added jpeg3 extraction support to swfextract

[swftools.git] / lib / jpeg.c

diff --git a/lib/jpeg.c b/lib/jpeg.c
index b0059b8..21cc0f7 100644 (file)
--- a/lib/jpeg.c
+++ b/lib/jpeg.c
@@ -124,6 +124,45 @@ int jpeg_save(unsigned char*data, int width, int height, int quality, const char
   return 1;
 }
 
+int jpeg_save_gray(unsigned char*data, int width, int height, int quality, const char*filename)
+{
+  struct jpeg_destination_mgr mgr;
+  struct jpeg_compress_struct cinfo;
+  struct jpeg_error_mgr jerr;
+
+  if(filename) fi = fopen(filename, "wb");
+  else         fi = 0;
+
+  memset(&cinfo, 0, sizeof(cinfo));
+  memset(&jerr, 0, sizeof(jerr));
+  memset(&mgr, 0, sizeof(mgr));
+  cinfo.err = jpeg_std_error(&jerr);
+  jpeg_create_compress(&cinfo);
+
+  mgr.init_destination = file_init_destination;
+  mgr.empty_output_buffer = file_empty_output_buffer;
+  mgr.term_destination = file_term_destination;
+  cinfo.dest = &mgr;
+  cinfo.image_width  = width;
+  cinfo.image_height = height;
+  cinfo.input_components = 1;
+  cinfo.in_color_space = JCS_GRAYSCALE;
+  jpeg_set_defaults(&cinfo);
+  jpeg_set_quality(&cinfo,quality,TRUE);
+  jpeg_start_compress(&cinfo, FALSE);
+  int t;
+  for(t=0;t<height;t++) {
+    unsigned char*data2 = &data[width*t];
+    jpeg_write_scanlines(&cinfo, &data2, 1);
+  }
+  jpeg_finish_compress(&cinfo);
+
+  if(fi) fclose(fi);
+  jpeg_destroy_compress(&cinfo);
+  return 1;
+}
+
+
 int jpeg_save_to_file(unsigned char*data, int width, int height, int quality, FILE*_fi)
 {
   struct jpeg_destination_mgr mgr;
@@ -227,7 +266,7 @@ boolean mem_fill_input_buffer (j_decompress_ptr cinfo)
 void mem_skip_input_data (j_decompress_ptr cinfo, long num_bytes)
 {
     struct jpeg_source_mgr* mgr = cinfo->src;
-    printf("skip %d +%d\n", size - mgr->bytes_in_buffer, num_bytes);
+    printf("skip %d +%ld\n", size - mgr->bytes_in_buffer, num_bytes);
     if(num_bytes<=0)
        return;
     mgr->next_input_byte += num_bytes;
@@ -249,12 +288,11 @@ void mem_term_source (j_decompress_ptr cinfo)
     //printf("term %d\n", size - mgr->bytes_in_buffer);
 }
 
-int jpeg_load_from_mem(unsigned char*_data, int _size, unsigned char*dest, int width, int height)
+int jpeg_load_from_mem(unsigned char*_data, int _size, unsigned char**dest, int*width, int*height)
 {
     struct jpeg_decompress_struct cinfo;
     struct jpeg_error_mgr jerr;
     struct jpeg_source_mgr mgr;
-    int y,x;
 
     data = _data;
     size = _size;
@@ -273,12 +311,27 @@ int jpeg_load_from_mem(unsigned char*_data, int _size, unsigned char*dest, int w
     cinfo.src = &mgr;
 
     jpeg_read_header(&cinfo, TRUE);
+    cinfo.out_color_space == JCS_RGB;
     jpeg_start_decompress(&cinfo);
+  
+    *width = cinfo.output_width;
+    *height = cinfo.output_height;
+    *dest = malloc(cinfo.output_width * cinfo.output_height * 4); 
 
-    for(y=0;y<height;y++) {
-       unsigned char*j = &dest[width*y*3];
-       jpeg_read_scanlines(&cinfo,&j,1);
+    unsigned char*scanline = malloc(cinfo.output_width * 4);
+    int y;
+    for(y=0;y<cinfo.output_height;y++) {
+       unsigned char*to = &(*dest)[cinfo.output_width*y*4];
+       jpeg_read_scanlines(&cinfo,&scanline,1);
+       int x;
+       for(x=0;x<cinfo.output_width;x++) {
+           to[x*4 + 0] = 255;
+           to[x*4 + 1] = scanline[x*3 + 0];
+           to[x*4 + 2] = scanline[x*3 + 1];
+           to[x*4 + 3] = scanline[x*3 + 2];
+       }
     }
+    free(scanline);
 
     jpeg_finish_decompress(&cinfo);
     jpeg_destroy_decompress(&cinfo);
@@ -313,7 +366,7 @@ int jpeg_load(const char*filename, unsigned char**dest, int*_width, int*_height)
 
     int width = *_width = cinfo.output_width;
     int height = *_height = cinfo.output_height;
-    *dest = malloc(width*height*4);
+    *dest = (unsigned char*)malloc(width*height*4);
 
     int y;
     for (y=0;y<height;y++) {
@@ -362,9 +415,33 @@ int jpeg_load(const char*filename, unsigned char**dest, int*_width, int*_height)
 
     jpeg_finish_decompress(&cinfo);
     jpeg_destroy_decompress(&cinfo);
+    fclose(fi);
     return 1;
 }
 
+void jpeg_get_size(const char *filename, int *width, int *height)
+{
+    struct jpeg_decompress_struct cinfo;
+    struct jpeg_error_mgr jerr;
+    FILE *fi;
+    *width = 0;
+    *height = 0;
+    cinfo.err = jpeg_std_error(&jerr);
+    cinfo.image_width = 0;
+    cinfo.image_height = 0;
+    jpeg_create_decompress(&cinfo);
+    if ((fi = fopen(filename, "rb")) == NULL) {
+       fprintf(stderr, "couldn't open %s\n", filename);
+       return;
+    }
+    jpeg_stdio_src(&cinfo, fi);
+    jpeg_read_header(&cinfo, TRUE);
+    *width = cinfo.image_width;
+    *height = cinfo.image_height;
+    jpeg_destroy_decompress(&cinfo);
+    fclose(fi);
+}
+
 #else
 
 int jpeg_save(unsigned char*data, int width, int height, int quality, const char*filename)
@@ -392,5 +469,11 @@ int jpeg_load(const char*filename, unsigned char**dest, int*_width, int*_height)
     fprintf(stderr, "jpeg_load: No JPEG support compiled in\n");
     return 0;
 }
+void jpeg_get_size(const char *fname, int *width, int *height)
+{
+    *width = 0;
+    *height = 0;
+    fprintf(stderr, "jpeg_get_size: No JPEG support compiled in\n");
+}
 
 #endif