = img_x*out_n; - int k; - assert(out_n == img_n || out_n == img_n+1); - out = (uint8 *) malloc(img_x * img_y * out_n); - if (!out) return e("outofmem", "Out of memory"); - if (raw_len != (img_n * img_x + 1) * img_y) return e("not enough pixels","Corrupt PNG"); - for (j=0; j < img_y; ++j) { - uint8 *cur = out + stride*j; - uint8 *prior = cur - stride; - int filter = *raw++; - if (filter > 4) return e("invalid filter","Corrupt PNG"); - // if first row, use special filter that doesn't sample previous row - if (j == 0) filter = first_row_filter[filter]; - // handle first pixel explicitly - for (k=0; k < img_n; ++k) { - switch(filter) { - case F_none : cur[k] = raw[k]; break; - case F_sub : cur[k] = raw[k]; break; - case F_up : cur[k] = raw[k] + prior[k]; break; - case F_avg : cur[k] = raw[k] + (prior[k]>>1); break; - case F_paeth : cur[k] = (uint8) (raw[k] + paeth(0,prior[k],0)); break; - case F_avg_first : cur[k] = raw[k]; break; - case F_paeth_first: cur[k] = raw[k]; break; - } - } - if (img_n != out_n) cur[img_n] = 255; - raw += img_n; - cur += out_n; - prior += out_n; - // this is a little gross, so that we don't switch per-pixel or per-component - if (img_n == out_n) { - #define CASE(f) \ - case f: \ - for (i=1; i < img_x; ++i, raw+=img_n,cur+=img_n,prior+=img_n) \ - for (k=0; k < img_n; ++k) - switch(filter) { - CASE(F_none) cur[k] = raw[k]; break; - CASE(F_sub) cur[k] = raw[k] + cur[k-img_n]; break; - CASE(F_up) cur[k] = raw[k] + prior[k]; break; - CASE(F_avg) cur[k] = raw[k] + ((prior[k] + cur[k-img_n])>>1); break; - CASE(F_paeth) cur[k] = (uint8) (raw[k] + paeth(cur[k-img_n],prior[k],prior[k-img_n])); break; - CASE(F_avg_first) cur[k] = raw[k] + (cur[k-img_n] >> 1); break; - CASE(F_paeth_first) cur[k] = (uint8) (raw[k] + paeth(cur[k-img_n],0,0)); break; - } - #undef CASE - } else { - assert(img_n+1 == out_n); - #define CASE(f) \ - case f: \ - for (i=1; i < img_x; ++i, cur[img_n]=255,raw+=img_n,cur+=out_n,prior+=out_n) \ - for (k=0; k < img_n; ++k) - switch(filter) { - CASE(F_none) cur[k] = raw[k]; break; - CASE(F_sub) cur[k] = raw[k] + cur[k-out_n]; break; - CASE(F_up) cur[k] = raw[k] + prior[k]; break; - CASE(F_avg) cur[k] = raw[k] + ((prior[k] + cur[k-out_n])>>1); break; - CASE(F_paeth) cur[k] = (uint8) (raw[k] + paeth(cur[k-out_n],prior[k],prior[k-out_n])); break; - CASE(F_avg_first) cur[k] = raw[k] + (cur[k-out_n] >> 1); break; - CASE(F_paeth_first) cur[k] = (uint8) (raw[k] + paeth(cur[k-out_n],0,0)); break; - } - #undef CASE - } - } - return 1; -} - -static int compute_transparency(uint8 tc[3], int out_n) -{ - uint32 i, pixel_count = img_x * img_y; - uint8 *p = out; - - // compute color-based transparency, assuming we've - // already got 255 as the alpha value in the output - assert(out_n == 2 || out_n == 4); - - p = out; - if (out_n == 2) { - for (i=0; i < pixel_count; ++i) { - p[1] = (p[0] == tc[0] ? 0 : 255); - p += 2; - } - } else { - for (i=0; i < pixel_count; ++i) { - if (p[0] == tc[0] && p[1] == tc[1] && p[2] == tc[2]) - p[3] = 0; - p += 4; - } - } - return 1; -} - -static int expand_palette(uint8 *palette, int len, int pal_img_n) -{ - uint32 i, pixel_count = img_x * img_y; - uint8 *p, *temp_out, *orig = out; - - p = (uint8 *) malloc(pixel_count * pal_img_n); - if (p == NULL) return e("outofmem", "Out of memory"); - - // between here and free(out) below, exitting would leak - temp_out = p; - - if (pal_img_n == 3) { - for (i=0; i < pixel_count; ++i) { - int n = orig[i]*4; - p[0] = palette[n ]; - p[1] = palette[n+1]; - p[2] = palette[n+2]; - p += 3; - } - } else { - for (i=0; i < pixel_count; ++i) { - int n = orig[i]*4; - p[0] = palette[n ]; - p[1] = palette[n+1]; - p[2] = palette[n+2]; - p[3] = palette[n+3]; - p += 4; - } - } - free(out); - out = temp_out; - return 1; -} - -static int parse_png_file(int scan, int req_comp) -{ - uint8 palette[1024], pal_img_n=0; - uint8 has_trans=0, tc[3]; - uint32 ioff=0, idata_limit=0, i, pal_len=0; - int first=1,k; - - if (!check_png_header()) return 0; - - if (scan == SCAN_type) return 1; - - for(;;first=0) { - chunk c = get_chunk_header(); - if (first && c.type != PNG_TYPE('I','H','D','R')) - return e("first not IHDR","Corrupt PNG"); - switch (c.type) { - case PNG_TYPE('I','H','D','R'): { - int depth,color,interlace,comp,filter; - if (!first) return e("multiple IHDR","Corrupt PNG"); - if (c.length != 13) return e("bad IHDR len","Corrupt PNG"); - img_x = get32(); if (img_x > (1 << 24)) return e("too large","Very large image (corrupt?)"); - img_y = get32(); if (img_y > (1 << 24)) return e("too large","Very large image (corrupt?)"); - depth = get8(); if (depth != 8) return e("8bit only","PNG not supported: 8-bit only"); - color = get8(); if (color > 6) return e("bad ctype","Corrupt PNG"); - if (color == 3) pal_img_n = 3; else if (color & 1) return e("bad ctype","Corrupt PNG"); - comp = get8(); if (comp) return e("bad comp method","Corrupt PNG"); - filter= get8(); if (filter) return e("bad filter method","Corrupt PNG"); - interlace = get8(); if (interlace) return e("interlaced","PNG not supported: interlaced mode"); - if (!img_x || !img_y) return e("0-pixel image","Corrupt PNG"); - if (!pal_img_n) { - img_n = (color & 2 ? 3 : 1) + (color & 4 ? 1 : 0); - if ((1 << 30) / img_x / img_n < img_y) return e("too large", "Image too large to decode"); - if (scan == SCAN_header) return 1; - } else { - // if paletted, then pal_n is our final components, and - // img_n is # components to decompress/filter. - img_n = 1; - if ((1 << 30) / img_x / 4 < img_y) return e("too large","Corrupt PNG"); - // if SCAN_header, have to scan to see if we have a tRNS - } - break; - } - - case PNG_TYPE('P','L','T','E'): { - if (c.length > 256*3) return e("invalid PLTE","Corrupt PNG"); - pal_len = c.length / 3; - if (pal_len * 3 != c.length) return e("invalid PLTE","Corrupt PNG"); - for (i=0; i < pal_len; ++i) { - palette[i*4+0] = get8u(); - palette[i*4+1] = get8u(); - palette[i*4+2] = get8u(); - palette[i*4+3] = 255; - } - break; - } - - case PNG_TYPE('t','R','N','S'): { - if (idata) return e("tRNS after IDAT","Corrupt PNG"); - if (pal_img_n) { - if (scan == SCAN_header) { img_n = 4; return 1; } - if (pal_len == 0) return e("tRNS before PLTE","Corrupt PNG"); - if (c.length > pal_len) return e("bad tRNS len","Corrupt PNG"); - pal_img_n = 4; - for (i=0; i < c.length; ++i) - palette[i*4+3] = get8u(); - } else { - if (!