| /* |
| * Copyright 2016 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file |
| */ |
| |
| #ifndef SkSpecialImage_DEFINED |
| #define SkSpecialImage_DEFINED |
| |
| #include "include/core/SkImageInfo.h" |
| #include "include/core/SkRect.h" |
| #include "include/core/SkRefCnt.h" |
| #include "include/core/SkSamplingOptions.h" |
| #include "include/core/SkScalar.h" |
| #include "include/core/SkSize.h" |
| #include "include/core/SkSurfaceProps.h" |
| |
| #include <cstddef> |
| #include <cstdint> |
| |
| class GrRecordingContext; |
| class SkBitmap; |
| class SkCanvas; |
| class SkColorSpace; |
| class SkImage; |
| class SkMatrix; |
| class SkPaint; |
| class SkShader; |
| enum SkAlphaType : int; |
| enum SkColorType : int; |
| enum class SkTileMode; |
| |
| enum { |
| kNeedNewImageUniqueID_SpecialImage = 0 |
| }; |
| |
| /** |
| * This is a restricted form of SkImage solely intended for internal use. It |
| * differs from SkImage in that: |
| * - it can only be backed by raster or gpu (no generators) |
| * - it can be backed by a GrTextureProxy larger than its nominal bounds |
| * - it can't be drawn tiled |
| * - it can't be drawn with MIPMAPs |
| * It is similar to SkImage in that it abstracts how the pixels are stored/represented. |
| * |
| * Note: the contents of the backing storage outside of the subset rect are undefined. |
| */ |
| class SkSpecialImage : public SkRefCnt { |
| public: |
| typedef void* ReleaseContext; |
| typedef void(*RasterReleaseProc)(void* pixels, ReleaseContext); |
| |
| const SkSurfaceProps& props() const { return fProps; } |
| |
| int width() const { return fSubset.width(); } |
| int height() const { return fSubset.height(); } |
| SkISize dimensions() const { return { this->width(), this->height() }; } |
| const SkIRect& subset() const { return fSubset; } |
| |
| uint32_t uniqueID() const { return fUniqueID; } |
| |
| virtual size_t getSize() const = 0; |
| |
| const SkColorInfo& colorInfo() const { return fColorInfo; } |
| SkAlphaType alphaType() const { return fColorInfo.alphaType(); } |
| SkColorType colorType() const { return fColorInfo.colorType(); } |
| SkColorSpace* getColorSpace() const { return fColorInfo.colorSpace(); } |
| |
| /** |
| * Draw this SpecialImage into the canvas, automatically taking into account the image's subset |
| */ |
| void draw(SkCanvas* canvas, |
| SkScalar x, SkScalar y, |
| const SkSamplingOptions& sampling, |
| const SkPaint* paint, |
| bool strict = true) const; |
| void draw(SkCanvas* canvas, SkScalar x, SkScalar y) const { |
| this->draw(canvas, x, y, SkSamplingOptions(), nullptr); |
| } |
| |
| /** |
| * Extract a subset of this special image and return it as a special image. |
| * It may or may not point to the same backing memory. The input 'subset' is relative to the |
| * special image's content rect. |
| */ |
| sk_sp<SkSpecialImage> makeSubset(const SkIRect& subset) const { |
| SkIRect absolute = subset.makeOffset(this->subset().topLeft()); |
| return this->onMakeSubset(absolute); |
| } |
| |
| /** |
| * Create an SkImage view of the contents of this special image, pointing to the same |
| * underlying memory. |
| * |
| * TODO: If SkImages::MakeFiltered were to return an SkShader that accounted for the subset |
| * constraint and offset, then this could move to a private virtual for use in draw() and |
| * asShader(). |
| */ |
| virtual sk_sp<SkImage> asImage() const = 0; |
| |
| /** |
| * Create an SkShader that samples the contents of this special image, applying tile mode for |
| * any sample that falls outside its internal subset. |
| */ |
| sk_sp<SkShader> asShader(SkTileMode, const SkSamplingOptions&, const SkMatrix& lm) const; |
| /** |
| * Create an SkShader that samples the contents of this special image, assuming that the |
| * coords it's evaluated at will not access pixels beyond its subset |
| * (i.e., non-strict sampling). |
| */ |
| sk_sp<SkShader> asShaderFast(const SkSamplingOptions& sampling, const SkMatrix& lm) const; |
| |
| /** |
| * If the SpecialImage is backed by a gpu texture, return true. |
| */ |
| virtual bool isGaneshBacked() const { return false; } |
| virtual bool isGraphiteBacked() const { return false; } |
| |
| /** |
| * Return the GrRecordingContext if the SkSpecialImage is GrTexture-backed |
| */ |
| virtual GrRecordingContext* getContext() const { return nullptr; } |
| |
| protected: |
| SkSpecialImage(const SkIRect& subset, |
| uint32_t uniqueID, |
| const SkColorInfo&, |
| const SkSurfaceProps&); |
| |
| // This subset is relative to the backing store's coordinate frame, it has already been mapped |
| // from the content rect by the non-virtual makeSubset(). |
| virtual sk_sp<SkSpecialImage> onMakeSubset(const SkIRect& subset) const = 0; |
| |
| // The default implementation calls `asImage()` or `SkImageShader::MakeSubset` based on `strict` |
| virtual sk_sp<SkShader> onAsShader(SkTileMode, |
| const SkSamplingOptions&, |
| const SkMatrix&, |
| bool strict) const; |
| |
| private: |
| const SkIRect fSubset; |
| const uint32_t fUniqueID; |
| const SkColorInfo fColorInfo; |
| const SkSurfaceProps fProps; |
| }; |
| |
| namespace SkSpecialImages { |
| |
| sk_sp<SkSpecialImage> MakeFromRaster(const SkIRect& subset, sk_sp<SkImage>, const SkSurfaceProps&); |
| sk_sp<SkSpecialImage> MakeFromRaster(const SkIRect& subset, const SkBitmap&, const SkSurfaceProps&); |
| sk_sp<SkSpecialImage> CopyFromRaster(const SkIRect& subset, const SkBitmap&, const SkSurfaceProps&); |
| |
| bool AsBitmap(const SkSpecialImage* img, SkBitmap*); |
| |
| } // namespace SkSpecialImages |
| |
| #endif // SkSpecialImage_DEFINED |