added 3dengfx into the repo, probably not the correct version for this

[summerhack] / src / 3dengfx / src / gfx / image_jpg.c

diff --git a/src/3dengfx/src/gfx/image_jpg.c b/src/3dengfx/src/gfx/image_jpg.c
new file mode 100644 (file)
index 0000000..02e7ab2
--- /dev/null
+++ b/src/3dengfx/src/gfx/image_jpg.c
@@ -0,0 +1,130 @@
+/*
+Copyright 2004 John Tsiombikas <nuclear@siggraph.org>
+
+This is a small image library.
+
+This library 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 library 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 library; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*/
+
+/* jpeg support
+ * 
+ * author: Mihalis Georgoulopoulos 2004
+ * modified: John Tsiombikas 2004
+ */
+
+#include "3dengfx_config.h"
+#include "image.h"
+#include <stdio.h>
+
+#ifdef IMGLIB_USE_JPEG
+
+#include <stdlib.h>
+
+#ifdef WIN32
+#include <windows.h>
+#define HAVE_BOOLEAN
+#endif
+
+#include <jpeglib.h>
+#include "color_bits.h"
+
+typedef struct
+{
+       unsigned char r,g,b;
+} RGBTriplet;
+
+/*jpeg signature*/
+int check_jpeg(FILE *fp){
+       unsigned char sig[10];
+
+       fseek(fp, 0, SEEK_SET);
+       fread(sig, 1, 10, fp);
+       
+    if(sig[0]!=0xff || sig[1]!=0xd8 || sig[2]!=0xff || sig[3]!=0xe0) {
+               return 0;
+       }
+
+       if(/*sig[6]!='J' ||*/sig[7]!='F' || sig[8]!='I' || sig[9]!='F') {
+               return 0;
+       }
+       
+    return 1;
+}
+
+void *load_jpeg(FILE *fp, unsigned long *xsz, unsigned long *ysz) {
+       int i;
+       RGBTriplet *buffer;
+       uint32_t *image;
+       
+       JSAMPLE *tmp;
+    
+       struct jpeg_decompress_struct cinfo;
+       struct jpeg_error_mgr jerr;
+       cinfo.err = jpeg_std_error(&jerr);
+       
+       fseek(fp, 0, SEEK_SET);
+
+       jpeg_create_decompress(&cinfo);
+       jpeg_stdio_src(&cinfo, fp);
+       
+       jpeg_read_header(&cinfo, TRUE);
+       
+       /* force output to rgb */
+       cinfo.out_color_space = JCS_RGB;
+       
+    /* allocate space */
+    buffer = malloc(cinfo.image_width * sizeof(RGBTriplet));
+    if (!buffer) return 0;
+    image = malloc(cinfo.image_width * (cinfo.image_height) * sizeof(uint32_t));
+    if (!image) return 0;
+    
+    tmp = (JSAMPLE*) buffer;
+
+       /* return w and h */
+       *xsz = cinfo.image_width;
+       *ysz = cinfo.image_height;
+    
+       /* Decompress, pack and store */
+    jpeg_start_decompress(&cinfo);
+    {
+        while (cinfo.output_scanline < cinfo.output_height) 
+        {
+            jpeg_read_scanlines(&cinfo, &tmp, 1);
+                       if (cinfo.output_scanline == 0) continue;
+            
+            for (i=0;i<cinfo.image_width;i++)
+            {
+                               int offs = i + (cinfo.output_scanline-1) * cinfo.output_width;
+                image[offs] = PACK_COLOR24(buffer[i].r, buffer[i].g, buffer[i].b);
+            }
+        }
+    }
+    jpeg_finish_decompress(&cinfo);
+       
+       /*Done - cleanup*/
+       jpeg_destroy_decompress(&cinfo);
+       free(buffer);
+       fclose(fp);
+
+       return (void*) image;
+}
+
+/* TODO: implement this */
+int save_jpeg(FILE *fp, void *pixels, unsigned long xsz, unsigned long ysz) {
+       fprintf(stderr, "saving jpeg files is not implemented yet\n");
+       return -1;
+}
+
+#endif /* IMGLIB_USE_JPEG */