7039f74a8b
Our internal definition is (and will continue to be) that anything with a color space is gamma correct. F16 is irrelevant (whether or not we choose to support untagged F16). This makes these helpers less than helpful, and lets us remove them from (public) API. API change is just removal (of unused functions). TBR=reed@google.com BUG=skia: GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4228 Change-Id: Ia84a423548bfee14a3ba4a43d6d5b8c4686fb5ff Reviewed-on: https://skia-review.googlesource.com/4228 Commit-Queue: Brian Osman <brianosman@google.com> Reviewed-by: Mike Klein <mtklein@chromium.org>
352 lines
10 KiB
C++
352 lines
10 KiB
C++
/*
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* Copyright 2013 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkImageInfo_DEFINED
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#define SkImageInfo_DEFINED
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#include "SkColorSpace.h"
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#include "SkMath.h"
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#include "SkRect.h"
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#include "SkSize.h"
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class SkReadBuffer;
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class SkWriteBuffer;
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/**
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* Describes how to interpret the alpha component of a pixel.
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*/
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enum SkAlphaType {
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kUnknown_SkAlphaType,
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/**
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* All pixels are stored as opaque. This differs slightly from kIgnore in
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* that kOpaque has correct "opaque" values stored in the pixels, while
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* kIgnore may not, but in both cases the caller should treat the pixels
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* as opaque.
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*/
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kOpaque_SkAlphaType,
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/**
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* All pixels have their alpha premultiplied in their color components.
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* This is the natural format for the rendering target pixels.
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*/
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kPremul_SkAlphaType,
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/**
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* All pixels have their color components stored without any regard to the
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* alpha. e.g. this is the default configuration for PNG images.
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*
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* This alpha-type is ONLY supported for input images. Rendering cannot
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* generate this on output.
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*/
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kUnpremul_SkAlphaType,
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kLastEnum_SkAlphaType = kUnpremul_SkAlphaType
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};
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static inline bool SkAlphaTypeIsOpaque(SkAlphaType at) {
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return kOpaque_SkAlphaType == at;
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}
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static inline bool SkAlphaTypeIsValid(unsigned value) {
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return value <= kLastEnum_SkAlphaType;
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}
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///////////////////////////////////////////////////////////////////////////////
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/**
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* Describes how to interpret the components of a pixel.
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*
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* kN32_SkColorType is an alias for whichever 32bit ARGB format is the "native"
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* form for skia's blitters. Use this if you don't have a swizzle preference
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* for 32bit pixels.
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*/
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enum SkColorType {
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kUnknown_SkColorType,
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kAlpha_8_SkColorType,
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kRGB_565_SkColorType,
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kARGB_4444_SkColorType,
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kRGBA_8888_SkColorType,
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kBGRA_8888_SkColorType,
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kIndex_8_SkColorType,
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kGray_8_SkColorType,
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kRGBA_F16_SkColorType,
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kLastEnum_SkColorType = kRGBA_F16_SkColorType,
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#if SK_PMCOLOR_BYTE_ORDER(B,G,R,A)
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kN32_SkColorType = kBGRA_8888_SkColorType,
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#elif SK_PMCOLOR_BYTE_ORDER(R,G,B,A)
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kN32_SkColorType = kRGBA_8888_SkColorType,
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#else
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#error "SK_*32_SHFIT values must correspond to BGRA or RGBA byte order"
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#endif
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};
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static int SkColorTypeBytesPerPixel(SkColorType ct) {
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static const uint8_t gSize[] = {
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0, // Unknown
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1, // Alpha_8
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2, // RGB_565
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2, // ARGB_4444
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4, // RGBA_8888
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4, // BGRA_8888
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1, // kIndex_8
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1, // kGray_8
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8, // kRGBA_F16
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};
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static_assert(SK_ARRAY_COUNT(gSize) == (size_t)(kLastEnum_SkColorType + 1),
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"size_mismatch_with_SkColorType_enum");
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SkASSERT((size_t)ct < SK_ARRAY_COUNT(gSize));
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return gSize[ct];
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}
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static int SkColorTypeShiftPerPixel(SkColorType ct) {
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static const uint8_t gShift[] = {
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0, // Unknown
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0, // Alpha_8
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1, // RGB_565
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1, // ARGB_4444
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2, // RGBA_8888
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2, // BGRA_8888
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0, // kIndex_8
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0, // kGray_8
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3, // kRGBA_F16
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};
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static_assert(SK_ARRAY_COUNT(gShift) == (size_t)(kLastEnum_SkColorType + 1),
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"size_mismatch_with_SkColorType_enum");
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SkASSERT((size_t)ct < SK_ARRAY_COUNT(gShift));
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return gShift[ct];
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}
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static inline size_t SkColorTypeMinRowBytes(SkColorType ct, int width) {
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return width * SkColorTypeBytesPerPixel(ct);
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}
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static inline bool SkColorTypeIsValid(unsigned value) {
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return value <= kLastEnum_SkColorType;
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}
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static inline size_t SkColorTypeComputeOffset(SkColorType ct, int x, int y, size_t rowBytes) {
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if (kUnknown_SkColorType == ct) {
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return 0;
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}
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return y * rowBytes + (x << SkColorTypeShiftPerPixel(ct));
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}
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///////////////////////////////////////////////////////////////////////////////
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/**
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* Return true if alphaType is supported by colorType. If there is a canonical
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* alphaType for this colorType, return it in canonical.
