Minor reorg in the JPEG codec.

git-svn-id: file:///srv/caca.zoy.org/var/lib/svn/libpipi/trunk@3344 92316355-f0b4-4df1-b90c-862c8a59935f

pipi/codec/jpeg.c

@@ -32,7 +32,8 @@
 
 static int pipi_free_jpeg(pipi_image_t *img);
 
-struct my_error_mgr {
+struct my_error_mgr
+{
     struct jpeg_error_mgr pub;
     jmp_buf setjmp_buffer;
 };
@@ -42,15 +43,18 @@ typedef struct my_error_mgr * my_error_ptr;
 static void format_msg(j_common_ptr cinfo, char *buf)
 {
 }
+
 static void emit_msg(j_common_ptr cinfo, int level)
 {
 }
+
 static void error_msg(j_common_ptr cinfo)
 {
     my_error_ptr myerr = (my_error_ptr) cinfo->err;
     cinfo->client_data = (void*)0x1;
     longjmp(myerr->setjmp_buffer, 1);
 }
+
 static void output_msg(j_common_ptr cinfo)
 {
 }
@@ -65,12 +69,12 @@ pipi_image_t *pipi_load_jpeg(const char *name)
     FILE *fp;
 
     fp = fopen(name, "rb");
-    if(!fp) goto end;
-
+    if(!fp)
+        goto end;
 
-    if (setjmp(jerr.setjmp_buffer)) {
+    if(setjmp(jerr.setjmp_buffer))
         goto end;
-    }
+
     cinfo.err = jpeg_std_error(&jerr.pub);
     jerr.pub.error_exit = error_msg;
     jerr.pub.emit_message = emit_msg;
@@ -81,40 +85,38 @@ pipi_image_t *pipi_load_jpeg(const char *name)
     jpeg_create_decompress(&cinfo);
     cinfo.client_data = 0x0;
     jpeg_stdio_src(&cinfo, fp);
-    if(cinfo.client_data == (void *)0x1) {
+    if(cinfo.client_data == (void *)0x1)
         goto end;
-    }
     jpeg_read_header(&cinfo, TRUE);
-    if(cinfo.client_data == (void *)0x1) {
+    if(cinfo.client_data == (void *)0x1)
         goto end;
-    }
     jpeg_start_decompress(&cinfo);
-    if(cinfo.client_data == (void *)0x1) {
+    if(cinfo.client_data == (void *)0x1)
         goto end;
-    }
 
     /* One scanline */
     image = malloc(cinfo.output_width * cinfo.output_height * 4);
-    if(!image) goto end;
+    if(!image)
+        goto end;
 
     scanline = malloc(cinfo.output_width * 3);
 
-
-    for(i=0; i < cinfo.output_height; i++)
+    for(i = 0; i < cinfo.output_height; i++)
     {
         jpeg_read_scanlines(&cinfo, &scanline, 1);
-        if(cinfo.client_data == (void *)0x1) {
+        if(cinfo.client_data == (void *)0x1)
+        {
             free(img);
             img = NULL;
             goto end;
         }
-        for(j=0 ; j<cinfo.output_width*3; j+=3)
+        for(j = 0; j < cinfo.output_width * 3; j += 3)
         {
-            image[k+2] = scanline[j];
-            image[k+1] = scanline[j+1];
-            image[k]   = scanline[j+2];
-            image[k+3] = 255;
-            k+=4;
+            image[k + 2] = scanline[j];
+            image[k + 1] = scanline[j + 1];
+            image[k]     = scanline[j + 2];
+            image[k + 3] = 255;
+            k += 4;
         }
     }
 
