Author: manolo
Date: 2012-11-15 04:28:29 -0800 (Thu, 15 Nov 2012)
New Revision: 9723
Log:
Mac OS: make clear that image capture from screen returns an image in
premultiplied RGBA format.
Modified:
branches/branch-1.3/src/Fl_cocoa.mm
Modified: branches/branch-1.3/src/Fl_cocoa.mm
===================================================================
--- branches/branch-1.3/src/Fl_cocoa.mm 2012-11-15 08:43:44 UTC (rev 9722)
+++ branches/branch-1.3/src/Fl_cocoa.mm 2012-11-15 12:28:29 UTC (rev 9723)
@@ -3335,7 +3335,12 @@
}
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 @@
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 @@
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
}
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