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*/
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bool SkColorTypeValidateAlphaType(SkColorType colorType, SkAlphaType alphaType,
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SkAlphaType* canonical = NULL);
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///////////////////////////////////////////////////////////////////////////////
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/**
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* Describes the color space a YUV pixel.
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*/
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enum SkYUVColorSpace {
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/** Standard JPEG color space. */
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kJPEG_SkYUVColorSpace,
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/** SDTV standard Rec. 601 color space. Uses "studio swing" [16, 235] color
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range. See http://en.wikipedia.org/wiki/Rec._601 for details. */
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kRec601_SkYUVColorSpace,
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/** HDTV standard Rec. 709 color space. Uses "studio swing" [16, 235] color
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range. See http://en.wikipedia.org/wiki/Rec._709 for details. */
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kRec709_SkYUVColorSpace,
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kLastEnum_SkYUVColorSpace = kRec709_SkYUVColorSpace
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};
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///////////////////////////////////////////////////////////////////////////////
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enum class SkSourceGammaTreatment {
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kRespect,
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kIgnore,
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};
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/**
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* Describe an image's dimensions and pixel type.
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* Used for both src images and render-targets (surfaces).
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*/
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struct SK_API SkImageInfo {
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public:
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SkImageInfo()
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: fColorSpace(nullptr)
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, fWidth(0)
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, fHeight(0)
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, fColorType(kUnknown_SkColorType)
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, fAlphaType(kUnknown_SkAlphaType)
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{}
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static SkImageInfo Make(int width, int height, SkColorType ct, SkAlphaType at,
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sk_sp<SkColorSpace> cs = nullptr) {
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return SkImageInfo(width, height, ct, at, std::move(cs));
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}
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/**
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* Sets colortype to the native ARGB32 type.
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*/
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static SkImageInfo MakeN32(int width, int height, SkAlphaType at,
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sk_sp<SkColorSpace> cs = nullptr) {
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return Make(width, height, kN32_SkColorType, at, cs);
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}
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/**
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* Create an ImageInfo marked as SRGB with N32 swizzle.
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*/
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static SkImageInfo MakeS32(int width, int height, SkAlphaType at);
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/**
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* Sets colortype to the native ARGB32 type, and the alphatype to premul.
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*/
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static SkImageInfo MakeN32Premul(int width, int height, sk_sp<SkColorSpace> cs = nullptr) {
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return Make(width, height, kN32_SkColorType, kPremul_SkAlphaType, cs);
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}
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static SkImageInfo MakeN32Premul(const SkISize& size) {
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return MakeN32Premul(size.width(), size.height());
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}
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static SkImageInfo MakeA8(int width, int height) {
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return Make(width, height, kAlpha_8_SkColorType, kPremul_SkAlphaType, nullptr);
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}
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static SkImageInfo MakeUnknown(int width, int height) {
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return Make(width, height, kUnknown_SkColorType, kUnknown_SkAlphaType, nullptr);
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}
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static SkImageInfo MakeUnknown() {
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return MakeUnknown(0, 0);
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}
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int width() const { return fWidth; }
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int height() const { return fHeight; }
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SkColorType colorType() const { return fColorType; }
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SkAlphaType alphaType() const { return fAlphaType; }
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SkColorSpace* colorSpace() const { return fColorSpace.get(); }
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bool isEmpty() const { return fWidth <= 0 || fHeight <= 0; }
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bool isOpaque() const {
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return SkAlphaTypeIsOpaque(fAlphaType);
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}
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SkISize dimensions() const { return SkISize::Make(fWidth, fHeight); }
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SkIRect bounds() const { return SkIRect::MakeWH(fWidth, fHeight); }
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bool gammaCloseToSRGB() const {
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return fColorSpace && fColorSpace->gammaCloseToSRGB();
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}
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/**
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* Return a new ImageInfo with the same colortype and alphatype as this info,
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* but with the specified width and height.
