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jpeg.c

/*
      Copyright (C) 2002  Mathieu Olivier

      This program is free software; you can redistribute it and/or
      modify it under the terms of the GNU General Public License
      as published by the Free Software Foundation; either version 2
      of the License, or (at your option) any later version.

      This program is distributed in the hope that it will be useful,
      but WITHOUT ANY WARRANTY; without even the implied warranty of
      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

      See the GNU General Public License for more details.

      You should have received a copy of the GNU General Public License
      along with this program; if not, write to:

            Free Software Foundation, Inc.
            59 Temple Place - Suite 330
            Boston, MA  02111-1307, USA

*/


#include "quakedef.h"
#include "image.h"
#include "jpeg.h"
#include "image_png.h"

cvar_t sv_writepicture_quality = {CVAR_SAVE, "sv_writepicture_quality", "10", "WritePicture quality offset (higher means better quality, but slower)"};
cvar_t r_texture_jpeg_fastpicmip = {CVAR_SAVE, "r_texture_jpeg_fastpicmip", "1", "perform gl_picmip during decompression for JPEG files (faster)"};

// jboolean is unsigned char instead of int on Win32
#ifdef WIN32
typedef unsigned char jboolean;
#else
typedef int jboolean;
#endif

#ifdef LINK_TO_LIBJPEG
#include <jpeglib.h>
#define qjpeg_create_compress jpeg_create_compress
#define qjpeg_create_decompress jpeg_create_decompress
#define qjpeg_destroy_compress jpeg_destroy_compress
#define qjpeg_destroy_decompress jpeg_destroy_decompress
#define qjpeg_finish_compress jpeg_finish_compress
#define qjpeg_finish_decompress jpeg_finish_decompress
#define qjpeg_resync_to_restart jpeg_resync_to_restart
#define qjpeg_read_header jpeg_read_header
#define qjpeg_read_scanlines jpeg_read_scanlines
#define qjpeg_set_defaults jpeg_set_defaults
#define qjpeg_set_quality jpeg_set_quality
#define qjpeg_start_compress jpeg_start_compress
#define qjpeg_start_decompress jpeg_start_decompress
#define qjpeg_std_error jpeg_std_error
#define qjpeg_write_scanlines jpeg_write_scanlines
#define qjpeg_simple_progression jpeg_simple_progression
#define jpeg_dll true
#else
/*
=================================================================

  Minimal set of definitions from the JPEG lib

  WARNING: for a matter of simplicity, several pointer types are
  casted to "void*", and most enumerated values are not included

=================================================================
*/

typedef void *j_common_ptr;
typedef struct jpeg_compress_struct *j_compress_ptr;
typedef struct jpeg_decompress_struct *j_decompress_ptr;

#define JPEG_LIB_VERSION  62  // Version 6b

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     // lasts until master record is destroyed
#define JPOOL_IMAGE           1     // lasts until done with image/datastream

#define JPEG_EOI  0xD9  // EOI marker code

#define JMSG_STR_PARM_MAX  80

#define DCTSIZE2 64
#define NUM_QUANT_TBLS 4
#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

00105 struct jpeg_memory_mgr
{
  void* (*alloc_small) (j_common_ptr cinfo, int pool_id, size_t sizeofobject);
  void (*_reserve_space_for_alloc_large) (void *dummy, ...);
  void (*_reserve_space_for_alloc_sarray) (void *dummy, ...);
  void (*_reserve_space_for_alloc_barray) (void *dummy, ...);
  void (*_reserve_space_for_request_virt_sarray) (void *dummy, ...);
  void (*_reserve_space_for_request_virt_barray) (void *dummy, ...);
  void (*_reserve_space_for_realize_virt_arrays) (void *dummy, ...);
  void (*_reserve_space_for_access_virt_sarray) (void *dummy, ...);
  void (*_reserve_space_for_access_virt_barray) (void *dummy, ...);
  void (*_reserve_space_for_free_pool) (void *dummy, ...);
  void (*_reserve_space_for_self_destruct) (void *dummy, ...);

  long max_memory_to_use;
  long max_alloc_chunk;
};

