X-Git-Url: http://git.xonotic.org/?a=blobdiff_plain;f=jpeg.c;h=70171f8904eb1f1374023b2666529321f642ef05;hb=cd4b8dfb40679d00e1803be76e1b6ea0ce32df96;hp=b0a8da9072e740d100e1c8880b4ccfb17a05559f;hpb=7c81e060b8ad1da8f3fafd5ff2a6d580d933653b;p=xonotic%2Fdarkplaces.git diff --git a/jpeg.c b/jpeg.c index b0a8da90..70171f89 100644 --- a/jpeg.c +++ b/jpeg.c @@ -38,9 +38,9 @@ ================================================================= */ -// jboolean is qbyte instead of int on Win32 +// jboolean is unsigned char instead of int on Win32 #ifdef WIN32 -typedef qbyte jboolean; +typedef unsigned char jboolean; #else typedef int jboolean; #endif @@ -119,7 +119,7 @@ struct jpeg_error_mgr struct jpeg_source_mgr { - const qbyte *next_input_byte; + const unsigned char *next_input_byte; size_t bytes_in_buffer; void (*init_source) (j_decompress_ptr cinfo); @@ -129,6 +129,71 @@ struct jpeg_source_mgr void (*term_source) (j_decompress_ptr cinfo); }; +typedef struct { + /* These values are fixed over the whole image. */ + /* For compression, they must be supplied by parameter setup; */ + /* for decompression, they are read from the SOF marker. */ + int component_id; /* identifier for this component (0..255) */ + int component_index; /* its index in SOF or cinfo->comp_info[] */ + int h_samp_factor; /* horizontal sampling factor (1..4) */ + int v_samp_factor; /* vertical sampling factor (1..4) */ + int quant_tbl_no; /* quantization table selector (0..3) */ + /* These values may vary between scans. */ + /* For compression, they must be supplied by parameter setup; */ + /* for decompression, they are read from the SOS marker. */ + /* The decompressor output side may not use these variables. */ + int dc_tbl_no; /* DC entropy table selector (0..3) */ + int ac_tbl_no; /* AC entropy table selector (0..3) */ + + /* Remaining fields should be treated as private by applications. */ + + /* These values are computed during compression or decompression startup: */ + /* Component's size in DCT blocks. + * Any dummy blocks added to complete an MCU are not counted; therefore + * these values do not depend on whether a scan is interleaved or not. + */ + JDIMENSION width_in_blocks; + JDIMENSION height_in_blocks; + /* Size of a DCT block in samples. Always DCTSIZE for compression. + * For decompression this is the size of the output from one DCT block, + * reflecting any scaling we choose to apply during the IDCT step. + * Values of 1,2,4,8 are likely to be supported. Note that different + * components may receive different IDCT scalings. + */ + int DCT_scaled_size; + /* The downsampled dimensions are the component's actual, unpadded number + * of samples at the main buffer (preprocessing/compression interface), thus + * downsampled_width = ceil(image_width * Hi/Hmax) + * and similarly for height. For decompression, IDCT scaling is included, so + * downsampled_width = ceil(image_width * Hi/Hmax * DCT_scaled_size/DCTSIZE) + */ + JDIMENSION downsampled_width; /* actual width in samples */ + JDIMENSION downsampled_height; /* actual height in samples */ + /* This flag is used only for decompression. In cases where some of the + * components will be ignored (eg grayscale output from YCbCr image), + * we can skip most computations for the