@@ -123,7 +125,7 @@ pipi_image_t *pipi_load_jpeg(const char *name)
     img->p[PIPI_PIXELS_RGBA_U8].pixels = image;
     img->p[PIPI_PIXELS_RGBA_U8].w = cinfo.output_width;
     img->p[PIPI_PIXELS_RGBA_U8].h = cinfo.output_height;
-    img->p[PIPI_PIXELS_RGBA_U8].pitch = cinfo.output_width*4;
+    img->p[PIPI_PIXELS_RGBA_U8].pitch = cinfo.output_width * 4;
     img->p[PIPI_PIXELS_RGBA_U8].bpp = 24;
     img->p[PIPI_PIXELS_RGBA_U8].bytes = 4 * img->w * img->h;
     img->last_modified = PIPI_PIXELS_RGBA_U8;
@@ -136,22 +138,29 @@ pipi_image_t *pipi_load_jpeg(const char *name)
     img->u8 = 1;
 
 end:
-    if(fp) fclose(fp);
-    if(scanline) free(scanline);
+    if(fp)
+        fclose(fp);
+    if(scanline)
+        free(scanline);
     jpeg_destroy_decompress(&cinfo);
     return img;
 }
 
 int pipi_save_jpeg(pipi_image_t *img, const char *name)
 {
-    int quality = 75; /* FIXME */
-
     struct jpeg_compress_struct cinfo;
     struct my_error_mgr jerr;
-    unsigned char *data = NULL;
-    unsigned char *line = NULL;
+    unsigned char *data;
+    unsigned char *line;
+    pipi_pixels_t *pixels;
+    JSAMPROW *jbuf;
+    uint32_t *ptr;
+    FILE *fp;
+    int i, j, y = 0;
     size_t len;
 
+    int quality = 75; /* FIXME */
+
     len = strlen(name);
     if(len < 4 || name[len - 4] != '.'
         || toupper(name[len - 3]) != 'J'
@@ -166,27 +175,26 @@ int pipi_save_jpeg(pipi_image_t *img, const char *name)
             return -1;
     }
 
-    pipi_pixels_t *pixels = pipi_get_pixels(img, PIPI_PIXELS_RGBA_U8);
-
-    if (!pixels)
-        return 0;
+    pixels = pipi_get_pixels(img, PIPI_PIXELS_RGBA_U8);
+    if(!pixels)
+        return -1;
 
     data = pixels->pixels;
 
     line = malloc(img->w * 3 * sizeof(unsigned char));
-    if (!line)
-        return 0;
+    if(!line)
+        return -1;
 
-    FILE *fp = fopen(name, "wb");
-    if (!fp) {
+    fp = fopen(name, "wb");
+    if(!fp)
+    {
         free(line);
-        return 0;
+        return -1;
     }
-    
-    if (setjmp(jerr.setjmp_buffer)) {
+
+    if(setjmp(jerr.setjmp_buffer))
         goto end;
-    }
-    
+
     jerr.pub.error_exit = error_msg;
     jerr.pub.emit_message = emit_msg;
     jerr.pub.output_message = output_msg;
@@ -204,11 +212,9 @@ int pipi_save_jpeg(pipi_image_t *img, const char *name)
     jpeg_set_quality(&cinfo, quality, TRUE);
     jpeg_start_compress(&cinfo, TRUE);
 
-    int j, i, y = 0;
-    uint32_t *ptr = (uint32_t*)data;
-    JSAMPROW           *jbuf;
+    ptr = (uint32_t*)data;
 
-    while (cinfo.next_scanline < cinfo.image_height)
+    while(cinfo.next_scanline < cinfo.image_height)
     {
         for (j = 0, i = 0; i < img->w; i++)
         {
@@ -223,6 +229,7 @@ int pipi_save_jpeg(pipi_image_t *img, const char *name)
     }
 
     jpeg_finish_compress(&cinfo);
+
 end:
     jpeg_destroy_compress(&cinfo);
     free(line);
@@ -230,7 +237,7 @@ end:
 
     pipi_release_pixels(img, pixels);
 
-    return 1;
+    return 0;
 }
 
 static int pipi_free_jpeg(pipi_image_t *img)
@@ -240,6 +247,3 @@ static int pipi_free_jpeg(pipi_image_t *img)
     return 0;
 }
 
-
-
-