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* Copyright 2015 Google Inc.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
#ifndef SkMasks_DEFINED
#define SkMasks_DEFINED
#include "include/core/SkTypes.h"
#include <cstdint>
// Contains useful mask routines for SkMaskSwizzler
class SkMasks {
//Contains all of the information for a single mask
struct MaskInfo {
uint32_t mask;
uint32_t shift; // To the left
uint32_t size; // Of mask width
constexpr SkMasks(const MaskInfo red, const MaskInfo green, const MaskInfo blue,
const MaskInfo alpha)
: fRed(red)
, fGreen(green)
, fBlue(blue)
, fAlpha(alpha) { }
//Input bit masks format
struct InputMasks {
uint32_t red;
uint32_t green;
uint32_t blue;
uint32_t alpha;
// Create the masks object
static SkMasks* CreateMasks(InputMasks masks, int bytesPerPixel);
// Get a color component
uint8_t getRed(uint32_t pixel) const;
uint8_t getGreen(uint32_t pixel) const;
uint8_t getBlue(uint32_t pixel) const;
uint8_t getAlpha(uint32_t pixel) const;
// Getter for the alpha mask
// The alpha mask may be used in other decoding modes
uint32_t getAlphaMask() const {
return fAlpha.mask;
const MaskInfo fRed;
const MaskInfo fGreen;
const MaskInfo fBlue;
const MaskInfo fAlpha;