Loading framework done, start of PNG loader

1 files changed, 62 insertions, 0 deletions

diff --git a/gdk-pixbuf/io-png.c b/gdk-pixbuf/io-png.c
new file mode 100644
index 0000000000..18f661ce05
--- /dev/null
+++ b/gdk-pixbuf/io-png.c
@@ -0,0 +1,62 @@
+/*
+ * io-png.c: GdkPixBuf image loader for PNG files.
+ *
+ * Author:
+ *    Rasterman (raster@redhat.com).
+ *    Miguel de Icaza (miguel@gnu.org)
+ *
+ */
+#include <config.h>
+#include <stdio.h>
+#include "gdk-pixbuf.h"
+#include "gdk-pixbuf-io.h"
+#include <png.h>
+
+/* Shared library entry point */
+GdkPixBuf *
+image_load (FILE *f);
+{
+	png_structp png;
+	png_infop   info_ptr, end_info;
+	int width, height, depth, color_type, interlace_type;
+	
+	g_return_val_if_fail (filename != NULL, NULL);
+
+	png = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
+	if (png)
+		return NULL;
+
+	info_ptr = png_create_info_struct (png);
+	if (!info_ptr){
+		png_destroy_read_struct (&png, NULL, NULL);
+		return NULL;
+	}
+
+	end_info = png_create_info_struct (png);
+	if (!end_info){
+		png_destroy_read_struct (&png, &info_ptr, NULL);
+		return NULL:
+	}
+
+	if (setjmp (png->jmpbuf)){
+		png_destroy_read_struct (&png, &info_ptr, &end_info);
+		return NULL;
+	}
+
+	png_init_io (pngptr, f);
+
+	png_read_info (png, info_ptr);
+	png_get_IHDR (png, info_ptr, &width, &height, &depth, &color_type, &interlace_type, NULL, NULL);
+
+	if (color_type == color_type == PNG_COLOR_TYPE_PALETTE)
+		png_set_expand (png);
+	
+	png_set_strip_16 (png);
+	png_set_packing (png);
+	if (png_get_valid (png, info_ptr, PNG_INFO_tRNS))
+		png_set_expand (png);
+
+	png_set_filler (png, 0xff, PNG_FILLER_AFTER);
+
+	/* FIXME finish this */
+}