unused components. + */ + jboolean component_needed; /* do we need the value of this component? */ + + /* These values are computed before starting a scan of the component. */ + /* The decompressor output side may not use these variables. */ + int MCU_width; /* number of blocks per MCU, horizontally */ + int MCU_height; /* number of blocks per MCU, vertically */ + int MCU_blocks; /* MCU_width * MCU_height */ + int MCU_sample_width; /* MCU width in samples, MCU_width*DCT_scaled_size */ + int last_col_width; /* # of non-dummy blocks across in last MCU */ + int last_row_height; /* # of non-dummy blocks down in last MCU */ + + /* Saved quantization table for component; NULL if none yet saved. + * See jdinput.c comments about the need for this information. + * This field is currently used only for decompression. + */ + void *quant_table; + + /* Private per-component storage for DCT or IDCT subsystem. */ + void * dct_table; +} jpeg_component_info; + struct jpeg_decompress_struct { struct jpeg_error_mgr *err; // USED @@ -183,21 +248,21 @@ struct jpeg_decompress_struct void *dc_huff_tbl_ptrs[NUM_HUFF_TBLS]; void *ac_huff_tbl_ptrs[NUM_HUFF_TBLS]; int data_precision; - void *comp_info; + jpeg_component_info *comp_info; jboolean progressive_mode; jboolean arith_code; - qbyte arith_dc_L[NUM_ARITH_TBLS]; - qbyte arith_dc_U[NUM_ARITH_TBLS]; - qbyte arith_ac_K[NUM_ARITH_TBLS]; + unsigned char arith_dc_L[NUM_ARITH_TBLS]; + unsigned char arith_dc_U[NUM_ARITH_TBLS]; + unsigned char arith_ac_K[NUM_ARITH_TBLS]; unsigned int restart_interval; jboolean saw_JFIF_marker; - qbyte JFIF_major_version; - qbyte JFIF_minor_version; - qbyte density_unit; + unsigned char JFIF_major_version; + unsigned char JFIF_minor_version; + unsigned char density_unit; unsigned short X_density; unsigned short Y_density; jboolean saw_Adobe_marker; - qbyte Adobe_transform; + unsigned char Adobe_transform; jboolean CCIR601_sampling; void *marker_list; int max_h_samp_factor; @@ -206,7 +271,7 @@ struct jpeg_decompress_struct JDIMENSION total_iMCU_rows; void *sample_range_limit; int comps_in_scan; - void *cur_comp_info[MAX_COMPS_IN_SCAN]; + jpeg_component_info *cur_comp_info[MAX_COMPS_IN_SCAN]; JDIMENSION MCUs_per_row; JDIMENSION MCU_rows_in_scan; int blocks_in_MCU; @@ -246,13 +311,13 @@ struct jpeg_compress_struct int num_components; J_COLOR_SPACE jpeg_color_space; - void *comp_info; + jpeg_component_info *comp_info; void *quant_tbl_ptrs[NUM_QUANT_TBLS]; void *dc_huff_tbl_ptrs[NUM_HUFF_TBLS]; void *ac_huff_tbl_ptrs[NUM_HUFF_TBLS]; - qbyte arith_dc_L[NUM_ARITH_TBLS]; - qbyte arith_dc_U[NUM_ARITH_TBLS]; - qbyte arith_ac_K[NUM_ARITH_TBLS]; + unsigned char arith_dc_L[NUM_ARITH_TBLS]; + unsigned char arith_dc_U[NUM_ARITH_TBLS]; + unsigned char arith_ac_K[NUM_ARITH_TBLS]; int num_scans; const void *scan_info; @@ -267,9 +332,9 @@ struct jpeg_compress_struct int restart_in_rows; jboolean write_JFIF_header; - qbyte JFIF_major_version; - qbyte JFIF_minor_version; - qbyte density_unit; + unsigned char JFIF_major_version; + unsigned char JFIF_minor_version; + unsigned char density_unit; unsigned short X_density; unsigned short Y_density; jboolean write_Adobe_marker; @@ -280,7 +345,7 @@ struct jpeg_compress_struct int max_v_samp_factor; JDIMENSION