backport the changes to render/ from the alttab branch (commit 3592046b2b26e05ee94c0dd0fed5b7fd5475c198) in master, as the iconcache changes depend on this

git show 3592046b -- render

2 files changed, 19 insertions, 4 deletions

diff --git a/render/render.c b/render/render.c
index 2813dda0..b81e80a6 100644
--- a/render/render.c
+++ b/render/render.c
@@ -132,10 +132,20 @@ Pixmap RrPaintPixmap(RrAppearance *a, gint w, gint h)
             break;
         case RR_TEXTURE_RGBA:
             g_assert(!transferred);
-            RrImageDraw(a->surface.pixel_data,
-                        &a->texture[i].data.rgba,
-                        a->w, a->h,
-                        &tarea);
+            {
+                RrRect narea = tarea;
+                RrTextureRGBA *rgb = &a->texture[i].data.rgba;
+                if (rgb->twidth)
+                    narea.width = MIN(tarea.width, rgb->twidth);
+                if (rgb->theight)
+                    narea.height = MIN(tarea.height, rgb->theight);
+                narea.x += rgb->tx;
+                narea.y += rgb->ty;
+                RrImageDraw(a->surface.pixel_data,
+                            &a->texture[i].data.rgba,
+                            a->w, a->h,
+                            &narea);
+            }
             force_transfer = 1;
         break;
         }
diff --git a/render/render.h b/render/render.h
index d9438edc..10eafc6e 100644
--- a/render/render.h
+++ b/render/render.h
@@ -167,6 +167,11 @@ struct _RrTextureRGBA {
     gint cwidth;
     gint cheight;
     RrPixel32 *cache;
+/* size and position to draw at */
+    gint tx;
+    gint ty;
+    gint twidth;
+    gint theight;
 };
 
 struct _RrTextureLineArt {