(img_n & 1)) return e("tRNS with alpha","Corrupt PNG"); - if (c.length != (uint32) img_n*2) return e("bad tRNS len","Corrupt PNG"); - has_trans = 1; - for (k=0; k < img_n; ++k) - tc[k] = (uint8) get16(); // non 8-bit images will be larger - } - break; - } - - case PNG_TYPE('I','D','A','T'): { - if (pal_img_n && !pal_len) return e("no PLTE","Corrupt PNG"); - if (scan == SCAN_header) { img_n = pal_img_n; return 1; } - if (ioff + c.length > idata_limit) { - uint8 *p; - if (idata_limit == 0) idata_limit = c.length > 4096 ? c.length : 4096; - while (ioff + c.length > idata_limit) - idata_limit *= 2; - p = (uint8 *) realloc(idata, idata_limit); if (p == NULL) return e("outofmem", "Out of memory"); - idata = p; - } - #ifndef STBI_NO_STDIO - if (img_file) - { - if (fread(idata+ioff,1,c.length,img_file) != c.length) return e("outofdata","Corrupt PNG"); - } - else - #endif - { - memcpy(idata+ioff, img_buffer, c.length); - img_buffer += c.length; - } - ioff += c.length; - break; - } - - case PNG_TYPE('I','E','N','D'): { - uint32 raw_len; - if (scan != SCAN_load) return 1; - if (idata == NULL) return e("no IDAT","Corrupt PNG"); - expanded = (uint8 *) stbi_zlib_decode_malloc((char *) idata, ioff, (int *) &raw_len); - if (expanded == NULL) return 0; // zlib should set error - free(idata); idata = NULL; - if ((req_comp == img_n+1 && req_comp != 3 && !pal_img_n) || has_trans) - img_out_n = img_n+1; - else - img_out_n = img_n; - if (!create_png_image(expanded, raw_len, img_out_n)) return 0; - if (has_trans) - if (!compute_transparency(tc, img_out_n)) return 0; - if (pal_img_n) { - // pal_img_n == 3 or 4 - img_n = pal_img_n; // record the actual colors we had - img_out_n = pal_img_n; - if (req_comp >= 3) img_out_n = req_comp; - if (!expand_palette(palette, pal_len, img_out_n)) - return 0; - } - free(expanded); expanded = NULL; - return 1; - } - - default: - // if critical, fail - if ((c.type & (1 << 29)) == 0) { - #ifndef STBI_NO_FAILURE_STRINGS - static char invalid_chunk[] = "XXXX chunk not known"; - invalid_chunk[0] = (uint8) (c.type >> 24); - invalid_chunk[1] = (uint8) (c.type >> 16); - invalid_chunk[2] = (uint8) (c.type >> 8); - invalid_chunk[3] = (uint8) (c.type >> 0); - #endif - return e(invalid_chunk, "PNG not supported: unknown chunk type"); - } - skip(c.length); - break; - } - // end of chunk, read and skip CRC - get8(); get8(); get8(); get8(); - } -} - -static unsigned char *do_png(int *x, int *y, int *n, int req_comp) -{ - unsigned char *result=NULL; - if (req_comp < 0 || req_comp > 4) return ep("bad req_comp", "Internal error"); - if (parse_png_file(SCAN_load, req_comp)) { - result = out; - out = NULL; - if (req_comp && req_comp != img_out_n) { - result = convert_format(result, img_out_n, req_comp); - if (result == NULL) return result; - } - *x = img_x; - *y = img_y; - if (n) *n = img_n; - } - free(out); out = NULL; - free(expanded); expanded = NULL; - free(idata); idata = NULL; - - return result; -} - -#ifndef STBI_NO_STDIO -unsigned char *stbi_png_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp) -{ - start_file(f); - return do_png(x,y,comp,req_comp); -} - -unsigned char *stbi_png_load(char *filename, int *x, int *y, int *comp, int req_comp) -{ - unsigned char *data; - FILE *f = fopen(filename, "rb"); - if (!f) return NULL; - data = stbi_png_load_from_file(f,x,y,comp,req_comp); - fclose(f); - return data; -} -#endif - -unsigned char *stbi_png_load_from_memory(unsigned char *buffer, int len, int *x, int *y, int *comp, int req_comp) -{ - start_mem(buffer,len); - return do_png(x,y,comp,req_comp); -} - -#ifndef STBI_NO_STDIO -int stbi_png_test_file(FILE *f) -{ - int n,r; - n = ftell(f); - start_file(f); - r = parse_png_file(SCAN_type,STBI_default); - fseek(f,n,SEEK_SET); - return r; -} -#endif - -int stbi_png_test_memory(unsigned char *buffer, int len) -{ - start_mem(buffer, len); - return parse_png_file(SCAN_type,STBI_default); -} - -// TODO: load header from png -extern int stbi_png_info (char *filename, int *x, int *y, int *comp); -extern int stbi_png_info_from_file (FILE *f, int *x, int *y, int *comp); -extern int stbi_png_info_from_memory (stbi_uc *buffer, int len, int *x, int *y, int *comp); - -// Microsoft/Windows BMP image - -static int bmp_test(void) -{ - int sz; - if (get8() != 'B') return 0; - if (get8() != 'M') return 0; - get32le(); // discard filesize - get16le(); // discard reserved - get16le(); // discard reserved - get32le(); // discard data offset - sz = get32le(); - if (sz == 12 || sz == 40 || sz == 56 || sz == 108) return 1; - return 0; -} - -#ifndef STBI_NO_STDIO -int stbi_bmp_test_file (FILE *f) -{ - int r,n = ftell(f); - start_file(f); - r = bmp_test(); - fseek(f,n,SEEK_SET); - return r; -} -#endif - -int stbi_bmp_test_memory (stbi_uc *buffer, int len) -{ - start_mem(buffer, len); - return bmp_test(); -} - -// returns 0..31 for the highest set bit -static int high_bit(unsigned int z) -{ - int n=0; - if (z == 0) return -1; - if (z >= 0x10000) n += 16, z >>= 16; - if (z >= 0x00100) n += 8, z >>= 8; - if (z >= 0x00010) n += 4, z >>= 4; - if (z >= 0x00004) n += 2, z >>= 2; - if (z >= 0x00002) n += 1, z >>= 1; - return n; -} - -static int bitcount(unsigned int a) -{ - a = (a & 0x55555555) + ((a >> 1) & 0x55555555); // max 2 - a = (a & 0x33333333) + ((a >> 2) & 0x33333333); // max 4 - a = (a + (a >> 4)) & 0x0f0f0f0f; // max 8 per 4, now 8 bits - a = (a + (a >> 8)); // max 16 per 8 bits - a = (a + (a >> 16)); // max 32 per 8 bits - return a & 0xff; -} - -static int shiftsigned(int v, int shift, int bits) -{ - int result; - int z=0; - - if (shift < 0) v <<= -shift; - else v >>= shift; - result = v; - - z = bits; - while (z < 8) { - result += v >> z; - z += bits; - } - return result; -} - -static stbi_uc *bmp_load(int *x, int *y, int *comp, int req_comp) -{ - unsigned int mr=0,mg=0,mb=0,ma=0; - stbi_uc pal[256][4]; - int psize=0,i,j,compress=0,width; - int bpp, flip_vertically, pad, target, offset, hsz; - if (get8() != 'B' || get8() != 'M') return ep("not BMP", "Corrupt BMP"); - get32le(); // discard filesize - get16le(); // discard reserved - get16le(); // discard reserved - offset = get32le(); - hsz = get32le(); - if (hsz != 12 && hsz != 40 && hsz != 56 && hsz != 108) return ep("unknown BMP", "BMP type not supported: unknown"); - failure_reason = "bad BMP"; - if (hsz == 12) { - img_x = get16le(); - img_y = get16le(); - } else { - img_x = get32le(); - img_y = get32le(); - } - if (get16le() != 1) return 0; - bpp = get16le(); - if (bpp == 1) return ep("monochrome", "BMP type not supported: 1-bit"); - flip_vertically = img_y > 0; - img_y = abs(img_y); - if (hsz == 12) { - if (bpp < 24) - psize = (offset - 14 - 24) / 3; - } else { - compress = get32le(); - if (compress == 1 || compress == 2) return ep("BMP