X-Git-Url: http://git.xonotic.org/?a=blobdiff_plain;ds=sidebyside;f=jpeg.c;h=28904b11a19c4a78d154d9e3599439ee0e6a8897;hb=9a685b43f18f4744e718ddfc1429701fa377465d;hp=3519ab19d28cdecf3074b314bc4337326c9f2e6e;hpb=57252d1b300d96b2353bf9d564b0de281552d2c5;p=xonotic%2Fdarkplaces.git diff --git a/jpeg.c b/jpeg.c index 3519ab19..28904b11 100644 --- a/jpeg.c +++ b/jpeg.c @@ -23,8 +23,10 @@ #include "quakedef.h" +#include "image.h" #include "jpeg.h" + /* ================================================================= @@ -36,9 +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 @@ -46,13 +48,23 @@ typedef int jboolean; #define JPEG_LIB_VERSION 62 // Version 6b typedef void *j_common_ptr; +typedef struct jpeg_compress_struct *j_compress_ptr; typedef struct jpeg_decompress_struct *j_decompress_ptr; -typedef enum {JPEG_DUMMY1} J_COLOR_SPACE; -typedef enum {JPEG_DUMMY2} J_DCT_METHOD; -typedef enum {JPEG_DUMMY3} J_DITHER_MODE; +typedef enum +{ + JCS_UNKNOWN, + JCS_GRAYSCALE, + JCS_RGB, + JCS_YCbCr, + JCS_CMYK, + JCS_YCCK +} J_COLOR_SPACE; +typedef enum {JPEG_DUMMY1} J_DCT_METHOD; +typedef enum {JPEG_DUMMY2} J_DITHER_MODE; typedef unsigned int JDIMENSION; -#define JPOOL_PERMANENT 0 +#define JPOOL_PERMANENT 0 // lasts until master record is destroyed +#define JPOOL_IMAGE 1 // lasts until done with image/datastream #define JPEG_EOI 0xD9 // EOI marker code @@ -63,6 +75,7 @@ typedef unsigned int JDIMENSION; #define NUM_HUFF_TBLS 4 #define NUM_ARITH_TBLS 16 #define MAX_COMPS_IN_SCAN 4 +#define C_MAX_BLOCKS_IN_MCU 10 #define D_MAX_BLOCKS_IN_MCU 10 struct jpeg_memory_mgr @@ -106,7 +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); @@ -116,6 +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 @@ -170,21 +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; @@ -193,7 +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; @@ -214,6 +292,90 @@ struct jpeg_decompress_struct }; +struct jpeg_compress_struct +{ + struct jpeg_error_mgr *err; + struct jpeg_memory_mgr *mem; + void *progress; + void *client_data; + jboolean is_decompressor; + int global_state; + + void *dest; + JDIMENSION image_width; + JDIMENSION image_height; + int input_components; + J_COLOR_SPACE in_color_space; + double input_gamma; + int data_precision; + + int num_components; + J_COLOR_SPACE jpeg_color_space; + 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]; + 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; + jboolean raw_data_in; + jboolean arith_code; + jboolean optimize_coding; + jboolean CCIR601_sampling; + int smoothing_factor; + J_DCT_METHOD dct_method; + + unsigned int restart_interval; + int restart_in_rows; + + jboolean write_JFIF_header; + 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; + JDIMENSION next_scanline; + + jboolean progressive_mode; + int max_h_samp_factor; + int max_v_samp_factor; + JDIMENSION total_iMCU_rows; + int 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; + int MCU_membership[C_MAX_BLOCKS_IN_MCU]; + int Ss, Se, Ah, Al; + + void *master; + void *main; + void *prep; + void *coef; + void *marker; + void *cconvert; + void *downsample; + void *fdct; + void *entropy; + void *script_space; + int script_space_size; +}; + +struct jpeg_destination_mgr +{ + unsigned char* next_output_byte; + size_t free_in_buffer; + + void (*init_destination) (j_compress_ptr cinfo); + jboolean (*empty_output_buffer) (j_compress_ptr cinfo); + void (*term_destination) (j_compress_ptr cinfo); +}; + + /* ================================================================= @@ -223,30 +385,62 @@ struct jpeg_decompress_struct */ // Functions exported from libjpeg +#define qjpeg_create_compress(cinfo) \ + qjpeg_CreateCompress((cinfo), JPEG_LIB_VERSION, (size_t) sizeof(struct jpeg_compress_struct)) +#define qjpeg_create_decompress(cinfo) \ + qjpeg_CreateDecompress((cinfo), JPEG_LIB_VERSION, (size_t) sizeof(struct