(PIX_MASK_DRAW, PIX_MASK_RETAIN) [USE_MAC_IMAGE_IO]:

(PIX_MASK_DRAW, PIX_MASK_RETAIN) [USE_MAC_IMAGE_IO]:
New definitions for Image I/O support.
(XGetImage, XPutPixel, XGetPixel, XDestroyImage)
(mac_create_cg_image_from_image, x_create_x_image_and_pixmap)
[USE_MAC_IMAGE_IO]: Add implementations for Image I/O support.
(mac_data_provider_release_data, image_load_image_io)
[USE_MAC_IMAGE_IO]: New functions.
(CGImageCreateWithPNGDataProviderProcType) [MAC_OSX]: Remove typedef.
(MyCGImageCreateWithPNGDataProvider) [MAC_OSX]: Remove variable.
(init_image_func_pointer) [MAC_OSX]: Remove function.
(image_load_quartz2d) [MAC_OSX]: Check availability of
CGImageCreateWithPNGDataProvider at compile time.
Use lowercase `false' for boolean constant.
(png_load, jpeg_load, tiff_load, gif_load) [USE_MAC_IMAGE_IO]:
Use image_load_image_io.
(png_load) [!USE_MAC_IMAGE_IO && MAC_OSX]:
Don't check MyCGImageCreateWithPNGDataProvider.
(init_image) [MAC_OSX && TARGET_API_MAC_CARBON]:
Don't call init_image_func_pointer.