RLE", "BMP type not supported: RLE"); - get32le(); // discard sizeof - get32le(); // discard hres - get32le(); // discard vres - get32le(); // discard colorsused - get32le(); // discard max important - if (hsz == 40 || hsz == 56) { - if (hsz == 56) { - get32le(); - get32le(); - get32le(); - get32le(); - } - if (bpp == 16 || bpp == 32) { - mr = mg = mb = 0; - if (compress == 0) { - if (bpp == 32) { - mr = 0xff << 16; - mg = 0xff << 8; - mb = 0xff << 0; - } else { - mr = 31 << 10; - mg = 31 << 5; - mb = 31 << 0; - } - } else if (compress == 3) { - mr = get32le(); - mg = get32le(); - mb = get32le(); - // not documented, but generated by photoshop and handled by mspaint - if (mr == mg && mg == mb) { - // ?!?!? - return NULL; - } - } else - return NULL; - } - } else { - assert(hsz == 108); - mr = get32le(); - mg = get32le(); - mb = get32le(); - ma = get32le(); - get32le(); // discard color space - for (i=0; i < 12; ++i) - get32le(); // discard color space parameters - } - if (bpp < 16) - psize = (offset - 14 - hsz) >> 2; - } - img_n = ma ? 4 : 3; - if (req_comp && req_comp >= 3) // we can directly decode 3 or 4 - target = req_comp; - else - target = img_n; // if they want monochrome, we'll post-convert - out = (stbi_uc *) malloc(target * img_x * img_y); - if (!out) return ep("outofmem", "Out of memory"); - if (bpp < 16) { - int z=0; - if (psize == 0 || psize > 256) return ep("invalid", "Corrupt BMP"); - for (i=0; i < psize; ++i) { - pal[i][2] = get8(); - pal[i][1] = get8(); - pal[i][0] = get8(); - if (hsz != 12) get8(); - pal[i][3] = 255; - } - skip(offset - 14 - hsz - psize * (hsz == 12 ? 3 : 4)); - if (bpp == 4) width = (img_x + 1) >> 1; - else if (bpp == 8) width = img_x; - else return ep("bad bpp", "Corrupt BMP"); - pad = (-width)&3; - for (j=0; j < (int) img_y; ++j) { - for (i=0; i < (int) img_x; i += 2) { - int v=get8(),v2=0; - if (bpp == 4) { - v2 = v & 15; - v >>= 4; - } - out[z++] = pal[v][0]; - out[z++] = pal[v][1]; - out[z++] = pal[v][2]; - if (target == 4) out[z++] = 255; - if (i+1 == (int) img_x) break; - v = (bpp == 8) ? get8() : v2; - out[z++] = pal[v][0]; - out[z++] = pal[v][1]; - out[z++] = pal[v][2]; - if (target == 4) out[z++] = 255; - } - skip(pad); - } - } else { - int rshift=0,gshift=0,bshift=0,ashift=0,rcount=0,gcount=0,bcount=0,acount=0; - int z = 0; - int easy=0; - skip(offset - 14 - hsz); - if (bpp == 24) width = 3 * img_x; - else if (bpp == 16) width = 2*img_x; - else /* bpp = 32 and pad = 0 */ width=0; - pad = (-width) & 3; - if (bpp == 24) { - easy = 1; - } else if (bpp == 32) { - if (mb == 0xff && mg == 0xff00 && mr == 0xff000000 && ma == 0xff000000) - easy = 2; - } - if (!easy) { - if (!mr || !mg || !mb) return ep("bad masks", "Corrupt BMP"); - // right shift amt to put high bit in position #7 - rshift = high_bit(mr)-7; rcount = bitcount(mr); - gshift = high_bit(mg)-7; gcount = bitcount(mr); - bshift = high_bit(mb)-7; bcount = bitcount(mr); - ashift = high_bit(ma)-7; acount = bitcount(mr); - } - for (j=0; j < (int) img_y; ++j) { - if (easy) { - for (i=0; i < (int) img_x; ++i) { - int a; - out[z+2] = get8(); - out[z+1] = get8(); - out[z+0] = get8(); - z += 3; - a = (easy == 2 ? get8() : 255); - if (target == 4) out[z++] = a; - } - } else { - for (i=0; i < (int) img_x; ++i) { - unsigned long v = (bpp == 16 ? get16le() : get32le()); - int a; - out[z++] = shiftsigned(v & mr, rshift, rcount); - out[z++] = shiftsigned(v & mg, gshift, gcount); - out[z++] = shiftsigned(v & mb, bshift, bcount); - a = (ma ? shiftsigned(v & ma, ashift, acount) : 255); - if (target == 4) out[z++] = a; - } - } - skip(pad); - } - } - if (flip_vertically) { - stbi_uc t; - for (j=0; j < (int) img_y>>1; ++j) { - stbi_uc *p1 = out + j *img_x*target; - stbi_uc *p2 = out + (img_y-1-j)*img_x*target; - for (i=0; i < (int) img_x*target; ++i) { - t = p1[i], p1[i] = p2[i], p2[i] = t; - } - } - } - - if (req_comp && req_comp != target) { - out = convert_format(out, target, req_comp); - if (out == NULL) return out; // convert_format frees input on failure - } - - *x = img_x; - *y = img_y; - if (comp) *comp = target; - return out; -} - -#ifndef STBI_NO_STDIO -stbi_uc *stbi_bmp_load (char *filename, int *x, int *y, int *comp, int req_comp) -{ - stbi_uc *data; - FILE *f = fopen(filename, "rb"); - if (!f) return NULL; - data = bmp_load(x,y,comp,req_comp); - fclose(f); - return data; -} - -stbi_uc *stbi_bmp_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp) -{ - start_file(f); - return bmp_load(x,y,comp,req_comp); -} -#endif - -stbi_uc *stbi_bmp_load_from_memory (stbi_uc *buffer, int len, int *x, int *y, int *comp, int req_comp) -{ - start_mem(buffer, len); - return bmp_load(x,y,comp,req_comp); -} - -// Targa Truevision - TGA -// by Jonathan Dummer - -static int tga_test(void) -{ - int sz; - get8u(); // discard Offset - sz = get8u(); // color type - if( sz > 1 ) return 0; // only RGB or indexed allowed - sz = get8u(); // image type - if( (sz != 1) && (sz != 2) && (sz != 3) && (sz != 9) && (sz != 10) && (sz != 11) ) return 0; // only RGB or grey allowed, +/- RLE - get16(); // discard palette start - get16(); // discard palette length - get8(); // discard bits per palette color entry - get16(); // discard x origin - get16(); // discard y origin - if( get16() < 1 ) return 0; // test width - if( get16() < 1 ) return 0; // test height - sz = get8(); // bits per pixel - if( (sz != 8) && (sz != 16) && (sz != 24) && (sz != 32) ) return 0; // only RGB or RGBA or grey allowed - return 1; // seems to have passed everything -} - -#ifndef STBI_NO_STDIO -int stbi_tga_test_file (FILE *f) -{ - int r,n = ftell(f); - start_file(f); - r = tga_test(); - fseek(f,n,SEEK_SET); - return r; -} -#endif - -int stbi_tga_test_memory (stbi_uc *buffer, int len) -{ - start_mem(buffer, len); - return tga_test(); -} - -static stbi_uc *tga_load(int *x, int *y, int *comp, int req_comp) -{ - // read in the TGA header stuff - int tga_offset = get8u(); - int tga_indexed = get8u(); - int tga_image_type = get8u(); - int tga_is_RLE = 0; - int tga_palette_start = get16le(); - int tga_palette_len = get16le(); - int tga_palette_bits = get8u(); - int tga_x_origin = get16le(); - int tga_y_origin = get16le(); - int tga_width = get16le(); - int tga_height = get16le(); - int tga_bits_per_pixel = get8u(); - int tga_inverted = get8u(); - // image data - unsigned char *tga_data; - unsigned char *tga_palette = NULL; - int i, j; - unsigned char raw_data[] = { 0, 0, 0, 0 }; - unsigned char trans_data[] = { 0, 0, 0, 0 }; - int RLE_count = 0; - int RLE_repeating = 0; - int read_next_pixel = 1; - // do