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Fix Fl_Xlib_Graphics_Driver for RGB image drawing under XQuartz.

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ManoloFLTK 2022-08-09 16:05:53 +02:00
parent 64548e2f3a
commit 1562396ec0
1 changed files with 8 additions and 0 deletions
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8
src/drivers/Xlib/Fl_Xlib_Graphics_Driver_image.cxx
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@ -799,6 +799,14 @@ void Fl_Xlib_Graphics_Driver::draw_rgb(Fl_RGB_Image *rgb, int XP, int YP, int WP
*/
int Fl_Xlib_Graphics_Driver::scale_and_render_pixmap(Fl_Offscreen pixmap, int depth, double scale_x, double scale_y, int XP, int YP, int WP, int HP) {
bool has_alpha = (depth == 2 || depth == 4);
if (!has_alpha && scale_x == 1 && scale_y == 1) {
// Fix for a problem visible under XQuartz with test/device and Fl_Image_Surface:
// the drawn image is fully black. The problem does not occur under linux.
// Why the problem occurs under XQuartz remains unknown.
// The fix is to use XCopyArea() when adequate, rather than using Xrender.
XCopyArea(fl_display, pixmap, fl_window, gc_, 0, 0, WP, HP, XP, YP);
return 1;
}
XRenderPictureAttributes srcattr;
memset(&srcattr, 0, sizeof(XRenderPictureAttributes));
static XRenderPictFormat *fmt24 = XRenderFindStandardFormat(fl_display, PictStandardRGB24);