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Flip clip mask image when setting clip mask on GC

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(cherry picked from commit 9f5f47f8be)
This commit is contained in:
Kristian Rietveld 2010-06-26 17:12:35 +02:00
parent 88cae1769b
commit 019ccc686d
1 changed files with 64 additions and 1 deletions
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65
gdk/quartz/gdkgc-quartz.c
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@ -60,6 +60,69 @@ gdk_quartz_gc_get_values (GdkGC *gc,
values->join_style = private->join_style;
}
static void
data_provider_release (void *info, const void *data, size_t size)
{
g_free (info);
}
static CGImageRef
create_clip_mask (GdkPixmap *source_pixmap)
{
int width, height, bytes_per_row, bits_per_pixel;
void *data;
CGImageRef source;
CGImageRef clip_mask;
CGContextRef cg_context;
CGDataProviderRef data_provider;
/* We need to flip the clip mask here, because this cannot be done during
* the drawing process when this mask will be used to do clipping. We
* quickly create a new CGImage, set up a CGContext, draw the source
* image while flipping, and done. If this appears too slow in the
* future, we would look into doing this by hand on the actual raw
* data.
*/
source = GDK_PIXMAP_IMPL_QUARTZ (GDK_PIXMAP_OBJECT (source_pixmap)->impl)->image;
width = CGImageGetWidth (source);
height = CGImageGetHeight (source);
bytes_per_row = CGImageGetBytesPerRow (source);
bits_per_pixel = CGImageGetBitsPerPixel (source);
data = g_malloc (height * bytes_per_row);
data_provider = CGDataProviderCreateWithData (data, data,
height * bytes_per_row,
data_provider_release);
clip_mask = CGImageCreate (width, height, 8,
bits_per_pixel,
bytes_per_row,
CGImageGetColorSpace (source),
CGImageGetAlphaInfo (source),
data_provider, NULL, FALSE,
kCGRenderingIntentDefault);
CGDataProviderRelease (data_provider);
cg_context = CGBitmapContextCreate (data,
width, height,
CGImageGetBitsPerComponent (source),
bytes_per_row,
CGImageGetColorSpace (source),
CGImageGetBitmapInfo (source));
CGContextTranslateCTM (cg_context, 0, height);
CGContextScaleCTM (cg_context, 1.0, -1.0);
CGContextDrawImage (cg_context,
CGRectMake (0, 0, width, height), source);
CGContextRelease (cg_context);
return clip_mask;
}
static void
gdk_quartz_gc_set_values (GdkGC *gc,
GdkGCValues *values,
@ -89,7 +152,7 @@ gdk_quartz_gc_set_values (GdkGC *gc,
CGImageRelease (private->clip_mask);
if (values->clip_mask)
private->clip_mask = CGImageCreateCopy (GDK_PIXMAP_IMPL_QUARTZ (GDK_PIXMAP_OBJECT (values->clip_mask)->impl)->image);
private->clip_mask = create_clip_mask (values->clip_mask);
else
private->clip_mask = NULL;
}