a tiny bit of precessing - if( tga_image_type >= 8 ) - { - tga_image_type -= 8; - tga_is_RLE = 1; - } - /* int tga_alpha_bits = tga_inverted & 15; */ - tga_inverted = 1 - ((tga_inverted >> 5) & 1); - - // error check - if( //(tga_indexed) || - (tga_width < 1) || (tga_height < 1) || - (tga_image_type < 1) || (tga_image_type > 3) || - ((tga_bits_per_pixel != 8) && (tga_bits_per_pixel != 16) && - (tga_bits_per_pixel != 24) && (tga_bits_per_pixel != 32)) - ) - { - return NULL; - } - - // If I'm paletted, then I'll use the number of bits from the palette - if( tga_indexed ) - { - tga_bits_per_pixel = tga_palette_bits; - } - - // tga info - *x = tga_width; - *y = tga_height; - if( (req_comp < 1) || (req_comp > 4) ) - { - // just use whatever the file was - req_comp = tga_bits_per_pixel / 8; - *comp = req_comp; - } else - { - // force a new number of components - *comp = req_comp; - } - tga_data = (unsigned char*)malloc( tga_width * tga_height * req_comp ); - - // skip to the data's starting position (offset usually = 0) - skip( tga_offset ); - // do I need to load a palette? - if( tga_indexed ) - { - // any data to skip? (offset usually = 0) - skip( tga_palette_start ); - // load the palette - tga_palette = (unsigned char*)malloc( tga_palette_len * tga_palette_bits / 8 ); - getn( tga_palette, tga_palette_len * tga_palette_bits / 8 ); - } - // load the data - for( i = 0; i < tga_width * tga_height; ++i ) - { - // if I'm in RLE mode, do I need to get a RLE chunk? - if( tga_is_RLE ) - { - if( RLE_count == 0 ) - { - // yep, get the next byte as a RLE command - int RLE_cmd = get8u(); - RLE_count = 1 + (RLE_cmd & 127); - RLE_repeating = RLE_cmd >> 7; - read_next_pixel = 1; - } else if( !RLE_repeating ) - { - read_next_pixel = 1; - } - } else - { - read_next_pixel = 1; - } - // OK, if I need to read a pixel, do it now - if( read_next_pixel ) - { - // load however much data we did have - if( tga_indexed ) - { - // read in 1 byte, then perform the lookup - int pal_idx = get8u(); - if( pal_idx >= tga_palette_len ) - { - // invalid index - pal_idx = 0; - } - pal_idx *= tga_bits_per_pixel / 8; - for( j = 0; j*8 < tga_bits_per_pixel; ++j ) - { - raw_data[j] = tga_palette[pal_idx+j]; - } - } else - { - // read in the data raw - for( j = 0; j*8 < tga_bits_per_pixel; ++j ) - { - raw_data[j] = get8u(); - } - } - // convert raw to the intermediate format - switch( tga_bits_per_pixel ) - { - case 8: - // Luminous => RGBA - trans_data[0] = raw_data[0]; - trans_data[1] = raw_data[0]; - trans_data[2] = raw_data[0]; - trans_data[3] = 255; - break; - case 16: - // Luminous,Alpha => RGBA - trans_data[0] = raw_data[0]; - trans_data[1] = raw_data[0]; - trans_data[2] = raw_data[0]; - trans_data[3] = raw_data[1]; - break; - case 24: - // BGR => RGBA - trans_data[0] = raw_data[2]; - trans_data[1] = raw_data[1]; - trans_data[2] = raw_data[0]; - trans_data[3] = 255; - break; - case 32: - // BGRA => RGBA - trans_data[0] = raw_data[2]; - trans_data[1] = raw_data[1]; - trans_data[2] = raw_data[0]; - trans_data[3] = raw_data[3]; - break; - } - // clear the reading flag for the next pixel - read_next_pixel = 0; - } // end of reading a pixel - // convert to final format - switch( req_comp ) - { - case 1: - // RGBA => Luminous - tga_data[i*req_comp+0] = (trans_data[0] + trans_data[1] + trans_data[2]) / 3; - break; - case 2: - // RGBA => Luminous,Alpha - tga_data[i*req_comp+0] = (trans_data[0] + trans_data[1] + trans_data[2]) / 3; - tga_data[i*req_comp+1] = trans_data[3]; - break; - case 3: - // RGBA => RGB - tga_data[i*req_comp+0] = trans_data[0]; - tga_data[i*req_comp+1] = trans_data[1]; - tga_data[i*req_comp+2] = trans_data[2]; - break; - case 4: - // RGBA => RGBA - tga_data[i*req_comp+0] = trans_data[0]; - tga_data[i*req_comp+1] = trans_data[1]; - tga_data[i*req_comp+2] = trans_data[2]; - tga_data[i*req_comp+3] = trans_data[3]; - break; - } - // in case we're in RLE mode, keep counting down - --RLE_count; - } - // do I need to invert the image? - if( tga_inverted ) - { - for( j = 0; j*2 < tga_height; ++j ) - { - int index1 = j * tga_width * req_comp; - int index2 = (tga_height - 1 - j) * tga_width * req_comp; - for( i = tga_width * req_comp; i > 0; --i ) - { - unsigned char temp = tga_data[index1]; - tga_data[index1] = tga_data[index2]; - tga_data[index2] = temp; - ++index1; - ++index2; - } - } - } - // clear my palette, if I had one - if( tga_palette != NULL ) - { - free( tga_palette ); - } - // the things I do to get rid of an error message, and yet keep - // Microsoft's C compilers happy... [8^( - tga_palette_start = tga_palette_len = tga_palette_bits = - tga_x_origin = tga_y_origin = 0; - // OK, done - return tga_data; -} - -#ifndef STBI_NO_STDIO -stbi_uc *stbi_tga_load (char *filename, int *x, int *y, int *comp, int req_comp) -{ - stbi_uc *data; - FILE *f = fopen(filename, "rb"); - if (!f) return NULL; - data = tga_load(x,y,comp,req_comp); - fclose(f); - return data; -} - -stbi_uc *stbi_tga_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp) -{ - start_file(f); - return tga_load(x,y,comp,req_comp); -} -#endif - -stbi_uc *stbi_tga_load_from_memory (stbi_uc *buffer, int len, int *x, int *y, int *comp, int req_comp) -{ - start_mem(buffer, len); - return tga_load(x,y,comp,req_comp); -} - -/// DDS file support, does decoding, _not_ direct uploading -/// (use SOIL for that ;-) - -/// A bunch of DirectDraw Surface structures and flags -typedef struct { - unsigned int dwMagic; - unsigned int dwSize; - unsigned int dwFlags; - unsigned int dwHeight; - unsigned int dwWidth; - unsigned int dwPitchOrLinearSize; - unsigned int dwDepth; - unsigned int dwMipMapCount; - unsigned int dwReserved1[ 11 ]; - - // DDPIXELFORMAT - struct { - unsigned int dwSize; - unsigned int dwFlags; - unsigned int dwFourCC; - unsigned int dwRGBBitCount; - unsigned int dwRBitMask; - unsigned int dwGBitMask; - unsigned int dwBBitMask; - unsigned int dwAlphaBitMask; - } sPixelFormat; - - // DDCAPS2 - struct { - unsigned int dwCaps1; - unsigned int dwCaps2; - unsigned int dwDDSX; - unsigned int dwReserved; - } sCaps; - unsigned int dwReserved2; -} DDS_header ; - -// the following constants were copied directly off the MSDN website - -// The dwFlags member of the original DDSURFACEDESC2 structure -// can be set to one or more of the following values. -#define DDSD_CAPS 0x00000001 -#define DDSD_HEIGHT 0x00000002 -#define DDSD_WIDTH 0x00000004 -#define DDSD_PITCH 0x00000008 -#define DDSD_PIXELFORMAT 0x00001000 -#define DDSD_MIPMAPCOUNT 0x00020000 -#define DDSD_LINEARSIZE 0x00080000 -#define DDSD_DEPTH 