From 94f0278d4771c816f3303efd2e8fa10fc6c41b7a Mon Sep 17 00:00:00 2001
From: Matthias Melcher <fltk@matthiasm.com>
Date: Tue, 9 Feb 2016 21:54:38 +0000
Subject: Porting efforts, minimal Android stuff, cleanup.

- Moving code around for Fl_Double_Window, but not yet happy
- Tested CMake for Android cross compilation. Very happy!

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3-porting@11142 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
---
 src/drivers/Xlib/Fl_Xlib_Graphics_Driver.cxx | 41 ++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

(limited to 'src/drivers/Xlib/Fl_Xlib_Graphics_Driver.cxx')

diff --git a/src/drivers/Xlib/Fl_Xlib_Graphics_Driver.cxx b/src/drivers/Xlib/Fl_Xlib_Graphics_Driver.cxx
index 0385413f1..cdcfd4548 100644
--- a/src/drivers/Xlib/Fl_Xlib_Graphics_Driver.cxx
+++ b/src/drivers/Xlib/Fl_Xlib_Graphics_Driver.cxx
@@ -21,6 +21,10 @@
 #include "../../config_lib.h"
 #include "Fl_Xlib_Graphics_Driver.h"
 
+#if HAVE_XRENDER
+#include <X11/extensions/Xrender.h>
+#endif
+
 
 const char *Fl_Xlib_Graphics_Driver::class_id = "Fl_Xlib_Graphics_Driver";
 
@@ -34,6 +38,43 @@ Fl_Graphics_Driver *Fl_Graphics_Driver::newMainGraphicsDriver()
   return new Fl_Xlib_Graphics_Driver();
 }
 
+char Fl_Xlib_Graphics_Driver::can_do_alpha_blending() {
+  return Fl_X::xrender_supported();
+}
+
+
+void Fl_Xlib_Graphics_Driver::copy_offscreen(int x, int y, int w, int h, Fl_Offscreen pixmap, int srcx, int srcy) {
+  XCopyArea(fl_display, pixmap, fl_window, fl_gc, srcx, srcy, w, h, x, y);
+}
+
+void Fl_Xlib_Graphics_Driver::copy_offscreen_with_alpha(int x, int y, int w, int h,
+                                                        Fl_Offscreen pixmap, int srcx, int srcy) {
+#if HAVE_XRENDER
+  XRenderPictureAttributes srcattr;
+  memset(&srcattr, 0, sizeof(XRenderPictureAttributes));
+  static XRenderPictFormat *srcfmt = XRenderFindStandardFormat(fl_display, PictStandardARGB32);
+  static XRenderPictFormat *dstfmt = XRenderFindStandardFormat(fl_display, PictStandardRGB24);
+
+  Picture src = XRenderCreatePicture(fl_display, pixmap, srcfmt, 0, &srcattr);
+  Picture dst = XRenderCreatePicture(fl_display, fl_window, dstfmt, 0, &srcattr);
+
+  if (!src || !dst) {
+    fprintf(stderr, "Failed to create Render pictures (%lu %lu)\n", src, dst);
+    return;
+  }
+
+  const Fl_Region clipr = fl_clip_region();
+  if (clipr)
+    XRenderSetPictureClipRegion(fl_display, dst, clipr);
+
+  XRenderComposite(fl_display, PictOpOver, src, None, dst, srcx, srcy, 0, 0,
+                   x, y, w, h);
+
+  XRenderFreePicture(fl_display, src);
+  XRenderFreePicture(fl_display, dst);
+#endif
+}
+
 //
 // End of "$Id$".
 //
-- 
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