218                                      const gl::Rectangle *scissor,  in blitImpl()  argument
274         if (scissor)  in blitImpl()
276             if (dstRect.left < scissor->x)  in blitImpl()
278                 srcRect.left += (scissor->x - dstRect.left);  in blitImpl()
279                 dstRect.left = scissor->x;  in blitImpl()
281             if (dstRect.top < scissor->y)  in blitImpl()
283                 srcRect.top += (scissor->y - dstRect.top);  in blitImpl()
284                 dstRect.top = scissor->y;  in blitImpl()
286             if (dstRect.right > scissor->x + scissor->width)  in blitImpl()
288                 srcRect.right -= (dstRect.right - (scissor->x + scissor->width));  in blitImpl()
289                 dstRect.right = scissor->x + scissor->width;  in blitImpl()
291             if (dstRect.bottom > scissor->y + scissor->height)  in blitImpl()
293                 srcRect.bottom -= (dstRect.bottom - (scissor->y + scissor->height));  in blitImpl()
294                 dstRect.bottom = scissor->y + scissor->height;  in blitImpl()