1 files changed, 95 insertions, 0 deletions
diff --git a/gdk-pixbuf/gdk-pixbuf-xform.c b/gdk-pixbuf/gdk-pixbuf-xform.c
new file mode 100644
index 000000000..1e2eabe19
--- /dev/null
+++ b/gdk-pixbuf/gdk-pixbuf-xform.c
@@ -0,0 +1,95 @@
+GdkPixbuf *
+gdk_pixbuf_scale (const GdkPixbuf *pixbuf, gint w, gint h)
+{
+	art_u8 *pixels;
+	gint rowstride;
+	double affine[6];
+	ArtAlphaGamma *alphagamma;
+	ArtPixBuf *art_pixbuf = NULL;
+	GdkPixbuf *copy = NULL;
+
+	alphagamma = NULL;
+
+	affine[1] = affine[2] = affine[4] = affine[5] = 0;
+
+	affine[0] = w / (double)(pixbuf->art_pixbuf->width);
+	affine[3] = h / (double)(pixbuf->art_pixbuf->height);
+
+	/* rowstride = w * pixbuf->art_pixbuf->n_channels; */
+	rowstride = w * 3;
+
+	pixels = art_alloc (h * rowstride);
+	art_rgb_pixbuf_affine (pixels, 0, 0, w, h, rowstride,
+			       pixbuf->art_pixbuf,
+			       affine, ART_FILTER_NEAREST, alphagamma);
+
+	if (pixbuf->art_pixbuf->has_alpha)
+		/* should be rgba */
+		art_pixbuf = art_pixbuf_new_rgb(pixels, w, h, rowstride);
+	else
+		art_pixbuf = art_pixbuf_new_rgb(pixels, w, h, rowstride);
+
+	copy = gdk_pixbuf_new (art_pixbuf, NULL);
+
+	if (!copy)
+		art_free (pixels);
+
+	return copy;
+}
+
+GdkPixbuf *
+gdk_pixbuf_rotate (GdkPixbuf *pixbuf, gdouble angle)
+{
+	art_u8 *pixels;
+	gint rowstride, w, h;
+	gdouble rad;
+	double rot[6], trans[6], affine[6];
+	ArtAlphaGamma *alphagamma = NULL;
+	ArtPixBuf *art_pixbuf = NULL;
+
+	w = pixbuf->art_pixbuf->width;
+	h = pixbuf->art_pixbuf->height;
+
+	rad = (M_PI * angle / 180.0);
+
+	rot[0] = cos(rad);
+	rot[1] = sin(rad);
+	rot[2] = -sin(rad);
+	rot[3] = cos(rad);
+	rot[4] = rot[5] = 0;
+
+	trans[0] = trans[3] = 1;
+	trans[1] = trans[2] = 0;
+	trans[4] = -(double)w / 2.0;
+	trans[5] = -(double)h / 2.0;
+
+	art_affine_multiply(rot, trans, rot);
+
+	trans[0] = trans[3] = 1;
+	trans[1] = trans[2] = 0;
+	trans[4] = (double)w / 2.0;
+	trans[5] = (double)h / 2.0;
+
+	art_affine_multiply(affine, rot, trans);
+
+	g_print("Affine: %e %e %e %e %e %e\n", affine[0], affine[1], affine[2],
+		affine[3], affine[4], affine[5]);
+
+	/* rowstride = w * pixbuf->art_pixbuf->n_channels; */
+	rowstride = w * 3;
+
+	pixels = art_alloc (h * rowstride);
+	art_rgb_pixbuf_affine (pixels, 0, 0, w, h, rowstride,
+			       pixbuf->art_pixbuf,
+			       affine, ART_FILTER_NEAREST, alphagamma);
+	if (pixbuf->art_pixbuf->has_alpha)
+		/* should be rgba */
+		art_pixbuf = art_pixbuf_new_rgb(pixels, w, h, rowstride);
+	else
+		art_pixbuf = art_pixbuf_new_rgb(pixels, w, h, rowstride);
+
+	art_pixbuf_free (pixbuf->art_pixbuf);
+	pixbuf->art_pixbuf = art_pixbuf;
+
+	return pixbuf;
+}