d531ca038f
This fixes SkColorSpaceXformCanvas gms that expect non-linear premuls from the codec. BUG=skia: Change-Id: I5dc236d0cd760c23605a26e9c33ddb18955f9231 Reviewed-on: https://skia-review.googlesource.com/10164 Reviewed-by: Mike Klein <mtklein@chromium.org> Commit-Queue: Matt Sarett <msarett@google.com>
215 lines
8.1 KiB
C++
215 lines
8.1 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 SkImageGenerator_DEFINED
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#define SkImageGenerator_DEFINED
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#include "SkBitmap.h"
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#include "SkColor.h"
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#include "SkImage.h"
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#include "SkImageInfo.h"
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#include "SkYUVSizeInfo.h"
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class GrContext;
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class GrContextThreadSafeProxy;
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class GrTextureProxy;
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class GrSamplerParams;
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class SkBitmap;
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class SkData;
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class SkMatrix;
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class SkPaint;
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class SkPicture;
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class SK_API SkImageGenerator : public SkNoncopyable {
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public:
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/**
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* The PixelRef which takes ownership of this SkImageGenerator
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* will call the image generator's destructor.
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*/
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virtual ~SkImageGenerator() { }
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uint32_t uniqueID() const { return fUniqueID; }
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/**
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* Return a ref to the encoded (i.e. compressed) representation,
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* of this data. If the GrContext is non-null, then the caller is only interested in
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* gpu-specific formats, so the impl may return null even if they have encoded data,
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* assuming they know it is not suitable for the gpu.
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*
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* If non-NULL is returned, the caller is responsible for calling
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* unref() on the data when it is finished.
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*/
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SkData* refEncodedData(GrContext* ctx = nullptr) {
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return this->onRefEncodedData(ctx);
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}
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/**
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* Return the ImageInfo associated with this generator.
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*/
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const SkImageInfo& getInfo() const { return fInfo; }
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/**
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* Decode into the given pixels, a block of memory of size at
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* least (info.fHeight - 1) * rowBytes + (info.fWidth *
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* bytesPerPixel)
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*
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* Repeated calls to this function should give the same results,
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* allowing the PixelRef to be immutable.
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*
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* @param info A description of the format (config, size)
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* expected by the caller. This can simply be identical
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* to the info returned by getInfo().
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*
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* This contract also allows the caller to specify
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* different output-configs, which the implementation can
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* decide to support or not.
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*
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* A size that does not match getInfo() implies a request
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* to scale. If the generator cannot perform this scale,
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* it will return kInvalidScale.
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*
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* If info is kIndex8_SkColorType, then the caller must provide storage for up to 256
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* SkPMColor values in ctable. On success the generator must copy N colors into that storage,
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* (where N is the logical number of table entries) and set ctableCount to N.
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*
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* If info is not kIndex8_SkColorType, then the last two parameters may be NULL. If ctableCount
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* is not null, it will be set to 0.
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*
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* @return true on success.
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*/
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bool getPixels(const SkImageInfo& info, void* pixels, size_t rowBytes,
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SkPMColor ctable[], int* ctableCount);
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/**
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* Simplified version of getPixels() that asserts that info is NOT kIndex8_SkColorType and
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* uses the default Options.
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*/
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bool getPixels(const SkImageInfo& info, void* pixels, size_t rowBytes);
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/**
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* If decoding to YUV is supported, this returns true. Otherwise, this
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* returns false and does not modify any of the parameters.
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*
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* @param sizeInfo Output parameter indicating the sizes and required
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* allocation widths of the Y, U, and V planes.
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* @param colorSpace Output parameter.
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*/
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bool queryYUV8(SkYUVSizeInfo* sizeInfo, SkYUVColorSpace* colorSpace) const;
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/**
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* Returns true on success and false on failure.
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* This always attempts to perform a full decode. If the client only
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* wants size, it should call queryYUV8().
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*
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* @param sizeInfo Needs to exactly match the values returned by the
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* query, except the WidthBytes may be larger than the
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* recommendation (but not smaller).
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* @param planes Memory for each of the Y, U, and V planes.