00123 struct jpeg_error_mgr
{
      void (*error_exit) (j_common_ptr cinfo);
      void (*emit_message) (j_common_ptr cinfo, int msg_level);
      void (*output_message) (j_common_ptr cinfo);
      void (*format_message) (j_common_ptr cinfo, char * buffer);
      void (*reset_error_mgr) (j_common_ptr cinfo);
      int msg_code;
      union {
            int i[8];
            char s[JMSG_STR_PARM_MAX];
      } msg_parm;
      int trace_level;
      long num_warnings;
      const char * const * jpeg_message_table;
      int last_jpeg_message;
      const char * const * addon_message_table;
      int first_addon_message;
      int last_addon_message;
};

00144 struct jpeg_source_mgr
{
      const unsigned char *next_input_byte;
      size_t bytes_in_buffer;

      void (*init_source) (j_decompress_ptr cinfo);
      jboolean (*fill_input_buffer) (j_decompress_ptr cinfo);
      void (*skip_input_data) (j_decompress_ptr cinfo, long num_bytes);
      jboolean (*resync_to_restart) (j_decompress_ptr cinfo, int desired);
      void (*term_source) (j_decompress_ptr cinfo);
};

00156 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;

00221 struct jpeg_decompress_struct
{
      struct jpeg_error_mgr *err;         // USED
      struct jpeg_memory_mgr *mem;  // USED

      void *progress;
      void *client_data;
      jboolean is_decompressor;
      int global_state;

      struct jpeg_source_mgr *src;  // USED
      JDIMENSION image_width;             // USED
      JDIMENSION image_height;            // USED

      int num_components;
      J_COLOR_SPACE jpeg_color_space;
      J_COLOR_SPACE out_color_space;
      unsigned int scale_num, scale_denom;
      double output_gamma;
      jboolean buffered_image;
      jboolean raw_data_out;
      J_DCT_METHOD dct_method;
      jboolean do_fancy_upsampling;
      jboolean do_block_smoothing;
      jboolean quantize_colors;
      J_DITHER_MODE dither_mode;
      jboolean two_pass_quantize;
      int desired_number_of_colors;
      jboolean enable_1pass_quant;
      jboolean enable_external_quant;
      jboolean enable_2pass_quant;
      JDIMENSION output_width;

      JDIMENSION output_height;     // USED

      int out_color_components;

      int output_components;        // USED

      int rec_outbuf_height;
      int actual_number_of_colors;
      void *colormap;

      JDIMENSION output_scanline;   // USED

      int input_scan_number;
      JDIMENSION input_iMCU_row;
      int output_scan_number;
      JDIMENSION output_iMCU_row;
      int (*coef_bits)[DCTSIZE2];
      void *quant_tbl_ptrs[NUM_QUANT_TBLS];
      void *dc_huff_tbl_ptrs[NUM_HUFF_TBLS];
      void *ac_huff_tbl_ptrs[NUM_HUFF_TBLS];
      int data_precision;
      jpeg_component_info *comp_info;
      jboolean progressive_mode;
      jboolean arith_code;
      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;
      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;
      unsigned char Adobe_transform;
      jboolean CCIR601_sampling;
      void *marker_list;
      int max_h_samp_factor;
      int max_v_samp_factor;
      int min_DCT_scaled_size;
      JDIMENSION total_iMCU_rows;
      void *sample_range_limit;
      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[D_MAX_BLOCKS_IN_MCU];
      int Ss, Se, Ah, Al;
      int unread_marker;
      void *master;
      void *main;
      void *coef;
      void *post;
      void *inputctl;
      void *marker;
      void *entropy;
      void *idct;
      void *upsample;
      void *cconvert;
      void *cquantize;
};


00319 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;
};

00392 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);
};


/*
=================================================================

  DarkPlaces definitions

=================================================================
*/

// 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, 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 void (*qjpeg_simple_progression) (j_compress_ptr cinfo);

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},
      {"jpeg_simple_progression",   (void **) &qjpeg_simple_progression},
      {NULL, NULL}
};

// Handle for JPEG DLL
dllhandle_t jpeg_dll = NULL;
qboolean jpeg_tried_loading = 0;
#endif

static unsigned char jpeg_eoi_marker [2] = {0xFF, JPEG_EOI};
static jmp_buf error_in_jpeg;
static qboolean jpeg_toolarge;

// Our own output manager for JPEG compression
00465 typedef struct
{
      struct jpeg_destination_mgr pub;

      qfile_t* outfile;
      unsigned char* buffer;
      size_t bufsize; // used if outfile is NULL
} my_destination_mgr;
typedef my_destination_mgr* my_dest_ptr;


