skia2/include/core/SkImageGenerator.h
Mike Reed 7f1d020bbf remove (possibly slow) call to refEncoded in getDeferredTextureImageData
- explicitly reject already-texture-backed and picture-backed

Needed to add a virtual to image_base and generator to distinguish
generators that can (or cannot) natively "generate" on the gpu (e.g. pictures)
Bug: 646089
Change-Id: I3aea22f89b31009ecbb3bd50d88512e6532f0a0f

Change-Id: I3aea22f89b31009ecbb3bd50d88512e6532f0a0f
Reviewed-on: https://skia-review.googlesource.com/15765
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Leon Scroggins <scroggo@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
2017-05-09 03:52:03 +00:00

222 lines
8.1 KiB
C++

/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkImageGenerator_DEFINED
#define SkImageGenerator_DEFINED
#include "SkBitmap.h"
#include "SkColor.h"
#include "SkImage.h"
#include "SkImageInfo.h"
#include "SkYUVSizeInfo.h"
class GrContext;
class GrContextThreadSafeProxy;
class GrTextureProxy;
class GrSamplerParams;
class SkBitmap;
class SkData;
class SkMatrix;
class SkPaint;
class SkPicture;
class SK_API SkImageGenerator : public SkNoncopyable {
public:
/**
* The PixelRef which takes ownership of this SkImageGenerator
* will call the image generator's destructor.
*/
virtual ~SkImageGenerator() { }
uint32_t uniqueID() const { return fUniqueID; }
/**
* Return a ref to the encoded (i.e. compressed) representation
* of this data.
*
* If non-NULL is returned, the caller is responsible for calling
* unref() on the data when it is finished.
*/
SkData* refEncodedData() {
return this->onRefEncodedData();
}
/**
* Return the ImageInfo associated with this generator.
*/
const SkImageInfo& getInfo() const { return fInfo; }
/**
* Can this generator be used to produce images that will be drawable to the specified context
* (or to CPU, if context is nullptr)?
*/
bool isValid(GrContext* context) const {
return this->onIsValid(context);
}
/**
* Decode into the given pixels, a block of memory of size at
* least (info.fHeight - 1) * rowBytes + (info.fWidth *
* bytesPerPixel)
*
* Repeated calls to this function should give the same results,
* allowing the PixelRef to be immutable.
*
* @param info A description of the format (config, size)
* expected by the caller. This can simply be identical
* to the info returned by getInfo().
*
* This contract also allows the caller to specify
* different output-configs, which the implementation can
* decide to support or not.
*
* A size that does not match getInfo() implies a request
* to scale. If the generator cannot perform this scale,
* it will return kInvalidScale.
*
* If info is kIndex8_SkColorType, then the caller must provide storage for up to 256
* SkPMColor values in ctable. On success the generator must copy N colors into that storage,
* (where N is the logical number of table entries) and set ctableCount to N.
*
* If info is not kIndex8_SkColorType, then the last two parameters may be NULL. If ctableCount
* is not null, it will be set to 0.
*
* @return true on success.
*/
bool getPixels(const SkImageInfo& info, void* pixels, size_t rowBytes,
SkPMColor ctable[], int* ctableCount);
/**
* Simplified version of getPixels() that asserts that info is NOT kIndex8_SkColorType and
* uses the default Options.
*/
bool getPixels(const SkImageInfo& info, void* pixels, size_t rowBytes);
/**
* If decoding to YUV is supported, this returns true. Otherwise, this
* returns false and does not modify any of the parameters.
*
* @param sizeInfo Output parameter indicating the sizes and required
* allocation widths of the Y, U, and V planes.
* @param colorSpace Output parameter.
*/
bool queryYUV8(SkYUVSizeInfo* sizeInfo, SkYUVColorSpace* colorSpace) const;
/**
