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Check boundary conditions in Cocoa scroll code (#554)

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This commit is contained in:
Matthias Melcher
2022-11-24 12:44:08 +01:00
committed by GitHub
parent 8978bd1a84
commit 12dccaf711
1 changed files with 11 additions and 7 deletions
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src/drivers/Cocoa/Fl_Cocoa_Window_Driver.cxx
+11 -7
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@@ -233,14 +233,18 @@ void Fl_Cocoa_Window_Driver::hide() {
int Fl_Cocoa_Window_Driver::scroll(int src_x, int src_y, int src_w, int src_h, int dest_x, int dest_y, void (*draw_area)(void*, int,int,int,int), void* data)
{
if ( (src_x < 0) || (src_y < 0) )
return 1;
if ( (src_x+src_w > pWindow->w()) || (src_y+src_h > pWindow->h()) )
return 1;
CGImageRef img = CGImage_from_window_rect(src_x, src_y, src_w, src_h);
if (img) {
// the current surface is generally the display, but is an Fl_Image_Surface when scrolling an Fl_Overlay_Window
Fl_Quartz_Graphics_Driver *qgd = (Fl_Quartz_Graphics_Driver*)Fl_Surface_Device::surface()->driver();
float s = qgd->scale();
qgd->draw_CGImage(img, dest_x, dest_y, lround(s*src_w), lround(s*src_h), 0, 0, src_w, src_h);
CFRelease(img);
}
if (!img)
return 1;
// the current surface is generally the display, but is an Fl_Image_Surface when scrolling an Fl_Overlay_Window
Fl_Quartz_Graphics_Driver *qgd = (Fl_Quartz_Graphics_Driver*)Fl_Surface_Device::surface()->driver();
float s = qgd->scale();
qgd->draw_CGImage(img, dest_x, dest_y, lround(s*src_w), lround(s*src_h), 0, 0, src_w, src_h);
CFRelease(img);
return 0;
}