0x00800000 - -// DirectDraw Pixel Format -#define DDPF_ALPHAPIXELS 0x00000001 -#define DDPF_FOURCC 0x00000004 -#define DDPF_RGB 0x00000040 - -// The dwCaps1 member of the DDSCAPS2 structure can be -// set to one or more of the following values. -#define DDSCAPS_COMPLEX 0x00000008 -#define DDSCAPS_TEXTURE 0x00001000 -#define DDSCAPS_MIPMAP 0x00400000 - -// The dwCaps2 member of the DDSCAPS2 structure can be -// set to one or more of the following values. -#define DDSCAPS2_CUBEMAP 0x00000200 -#define DDSCAPS2_CUBEMAP_POSITIVEX 0x00000400 -#define DDSCAPS2_CUBEMAP_NEGATIVEX 0x00000800 -#define DDSCAPS2_CUBEMAP_POSITIVEY 0x00001000 -#define DDSCAPS2_CUBEMAP_NEGATIVEY 0x00002000 -#define DDSCAPS2_CUBEMAP_POSITIVEZ 0x00004000 -#define DDSCAPS2_CUBEMAP_NEGATIVEZ 0x00008000 -#define DDSCAPS2_VOLUME 0x00200000 - -static int dds_test(void) -{ - // check the magic number - if (get8() != 'D') return 0; - if (get8() != 'D') return 0; - if (get8() != 'S') return 0; - if (get8() != ' ') return 0; - // check header size - if (get32le() != 124) return 0; - return 1; -} -#ifndef STBI_NO_STDIO -int stbi_dds_test_file (FILE *f) -{ - int r,n = ftell(f); - start_file(f); - r = dds_test(); - fseek(f,n,SEEK_SET); - return r; -} -#endif - -int stbi_dds_test_memory (stbi_uc *buffer, int len) -{ - start_mem(buffer, len); - return dds_test(); -} - -// helper functions -int stbi_convert_bit_range( int c, int from_bits, int to_bits ) -{ - int b = (1 << (from_bits - 1)) + c * ((1 << to_bits) - 1); - return (b + (b >> from_bits)) >> from_bits; -} -void stbi_rgb_888_from_565( unsigned int c, int *r, int *g, int *b ) -{ - *r = stbi_convert_bit_range( (c >> 11) & 31, 5, 8 ); - *g = stbi_convert_bit_range( (c >> 05) & 63, 6, 8 ); - *b = stbi_convert_bit_range( (c >> 00) & 31, 5, 8 ); -} -void stbi_decode_DXT1_block( - unsigned char uncompressed[16*4], - unsigned char compressed[8] ) -{ - int next_bit = 4*8; - int i, r, g, b; - int c0, c1; - unsigned char decode_colors[4*4]; - // find the 2 primary colors - c0 = compressed[0] + (compressed[1] << 8); - c1 = compressed[2] + (compressed[3] << 8); - stbi_rgb_888_from_565( c0, &r, &g, &b ); - decode_colors[0] = r; - decode_colors[1] = g; - decode_colors[2] = b; - decode_colors[3] = 255; - stbi_rgb_888_from_565( c1, &r, &g, &b ); - decode_colors[4] = r; - decode_colors[5] = g; - decode_colors[6] = b; - decode_colors[7] = 255; - if( c0 > c1 ) - { - // no alpha, 2 interpolated colors - decode_colors[8] = (2*decode_colors[0] + decode_colors[4]) / 3; - decode_colors[9] = (2*decode_colors[1] + decode_colors[5]) / 3; - decode_colors[10] = (2*decode_colors[2] + decode_colors[6]) / 3; - decode_colors[11] = 255; - decode_colors[12] = (decode_colors[0] + 2*decode_colors[4]) / 3; - decode_colors[13] = (decode_colors[1] + 2*decode_colors[5]) / 3; - decode_colors[14] = (decode_colors[2] + 2*decode_colors[6]) / 3; - decode_colors[15] = 255; - } else - { - // 1 interpolated color, alpha - decode_colors[8] = (decode_colors[0] + decode_colors[4]) / 2; - decode_colors[9] = (decode_colors[1] + decode_colors[5]) / 2; - decode_colors[10] = (decode_colors[2] + decode_colors[6]) / 2; - decode_colors[11] = 255; - decode_colors[12] = 0; - decode_colors[13] = 0; - decode_colors[14] = 0; - decode_colors[15] = 0; - } - // decode the block - for( i = 0; i < 16*4; i += 4 ) - { - int idx = ((compressed[next_bit>>3] >> (next_bit & 7)) & 3) * 4; - next_bit += 2; - uncompressed[i+0] = decode_colors[idx+0]; - uncompressed[i+1] = decode_colors[idx+1]; - uncompressed[i+2] = decode_colors[idx+2]; - uncompressed[i+3] = decode_colors[idx+3]; - } - // done -} -void stbi_decode_DXT23_alpha_block( - unsigned char uncompressed[16*4], - unsigned char compressed[8] ) -{ - int i, next_bit = 0; - // each alpha value gets 4 bits - for( i = 3; i < 16*4; i += 4 ) - { - uncompressed[i] = stbi_convert_bit_range( - (compressed[next_bit>>3] >> (next_bit&7)) & 15, - 4, 8 ); - next_bit += 4; - } -} -void stbi_decode_DXT45_alpha_block( - unsigned char uncompressed[16*4], - unsigned char compressed[8] ) -{ - int i, next_bit = 8*2; - unsigned char decode_alpha[8]; - // each alpha value gets 3 bits, and the 1st 2 bytes are the range - decode_alpha[0] = compressed[0]; - decode_alpha[1] = compressed[1]; - if( decode_alpha[0] > decode_alpha[1] ) - { - // 6 step intermediate - decode_alpha[2] = (6*decode_alpha[0] + 1*decode_alpha[1]) / 7; - decode_alpha[3] = (5*decode_alpha[0] + 2*decode_alpha[1]) / 7; - decode_alpha[4] = (4*decode_alpha[0] + 3*decode_alpha[1]) / 7; - decode_alpha[5] = (3*decode_alpha[0] + 4*decode_alpha[1]) / 7; - decode_alpha[6] = (2*decode_alpha[0] + 5*decode_alpha[1]) / 7; - decode_alpha[7] = (1*decode_alpha[0] + 6*decode_alpha[1]) / 7; - } else - { - // 4 step intermediate, pluss full and none - decode_alpha[2] = (4*decode_alpha[0] + 1*decode_alpha[1]) / 5; - decode_alpha[3] = (3*decode_alpha[0] + 2*decode_alpha[1]) / 5; - decode_alpha[4] = (2*decode_alpha[0] + 3*decode_alpha[1]) / 5; - decode_alpha[5] = (1*decode_alpha[0] + 4*decode_alpha[1]) / 5; - decode_alpha[6] = 0; - decode_alpha[7] = 255; - } - for( i = 3; i < 16*4; i += 4 ) - { - int idx = 0, bit; - bit = (compressed[next_bit>>3] >> (next_bit&7)) & 1; - idx += bit << 0; - ++next_bit; - bit = (compressed[next_bit>>3] >> (next_bit&7)) & 1; - idx += bit << 1; - ++next_bit; - bit = (compressed[next_bit>>3] >> (next_bit&7)) & 1; - idx += bit << 2; - ++next_bit; - uncompressed[i] = decode_alpha[idx & 7]; - } - // done -} -void stbi_decode_DXT_color_block( - unsigned char uncompressed[16*4], - unsigned char compressed[8] ) -{ - int next_bit = 4*8; - int i, r, g, b; - int c0, c1; - unsigned char decode_colors[4*3]; - // find the 2 primary colors - c0 = compressed[0] + (compressed[1] << 8); - c1 = compressed[2] + (compressed[3] << 8); - stbi_rgb_888_from_565( c0, &r, &g, &b ); - decode_colors[0] = r; - decode_colors[1] = g; - decode_colors[2] = b; - stbi_rgb_888_from_565( c1, &r, &g, &b ); - decode_colors[3] = r; - decode_colors[4] = g; - decode_colors[5] = b; - // Like DXT1, but no choicees: - // no alpha, 2 interpolated colors - decode_colors[6] = (2*decode_colors[0] + decode_colors[3]) / 3; - decode_colors[7] = (2*decode_colors[1] + decode_colors[4]) / 3; - decode_colors[8] = (2*decode_colors[2] + decode_colors[5]) / 3; - decode_colors[9] = (decode_colors[0] + 2*decode_colors[3]) / 3; - decode_colors[10] = (decode_colors[1] + 2*decode_colors[4]) / 3; - decode_colors[11] = (decode_colors[2] + 2*decode_colors[5]) / 3; - // decode the block - for( i = 0; i < 16*4; i += 4 ) - { - int idx = ((compressed[next_bit>>3] >> (next_bit & 7)) & 3) * 3; - next_bit += 2; - uncompressed[i+0] = decode_colors[idx+0]; - uncompressed[i+1] = decode_colors[idx+1]; - uncompressed[i+2] = decode_colors[idx+2]; - } - // done -} -static stbi_uc *dds_load(int *x, int *y, int *comp, int req_comp) -{ - // all variables go up front - stbi_uc *dds_data = NULL; - stbi_uc block[16*4]; - stbi_uc compressed[8]; - int flags, DXT_family; - int has_alpha, has_mipmap; - int is_compressed, cubemap_faces; - int block_pitch, num_blocks; - DDS_header header; - int i, sz, cf; - // load the header - if( sizeof( DDS_header ) != 128 ) - { - return NULL; - } - getn( (stbi_uc*)(&header), 128 ); - // and do some checking - if( header.dwMagic != (('D' << 0) | ('D' << 8) | ('S' << 16) | (' ' << 24)) ) return NULL; - if( header.dwSize != 124 ) return NULL; - flags = DDSD_CAPS | DDSD_HEIGHT | DDSD_WIDTH | DDSD_PIXELFORMAT; - if( (header.dwFlags & flags) != flags ) return NULL; - /* According to the MSDN spec, the dwFlags should contain - DDSD_LINEARSIZE if it's compressed, or DDSD_PITCH if - uncompressed. Some DDS writers do not conform to the - spec, so I need to make my reader more tolerant */ - if( header.sPixelFormat.dwSize != 32 ) return NULL; - flags = DDPF_FOURCC | DDPF_RGB; - if( (header.sPixelFormat.dwFlags & flags) == 0 ) return NULL; - if( (header.sCaps.dwCaps1 & DDSCAPS_TEXTURE) == 0 ) return NULL; - // get the image data - img_x = header.dwWidth; - img_y = header.dwHeight; - img_n = 4; - is_compressed = (header.sPixelFormat.dwFlags & DDPF_FOURCC) / DDPF_FOURCC; - has_alpha = (header.sPixelFormat.dwFlags & DDPF_ALPHAPIXELS) / DDPF_ALPHAPIXELS; - has_mipmap = (header.sCaps.dwCaps1 & DDSCAPS_MIPMAP) && (header.dwMipMapCount > 1); - cubemap_faces = (header.sCaps.dwCaps2 & DDSCAPS2_CUBEMAP) / DDSCAPS2_CUBEMAP; - /* I need cubemaps to have square faces */ - cubemap_faces &= (img_x == img_y); - cubemap_faces *= 5; - cubemap_faces += 1; - block_pitch = (img_x+3) >> 2; - num_blocks = block_pitch * ((img_y+3) >> 2); - /* let the user know what's going on */ - *x = img_x; - *y = img_y; - *comp = img_n; - /* is this uncompressed? */ - if( is_compressed ) - { - /* compressed */ - // note: header.sPixelFormat.dwFourCC is something like (('D'<<0)|('X'<<8)|('T'<<16)|('1'<<24)) - DXT_family = 1 + (header.sPixelFormat.dwFourCC >> 24) - '1'; - if( (DXT_family < 1) || (DXT_family > 5) ) return NULL; - /* check the expected size...oops, nevermind... - those non-compliant writers leave - dwPitchOrLinearSize == 0 */ - // passed all the tests, get the RAM for decoding - sz = (img_x)*(img_y)*4*cubemap_faces; - dds_data = (unsigned char*)malloc( sz ); - /* do this once for each face */ - for( cf = 0; cf < cubemap_faces; ++ cf ) - { - // now read and decode all the blocks - for( i = 0; i < num_blocks; ++i ) - { - // where are we? - int bx, by, bw=4, bh=4; - int ref_x = 4 * (i % block_pitch); - int ref_y = 4 * (i / block_pitch); - // get the next block's worth of compressed data, and decompress it - if( DXT_family == 1 ) - { - // DXT1 - getn( compressed, 8 ); - stbi_decode_DXT1_block( block, compressed ); - } else if( DXT_family < 4 ) - { - // DXT2/3 - getn( compressed, 8 ); - stbi_decode_DXT23_alpha_block ( block, compressed ); - getn( compressed, 8 ); - stbi_decode_DXT_color_block ( block, compressed ); - } else - { - // DXT4/5 - getn( compressed, 8 ); - stbi_decode_DXT45_alpha_block ( block, compressed ); - getn( compressed, 8 ); - stbi_decode_DXT_color_block ( block, compressed ); - } - // is this a partial block? - if( ref_x + 4 > img_x ) - { - bw = img_x - ref_x; - } - if( ref_y + 4 > img_y ) - { - bh = img_y - ref_y; - } - // now drop our decompressed data into the buffer - for( by = 0; by < bh; ++by ) - { - int idx = 4*((ref_y+by+cf*img_x)*img_x + ref_x); - for( bx = 0; bx < bw*4; ++bx ) - { - - dds_data[idx+bx] = block[by*16+bx]; - } - } - } - /* done reading and decoding the main image... - skip MIPmaps if present */ - if( has_mipmap ) - { - int block_size = 16; - if( DXT_family == 1 ) - { - block_size = 8; - } - for( i = 1; i < header.dwMipMapCount; ++i ) - { - int mx = img_x >> (i + 2); - int my = img_y >> (i + 2); - if( mx < 1 ) - { - mx = 1; - } - if( my < 1 ) - { - my = 1; - } - skip( mx*my*block_size ); - } - } - }/* per cubemap face */ - } else - { - /* uncompressed */ - DXT_family = 0; - img_n = 3; - if( has_alpha ) - { - img_n = 4; - } - *comp = img_n; - sz = img_x*img_y*img_n*cubemap_faces; - dds_data = (unsigned char*)malloc( sz ); - /* do this once for each face */ - for( cf = 0; cf < cubemap_faces; ++ cf ) - { - /* read the main image for this face */ - getn( &dds_data[cf*img_x*img_y*img_n], img_x*img_y*img_n ); - /* done reading and decoding the main image... - skip MIPmaps if present */ - if( has_mipmap ) - { - for( i = 1; i < header.dwMipMapCount; ++i ) - { - int mx = img_x >> i; - int my = img_y >> i; - if( mx < 1 ) - { - mx = 1; - } - if( my < 1 ) - { - my = 1; - } - skip( mx*my*img_n ); - } - } - } - /* data was BGR, I need it RGB */ - for( i = 0; i < sz; i += img_n ) - { - unsigned char temp = dds_data[i]; - dds_data[i] = dds_data[i+2]; - dds_data[i+2] = temp; - } - } - /* finished decompressing into RGBA, - adjust the y size if we have a cubemap - note: sz is already up to date */ - img_y *= cubemap_faces; - *y = img_y; - // did the user want something else, or - // see if all the alpha values are 255 (i.e. no transparency) - has_alpha = 0; - if( img_n == 4) - { - for( i = 3; (i < sz) && (has_alpha == 0); i += 4 ) - { - has_alpha |= (dds_data[i] < 255); - } - } - if( (req_comp <= 4) && (req_comp >= 1) && (req_comp != img_n) ) - { - // user has some requirements, meet them - dds_data = convert_format( dds_data, img_n, req_comp ); - *comp = req_comp; - } else - { - // user had no requirements, only drop to RGB is no alpha - if( (has_alpha == 0) && (img_n == 4) ) - { - dds_data = convert_format( dds_data, 4, 3 ); - *comp = 3; - } - } - // OK, done - return dds_data; -} - -#ifndef STBI_NO_STDIO -stbi_uc *stbi_dds_load (char *filename, int *x, int *y, int *comp, int req_comp) -{ - stbi_uc *data; - FILE *f = fopen(filename, "rb"); - if (!f) return NULL; - data = dds_load(x,y,comp,req_comp); - fclose(f); - return data; -} - -stbi_uc *stbi_dds_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp) -{ - start_file(f); - return dds_load(x,y,comp,req_comp); -} -#endif - -stbi_uc *stbi_dds_load_from_memory (stbi_uc *buffer, int len, int *x, int *y, int *comp, int req_comp) -{ - start_mem(buffer, len); - return dds_load(x,y,comp,req_comp); -} - - -/////////////////////// write