def createMaskFromAlphaOnlyContext(alphaContext):
rasterData = _rasterDataForContext[alphaContext]
# We own the data, hence remove from the mapping
del _rasterDataForContext[alphaContext]
imageDataSize = Quartz.CGBitmapContextGetBytesPerRow(
alphaContext) * Quartz.CGBitmapContextGetHeight(alphaContext)
invertDecode = [1.0, 0.0]
# Create the data provider from the image data.
dataProvider = Quartz.CGDataProviderCreateWithData(None, rasterData,
imageDataSize, None)
if dataProvider is None:
print("Couldn't create data provider!")
return None
mask = Quartz.CGImageMaskCreate(
Quartz.CGBitmapContextGetWidth(alphaContext),
Quartz.CGBitmapContextGetHeight(alphaContext),
Quartz.CGBitmapContextGetBitsPerComponent(alphaContext),
Quartz.CGBitmapContextGetBitsPerPixel(alphaContext),
Quartz.CGBitmapContextGetBytesPerRow(alphaContext),
dataProvider,
# The decode is an inverted decode since a mask has the opposite
# sense than alpha, i.e. 0 in a mask paints 100% and 1 in a mask
# paints nothing.
invertDecode,
True)
if mask is None:
print("Couldn't create image mask!")
return None
return mask
def createImageFromBitmapContext(c):
rasterData = _rasterDataForContext[c]
# We own the data, hence remove from the mapping
del _rasterDataForContext[c]
imageDataSize = Quartz.CGBitmapContextGetBytesPerRow(
c) * Quartz.CGBitmapContextGetHeight(c)
if rasterData is None:
fprintf(stderr, "Context is not a bitmap context!")
# Create the data provider from the image data
dataProvider = Quartz.CGDataProviderCreateWithData(None, rasterData,
imageDataSize, None)
if dataProvider is None:
print("Couldn't create data provider!")
return None
# Now create the image. The parameters for the image closely match
# the parameters of the bitmap context. This code uses a NULL
# decode array and shouldInterpolate is true.
image = Quartz.CGImageCreate(Quartz.CGBitmapContextGetWidth(c),
Quartz.CGBitmapContextGetHeight(c),
Quartz.CGBitmapContextGetBitsPerComponent(c),
Quartz.CGBitmapContextGetBitsPerPixel(c),
Quartz.CGBitmapContextGetBytesPerRow(c),
Quartz.CGBitmapContextGetColorSpace(c),
myCGContextGetBitmapInfo(c), dataProvider,
None, True, Quartz.kCGRenderingIntentDefault)
if image is None:
print("Couldn't create image!")
return None
return image
def testFunctions(self):
bytes_val = array.array("B", (0 for i in range(100 * 80 * 4)))
self.assertIsInstance(bytes_val, array.array)
self.assertEqual(len(bytes_val), 100 * 80 * 4)
ctx = Quartz.CGBitmapContextCreate(
bytes_val,
100,
80,
8,
400,
Quartz.CGColorSpaceCreateDeviceRGB(),
Quartz.kCGImageAlphaPremultipliedLast,
)
self.assertIsInstance(ctx, Quartz.CGContextRef)
buf = Quartz.CGBitmapContextGetData(ctx)
self.assertIsInstance(buf, objc.varlist)
self.assertIsInstance(buf[0], bytes)
self.assertEqual(Quartz.CGBitmapContextGetWidth(ctx), 100)
self.assertEqual(Quartz.CGBitmapContextGetHeight(ctx), 80)
self.assertEqual(Quartz.CGBitmapContextGetBitsPerComponent(ctx), 8)
self.assertEqual(Quartz.CGBitmapContextGetBitsPerPixel(ctx), 32)
self.assertEqual(Quartz.CGBitmapContextGetBytesPerRow(ctx), 400)
v = Quartz.CGBitmapContextGetColorSpace(ctx)
self.assertIsInstance(v, Quartz.CGColorSpaceRef)
v = Quartz.CGBitmapContextGetAlphaInfo(ctx)
self.assertIsInstance(v, int)
v = Quartz.CGBitmapContextGetBitmapInfo(ctx)
self.assertIsInstance(v, int)
img = Quartz.CGBitmapContextCreateImage(ctx)
self.assertIsInstance(img, Quartz.CGImageRef)