jpeg_decompress_struct)) + +static void (*qjpeg_CreateCompress) (j_compress_ptr cinfo, int version, size_t structsize); static void (*qjpeg_CreateDecompress) (j_decompress_ptr cinfo, int version, size_t structsize); +static void (*qjpeg_destroy_compress) (j_compress_ptr cinfo); static void (*qjpeg_destroy_decompress) (j_decompress_ptr cinfo); +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, unsigned char** scanlines, JDIMENSION num_lines); static dllfunction_t jpegfuncs[] = { + {"jpeg_CreateCompress", (void **) &qjpeg_CreateCompress}, {"jpeg_CreateDecompress", (void **) &qjpeg_CreateDecompress}, + {"jpeg_destroy_compress", (void **) &qjpeg_destroy_compress}, {"jpeg_destroy_decompress", (void **) &qjpeg_destroy_decompress}, + {"jpeg_finish_compress", (void **) &qjpeg_finish_compress}, {"jpeg_finish_decompress", (void **) &qjpeg_finish_decompress}, {"jpeg_resync_to_restart", (void **) &qjpeg_resync_to_restart}, {"jpeg_read_header", (void **) &qjpeg_read_header}, {"jpeg_read_scanlines", (void **) &qjpeg_read_scanlines}, + {"jpeg_set_defaults", (void **) &qjpeg_set_defaults}, + {"jpeg_set_quality", (void **) &qjpeg_set_quality}, + {"jpeg_start_compress", (void **) &qjpeg_start_compress}, {"jpeg_start_decompress", (void **) &qjpeg_start_decompress}, {"jpeg_std_error", (void **) &qjpeg_std_error}, + {"jpeg_write_scanlines", (void **) &qjpeg_write_scanlines}, {NULL, NULL} }; // Handle for JPEG DLL -static dllhandle_t jpeg_dll = NULL; +dllhandle_t jpeg_dll = NULL; + +static unsigned char jpeg_eoi_marker [2] = {0xFF, JPEG_EOI}; +static qboolean error_in_jpeg; + +// Our own output manager for JPEG compression +typedef struct +{ + struct jpeg_destination_mgr pub; + + qfile_t* outfile; + unsigned char* buffer; +} my_destination_mgr; +typedef my_destination_mgr* my_dest_ptr; /* @@ -266,41 +460,27 @@ Try to load the JPEG DLL */ qboolean JPEG_OpenLibrary (void) { - const char* dllname; - const dllfunction_t *func; + const char* dllnames [] = + { +#if defined(WIN64) + "libjpeg64.dll", +#elif defined(WIN32) + "libjpeg.dll", +#elif defined(MACOSX) + "libjpeg.62.dylib", +#else + "libjpeg.so.62", + "libjpeg.so", +#endif + NULL + }; // Already loaded? if (jpeg_dll) return true; -#ifdef WIN32 - dllname = "libjpeg.dll"; -#else - dllname = "libjpeg.so.62"; -#endif - - // Initializations - for (func = jpegfuncs; func && func->name != NULL; func++) - *func->funcvariable = NULL; - // Load the DLL - if (! (jpeg_dll = Sys_LoadLibrary (dllname))) - { - Con_Printf("Can't find %s. JPEG support disabled\n", dllname); - return false; - } - - // Get the function adresses - for (func = jpegfuncs; func && func->name != NULL; func++) - if (!(*func->funcvariable = (void *) Sys_GetProcAddress (jpeg_dll, func->name))) - { - Con_Printf("missing function \"%s\" - broken JPEG library!\n", func->name); - JPEG_CloseLibrary (); - return false; - } - - Con_Printf("%s loaded. JPEG support enabled\n", dllname); - return true; + return Sys_LoadLibrary (dllnames, &jpeg_dll, jpegfuncs); } @@ -313,24 +493,18 @@ Unload the JPEG DLL */ void JPEG_CloseLibrary (void) { - if (!jpeg_dll) - return; - - Sys_UnloadLibrary (jpeg_dll); - jpeg_dll = NULL; + Sys_UnloadLibrary (&jpeg_dll); } /* ================================================================= - Functions for handling JPEG images + JPEG decompression ================================================================= */ -static qbyte jpeg_eoi_marker [2] = {0xFF, JPEG_EOI}; - static void JPEG_Noop (j_decompress_ptr cinfo) {} static jboolean JPEG_FillInputBuffer (j_decompress_ptr cinfo) @@ -354,12 +528,12 @@ 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, 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; @@ -368,19 +542,25 @@ static void JPEG_MemSrc (j_decompress_ptr cinfo, qbyte *buffer) cinfo->src->term_source = JPEG_Noop; } +static void JPEG_ErrorExit (j_common_ptr cinfo) +{ + ((struct jpeg_decompress_struct*)cinfo)->err->output_message (cinfo); + error_in_jpeg = true; +} + /* ==================== JPEG_LoadImage -Load a JPEG image into a RGBA buffer +Load a JPEG image into a BGRA buffer ==================== */ -qbyte* JPEG_LoadImage (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 @@ -388,27 +568,28 @@ qbyte* JPEG_LoadImage (qbyte *f, int matchwidth, int matchheight) return NULL; cinfo.err = qjpeg_std_error (&jerr); - qjpeg_CreateDecompress (&cinfo, JPEG_LIB_VERSION, (size_t) sizeof(struct jpeg_decompress_struct)); - JPEG_MemSrc (&cinfo, f); + qjpeg_create_decompress (&cinfo); + 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)) + if (image_width > 4096 || image_height > 4096 || image_width <= 0 || image_height <= 0) { - qjpeg_finish_decompress (&cinfo); - qjpeg_destroy_decompress (&cinfo); + 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); @@ -420,22 +601,22 @@ qbyte* JPEG_LoadImage (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; @@ -443,7 +624,7 @@ qbyte* JPEG_LoadImage (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]; @@ -460,5 +641,137 @@ qbyte* JPEG_LoadImage (qbyte *f, int matchwidth, int matchheight) qjpeg_finish_decompress (&cinfo); qjpeg_destroy_decompress (&cinfo); - return image_rgba; + return image_buffer; +} + + +/* +================================================================= + + JPEG compression + +================================================================= +*/ + +#define JPEG_OUTPUT_BUF_SIZE 4096 +static void JPEG_InitDestination (j_compress_ptr cinfo) +{ + my_dest_ptr dest = (my_dest_ptr)cinfo->dest; + 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; +} + +static jboolean JPEG_EmptyOutputBuffer (j_compress_ptr cinfo) +{ + my_dest_ptr dest = (my_dest_ptr)cinfo->dest; + + if (FS_Write (dest->outfile, dest->buffer, JPEG_OUTPUT_BUF_SIZE) != (size_t) JPEG_OUTPUT_BUF_SIZE) + { + error_in_jpeg = true; + return false; + } + + dest->pub.next_output_byte = dest->buffer; + dest->pub.free_in_buffer = JPEG_OUTPUT_BUF_SIZE; + return true; +} + +static void JPEG_TermDestination (j_compress_ptr cinfo) +{ + my_dest_ptr dest = (my_dest_ptr)cinfo->dest; + size_t datacount = JPEG_OUTPUT_BUF_SIZE - dest->pub.free_in_buffer; + + // Write any data remaining in the buffer + if (datacount > 0) + if (FS_Write (dest->outfile, dest->buffer, datacount) != (fs_offset_t)datacount) + error_in_jpeg = true; +} + +static void JPEG_MemDest (j_compress_ptr cinfo, qfile_t* outfile) +{ + 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_InitDestination; + dest->pub.empty_output_buffer = JPEG_EmptyOutputBuffer; + dest->pub.term_destination = JPEG_TermDestination; + dest->outfile = outfile; +} + + +/* +==================== +JPEG_SaveImage_preflipped + +Save a preflipped JPEG image to a file +==================== +*/ +qboolean JPEG_SaveImage_preflipped (const char *filename, int width, int height, unsigned char *data) +{ + struct jpeg_compress_struct cinfo; + struct jpeg_error_mgr jerr; + unsigned char *scanline; + unsigned int offset, linesize; + qfile_t* file; + + // No DLL = no JPEGs + if (!jpeg_dll) + { + Con_Print("You need the libjpeg library to save JPEG images\n"); + return false; + } + + // Open the file + file = FS_Open (filename, "wb", true, false); + if (!file) + return false; + + cinfo.err = qjpeg_std_error (&jerr); + cinfo.err->error_exit = JPEG_ErrorExit; + error_in_jpeg = false; + + qjpeg_create_compress (&cinfo); + JPEG_MemDest (&cinfo, file); + + // 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, (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 + linesize = cinfo.image_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); + qjpeg_destroy_compress (&cinfo); + + FS_Close (file); + return true; }