/*
=================================================================

  DLL load & unload

=================================================================
*/

/*
====================
JPEG_OpenLibrary

Try to load the JPEG DLL
====================
*/
qboolean JPEG_OpenLibrary (void)
{
#ifdef LINK_TO_LIBJPEG
      return true;
#else
      const char* dllnames [] =
      {
#if 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;

      if (jpeg_tried_loading) // only try once
            return false;

      jpeg_tried_loading = true;

      // Load the DLL
      return Sys_LoadLibrary (dllnames, &jpeg_dll, jpegfuncs);
#endif
}


/*
====================
JPEG_CloseLibrary

Unload the JPEG DLL
====================
*/
void JPEG_CloseLibrary (void)
{
#ifndef LINK_TO_LIBJPEG
      Sys_UnloadLibrary (&jpeg_dll);
      jpeg_tried_loading = false; // allow retry
#endif
}


/*
=================================================================

      JPEG decompression

=================================================================
*/

static void JPEG_Noop (j_decompress_ptr cinfo) {}

static jboolean JPEG_FillInputBuffer (j_decompress_ptr cinfo)
{
    // Insert a fake EOI marker
    cinfo->src->next_input_byte = jpeg_eoi_marker;
    cinfo->src->bytes_in_buffer = 2;

      return TRUE;
}

static void JPEG_SkipInputData (j_decompress_ptr cinfo, long num_bytes)
{
    if (cinfo->src->bytes_in_buffer <= (unsigned long)num_bytes)
      {
            cinfo->src->bytes_in_buffer = 0;
            return;
      }

    cinfo->src->next_input_byte += num_bytes;
    cinfo->src->bytes_in_buffer -= num_bytes;
}

static void JPEG_MemSrc (j_decompress_ptr cinfo, const unsigned char *buffer, size_t filesize)
{
      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 = filesize;

      cinfo->src->init_source = JPEG_Noop;
      cinfo->src->fill_input_buffer = JPEG_FillInputBuffer;
      cinfo->src->skip_input_data = JPEG_SkipInputData;
      cinfo->src->resync_to_restart = qjpeg_resync_to_restart; // use the default method
      cinfo->src->term_source = JPEG_Noop;
}

static void JPEG_ErrorExit (j_common_ptr cinfo)
{
      ((struct jpeg_decompress_struct*)cinfo)->err->output_message (cinfo);
      longjmp(error_in_jpeg, 1);
}


/*
====================
JPEG_LoadImage

Load a JPEG image into a BGRA buffer
====================
*/
unsigned char* JPEG_LoadImage_BGRA (const unsigned char *f, int filesize, int *miplevel)
{
      struct jpeg_decompress_struct cinfo;
      struct jpeg_error_mgr jerr;
      unsigned char *image_buffer = NULL, *scanline = NULL;
      unsigned int line;
      int submip = 0;

      // No DLL = no JPEGs
      if (!jpeg_dll)
            return NULL;

      if(miplevel && r_texture_jpeg_fastpicmip.integer)
            submip = bound(0, *miplevel, 3);

      cinfo.err = qjpeg_std_error (&jerr);
      qjpeg_create_decompress (&cinfo);
      if(setjmp(error_in_jpeg))
            goto error_caught;
      cinfo.err = qjpeg_std_error (&jerr);
      cinfo.err->error_exit = JPEG_ErrorExit;
      JPEG_MemSrc (&cinfo, f, filesize);
      qjpeg_read_header (&cinfo, TRUE);
      cinfo.scale_num = 1;
      cinfo.scale_denom = (1 << submip);
      qjpeg_start_decompress (&cinfo);

      image_width = cinfo.output_width;
      image_height = cinfo.output_height;

      if (image_width > 32768 || image_height > 32768 || image_width <= 0 || image_height <= 0)
      {
            Con_Printf("JPEG_LoadImage: invalid image size %ix%i\n", image_width, image_height);
            return NULL;
      }

      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_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);
            qjpeg_destroy_decompress (&cinfo);
            return NULL;
      }

      // Decompress the image, line by line
      line = 0;
      while (cinfo.output_scanline < cinfo.output_height)
      {
            unsigned char *buffer_ptr;
            int ind;

            qjpeg_read_scanlines (&cinfo, &scanline, 1);

