| /* |
| * 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 "SkNextID.h" |
| #include "SkRefCnt.h" |
| |
| // remove this when internal_getProxy goes away (see skbug.com/4965) |
| #include "SkImageFilter.h" |
| |
| #include "SkImageInfo.h" // for SkAlphaType |
| |
| class GrContext; |
| class GrTexture; |
| class SkBitmap; |
| class SkCanvas; |
| class SkImage; |
| struct SkImageInfo; |
| class SkPaint; |
| class SkPixmap; |
| class SkSpecialSurface; |
| class SkSurface; |
| |
| 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 GrTexture 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); |
| |
| int width() const { return fSubset.width(); } |
| int height() const { return fSubset.height(); } |
| const SkIRect& subset() const { return fSubset; } |
| |
| uint32_t uniqueID() const { return fUniqueID; } |
| virtual bool isOpaque() const { return false; } |
| virtual size_t getSize() const = 0; |
| |
| /** |
| * Ensures that a special image is backed by a texture (when GrContext is non-null). If no |
| * transformation is required, the returned image may be the same as this special image. |
| * If this special image is from a different GrContext, this will fail. |
| */ |
| sk_sp<SkSpecialImage> makeTextureImage(SkImageFilter::Proxy*, GrContext*); |
| |
| /** |
| * Draw this SpecialImage into the canvas. |
| */ |
| void draw(SkCanvas*, SkScalar x, SkScalar y, const SkPaint*) const; |
| |
| static sk_sp<SkSpecialImage> MakeFromImage(SkImageFilter::Proxy*, |
| const SkIRect& subset, |
| sk_sp<SkImage>); |
| static sk_sp<SkSpecialImage> MakeFromRaster(SkImageFilter::Proxy*, |
| const SkIRect& subset, |
| const SkBitmap&); |
| static sk_sp<SkSpecialImage> MakeFromGpu(SkImageFilter::Proxy*, |
| const SkIRect& subset, |
| uint32_t uniqueID, |
| GrTexture*, |
| SkAlphaType at = kPremul_SkAlphaType); |
| static sk_sp<SkSpecialImage> MakeFromPixmap(SkImageFilter::Proxy*, |
| const SkIRect& subset, |
| const SkPixmap&, |
| RasterReleaseProc, |
| ReleaseContext); |
| |
| /** |
| * Create a new special surface with a backend that is compatible with this special image. |
| */ |
| sk_sp<SkSpecialSurface> makeSurface(const SkImageInfo&) const; |
| |
| /** |
| * Create a new surface with a backend that is compatible with this special image. |
| * TODO: switch this to makeSurface once we resolved the naming issue |
| */ |
| sk_sp<SkSurface> makeTightSurface(const SkImageInfo&) const; |
| |
| /** |
| * 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. |
| */ |
| sk_sp<SkSpecialImage> makeSubset(const SkIRect& subset) const; |
| |
| /** |
| * Extract a subset of this special image and return it as an SkImage. |
| * It may or may not point to the same backing memory. |
| * TODO: switch this to makeSurface once we resolved the naming issue |
| */ |
| sk_sp<SkImage> makeTightSubset(const SkIRect& subset) const; |
| |
| // These three internal methods will go away (see skbug.com/4965) |
| bool internal_getBM(SkBitmap* result); |
| static sk_sp<SkSpecialImage> internal_fromBM(SkImageFilter::Proxy*, const SkBitmap&); |
| SkImageFilter::Proxy* internal_getProxy() const; |
| |
| // TODO: hide this when GrLayerHoister uses SkSpecialImages more fully (see skbug.com/5063) |
| /** |
| * If the SpecialImage is backed by a gpu texture, return that texture. |
| * The active portion of the texture can be retrieved via 'subset'. |
| */ |
| GrTexture* peekTexture() const; |
| |
| // TODO: hide this whe the imagefilter all have a consistent draw path (see skbug.com/5063) |
| /** |
| * If the SpecialImage is backed by cpu pixels, return the const address |
| * of those pixels and, if not null, the ImageInfo, rowBytes, and, if present, |
| * the color table. The returned address(es) is/are only valid while the image object |
| * is in scope. |
| * |
| * The returned ImageInfo represents the backing memory. Use 'subset' |
| * to get the active portion's dimensions. |
| * |
| * On failure, return false and ignore the pixmap parameter. |
| */ |
| bool peekPixels(SkPixmap*) const; |
| |
| protected: |
| SkSpecialImage(SkImageFilter::Proxy* proxy, const SkIRect& subset, uint32_t uniqueID) |
| : fSubset(subset) |
| , fUniqueID(kNeedNewImageUniqueID_SpecialImage == uniqueID ? SkNextID::ImageID() |
| : uniqueID) |
| , fProxy(proxy) { |
| } |
| |
| // The following 2 are for testing and shouldn't be used. |
| friend class TestingSpecialImageAccess; |
| friend class TestingSpecialSurfaceAccess; |
| |
| // This entry point is for testing only. It does a readback from VRAM for |
| // GPU-backed special images. |
| bool testingOnlyGetROPixels(SkBitmap*) const; |
| |
| // TODO: remove this ASAP (see skbug.com/4965) |
| SkImageFilter::Proxy* proxy() const { return fProxy; } |
| |
| private: |
| const SkIRect fSubset; |
| const uint32_t fUniqueID; |
| |
| // TODO: remove this ASAP (see skbug.com/4965) |
| SkImageFilter::Proxy* fProxy; |
| |
| typedef SkRefCnt INHERITED; |
| }; |
| |
| #endif |
| |