7b8400dad2
This is much more explicit about what that type represents (are we in legacy mode or not), which also makes it suitable for other (upcoming) usage. BUG=skia: GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4529 Change-Id: Iacb397c34e7765f1ca86c0195bc622b2be4d9acf Reviewed-on: https://skia-review.googlesource.com/4529 Commit-Queue: Brian Osman <brianosman@google.com> Reviewed-by: Brian Salomon <bsalomon@google.com>
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 SkDestinationSurfaceColorMode {
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kLegacy,
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kGammaAndColorSpaceAware,
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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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