* Returns true on success and false on failure.
* This always attempts to perform a full decode. If the client only
* wants size, it should call queryYUV8().
*
* @param sizeInfo Needs to exactly match the values returned by the
* query, except the WidthBytes may be larger than the
* recommendation (but not smaller).
* @param planes Memory for each of the Y, U, and V planes.
*/
bool getYUV8Planes(const SkYUVSizeInfo& sizeInfo, void* planes[3]);
#if SK_SUPPORT_GPU
/**
* If the generator can natively/efficiently return its pixels as a GPU image (backed by a
* texture) this will return that image. If not, this will return NULL.
*
* This routine also supports retrieving only a subset of the pixels. That subset is specified
* by the following rectangle:
*
* subset = SkIRect::MakeXYWH(origin.x(), origin.y(), info.width(), info.height())
*
* If subset is not contained inside the generator's bounds, this returns false.
*
* whole = SkIRect::MakeWH(getInfo().width(), getInfo().height())
* if (!whole.contains(subset)) {
* return false;
* }
*
* Regarding the GrContext parameter:
*
* It must be non-NULL. The generator should only succeed if:
* - its internal context is the same
* - it can somehow convert its texture into one that is valid for the provided context.
*/
sk_sp<GrTextureProxy> generateTexture(GrContext*, const SkImageInfo& info,
const SkIPoint& origin);
#endif
/**
* If the default image decoder system can interpret the specified (encoded) data, then
* this returns a new ImageGenerator for it. Otherwise this returns NULL. Either way
* the caller is still responsible for managing their ownership of the data.
*/
static std::unique_ptr<SkImageGenerator> MakeFromEncoded(sk_sp<SkData>);
/** Return a new image generator backed by the specified picture. If the size is empty or
* the picture is NULL, this returns NULL.
* The optional matrix and paint arguments are passed to drawPicture() at rasterization
* time.
*/
static std::unique_ptr<SkImageGenerator> MakeFromPicture(const SkISize&, sk_sp<SkPicture>,
const SkMatrix*, const SkPaint*,
SkImage::BitDepth,
sk_sp<SkColorSpace>);
protected:
enum {
kNeedNewImageUniqueID = 0
};
SkImageGenerator(const SkImageInfo& info, uint32_t uniqueId = kNeedNewImageUniqueID);
virtual SkData* onRefEncodedData();
virtual bool onGetPixels(const SkImageInfo& info, void* pixels, size_t rowBytes,
SkPMColor ctable[], int* ctableCount);
virtual bool onIsValid(GrContext*) const;
virtual bool onQueryYUV8(SkYUVSizeInfo*, SkYUVColorSpace*) const {
return false;
}
virtual bool onGetYUV8Planes(const SkYUVSizeInfo&, void*[3] /*planes*/) {
return false;
}
struct Options {
Options()
: fColorTable(nullptr)
, fColorTableCount(nullptr)
, fBehavior(SkTransferFunctionBehavior::kRespect)
{}
SkPMColor* fColorTable;
int* fColorTableCount;
SkTransferFunctionBehavior fBehavior;
};
bool getPixels(const SkImageInfo& info, void* pixels, size_t rowBytes, const Options* opts);
virtual bool onGetPixels(const SkImageInfo& info, void* pixels, size_t rowBytes,
const Options& opts) {
return this->onGetPixels(info, pixels, rowBytes, opts.fColorTable, opts.fColorTableCount);
}
#if SK_SUPPORT_GPU
virtual bool onCanGenerateTexture() const { return false; }
virtual sk_sp<GrTextureProxy> onGenerateTexture(GrContext*, const SkImageInfo&,
const SkIPoint&); // returns nullptr
#endif
private:
const SkImageInfo fInfo;
const uint32_t fUniqueID;
friend class SkImage_Lazy;
// This is our default impl, which may be different on different platforms.
// It is called from NewFromEncoded() after it has checked for any runtime factory.
// The SkData will never be NULL, as that will have been checked by NewFromEncoded.
static std::unique_ptr<SkImageGenerator> MakeFromEncodedImpl(sk_sp<SkData>);
};
#endif // SkImageGenerator_DEFINED