-static void color_snapshot(Image::Image &image) {
- GLint drawbuffer = double_buffer ? GL_BACK : GL_FRONT;
- GLint readbuffer = double_buffer ? GL_BACK : GL_FRONT;
- glGetIntegerv(GL_DRAW_BUFFER, &drawbuffer);
- glGetIntegerv(GL_READ_BUFFER, &readbuffer);
- glReadBuffer(drawbuffer);
-
- glPushClientAttrib(GL_CLIENT_PIXEL_STORE_BIT);
- glPixelStorei(GL_PACK_SWAP_BYTES, GL_FALSE);
- glPixelStorei(GL_PACK_LSB_FIRST, GL_FALSE);
- glPixelStorei(GL_PACK_ROW_LENGTH, 0);
- glPixelStorei(GL_PACK_IMAGE_HEIGHT, 0);
- glPixelStorei(GL_PACK_SKIP_ROWS, 0);
- glPixelStorei(GL_PACK_SKIP_PIXELS, 0);
- glPixelStorei(GL_PACK_SKIP_IMAGES, 0);
- glPixelStorei(GL_PACK_ALIGNMENT, 1);
-
- glReadPixels(0, 0, image.width, image.height, GL_RGBA, GL_UNSIGNED_BYTE, image.pixels);
-
- glPopClientAttrib();
-
- glReadBuffer(readbuffer);
+ // Ignore zero area viewports
+ if (width == 0 || height == 0) {
+ return;
+ }
+
+ // Check for bound framebuffer last, as this may have a performance impact.
+ GLint draw_framebuffer = 0;
+ glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, &draw_framebuffer);
+ if (draw_framebuffer != 0) {
+ return;
+ }
+
+ drawable->resize(width, height);
+ drawable->show();
+
+ glScissor(0, 0, width, height);