alloc
Sets ImageInfo to info following the rules in setImageInfo() and allocates pixel memory. rowBytes must equal or exceed info.width() times info.bytesPerPixel(), or equal zero.
Returns false and calls reset() if ImageInfo could not be set, or memory could not be allocated.
On most platforms, allocating pixel memory may succeed even though there is not sufficient memory to hold pixels; allocation does not take place until the pixels are written to. The actual behavior depends on the platform implementation of malloc().
Return
true if pixel storage is allocated
Parameters
contains width, height, ColorAlphaType, ColorType, ColorSpace
size of pixel row or larger; may be zero
Sets ImageInfo to info following the rules in .setImageInfo and allocates pixel memory.
Returns false and calls reset() if ImageInfo could not be set, or memory could not be allocated.
On most platforms, allocating pixel memory may succeed even though there is not sufficient memory to hold pixels; allocation does not take place until the pixels are written to. The actual behavior depends on the platform implementation of malloc().
Return
true if pixel storage is allocated
Parameters
contains width, height, ColorAlphaType, ColorType, ColorSpace
See also
Allocates pixel memory with HeapAllocator, and replaces existing PixelRef. The allocation size is determined by ImageInfo width, height, and ColorType.
Returns false if info().colorType() is ColorType.UNKNOWN, or allocation fails.
Return
true if the allocation succeeds