123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121 |
- /*
- * Copyright 2017 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
- #ifndef SkImageInfoPriv_DEFINED
- #define SkImageInfoPriv_DEFINED
- #include "include/core/SkImageInfo.h"
- enum SkColorTypeComponentFlag {
- kRed_SkColorTypeComponentFlag = 0x1,
- kGreen_SkColorTypeComponentFlag = 0x2,
- kBlue_SkColorTypeComponentFlag = 0x4,
- kAlpha_SkColorTypeComponentFlag = 0x8,
- kGray_SkColorTypeComponentFlag = 0x10,
- kRGB_SkColorTypeComponentFlags = kRed_SkColorTypeComponentFlag |
- kGreen_SkColorTypeComponentFlag |
- kBlue_SkColorTypeComponentFlag,
- kRGBA_SkColorTypeComponentFlags = kRGB_SkColorTypeComponentFlags |
- kAlpha_SkColorTypeComponentFlag,
- };
- static inline uint32_t SkColorTypeComponentFlags(SkColorType ct) {
- switch (ct) {
- case kUnknown_SkColorType: return 0;
- case kAlpha_8_SkColorType: return kAlpha_SkColorTypeComponentFlag;
- case kRGB_565_SkColorType: return kRGB_SkColorTypeComponentFlags;
- case kARGB_4444_SkColorType: return kRGBA_SkColorTypeComponentFlags;
- case kRGBA_8888_SkColorType: return kRGBA_SkColorTypeComponentFlags;
- case kRGB_888x_SkColorType: return kRGB_SkColorTypeComponentFlags;
- case kBGRA_8888_SkColorType: return kRGBA_SkColorTypeComponentFlags;
- case kRGBA_1010102_SkColorType: return kRGBA_SkColorTypeComponentFlags;
- case kRGB_101010x_SkColorType: return kRGB_SkColorTypeComponentFlags;
- case kGray_8_SkColorType: return kGray_SkColorTypeComponentFlag;
- case kRGBA_F16Norm_SkColorType: return kRGBA_SkColorTypeComponentFlags;
- case kRGBA_F16_SkColorType: return kRGBA_SkColorTypeComponentFlags;
- case kRGBA_F32_SkColorType: return kRGBA_SkColorTypeComponentFlags;
- }
- return 0;
- }
- static inline bool SkColorTypeIsAlphaOnly(SkColorType ct) {
- return kAlpha_SkColorTypeComponentFlag == SkColorTypeComponentFlags(ct);
- }
- static inline bool SkAlphaTypeIsValid(unsigned value) {
- return value <= kLastEnum_SkAlphaType;
- }
- static inline bool SkColorTypeIsGray(SkColorType ct) {
- auto flags = SkColorTypeComponentFlags(ct);
- // Currently assuming that a color type has only gray or does not have gray.
- SkASSERT(!(kGray_SkColorTypeComponentFlag & flags) || kGray_SkColorTypeComponentFlag == flags);
- return kGray_SkColorTypeComponentFlag == flags;
- }
- static int SkColorTypeShiftPerPixel(SkColorType ct) {
- switch (ct) {
- case kUnknown_SkColorType: return 0;
- case kAlpha_8_SkColorType: return 0;
- case kRGB_565_SkColorType: return 1;
- case kARGB_4444_SkColorType: return 1;
- case kRGBA_8888_SkColorType: return 2;
- case kRGB_888x_SkColorType: return 2;
- case kBGRA_8888_SkColorType: return 2;
- case kRGBA_1010102_SkColorType: return 2;
- case kRGB_101010x_SkColorType: return 2;
- case kGray_8_SkColorType: return 0;
- case kRGBA_F16Norm_SkColorType: return 3;
- case kRGBA_F16_SkColorType: return 3;
- case kRGBA_F32_SkColorType: return 4;
- }
- return 0;
- }
- static inline size_t SkColorTypeMinRowBytes(SkColorType ct, int width) {
- return width * SkColorTypeBytesPerPixel(ct);
- }
- static inline bool SkColorTypeIsValid(unsigned value) {
- return value <= kLastEnum_SkColorType;
- }
- static inline size_t SkColorTypeComputeOffset(SkColorType ct, int x, int y, size_t rowBytes) {
- if (kUnknown_SkColorType == ct) {
- return 0;
- }
- return y * rowBytes + (x << SkColorTypeShiftPerPixel(ct));
- }
- /**
- * Returns true if |info| contains a valid combination of width, height, colorType, and alphaType.
- */
- static inline bool SkImageInfoIsValid(const SkImageInfo& info) {
- if (info.width() <= 0 || info.height() <= 0) {
- return false;
- }
- const int kMaxDimension = SK_MaxS32 >> 2;
- if (info.width() > kMaxDimension || info.height() > kMaxDimension) {
- return false;
- }
- if (kUnknown_SkColorType == info.colorType() || kUnknown_SkAlphaType == info.alphaType()) {
- return false;
- }
- return true;
- }
- /**
- * Returns true if Skia has defined a pixel conversion from the |src| to the |dst|.
- * Returns false otherwise.
- */
- static inline bool SkImageInfoValidConversion(const SkImageInfo& dst, const SkImageInfo& src) {
- return SkImageInfoIsValid(dst) && SkImageInfoIsValid(src);
- }
- #endif // SkImageInfoPriv_DEFINED
|