total_iMCU_rows; int comps_in_scan; - void *cur_comp_info[MAX_COMPS_IN_SCAN]; + jpeg_component_info *cur_comp_info[MAX_COMPS_IN_SCAN]; JDIMENSION MCUs_per_row; JDIMENSION MCU_rows_in_scan; int blocks_in_MCU; @@ -302,7 +367,7 @@ struct jpeg_compress_struct struct jpeg_destination_mgr { - qbyte* next_output_byte; + unsigned char* next_output_byte; size_t free_in_buffer; void (*init_destination) (j_compress_ptr cinfo); @@ -333,13 +398,13 @@ static void (*qjpeg_finish_compress) (j_compress_ptr cinfo); static jboolean (*qjpeg_finish_decompress) (j_decompress_ptr cinfo); static jboolean (*qjpeg_resync_to_restart) (j_decompress_ptr cinfo, int desired); static int (*qjpeg_read_header) (j_decompress_ptr cinfo, jboolean require_image); -static JDIMENSION (*qjpeg_read_scanlines) (j_decompress_ptr cinfo, qbyte** scanlines, JDIMENSION max_lines); +static JDIMENSION (*qjpeg_read_scanlines) (j_decompress_ptr cinfo, unsigned char** scanlines, JDIMENSION max_lines); static void (*qjpeg_set_defaults) (j_compress_ptr cinfo); static void (*qjpeg_set_quality) (j_compress_ptr cinfo, int quality, jboolean force_baseline); static jboolean (*qjpeg_start_compress) (j_compress_ptr cinfo, jboolean write_all_tables); static jboolean (*qjpeg_start_decompress) (j_decompress_ptr cinfo); static struct jpeg_error_mgr* (*qjpeg_std_error) (struct jpeg_error_mgr *err); -static JDIMENSION (*qjpeg_write_scanlines) (j_compress_ptr cinfo, qbyte** scanlines, JDIMENSION num_lines); +static JDIMENSION (*qjpeg_write_scanlines) (j_compress_ptr cinfo, unsigned char** scanlines, JDIMENSION num_lines); static dllfunction_t jpegfuncs[] = { @@ -364,7 +429,7 @@ static dllfunction_t jpegfuncs[] = // Handle for JPEG DLL dllhandle_t jpeg_dll = NULL; -static qbyte jpeg_eoi_marker [2] = {0xFF, JPEG_EOI}; +static unsigned char jpeg_eoi_marker [2] = {0xFF, JPEG_EOI}; static qboolean error_in_jpeg; // Our own output manager for JPEG compression @@ -373,7 +438,8 @@ typedef struct struct jpeg_destination_mgr pub; qfile_t* outfile; - qbyte* buffer; + unsigned char* buffer; + size_t bufsize; // used if outfile is NULL } my_destination_mgr; typedef my_destination_mgr* my_dest_ptr; @@ -415,14 +481,7 @@ qboolean JPEG_OpenLibrary (void) return true; // Load the DLL - if (! Sys_LoadLibrary (dllnames, &jpeg_dll, jpegfuncs)) - { - Con_Printf ("JPEG support disabled\n"); - return false; - } - - Con_Printf ("JPEG support enabled\n"); - return true; + return Sys_LoadLibrary (dllnames, &jpeg_dll, jpegfuncs); } @@ -470,12 +529,12 @@ static void JPEG_SkipInputData (j_decompress_ptr cinfo, long num_bytes) cinfo->src->bytes_in_buffer -= num_bytes; } -static void JPEG_MemSrc (j_decompress_ptr cinfo, const qbyte *buffer) +static void JPEG_MemSrc (j_decompress_ptr cinfo, const unsigned char *buffer, size_t filesize) { - cinfo->src = cinfo->mem->alloc_small ((j_common_ptr) cinfo, JPOOL_PERMANENT, sizeof (struct jpeg_source_mgr)); + cinfo->src = (struct jpeg_source_mgr *)cinfo->mem->alloc_small ((j_common_ptr) cinfo, JPOOL_PERMANENT, sizeof (struct jpeg_source_mgr)); cinfo->src->next_input_byte = buffer; - cinfo->src->bytes_in_buffer = fs_filesize; + cinfo->src->bytes_in_buffer = filesize; cinfo->src->init_source = JPEG_Noop; cinfo->src->fill_input_buffer = JPEG_FillInputBuffer; @@ -495,14 +554,14 @@ static void JPEG_ErrorExit (j_common_ptr cinfo) ==================== JPEG_LoadImage -Load a JPEG image into a RGBA buffer +Load a JPEG image into a BGRA buffer ==================== */ -qbyte* JPEG_LoadImage (const qbyte *f, int matchwidth, int matchheight) +unsigned char* JPEG_LoadImage_BGRA (const unsigned char *f, int filesize) { struct jpeg_decompress_struct cinfo; struct jpeg_error_mgr jerr; - qbyte *image_rgba, *scanline; + unsigned char *image_buffer, *scanline; unsigned int line; // No DLL = no JPEGs @@ -511,31 +570,27 @@ qbyte* JPEG_LoadImage (const qbyte *f, int matchwidth, int matchheight) cinfo.err = qjpeg_std_error (&jerr); qjpeg_create_decompress (&cinfo); - JPEG_MemSrc (&cinfo, f); + JPEG_MemSrc (&cinfo, f, filesize); qjpeg_read_header (&cinfo, TRUE); qjpeg_start_decompress (&cinfo); image_width = cinfo.image_width; image_height = cinfo.image_height; - if ((matchwidth && image_width != matchwidth) || (matchheight && image_height != matchheight)) - { - qjpeg_finish_decompress (&cinfo); - qjpeg_destroy_decompress (&cinfo); - return NULL; - } if (image_width > 4096 || image_height > 4096 || image_width <= 0 || image_height <= 0) { Con_Printf("JPEG_LoadImage: invalid image size %ix%i\n", image_width, image_height); return NULL; } - image_rgba = Mem_Alloc(tempmempool, image_width * image_height * 4); - scanline = Mem_Alloc(tempmempool, image_width * cinfo.output_components); - if (!image_rgba || !scanline) + image_buffer = (unsigned char *)Mem_Alloc(tempmempool, image_width * image_height * 4); + scanline = (unsigned char *)Mem_Alloc(tempmempool, image_width * cinfo.output_components); + if (!image_buffer || !scanline) { - if (!image_rgba) - Mem_Free (image_rgba); + if (image_buffer) + Mem_Free (image_buffer); + if (scanline) + Mem_Free (scanline); Con_Printf("JPEG_LoadImage: not enough memory for %i by %i image\n", image_width, image_height); qjpeg_finish_decompress (&cinfo); @@ -547,22 +602,22 @@ qbyte* JPEG_LoadImage (const qbyte *f, int matchwidth, int matchheight) line = 0; while (cinfo.output_scanline < cinfo.output_height) { - qbyte *buffer_ptr; + unsigned char *buffer_ptr; int ind; qjpeg_read_scanlines (&cinfo, &scanline, 1); - // Convert the image to RGBA + // Convert the image to BGRA switch (cinfo.output_components) { // RGB images case 3: - buffer_ptr = &image_rgba[image_width * line * 4]; + buffer_ptr = &image_buffer[image_width * line * 4]; for (ind = 0; ind < image_width * 3; ind += 3, buffer_ptr += 4) { - buffer_ptr[0] = scanline[ind]; + buffer_ptr[2] = scanline[ind]; buffer_ptr[1] = scanline[ind + 1]; - buffer_ptr[2] = scanline[ind + 2]; + buffer_ptr[0] = scanline[ind + 2]; buffer_ptr[3] = 255; } break; @@ -570,7 +625,7 @@ qbyte* JPEG_LoadImage (const qbyte *f, int matchwidth, int matchheight) // Greyscale images (default to it, just in case) case 1: default: - buffer_ptr = &image_rgba[image_width * line * 4]; + buffer_ptr = &image_buffer[image_width * line * 4]; for (ind = 0; ind < image_width; ind++, buffer_ptr += 4) { buffer_ptr[0] = scanline[ind]; @@ -587,7 +642,7 @@ qbyte* JPEG_LoadImage (const qbyte *f, int matchwidth, int matchheight) qjpeg_finish_decompress (&cinfo); qjpeg_destroy_decompress (&cinfo); - return image_rgba; + return image_buffer; } @@ -603,7 +658,7 @@ qbyte* JPEG_LoadImage (const qbyte *f, int matchwidth, int matchheight) static void JPEG_InitDestination (j_compress_ptr cinfo) { my_dest_ptr dest = (my_dest_ptr)cinfo->dest; - dest->buffer = (qbyte*)cinfo->mem->alloc_small ((j_common_ptr) cinfo, JPOOL_IMAGE, JPEG_OUTPUT_BUF_SIZE * sizeof(qbyte)); + dest->buffer = (unsigned char*)cinfo->mem->alloc_small ((j_common_ptr) cinfo, JPOOL_IMAGE, JPEG_OUTPUT_BUF_SIZE * sizeof(unsigned char)); dest->pub.next_output_byte = dest->buffer; dest->pub.free_in_buffer = JPEG_OUTPUT_BUF_SIZE; } @@ -634,7 +689,7 @@ static void JPEG_TermDestination (j_compress_ptr cinfo) error_in_jpeg = true; } -static void JPEG_MemDest (j_compress_ptr cinfo, qfile_t* outfile) +static void JPEG_FileDest (j_compress_ptr cinfo, qfile_t* outfile) { my_dest_ptr dest; @@ -649,6 +704,42 @@ static void JPEG_MemDest (j_compress_ptr cinfo, qfile_t* outfile) dest->outfile = outfile; } +static void JPEG_Mem_InitDestination (j_compress_ptr cinfo) +{ + my_dest_ptr dest = (my_dest_ptr)cinfo->dest; + dest->pub.next_output_byte = dest->buffer; + dest->pub.free_in_buffer = dest->bufsize; +} + +static jboolean JPEG_Mem_EmptyOutputBuffer (j_compress_ptr cinfo) +{ + error_in_jpeg = true; + return false; +} + +static void JPEG_Mem_TermDestination (j_compress_ptr cinfo) +{ + my_dest_ptr dest = (my_dest_ptr)cinfo->dest; + dest->bufsize = dest->pub.next_output_byte - dest->buffer; +} +static void JPEG_MemDest (j_compress_ptr cinfo, void* buf, size_t bufsize) +{ + my_dest_ptr dest; + + // First time for this JPEG object? + if (cinfo->dest == NULL) + cinfo->dest = (struct jpeg_destination_mgr *)(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT, sizeof(my_destination_mgr)); + + dest = (my_dest_ptr)cinfo->dest; + dest->pub.init_destination = JPEG_Mem_InitDestination; + dest->pub.empty_output_buffer = JPEG_Mem_EmptyOutputBuffer; + dest->pub.term_destination = JPEG_Mem_TermDestination; + dest->outfile = NULL; + + dest->buffer = buf; + dest->bufsize = bufsize; +} + /* ==================== @@ -657,11 +748,11 @@ JPEG_SaveImage_preflipped Save a preflipped JPEG image to a file ==================== */ -qboolean JPEG_SaveImage_preflipped (const char *filename, int width, int height, qbyte *data) +qboolean JPEG_SaveImage_preflipped (const char *filename, int width, int height, unsigned char *data) { struct jpeg_compress_struct cinfo; struct jpeg_error_mgr jerr; - qbyte *scanline; + unsigned char *scanline; unsigned int offset, linesize; qfile_t* file; @@ -682,7 +773,7 @@ qboolean JPEG_SaveImage_preflipped (const char *filename, int width, int height, error_in_jpeg = false; qjpeg_create_compress (&cinfo); - JPEG_MemDest (&cinfo, file); + JPEG_FileDest (&cinfo, file); // Set the parameters for compression cinfo.image_width = width; @@ -690,7 +781,17 @@ qboolean JPEG_SaveImage_preflipped (const char *filename, int width, int height, cinfo.in_color_space = JCS_RGB; cinfo.input_components = 3; qjpeg_set_defaults (&cinfo); - qjpeg_set_quality (&cinfo, scr_screenshot_jpeg_quality.value * 100, TRUE); + qjpeg_set_quality (&cinfo, (int)(scr_screenshot_jpeg_quality.value * 100), TRUE); + + // turn off subsampling (to make text look better) + cinfo.optimize_coding = 1; + cinfo.comp_info[0].h_samp_factor = 1; + cinfo.comp_info[0].v_samp_factor = 1; + cinfo.comp_info[1].h_samp_factor = 1; + cinfo.comp_info[1].v_samp_factor = 1; + cinfo.comp_info[2].h_samp_factor = 1; + cinfo.comp_info[2].v_samp_factor = 1; + qjpeg_start_compress (&cinfo, true); // Compress each scanline @@ -711,3 +812,218 @@ qboolean JPEG_SaveImage_preflipped (const char *filename, int width, int height, FS_Close (file); return true; } + +static size_t JPEG_try_SaveImage_to_Buffer (struct jpeg_compress_struct *cinfo, char *jpegbuf, size_t jpegsize, int quality, int width, int height, unsigned char *data) +{ + unsigned char *scanline; + unsigned int linesize; + int offset; + + error_in_jpeg = false; + + JPEG_MemDest (cinfo, jpegbuf, jpegsize); + + // Set the parameters for compression + cinfo->image_width = width; + cinfo->image_height = height; + cinfo->in_color_space = JCS_RGB; + cinfo->input_components = 3; + qjpeg_set_defaults (cinfo); + qjpeg_set_quality (cinfo, quality, FALSE); + + cinfo->comp_info[0].h_samp_factor = 2; + cinfo->comp_info[0].v_samp_factor = 2; + cinfo->comp_info[1].h_samp_factor = 1; + cinfo->comp_info[1].v_samp_factor = 1; + cinfo->comp_info[2].h_samp_factor = 1; + cinfo->comp_info[2].v_samp_factor = 1; + cinfo->optimize_coding = 1; + + qjpeg_start_compress (cinfo, true); + + // Compress each scanline + linesize = width * 3; + offset = linesize * (cinfo->image_height - 1); + while (cinfo->next_scanline < cinfo->image_height) + { + scanline = &data[offset - cinfo->next_scanline * linesize]; + + qjpeg_write_scanlines (cinfo, &scanline, 1); + if (error_in_jpeg) + break; + } + + qjpeg_finish_compress (cinfo); + + return error_in_jpeg ? 0 : ((my_dest_ptr) cinfo->dest)->bufsize; +} + +size_t JPEG_SaveImage_to_Buffer (char *jpegbuf, size_t jpegsize, int width, int height, unsigned char *data) +{ + struct jpeg_compress_struct cinfo; + struct jpeg_error_mgr jerr; + + int quality; + int quality_guess; + size_t result; + + // No DLL = no JPEGs + if (!jpeg_dll) + { + Con_Print("You need the libjpeg library to save JPEG images\n"); + return false; + } + + cinfo.err = qjpeg_std_error (&jerr); + cinfo.err->error_exit = JPEG_ErrorExit; + + qjpeg_create_compress (&cinfo); + +#if 0 + // used to get the formula below + { + char buf[1048576]; + unsigned char *img; + int i; + + img = Mem_Alloc(tempmempool, width * height * 3); + for(i = 0; i < width * height * 3; ++i) + img[i] = rand() & 0xFF; + + for(i = 0; i <= 100; ++i) + { + Con_Printf("! %d %d %d %d\n", width, height, i, (int) JPEG_try_SaveImage_to_Buffer(&cinfo, buf, sizeof(buf), i, width, height, img)); + } + + Mem_Free(img); + } +#endif + + //quality_guess = (100 * jpegsize - 41000) / (width*height) + 2; // fits random data + quality_guess = (256 * jpegsize - 81920) / (width*height) - 8; // fits Nexuiz's map pictures + + quality_guess = bound(0, quality_guess, 90); + quality = quality_guess + 10; // assume it can do 10 failed attempts + + while(!