            // Convert the image to BGRA
            switch (cinfo.output_components)
            {
                  // RGB images
                  case 3:
                        buffer_ptr = &image_buffer[image_width * line * 4];
                        for (ind = 0; ind < image_width * 3; ind += 3, buffer_ptr += 4)
                        {
                              buffer_ptr[2] = scanline[ind];
                              buffer_ptr[1] = scanline[ind + 1];
                              buffer_ptr[0] = scanline[ind + 2];
                              buffer_ptr[3] = 255;
                        }
                        break;

                  // Greyscale images (default to it, just in case)
                  case 1:
                  default:
                        buffer_ptr = &image_buffer[image_width * line * 4];
                        for (ind = 0; ind < image_width; ind++, buffer_ptr += 4)
                        {
                              buffer_ptr[0] = scanline[ind];
                              buffer_ptr[1] = scanline[ind];
                              buffer_ptr[2] = scanline[ind];
                              buffer_ptr[3] = 255;
                        }
            }

            line++;
      }
      Mem_Free (scanline); scanline = NULL;

      qjpeg_finish_decompress (&cinfo);
      qjpeg_destroy_decompress (&cinfo);

      if(miplevel)
            *miplevel -= submip;

      return image_buffer;

error_caught:
      if(scanline)
            Mem_Free (scanline);
      if(image_buffer)
            Mem_Free (image_buffer);
      qjpeg_destroy_decompress (&cinfo);
      return NULL;
}


/*
=================================================================

  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)
            longjmp(error_in_jpeg, 1);

      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)
                  longjmp(error_in_jpeg, 1);
}

static void JPEG_FileDest (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;
}

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)
{
      my_dest_ptr dest = (my_dest_ptr)cinfo->dest;
      jpeg_toolarge = true;
      dest->pub.next_output_byte = dest->buffer;
      dest->pub.free_in_buffer = dest->bufsize;
      return true;
}

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 = (unsigned char *) buf;
      dest->bufsize = bufsize;
}


/*
====================
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_OpenRealFile(filename, "wb", true);
      if (!file)
            return false;

      if(setjmp(error_in_jpeg))
            goto error_caught;
      cinfo.err = qjpeg_std_error (&jerr);
      cinfo.err->error_exit = JPEG_ErrorExit;

      qjpeg_create_compress (&cinfo);
      JPEG_FileDest (&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);
      qjpeg_simple_progression (&cinfo);

      // 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);
      }

      qjpeg_finish_compress (&cinfo);
      qjpeg_destroy_compress (&cinfo);

      FS_Close (file);
      return true;

error_caught:
      qjpeg_destroy_compress (&cinfo);
      FS_Close (file);
      return false;
}

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;

      jpeg_toolarge = 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;
      while (cinfo->next_scanline < cinfo->image_height)
      {
            scanline = &data[cinfo->next_scanline * linesize];

            qjpeg_write_scanlines (cinfo, &scanline, 1);
      }

      qjpeg_finish_compress (cinfo);

      if(jpeg_toolarge)
            return 0;

      return ((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;
      }

      if(setjmp(error_in_jpeg))
            goto error_caught;
      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/Xonotic's map pictures

      quality_guess = bound(0, quality_guess, 100);
      quality = bound(0, quality_guess + sv_writepicture_quality.integer, 100); // 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;
            }
      }
      qjpeg_destroy_compress (&cinfo);
      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;

error_caught:
      qjpeg_destroy_compress (&cinfo);
      return 0;
}

00992 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 = (CompressedImageCacheItem*) 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;
            i = i->next;
      }
      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};
      CompressedImageCacheItem *i;

      JPEG_OpenLibrary (); // for now; LH had the idea of replacing this by a better format
      PNG_OpenLibrary (); // for loading

      // No DLL = no JPEGs
      if (!jpeg_dll)
      {
            Con_Print("You need the libjpeg library to save JPEG images\n");
            return false;
      }

      i = CompressedImageCache_Find(imagename, maxsize);
      if(i)
      {
            *size = i->compressed_size;
            *buf = i->compressed;
      }

      // load the image
      imagedata = loadimagepixelsbgra(imagename, true, false, false, NULL);
      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 = (unsigned char *) 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((char *) *buf, maxsize, image_width, image_height, newimagedata);
      Mem_Free(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);
}

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