bool MCRegionTransform(MCRegionRef p_region, const MCGAffineTransform &p_transform, MCRegionRef &r_transformed_region)
{
bool t_success;
t_success = true;
MCRegionRef t_new_region;
t_new_region = nil;
t_success = MCRegionCreate(t_new_region);
if (t_success)
{
MCRegionTransformContext t_context;
t_context.region = t_new_region;
t_context.transform = p_transform;
t_success = MCRegionForEachRect(p_region, MCRegionTransformCallback, &t_context);
}
if (t_success)
r_transformed_region = t_new_region;
else
MCRegionDestroy(t_new_region);
return t_success;
}
bool MCWin32ApplyMaskToRasterRegion(MCGRaster &p_raster, uint32_t p_x_origin, uint32_t p_y_origin, const MCGRaster &p_mask, MCRegionRef p_region)
{
// IM-2013-09-11: [[ ResIndependence ]] reduce mask params to single MCGRaster
bool t_success;
t_success = true;
MCGContextRef t_gcontext;
t_gcontext = nil;
if (t_success)
t_success = MCGContextCreateWithRaster(p_raster, t_gcontext);
MCGImageRef t_mask_image;
t_mask_image = nil;
if (t_success)
t_success = MCGImageCreateWithRasterNoCopy(p_mask, t_mask_image);
if (t_success)
{
// IM-2013-09-11: [[ ResIndependence ]] Apply scaled mask to target raster.
// Drawing the mask directly will not work as the effective shape of the drawing operation
// will be defined by the opaque parts of the mask - areas outside will be unaffected. Instead we
// draw a solid rectangle over the intended areas using the mask as a pattern.
MCGFloat t_scale;
t_scale = MCResGetPixelScale();
MCGContextSetFillPattern(t_gcontext, t_mask_image, MCGAffineTransformMakeScale(t_scale, t_scale), kMCGImageFilterNearest);
MCGContextTranslateCTM(t_gcontext, -(MCGFloat)p_x_origin, -(MCGFloat)p_y_origin);
MCGContextSetBlendMode(t_gcontext, kMCGBlendModeDestinationIn);
t_success = MCRegionForEachRect(p_region, __MCApplyMaskCallback, t_gcontext);
}
MCGImageRelease(t_mask_image);
MCGContextRelease(t_gcontext);
return t_success;
}