(result = JPEG_try_SaveImage_to_Buffer(&cinfo, jpegbuf, jpegsize, quality, width, height, data))) + { + --quality; + if(quality < 0) + { + Con_Printf("couldn't write image at all, probably too big\n"); + return 0; + } + } + Con_DPrintf("JPEG_SaveImage_to_Buffer: guessed quality/size %d/%d, actually got %d/%d\n", quality_guess, (int)jpegsize, quality, (int)result); + + return result; +} + +typedef struct CompressedImageCacheItem +{ + char imagename[MAX_QPATH]; + size_t maxsize; + void *compressed; + size_t compressed_size; + struct CompressedImageCacheItem *next; +} +CompressedImageCacheItem; +#define COMPRESSEDIMAGECACHE_SIZE 4096 +static CompressedImageCacheItem *CompressedImageCache[COMPRESSEDIMAGECACHE_SIZE]; + +static void CompressedImageCache_Add(const char *imagename, size_t maxsize, void *compressed, size_t compressed_size) +{ + const char *hashkey = va("%s:%d", imagename, (int) maxsize); + int hashindex = CRC_Block((unsigned char *) hashkey, strlen(hashkey)) % COMPRESSEDIMAGECACHE_SIZE; + CompressedImageCacheItem *i; + + if(strlen(imagename) >= MAX_QPATH) + return; // can't add this + + i = Z_Malloc(sizeof(CompressedImageCacheItem)); + strlcpy(i->imagename, imagename, sizeof(i->imagename)); + i->maxsize = maxsize; + i->compressed = compressed; + i->compressed_size = compressed_size; + i->next = CompressedImageCache[hashindex]; + CompressedImageCache[hashindex] = i; +} + +static CompressedImageCacheItem *CompressedImageCache_Find(const char *imagename, size_t maxsize) +{ + const char *hashkey = va("%s:%d", imagename, (int) maxsize); + int hashindex = CRC_Block((unsigned char *) hashkey, strlen(hashkey)) % COMPRESSEDIMAGECACHE_SIZE; + CompressedImageCacheItem *i = CompressedImageCache[hashindex]; + + while(i) + { + if(i->maxsize == maxsize) + if(!strcmp(i->imagename, imagename)) + return i; + } + return NULL; +} + +qboolean Image_Compress(const char *imagename, size_t maxsize, void **buf, size_t *size) +{ + unsigned char *imagedata, *newimagedata; + int maxPixelCount; + int components[3] = {2, 1, 0}; + + // No DLL = no JPEGs + if (!jpeg_dll) + { + Con_Print("You need the libjpeg library to save JPEG images\n"); + return false; + } + + CompressedImageCacheItem *i = CompressedImageCache_Find(imagename, maxsize); + if(i) + { + *size = i->compressed_size; + *buf = i->compressed; + } + + // load the image + imagedata = loadimagepixelsbgra(imagename, true, false); + if(!imagedata) + return false; + + // find an appropriate size for somewhat okay compression + if(maxsize <= 768) + maxPixelCount = 32 * 32; + else if(maxsize <= 1024) + maxPixelCount = 64 * 64; + else if(maxsize <= 4096) + maxPixelCount = 128 * 128; + else + maxPixelCount = 256 * 256; + + while(image_width * image_height > maxPixelCount) + { + int one = 1; + Image_MipReduce32(imagedata, imagedata, &image_width, &image_height, &one, image_width/2, image_height/2, 1); + } + + newimagedata = Mem_Alloc(tempmempool, image_width * image_height * 3); + + // convert the image from BGRA to RGB + Image_CopyMux(newimagedata, imagedata, image_width, image_height, false, false, false, 3, 4, components); + Mem_Free(imagedata); + + // try to compress it to JPEG + *buf = Z_Malloc(maxsize); + *size = JPEG_SaveImage_to_Buffer(*buf, maxsize, image_width, image_height, newimagedata); + if(!*size) + { + Z_Free(*buf); + *buf = NULL; + Con_Printf("could not compress image %s to %d bytes\n", imagename, (int)maxsize); + // return false; + // also cache failures! + } + + // store it in the cache + CompressedImageCache_Add(imagename, maxsize, *buf, *size); + return (*buf != NULL); +}