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*/
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bool getYUV8Planes(const SkYUVSizeInfo& sizeInfo, void* planes[3]);
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#if SK_SUPPORT_GPU
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/**
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* If the generator can natively/efficiently return its pixels as a GPU image (backed by a
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* texture) this will return that image. If not, this will return NULL.
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*
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* This routine also supports retrieving only a subset of the pixels. That subset is specified
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* by the following rectangle:
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*
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* subset = SkIRect::MakeXYWH(origin.x(), origin.y(), info.width(), info.height())
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*
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* If subset is not contained inside the generator's bounds, this returns false.
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*
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* whole = SkIRect::MakeWH(getInfo().width(), getInfo().height())
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* if (!whole.contains(subset)) {
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* return false;
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* }
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*
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* Regarding the GrContext parameter:
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*
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* It must be non-NULL. The generator should only succeed if:
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* - its internal context is the same
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* - it can somehow convert its texture into one that is valid for the provided context.
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*/
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sk_sp<GrTextureProxy> generateTexture(GrContext*, const SkImageInfo& info,
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const SkIPoint& origin);
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#endif
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/**
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* If the default image decoder system can interpret the specified (encoded) data, then
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* this returns a new ImageGenerator for it. Otherwise this returns NULL. Either way
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* the caller is still responsible for managing their ownership of the data.
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*/
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static std::unique_ptr<SkImageGenerator> MakeFromEncoded(sk_sp<SkData>);
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/** Return a new image generator backed by the specified picture. If the size is empty or
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* the picture is NULL, this returns NULL.
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* The optional matrix and paint arguments are passed to drawPicture() at rasterization
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* time.
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*/
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static std::unique_ptr<SkImageGenerator> MakeFromPicture(const SkISize&, sk_sp<SkPicture>,
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const SkMatrix*, const SkPaint*,
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SkImage::BitDepth,
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sk_sp<SkColorSpace>);
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bool tryGenerateBitmap(SkBitmap* bm, const SkImageInfo& info, SkBitmap::Allocator* allocator);
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protected:
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enum {
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kNeedNewImageUniqueID = 0
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};
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SkImageGenerator(const SkImageInfo& info, uint32_t uniqueId = kNeedNewImageUniqueID);
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virtual SkData* onRefEncodedData(GrContext* ctx);
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virtual bool onGetPixels(const SkImageInfo& info, void* pixels, size_t rowBytes,
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SkPMColor ctable[], int* ctableCount);
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virtual bool onQueryYUV8(SkYUVSizeInfo*, SkYUVColorSpace*) const {
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return false;
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}
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virtual bool onGetYUV8Planes(const SkYUVSizeInfo&, void*[3] /*planes*/) {
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return false;
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}
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struct Options {
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Options()
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: fColorTable(nullptr)
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, fColorTableCount(nullptr)
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, fBehavior(SkTransferFunctionBehavior::kRespect)
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{}
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SkPMColor* fColorTable;
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int* fColorTableCount;
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SkTransferFunctionBehavior fBehavior;
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};
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bool getPixels(const SkImageInfo& info, void* pixels, size_t rowBytes, const Options* opts);
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virtual bool onGetPixels(const SkImageInfo& info, void* pixels, size_t rowBytes,
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const Options& opts) {
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return this->onGetPixels(info, pixels, rowBytes, opts.fColorTable, opts.fColorTableCount);
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}
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#if SK_SUPPORT_GPU
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virtual sk_sp<GrTextureProxy> onGenerateTexture(GrContext*, const SkImageInfo&,
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const SkIPoint&);
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#endif
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private:
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const SkImageInfo fInfo;
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const uint32_t fUniqueID;
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friend class SkImageCacherator;
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// This is our default impl, which may be different on different platforms.
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// It is called from NewFromEncoded() after it has checked for any runtime factory.
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// The SkData will never be NULL, as that will have been checked by NewFromEncoded.
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static std::unique_ptr<SkImageGenerator> MakeFromEncodedImpl(sk_sp<SkData>);
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};
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#endif // SkImageGenerator_DEFINED
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