+
+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 = (int)((100 * jpegsize - 41000) / (width*height) + 2); // fits random data
+ quality_guess = (int)((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;
+}
+
+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)
+{
+ char vabuf[1024];
+ const char *hashkey = va(vabuf, sizeof(vabuf), "%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)
+{
+ char vabuf[1024];
+ const char *hashkey = va(vabuf, sizeof(vabuf), "%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;
+}
+
+qbool 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;
+ return (*buf != NULL);
+ }
+
+ // 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);