Work on jpeg loading

src/Image.cc

@@ -203,7 +203,6 @@ EIO_AfterLoad(eio_req *req) {
 
 void
 Image::load() {
-  printf("%d\n", extension(filename));
   if (LOADING != state) {
     // TODO: use node IO
     // Ref();
@@ -271,10 +270,60 @@ Image::error(Local<Value> err) {
 
 cairo_status_t
 Image::loadSurface() {
+  switch (extension(filename)) {
+    case Image::PNG:
       _surface = cairo_image_surface_create_from_png(filename);
       width = cairo_image_surface_get_width(_surface);
       height = cairo_image_surface_get_height(_surface);
       return cairo_surface_status(_surface);
+      break;
+    case Image::JPEG: {
+      // TODO: error handling
+      // TODO: move to node IO
+      FILE *stream = fopen(filename, "r");
+      struct jpeg_decompress_struct info;
+      struct jpeg_error_mgr err;
+      info.err = jpeg_std_error(&err);
+      jpeg_create_decompress(&info);
+      jpeg_stdio_src(&info, stream);
+      jpeg_read_header(&info, 1);
+      jpeg_start_decompress(&info);
+      width = info.output_width;
+      height = info.output_height;
+
+      uint8_t *data = (uint8_t *) malloc(width * height * 4);
+      uint8_t *src = (uint8_t *) malloc(width * 3);
+
+      for (int y = 0; y < height; ++y) {
+        jpeg_read_scanlines(&info, &src, 1);
+        uint32_t *row = (uint32_t *)(data + (width * 4));
+        for (int x = 0; x < width; ++x) {
+          uint32_t *pixel = row + x;
+          uint8_t r = src[x];
+          uint8_t g = src[x + 1];
+          uint8_t b = src[x + 2];
+          *pixel = 255 << 24
+            | r << 16
+            | g << 8
+            | b;
+        }
+      }
+      
+      _surface = cairo_image_surface_create_for_data(
+          data
+        , CAIRO_FORMAT_ARGB32
+        , width
+        , height
+        , width * 4);
+
+      fclose(stream);
+      jpeg_finish_decompress(&info);
+      jpeg_destroy_decompress(&info);
+      return cairo_surface_status(_surface);
+      }
+      break;
+  }
+  return CAIRO_STATUS_READ_ERROR;
 }
 
 /*

wscript

@@ -11,6 +11,7 @@ def configure(conf):
   conf.check_tool('compiler_cxx')
   conf.check_tool('node_addon')
   conf.env.append_value('CPPFLAGS', '-DNDEBUG')
+  conf.check(lib='jpeg', uselib_store='JPEG')
   conf.check_cfg(package='cairo', mandatory=1, args='--cflags --libs')
   flags = ['-O3', '-Wall']
   conf.env.append_value('CCFLAGS', flags)
@@ -20,4 +21,4 @@ def build(bld):
   obj = bld.new_task_gen('cxx', 'shlib', 'node_addon')
   obj.target = 'canvas'
   obj.source = bld.glob('src/*.cc')
-  obj.uselib = ['CAIRO']
+  obj.uselib = ['CAIRO', 'JPEG']