* applied patch provided by Christophe Fergeau <teuf at gnome.org>

	  for artwork database support (read-only).


git-svn-id: https://gtkpod.svn.sf.net/svnroot/gtkpod/libgpod/trunk@1093 f01d2545-417e-4e96-918e-98f8d0dbbcb6

1 files changed, 220 insertions, 0 deletions

diff --git a/src/db-image-parser.c b/src/db-image-parser.c
new file mode 100644
index 0000000..a87485f
--- /dev/null
+++ b/src/db-image-parser.c
@@ -0,0 +1,220 @@
+/*
+ *  Copyright (C) 2005 Christophe Fergeau
+ *
+ * 
+ *  The code contained in this file is free software; you can redistribute
+ *  it and/or modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either version
+ *  2.1 of the License, or (at your option) any later version.
+ *  
+ *  This file 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
+ *  Lesser General Public License for more details.
+ *  
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this code; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ * 
+ *  iTunes and iPod are trademarks of Apple
+ * 
+ *  This product is not supported/written/published by Apple!
+ *
+ */
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/types.h>
+
+#include <glib.h>
+#include <glib-object.h>
+
+#include "db-image-parser.h"
+
+#define RED_BITS   5
+#define RED_SHIFT 11
+#define RED_MASK  (((1 << RED_BITS)-1) << RED_SHIFT)
+
+#define GREEN_BITS 6
+#define GREEN_SHIFT 5
+#define GREEN_MASK (((1 << GREEN_BITS)-1) << GREEN_SHIFT)
+
+#define BLUE_BITS 5
+#define BLUE_SHIFT 0
+#define BLUE_MASK (((1 << BLUE_BITS)-1) << BLUE_SHIFT)
+
+
+static unsigned char *
+unpack_RGB_565 (gushort *pixels, unsigned int bytes_len)
+{
+	unsigned char *result;
+	unsigned int i;
+
+	result = g_malloc ((bytes_len/2) * 3);
+	if (result == NULL) {
+		return NULL;
+	}
+	for (i = 0; i < bytes_len/2; i++) {
+		gushort cur_pixel;
+
+		cur_pixel = GINT16_FROM_LE (pixels[i]);
+		/* Unpack pixels */
+		result[3*i] = (pixels[i] & RED_MASK) >> RED_SHIFT;
+		result[3*i+1] = (pixels[i] & GREEN_MASK) >> GREEN_SHIFT;
+		result[3*i+2] = (pixels[i] & BLUE_MASK) >> BLUE_SHIFT;
+		
+		/* Normalize color values so that they use a [0..255] range */
+		result[3*i] <<= (8 - RED_BITS);
+		result[3*i+1] <<= (8 - GREEN_BITS);
+		result[3*i+2] <<= (8 - BLUE_BITS);
+	}
+
+	return result;
+}
+
+#if 0
+G_GNUC_UNUSED static void
+pack_RGB_565 (GdkPixbuf *pixbuf, gushort **pixels565, unsigned int *bytes_len)
+{
+	guchar *pixels;
+	gushort *result;
+	gint row_stride;
+	gint channels;
+	gint width;
+	gint height;
+	gint w;
+	gint h;
+
+	g_object_get (G_OBJECT (pixbuf), 
+		      "rowstride", &row_stride, "n-channels", &channels,
+		      "height", &height, "width", &width,
+		      "pixels", &pixels, NULL);
+
+	result = g_malloc0 (width * height * 2);
+
+	for (h = 0; h < height; h++) {
+		for (w = 0; w < width; w++) {
+			gint r;
+			gint g;
+			gint b;
+
+			r = pixels[(h*row_stride + w)*channels];
+			g = pixels[(h*row_stride + w)*channels + 1]; 
+			b = pixels[(h*row_stride + w)*channels + 2]; 
+			r >>= (8 - RED_BITS);
+			g >>= (8 - GREEN_BITS);
+			b >>= (8 - BLUE_BITS);
+			r = (r << RED_SHIFT) & RED_MASK;
+			g = (g << GREEN_SHIFT) & GREEN_MASK;
+			b = (b << BLUE_SHIFT) & BLUE_MASK;
+			result[h*height + w] =  (GINT16_TO_LE (r | g | b));
+		}
+	}
+
+	*pixels565 = result;
+	*bytes_len = width * height * 2;
+}
+#endif
+
+static unsigned char *
+get_pixel_data (Itdb_Image *image)
+{
+	unsigned char *result;
+	FILE *f;
+	int res;
+
+	f = NULL;
+	result = g_malloc (image->size);
+	if (result == NULL) {
+		return NULL;
+	}
+
+	f = fopen (image->filename, "r");
+	if (f == NULL) {
+		g_print ("Failed to open %s: %s\n", 
+			 image->filename, strerror (errno));
+		goto end;
+	}
+
+	res = fseek (f, image->offset, SEEK_SET);
+	if (res != 0) {
+		g_print ("Seek to %lu failed on %s: %s\n",
+			 image->offset, image->filename, strerror (errno));
+		goto end;
+	}
+
+	res = fread (result, image->size, 1, f);
+	if (res != 1) {
+		g_print ("Failed to read %u bytes from %s: %s\n", 
+			 image->size, image->filename, strerror (errno));
+		goto end;
+	}
+	fclose (f);
+
+	return result;
+
+ end:
+	if (f != NULL) {
+		fclose (f);
+	}
+	g_free (result);
+
+	return NULL;
+}
+
+unsigned char *
+itdb_image_get_rgb_data (Itdb_Image *image)
+{
+	void *pixels565;
+	void *pixels;
+
+	pixels565 = get_pixel_data (image);
+	if (pixels565 == NULL) {
+		return NULL;
+	}
+	
+	pixels = unpack_RGB_565 (pixels565, image->size);
+	g_free (pixels565);
+
+	return pixels;
+
+	/*	return  gdk_pixbuf_new_from_data (pixels, GDK_COLORSPACE_RGB, FALSE,
+					  8, image->width, image->height, 
+					  image->width * 3, 
+					  (GdkPixbufDestroyNotify)g_free, 
+					  NULL);
+	*/
+}
+
+G_GNUC_INTERNAL Itdb_Image *
+ipod_image_new_from_mhni (MhniHeader *mhni, const char *mount_point)
+{
+	Itdb_Image *img;
+
+	img = g_new0 (Itdb_Image, 1);
+	if (img == NULL) {
+		return NULL;
+	}
+	img->filename = g_strdup_printf ("%s/iPod_Control/Artwork/F%04u_1.ithmb", mount_point, GINT_FROM_LE (mhni->correlation_id));
+	img->size = GINT_FROM_LE (mhni->image_size);
+	img->offset = GINT_FROM_LE (mhni->ithmb_offset);
+	img->width = (GINT_FROM_LE (mhni->image_dimensions) & 0xffff0000) >> 16;
+	img->height = (GINT_FROM_LE (mhni->image_dimensions) & 0x0000ffff);
+
+	return img;
+}
+
+G_GNUC_INTERNAL Itdb_Image *
+ipod_image_new_from_mhii (MhiiHeader *mhii)
+{
+	Itdb_Image *img;
+
+	img = g_new0 (Itdb_Image, 1);
+	if (img == NULL) {
+		return NULL;
+	}
+	img->size = GINT_FROM_LE (mhii->orig_img_size);
+	img->id = GINT_FROM_LE (mhii->image_id);
+
+	return img;	
+}