bool MCGImageHasPartialTransparency(MCGImageRef self)
{
if (self == nil)
return false;
if (self->bitmap->isOpaque())
return false;
MCGRaster t_raster;
/* UNCHECKED */ MCGImageGetRaster(self, t_raster);
if (t_raster.format == kMCGRasterFormat_A)
return true;
uint8_t *t_row_ptr;
t_row_ptr = (uint8_t*)t_raster.pixels;
for (uint32_t y = 0; y < t_raster.height; y++)
{
uint32_t *t_pixel_ptr;
t_pixel_ptr = (uint32_t*)t_row_ptr;
for (uint32_t x = 0; x < t_raster.width; x++)
{
uint8_t t_alpha;
t_alpha = MCGPixelGetNativeAlpha(*t_pixel_ptr++);
if (t_alpha > 0 && t_alpha < 255)
return true;
}
t_row_ptr += t_raster.stride;
}
return false;
}
bool MCGImageImageRep::EnsureBitmap()
{
if (m_bitmap != nil)
return true;
bool t_success;
t_success = true;
MCGRaster t_raster;
if (t_success)
t_success = MCGImageGetRaster(m_frame.image, t_raster);
MCImageBitmap *t_bitmap;
t_bitmap = nil;
if (t_success)
t_success = MCImageBitmapCreateWithPixels(t_raster.pixels, t_raster.stride, t_raster.width, t_raster.height, t_bitmap);
if (t_success)
{
t_bitmap->has_alpha = t_bitmap->has_transparency = t_raster.format == kMCGRasterFormat_ARGB;
if (t_bitmap->has_transparency)
MCImageBitmapUnpremultiply(t_bitmap);
}
if (t_success)
m_bitmap = t_bitmap;
return t_success;
}
bool MCGImageCreateCGDataProvider(MCGImageRef p_src, const MCGIntegerRectangle &p_src_rect, CGDataProviderRef &r_data_provider)
{
MCAssert(p_src_rect.origin.x >= 0 && p_src_rect.origin.y >= 0);
MCAssert(p_src_rect.origin.x + p_src_rect.size.width <= (uint32_t)MCGImageGetWidth(p_src));
MCAssert(p_src_rect.origin.y + p_src_rect.size.height <= (uint32_t)MCGImageGetHeight(p_src));
bool t_success = true;
MCGRaster t_raster;
if (t_success)
t_success = MCGImageGetRaster(p_src, t_raster);
CGDataProviderRef t_data_provider;
t_data_provider = nil;
if (t_success)
{
const void *t_src_ptr;
t_src_ptr = MCGRasterGetPixelPtr(t_raster, p_src_rect.origin.x, p_src_rect.origin.y);
t_data_provider = CGDataProviderCreateWithData(p_src, t_src_ptr, p_src_rect.size.height * t_raster.stride, MCGImageDataProviderReleaseDataCallback);
t_success = t_data_provider != nil;
}
if (t_success)
{
MCGImageRetain(p_src);
r_data_provider = t_data_provider;
}
return t_success;
}
bool MCGImageToCGImage(MCGImageRef p_src, MCGRectangle p_src_rect, CGColorSpaceRef p_colorspace, bool p_copy, bool p_invert, CGImageRef &r_image)
{
MCGRaster t_raster;
if (!MCGImageGetRaster(p_src, t_raster))
return false;
return MCGRasterToCGImage(t_raster, p_src_rect, p_colorspace, p_copy, p_invert, r_image);
}
bool MCGImageGetPixel(MCGImageRef p_image, uint32_t x, uint32_t y, uint32_t &r_pixel)
{
MCGRaster t_raster;
if (!MCGImageGetRaster(p_image, t_raster) || x >= t_raster.width || y >= t_raster.height)
return false;
uint8_t* t_row_ptr;
t_row_ptr = ((uint8_t*)t_raster.pixels) + y * t_raster.stride;
if (t_raster.format == kMCGRasterFormat_A)
r_pixel = t_row_ptr[x];
else
r_pixel = ((uint32_t*)t_row_ptr)[x];
return true;
}
bool MCGImageToCGImage(MCGImageRef p_src, const MCGIntegerRectangle &p_src_rect, CGColorSpaceRef p_colorspace, bool p_invert, CGImageRef &r_image)
{
MCGRaster t_raster;
if (!MCGImageGetRaster(p_src, t_raster))
return false;
if (p_invert)
{
return MCGRasterToCGImage(t_raster, p_src_rect, p_colorspace, true, true, r_image);
}
// If we don't need to modify the data then create image with data provider that references the MCGImageRef
bool t_success = true;
CGImageRef t_image = nil;
CGDataProviderRef t_data_provider = nil;
if (t_success)
t_success = MCGImageCreateCGDataProvider(p_src, p_src_rect, t_data_provider);
bool t_alpha;
t_alpha = !MCGImageIsOpaque(p_src);
CGBitmapInfo t_bm_info;
t_bm_info = MCGPixelFormatToCGBitmapInfo(kMCGPixelFormatNative, t_alpha);
if (t_success)
{
t_image = CGImageCreate(p_src_rect.size.width, p_src_rect.size.height, 8, 32, t_raster.stride, p_colorspace, t_bm_info, t_data_provider, nil, true, kCGRenderingIntentDefault);
t_success = t_image != nil;
}
CGDataProviderRelease(t_data_provider);
if (t_success)
r_image = t_image;
return t_success;
}