diff options
Diffstat (limited to 'src/Fl_Double_Window.cxx')
| -rw-r--r-- | src/Fl_Double_Window.cxx | 34 |
1 files changed, 32 insertions, 2 deletions
diff --git a/src/Fl_Double_Window.cxx b/src/Fl_Double_Window.cxx index 99ba3e7d1..f85af930b 100644 --- a/src/Fl_Double_Window.cxx +++ b/src/Fl_Double_Window.cxx @@ -129,14 +129,44 @@ void Fl_Graphics_Driver::copy_offscreen(int x, int y, int w, int h, Fl_Offscreen #if defined(USE_X11) +#ifdef HAVE_XRENDER +#include <X11/extensions/Xrender.h> +#endif + 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) { +#ifdef HAVE_XRENDER + XRenderPictureAttributes srcattr; + memset(&srcattr, 0, sizeof(XRenderPictureAttributes)); + XRenderPictFormat *srcfmt = XRenderFindStandardFormat(fl_display, PictStandardARGB32); + 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 +} -// maybe someone feels inclined to implement alpha blending on X11? char fl_can_do_alpha_blending() { - return 0; + return Fl_X::xrender_supported(); } #elif defined(WIN32) |