image /////////////////////// - -#ifndef STBI_NO_WRITE - -static void write8(FILE *f, int x) { uint8 z = (uint8) x; fwrite(&z,1,1,f); } - -static void writefv(FILE *f, char *fmt, va_list v) -{ - while (*fmt) { - switch (*fmt++) { - case ' ': break; - case '1': { uint8 x = va_arg(v, int); write8(f,x); break; } - case '2': { int16 x = va_arg(v, int); write8(f,x); write8(f,x>>8); break; } - case '4': { int32 x = va_arg(v, int); write8(f,x); write8(f,x>>8); write8(f,x>>16); write8(f,x>>24); break; } - default: - assert(0); - va_end(v); - return; - } - } -} - -static void writef(FILE *f, char *fmt, ...) -{ - va_list v; - va_start(v, fmt); - writefv(f,fmt,v); - va_end(v); -} - -static void write_pixels(FILE *f, int rgb_dir, int vdir, int x, int y, int comp, void *data, int write_alpha, int scanline_pad) -{ - uint8 bg[3] = { 255, 0, 255}, px[3]; - uint32 zero = 0; - int i,j,k, j_end; - - if (vdir < 0) - j_end = -1, j = y-1; - else - j_end = y, j = 0; - - for (; j != j_end; j += vdir) { - for (i=0; i < x; ++i) { - uint8 *d = (uint8 *) data + (j*x+i)*comp; - if (write_alpha < 0) - fwrite(&d[comp-1], 1, 1, f); - switch (comp) { - case 1: - case 2: writef(f, "111", d[0],d[0],d[0]); - break; - case 4: - if (!write_alpha) { - for (k=0; k < 3; ++k) - px[k] = bg[k] + ((d[k] - bg[k]) * d[3])/255; - writef(f, "111", px[1-rgb_dir],px[1],px[1+rgb_dir]); - break; - } - /* FALLTHROUGH */ - case 3: - writef(f, "111", d[1-rgb_dir],d[1],d[1+rgb_dir]); - break; - } - if (write_alpha > 0) - fwrite(&d[comp-1], 1, 1, f); - } - fwrite(&zero,scanline_pad,1,f); - } -} - -static int outfile(char *filename, int rgb_dir, int vdir, int x, int y, int comp, void *data, int alpha, int pad, char *fmt, ...) -{ - FILE *f = fopen(filename, "wb"); - if (f) { - va_list v; - va_start(v, fmt); - writefv(f, fmt, v); - va_end(v); - write_pixels(f,rgb_dir,vdir,x,y,comp,data,alpha,pad); - fclose(f); - } - return f != NULL; -} - -int stbi_write_bmp(char *filename, int x, int y, int comp, void *data) -{ - int pad = (-x*3) & 3; - return outfile(filename,-1,-1,x,y,comp,data,0,pad, - "11 4 22 4" "4 44 22 444444", - 'B', 'M', 14+40+(x*3+pad)*y, 0,0, 14+40, // file header - 40, x,y, 1,24, 0,0,0,0,0,0); // bitmap header -} - -int stbi_write_tga(char *filename, int x, int y, int comp, void *data) -{ - int has_alpha = !(comp & 1); - return outfile(filename, -1,-1, x, y, comp, data, has_alpha, 0, - "111 221 2222 11", 0,0,2, 0,0,0, 0,0,x,y, 24+8*has_alpha, 8*has_alpha); -} - -// any other image formats that do interleaved rgb data? -// PNG: requires adler32,crc32 -- significant amount of code -// PSD: no, channels output separately -// TIFF: no, stripwise-interleaved... i think - -#endif // STBI_NO_WRITE diff --git a/src/projectM-engine/stb_image.h b/src/projectM-engine/stb_image.h deleted file mode 100644 index 79d53c00c..000000000 --- a/src/projectM-engine/stb_image.h +++ /dev/null @@ -1,253 +0,0 @@ -/* stbi-1.00 - public domain JPEG/PNG reader - http://nothings.org/stb_image.c - when you control the images you're loading - - QUICK NOTES: - Primarily of interest to game developers and other people who can - avoid problematic images and only need the trivial interface - - JPEG baseline (no JPEG progressive, no oddball channel decimations) - PNG non-interlaced - BMP non-1bpp, non-RLE - writes BMP,TGA (define STBI_NO_WRITE to remove code) - decoded from memory or through stdio FILE (define STBI_NO_STDIO to remove code) - - JLD: - added DDS decoding code - added a few header guards, re-arrangements, etc. - added the TGA loading code (though that is in the cannonical version now [8^) - - TODO: - stbi_info_* - PSD loader - - history: - 1.00 interface to zlib that skips zlib header - 0.99 correct handling of alpha in palette - 0.98 TGA loader by lonesock; dynamically add loaders (untested) - 0.97 jpeg errors on too large a file; also catch another malloc failure - 0.96 fix detection of invalid v value - particleman@mollyrocket forum - 0.95 during header scan, seek to markers in case of padding - 0.94 STBI_NO_STDIO to disable stdio usage; rename all #defines the same - 0.93 handle jpegtran output; verbose errors - 0.92 read 4,8,16,24,32-bit BMP files of several formats - 0.91 output 24-bit Windows 3.0 BMP files - 0.90 fix a few more warnings; bump version number to approach 1.0 - 0.61 bugfixes due to Marc LeBlanc, Christopher Lloyd - 0.60 fix compiling as c++ - 0.59 fix warnings: merge Dave Moore's -Wall fixes - 0.58 fix bug: zlib uncompressed mode len/nlen was wrong endian - 0.57 fix bug: jpg last huffman symbol before marker was >9 bits but less - than 16 available - 0.56 fix bug: zlib uncompressed mode len vs. nlen - 0.55 fix bug: restart_interval not initialized to 0 - 0.54 allow NULL for 'int *comp' - 0.53 fix bug in png 3->4; speedup png decoding - 0.52 png handles req_comp=3,4 directly; minor cleanup; jpeg comments - 0.51 obey req_comp requests, 1-component jpegs return as 1-component, - on 'test' only check type, not whether we support this variant -*/ - - -/* -//// begin header file //////////////////////////////////////////////////// -// -// Limitations: -// - no progressive/interlaced support (jpeg, png) -// - 8-bit samples only (jpeg, png) -// - not threadsafe -// - channel subsampling of at most 2 in each dimension (jpeg) -// - no delayed line count (jpeg) -- IJG doesn't support either -// -// Basic usage: -// int x,y,n; -// unsigned char *data = stbi_load(filename, &x, &y, &n, 0); -// // ... process data if not NULL ... -// // ... x = width, y = height, n = # 8-bit components per pixel ... -// // ... replace '0' with '1'..'4' to force that many components per pixel -// stbi_image_free(data) -// -// Standard parameters: -// int *x -- outputs image width in pixels -// int *y -- outputs image height in pixels -// int *comp -- outputs # of image components in image file -// int req_comp -- if non-zero, # of image components requested in result -// -// The return value from an image loader is an 'unsigned char *' which points -// to the pixel data. The pixel data consists of *y scanlines of *x pixels, -// with each pixel consisting of N interleaved 8-bit components; the first -// pixel pointed to is top-left-most in the image. There is no padding between -// image scanlines or between pixels, regardless of format. The number of -// components N is 'req_comp' if req_comp is non-zero, or *comp otherwise. -// If req_comp is non-zero, *comp has the number of components that _would_ -// have been output otherwise. E.g. if you set req_comp to 4, you will always -// get RGBA output, but