*fix* image rendering in real_transparency mode fixed (imlib_render_image does not...

[chaz/tint2] / src / util / common.c

diff --git a/src/util/common.c b/src/util/common.c
index c186d424fc66f42e52bceef06935f430069145d8..9f122d6a3ca9b54b816851dc028b9a7e4888678d 100644 (file)
--- a/src/util/common.c
+++ b/src/util/common.c
@@ -21,12 +21,14 @@
 #include <X11/Xlib.h>
 #include <X11/Xutil.h>
 #include <X11/Xatom.h>
+#include <X11/extensions/Xrender.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
 
 #include "common.h"
+#include "server.h"
 
 
 
@@ -249,3 +251,23 @@ void createHeuristicMask(DATA32* data, int w, int h)
                udata += 4;
        }
 }
+
+
+void render_image(Drawable d, int x, int y, int w, int h)
+{
+       // in real_transparency mode imlib_render_image_on_drawable does not the right thing, because
+       // the operation is IMLIB_OP_COPY, but we would need IMLIB_OP_OVER (which does not exist)
+       // Therefore we have to do it with the XRender extension (i.e. copy what imlib is doing internally)
+       // But first we need to render the image onto itself with PictOpIn to adjust the colors to the alpha channel
+       Pixmap pmap_tmp = XCreatePixmap(server.dsp, server.root_win, w, h, 32);
+       imlib_context_set_drawable(pmap_tmp);
+       imlib_context_set_blend(0);
+       imlib_render_image_on_drawable(0, 0);
+       Picture pict_image = XRenderCreatePicture(server.dsp, pmap_tmp, XRenderFindStandardFormat(server.dsp, PictStandardARGB32), 0, 0);
+       Picture pict_drawable = XRenderCreatePicture(server.dsp, d, XRenderFindVisualFormat(server.dsp, server.visual), 0, 0);
+       XRenderComposite(server.dsp, PictOpIn, pict_image, None, pict_image, 0, 0, 0, 0, 0, 0, w, h);
+       XRenderComposite(server.dsp, PictOpOver, pict_image, None, pict_drawable, 0, 0, 0, 0, x, y, w, h);
+       XFreePixmap(server.dsp, pmap_tmp);
+       XRenderFreePicture(server.dsp, pict_image);
+       XRenderFreePicture(server.dsp, pict_drawable);
+}