X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?a=blobdiff_plain;f=src%2F3dengfx%2Fsrc%2Fgfx%2Fimage_jpg.c;fp=src%2F3dengfx%2Fsrc%2Fgfx%2Fimage_jpg.c;h=02e7ab2cee79453aa5da0a6d3a8448f61e9604a1;hb=6e23259dbabaeb1711a2a5ca25b9cb421f693759;hp=0000000000000000000000000000000000000000;hpb=fe068fa879814784c45e0cb2e65dac489e8f5594;p=summerhack

diff --git a/src/3dengfx/src/gfx/image_jpg.c b/src/3dengfx/src/gfx/image_jpg.c
new file mode 100644
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 */