you can check *comp to easily see if it's opaque. -// -// An output image with N components has the following components interleaved -// in this order in each pixel: -// -// N=#comp components -// 1 grey -// 2 grey, alpha -// 3 red, green, blue -// 4 red, green, blue, alpha -// -// If image loading fails for any reason, the return value will be NULL, -// and *x, *y, *comp will be unchanged. The function stbi_failure_reason() -// can be queried for an extremely brief, end-user unfriendly explanation -// of why the load failed. Define STBI_NO_FAILURE_STRINGS to avoid -// compiling these strings at all, and STBI_FAILURE_USERMSG to get slightly -// more user-friendly ones. -// -// Paletted PNG and BMP images are automatically depalettized. -*/ - -#ifndef HEADER_STB_IMAGE -#define HEADER_STB_IMAGE - -#ifndef STBI_NO_STDIO -#include -#endif - -enum -{ - STBI_default = 0, // only used for req_comp - - STBI_grey = 1, - STBI_grey_alpha = 2, - STBI_rgb = 3, - STBI_rgb_alpha = 4 -}; - -typedef unsigned char stbi_uc; - -#ifdef __cplusplus -extern "C" { -#endif - -// WRITING API - -#if !defined(STBI_NO_WRITE) && !defined(STBI_NO_STDIO) -// write a BMP/TGA file given tightly packed 'comp' channels (no padding, nor bmp-stride-padding) -// (you must include the appropriate extension in the filename). -// returns TRUE on success, FALSE if couldn't open file, error writing file -extern int stbi_write_bmp (char *filename, int x, int y, int comp, void *data); -extern int stbi_write_tga (char *filename, int x, int y, int comp, void *data); -#endif - -// PRIMARY API - works on images of any type - -// load image by filename, open file, or memory buffer -#ifndef STBI_NO_STDIO -extern stbi_uc *stbi_load (char *filename, int *x, int *y, int *comp, int req_comp); -extern stbi_uc *stbi_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp); -extern int stbi_info_from_file (FILE *f, int *x, int *y, int *comp); -#endif -extern stbi_uc *stbi_load_from_memory(stbi_uc *buffer, int len, int *x, int *y, int *comp, int req_comp); -// for stbi_load_from_file, file pointer is left pointing immediately after image - -// get a VERY brief reason for failure -extern char *stbi_failure_reason (void); - -// free the loaded image -- this is just free() -extern void stbi_image_free (stbi_uc *retval_from_stbi_load); - -// get image dimensions & components without fully decoding -extern int stbi_info_from_memory(stbi_uc *buffer, int len, int *x, int *y, int *comp); -#ifndef STBI_NO_STDIO -extern int stbi_info (char *filename, int *x, int *y, int *comp); -#endif - -// ZLIB client - used by PNG, available for other purposes - -extern char *stbi_zlib_decode_malloc_guesssize(int initial_size, int *outlen); -extern char *stbi_zlib_decode_malloc(char *buffer, int len, int *outlen); -extern int stbi_zlib_decode_buffer(char *obuffer, int olen, char *ibuffer, int ilen); - -extern char *stbi_zlib_decode_noheader_malloc(char *buffer, int len, int *outlen); -extern int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, char *ibuffer, int ilen); - - -// TYPE-SPECIFIC ACCESS - -// is it a jpeg? -extern int stbi_jpeg_test_memory (stbi_uc *buffer, int len); -extern stbi_uc *stbi_jpeg_load_from_memory(stbi_uc *buffer, int len, int *x, int *y, int *comp, int req_comp); -extern int stbi_jpeg_info_from_memory(stbi_uc *buffer, int len, int *x, int *y, int *comp); - -#ifndef STBI_NO_STDIO -extern stbi_uc *stbi_jpeg_load (char *filename, int *x, int *y, int *comp, int req_comp); -extern int stbi_jpeg_test_file (FILE *f); -extern stbi_uc *stbi_jpeg_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp); - -extern int stbi_jpeg_info (char *filename, int *x, int *y, int *comp); -extern int stbi_jpeg_info_from_file (FILE *f, int *x, int *y, int *comp); -#endif - -extern int stbi_jpeg_dc_only; // only decode DC component - -// is it a png? -extern int stbi_png_test_memory (stbi_uc *buffer, int len); -extern stbi_uc *stbi_png_load_from_memory (stbi_uc *buffer, int len, int *x, int *y, int *comp, int req_comp); -extern int stbi_png_info_from_memory (stbi_uc *buffer, int len, int *x, int *y, int *comp); - -#ifndef STBI_NO_STDIO -extern stbi_uc *stbi_png_load (char *filename, int *x, int *y, int *comp, int req_comp); -extern int stbi_png_info (char *filename, int *x, int *y, int *comp); -extern int stbi_png_test_file (FILE *f); -extern stbi_uc *stbi_png_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp); -extern int stbi_png_info_from_file (FILE *f, int *x, int *y, int *comp); -#endif - -// is it a bmp? -extern int stbi_bmp_test_memory (stbi_uc *buffer, int len); - -extern stbi_uc *stbi_bmp_load (char *filename, int *x, int *y, int *comp, int req_comp); -extern stbi_uc *stbi_bmp_load_from_memory (stbi_uc *buffer, int len, int *x, int *y, int *comp, int req_comp); -#ifndef STBI_NO_STDIO -extern int stbi_bmp_test_file (FILE *f); -extern stbi_uc *stbi_bmp_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp); -#endif - -// is it a tga? -extern int stbi_tga_test_memory (stbi_uc *buffer, int len); - -extern stbi_uc *stbi_tga_load (char *filename, int *x, int *y, int *comp, int req_comp); -extern stbi_uc *stbi_tga_load_from_memory (stbi_uc *buffer, int len, int *x, int *y, int *comp, int req_comp); -#ifndef STBI_NO_STDIO -extern int stbi_tga_test_file (FILE *f); -extern stbi_uc *stbi_tga_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp); -#endif - -// is it a DDS file? -extern int stbi_dds_test_memory (stbi_uc *buffer, int len); - -extern stbi_uc *stbi_dds_load (char *filename, int *x, int *y, int *comp, int req_comp); -extern stbi_uc *stbi_dds_load_from_memory (stbi_uc *buffer, int len, int *x, int *y, int *comp, int req_comp); -#ifndef STBI_NO_STDIO -extern int stbi_dds_test_file (FILE *f); -extern stbi_uc *stbi_dds_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp); -#endif - -// define new loaders -typedef struct -{ - int (*test_memory)(stbi_uc *buffer, int len); - stbi_uc * (*load_from_memory)(stbi_uc *buffer, int len, int *x, int *y, int *comp, int req_comp); - #ifndef STBI_NO_STDIO - int (*test_file)(FILE *f); - stbi_uc * (*load_from_file)(FILE *f, int *x, int *y, int *comp, int req_comp); - #endif -} stbi_loader; - -// register a loader by filling out the above structure (you must defined ALL functions) -// returns 1 if added or already added, 0 if not added (too many loaders) -extern int stbi_register_loader(stbi_loader *loader); - -#ifdef __cplusplus -} -#endif - -// -// -//// end header file ///////////////////////////////////////////////////// -#endif // HEADER_STB_IMAGE