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Move Fl_Quartz_Graphics_Driver::draw_CGImage() to Fl_Quartz_Graphics_Driver_image.cxx

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git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3-porting@11169 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
This commit is contained in:
Manolo Gouy 2016-02-14 06:02:12 +00:00
parent 8630bdbed2
commit a349dc994e
2 changed files with 37 additions and 37 deletions
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37
src/drivers/Quartz/Fl_Quartz_Graphics_Driver.cxx
View File

@ -150,43 +150,6 @@ void fl_end_offscreen() {
/** @} */
void Fl_Quartz_Graphics_Driver::draw_CGImage(CGImageRef cgimg, int x, int y, int w, int h, int srcx, int srcy, int sw, int sh)
{
CGRect rect = CGRectMake(x, y, w, h);
CGContextSaveGState(fl_gc);
CGContextClipToRect(fl_gc, CGRectOffset(rect, -0.5, -0.5 ));
// move graphics context to origin of vertically reversed image
// The 0.5 here cancels the 0.5 offset present in Quartz graphics contexts.
// Thus, image and surface pixels are in phase if there's no scaling.
CGContextTranslateCTM(fl_gc, rect.origin.x - srcx - 0.5, rect.origin.y - srcy + sh - 0.5);
CGContextScaleCTM(fl_gc, 1, -1);
CGAffineTransform at = CGContextGetCTM(fl_gc);
if (at.a == at.d && at.b == 0 && at.c == 0) { // proportional scaling, no rotation
// We handle x2 and /2 scalings that occur when drawing to
// a double-resolution bitmap, and when drawing a double-resolution bitmap to display.
bool doit = false;
// phase image with display pixels
CGFloat deltax = 0, deltay = 0;
if (at.a == 2) { // make .tx and .ty have even values
deltax = (at.tx/2 - round(at.tx/2));
deltay = (at.ty/2 - round(at.ty/2));
doit = true;
} else if (at.a == 0.5) {
doit = true;
if (Fl_Display_Device::high_resolution()) { // make .tx and .ty have int or half-int values
deltax = (at.tx*2 - round(at.tx*2));
deltay = (at.ty*2 - round(at.ty*2));
} else { // make .tx and .ty have integral values
deltax = (at.tx - round(at.tx))*2;
deltay = (at.ty - round(at.ty))*2;
}
}
if (doit) CGContextTranslateCTM(fl_gc, -deltax, -deltay);
}
CGContextDrawImage(fl_gc, CGRectMake(0, 0, sw, sh), cgimg);
CGContextRestoreGState(fl_gc);
}
//
// End of "$Id$".
//

37
src/drivers/Quartz/Fl_Quartz_Graphics_Driver_image.cxx
View File

@ -314,6 +314,43 @@ fl_uintptr_t Fl_Quartz_Graphics_Driver::cache(Fl_Pixmap *img, int w, int h, cons
return (fl_uintptr_t)id;
}
void Fl_Quartz_Graphics_Driver::draw_CGImage(CGImageRef cgimg, int x, int y, int w, int h, int srcx, int srcy, int sw, int sh)
{
CGRect rect = CGRectMake(x, y, w, h);
CGContextSaveGState(fl_gc);
CGContextClipToRect(fl_gc, CGRectOffset(rect, -0.5, -0.5 ));
// move graphics context to origin of vertically reversed image
// The 0.5 here cancels the 0.5 offset present in Quartz graphics contexts.
// Thus, image and surface pixels are in phase if there's no scaling.
CGContextTranslateCTM(fl_gc, rect.origin.x - srcx - 0.5, rect.origin.y - srcy + sh - 0.5);
CGContextScaleCTM(fl_gc, 1, -1);
CGAffineTransform at = CGContextGetCTM(fl_gc);
if (at.a == at.d && at.b == 0 && at.c == 0) { // proportional scaling, no rotation
// We handle x2 and /2 scalings that occur when drawing to
// a double-resolution bitmap, and when drawing a double-resolution bitmap to display.
bool doit = false;
// phase image with display pixels
CGFloat deltax = 0, deltay = 0;
if (at.a == 2) { // make .tx and .ty have even values
deltax = (at.tx/2 - round(at.tx/2));
deltay = (at.ty/2 - round(at.ty/2));
doit = true;
} else if (at.a == 0.5) {
doit = true;
if (Fl_Display_Device::high_resolution()) { // make .tx and .ty have int or half-int values
deltax = (at.tx*2 - round(at.tx*2));
deltay = (at.ty*2 - round(at.ty*2));
} else { // make .tx and .ty have integral values
deltax = (at.tx - round(at.tx))*2;
deltay = (at.ty - round(at.ty))*2;
}
}
if (doit) CGContextTranslateCTM(fl_gc, -deltax, -deltay);
}
CGContextDrawImage(fl_gc, CGRectMake(0, 0, sw, sh), cgimg);
CGContextRestoreGState(fl_gc);
}
//
// End of "$Id$".
//