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Simpler Fl_X::q_begin_image() function without matrix inversion that accepts scaling and rotation.

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git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@7130 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
This commit is contained in:
Manolo Gouy 2010-02-21 18:40:15 +00:00
parent 0650daaaac
commit cdfefaed88
1 changed files with 15 additions and 0 deletions
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15
src/Fl_cocoa.mm
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@ -2464,6 +2464,7 @@ void Fl_X::q_release_context(Fl_X *x) {
#endif
}
/* the former implementation
void Fl_X::q_begin_image(CGRect &rect, int cx, int cy, int w, int h) {
CGContextSaveGState(fl_gc);
CGAffineTransform mx = CGContextGetCTM(fl_gc);
@ -2478,6 +2479,20 @@ void Fl_X::q_begin_image(CGRect &rect, int cx, int cy, int w, int h) {
rect.size.width = w;
rect.size.height = h;
}
*/
void Fl_X::q_begin_image(CGRect &rect, int cx, int cy, int w, int h) {
CGContextSaveGState(fl_gc);
CGRect r2 = rect;
r2.origin.x -= 0.5f;
r2.origin.y -= 0.5f;
CGContextClipToRect(fl_gc, r2);
// move graphics context to origin of vertically reversed image
CGContextTranslateCTM(fl_gc, rect.origin.x - cx - 0.5, rect.origin.y - cy + h - 0.5);
CGContextScaleCTM(fl_gc, 1, -1);
rect.origin.x = rect.origin.y = 0;
rect.size.width = w;
rect.size.height = h;
}
void Fl_X::q_end_image() {
CGContextRestoreGState(fl_gc);