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Mac OS: make clear that image capture from screen returns an image in premultiplied RGBA format.

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git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@9723 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
This commit is contained in:
Manolo Gouy 2012-11-15 12:28:29 +00:00
parent 302200668b
commit 9adccd6df6
1 changed files with 14 additions and 9 deletions
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23
src/Fl_cocoa.mm
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@ -3335,7 +3335,12 @@ static NSBitmapImageRep* rect_to_NSBitmapImageRep(Fl_Window *win, int x, int y,
}
unsigned char *Fl_X::bitmap_from_window_rect(Fl_Window *win, int x, int y, int w, int h, int *bytesPerPixel)
// delete[] the returned pointer after use
/* Returns a capture of part of a mapped window as a pre-multiplied RGBA array of bytes.
At present, alpha values are always 1 (or 0 for the angles of a window title bar)
because only opaque colors are used to draw, so pre-multiplication can be ignored.
*bytesPerPixel is always set to the value 4 upon return.
delete[] the returned pointer after use
*/
{
NSBitmapImageRep *bitmap = rect_to_NSBitmapImageRep(win, x, y, w, h);
*bytesPerPixel = [bitmap bitsPerPixel]/8;
@ -3380,7 +3385,7 @@ CGImageRef Fl_X::CGImage_from_window_rect(Fl_Window *win, int x, int y, int w, i
CGColorSpaceRef lut = CGColorSpaceCreateDeviceRGB();
CGDataProviderRef provider = CGDataProviderCreateWithData(NULL, bitmap, w*h*bpp, imgProviderReleaseData);
img = CGImageCreate(w, h, 8, 8*bpp, w*bpp, lut,
bpp == 3 ? kCGImageAlphaNone : kCGImageAlphaLast,
bpp == 3 ? kCGImageAlphaNone : kCGImageAlphaPremultipliedLast,
provider, NULL, false, kCGRenderingIntentDefault);
CGColorSpaceRelease(lut);
CGDataProviderRelease(provider);
@ -3434,14 +3439,14 @@ void Fl_Paged_Device::print_window(Fl_Window *win, int x_offset, int y_offset)
Fl::check();
win->make_current();
this->set_current(); // back to the Fl_Paged_Device
int bpp;
// capture the window title bar as an RGBA image
unsigned char *top_image = Fl_X::bitmap_from_window_rect(win, 0, -bt, win->w(), bt, &bpp);
Fl_RGB_Image* rgba = new Fl_RGB_Image(top_image, win->w(), bt, bpp);
// capture the window title bar
CGImageRef img = Fl_X::CGImage_from_window_rect(win, 0, -bt, win->w(), bt);
// and print it
rgba->draw(x_offset, y_offset);
delete rgba;
delete[] top_image;
CGRect rect = { { x_offset, y_offset }, { win->w(), bt } };
Fl_X::q_begin_image(rect, 0, 0, win->w(), bt);
CGContextDrawImage(fl_gc, rect, img);
Fl_X::q_end_image();
CFRelease(img);
this->print_widget(win, x_offset, y_offset + bt); // print the window inner part
}