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*/
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SkImageInfo makeWH(int newWidth, int newHeight) const {
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return Make(newWidth, newHeight, fColorType, fAlphaType, fColorSpace);
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}
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SkImageInfo makeAlphaType(SkAlphaType newAlphaType) const {
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return Make(fWidth, fHeight, fColorType, newAlphaType, fColorSpace);
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}
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SkImageInfo makeColorType(SkColorType newColorType) const {
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return Make(fWidth, fHeight, newColorType, fAlphaType, fColorSpace);
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}
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SkImageInfo makeColorSpace(sk_sp<SkColorSpace> cs) const {
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return Make(fWidth, fHeight, fColorType, fAlphaType, std::move(cs));
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}
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int bytesPerPixel() const { return SkColorTypeBytesPerPixel(fColorType); }
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int shiftPerPixel() const { return SkColorTypeShiftPerPixel(fColorType); }
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uint64_t minRowBytes64() const {
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return sk_64_mul(fWidth, this->bytesPerPixel());
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}
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size_t minRowBytes() const {
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uint64_t minRowBytes = this->minRowBytes64();
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if (!sk_64_isS32(minRowBytes)) {
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return 0;
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}
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return sk_64_asS32(minRowBytes);
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}
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size_t computeOffset(int x, int y, size_t rowBytes) const {
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SkASSERT((unsigned)x < (unsigned)fWidth);
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SkASSERT((unsigned)y < (unsigned)fHeight);
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return SkColorTypeComputeOffset(fColorType, x, y, rowBytes);
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}
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bool operator==(const SkImageInfo& other) const {
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return fWidth == other.fWidth && fHeight == other.fHeight &&
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fColorType == other.fColorType && fAlphaType == other.fAlphaType &&
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SkColorSpace::Equals(fColorSpace.get(), other.fColorSpace.get());
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}
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bool operator!=(const SkImageInfo& other) const {
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return !(*this == other);
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}
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void unflatten(SkReadBuffer&);
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void flatten(SkWriteBuffer&) const;
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int64_t getSafeSize64(size_t rowBytes) const {
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if (0 == fHeight) {
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return 0;
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}
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return sk_64_mul(fHeight - 1, rowBytes) + sk_64_mul(fWidth, this->bytesPerPixel());
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}
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size_t getSafeSize(size_t rowBytes) const {
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int64_t size = this->getSafeSize64(rowBytes);
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if (!sk_64_isS32(size)) {
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return 0;
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}
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return sk_64_asS32(size);
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}
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bool validRowBytes(size_t rowBytes) const {
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uint64_t rb = sk_64_mul(fWidth, this->bytesPerPixel());
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return rowBytes >= rb;
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}
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void reset() {
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fColorSpace = nullptr;
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fWidth = 0;
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fHeight = 0;
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fColorType = kUnknown_SkColorType;
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fAlphaType = kUnknown_SkAlphaType;
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}
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SkDEBUGCODE(void validate() const;)
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private:
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sk_sp<SkColorSpace> fColorSpace;
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int fWidth;
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int fHeight;
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SkColorType fColorType;
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SkAlphaType fAlphaType;
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SkImageInfo(int width, int height, SkColorType ct, SkAlphaType at, sk_sp<SkColorSpace> cs)
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: fColorSpace(std::move(cs))
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, fWidth(width)
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, fHeight(height)
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, fColorType(ct)
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, fAlphaType(at)
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{}
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};
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#endif
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