58cda8fa49
R=reed@google.com BUG=skia:5806 GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=5134 Change-Id: Ib0215f63b67f4d5b619ebe1f1b70c7d95e604871 Reviewed-on: https://skia-review.googlesource.com/5134 Reviewed-by: Mike Reed <reed@google.com> Commit-Queue: Florin Malita <fmalita@chromium.org>
321 lines
12 KiB
C++
321 lines
12 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 "SkImageInfo.h"
|
|
#include "SkYUVSizeInfo.h"
|
|
|
|
class GrContext;
|
|
class GrContextThreadSafeProxy;
|
|
class GrTexture;
|
|
class GrSamplerParams;
|
|
class SkBitmap;
|
|
class SkData;
|
|
class SkImage;
|
|
class SkImageGenerator;
|
|
class SkMatrix;
|
|
class SkPaint;
|
|
class SkPicture;
|
|
|
|
#ifdef SK_SUPPORT_LEGACY_REFENCODEDDATA_NOCTX
|
|
#define SK_REFENCODEDDATA_CTXPARAM
|
|
#else
|
|
#define SK_REFENCODEDDATA_CTXPARAM GrContext* ctx
|
|
#endif
|
|
|
|
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 the GrContext is non-null, then the caller is only interested in
|
|
* gpu-specific formats, so the impl may return null even if they have encoded data,
|
|
* assuming they know it is not suitable for the gpu.
|
|
*
|
|
* If non-NULL is returned, the caller is responsible for calling
|
|
* unref() on the data when it is finished.
|
|
*/
|
|
SkData* refEncodedData(GrContext* ctx = nullptr) {
|
|
#ifdef SK_SUPPORT_LEGACY_REFENCODEDDATA_NOCTX
|
|
return this->onRefEncodedData();
|
|
#else
|
|
return this->onRefEncodedData(ctx);
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* Return the ImageInfo associated with this generator.
|
|
*/
|
|
const SkImageInfo& getInfo() const { return fInfo; }
|
|
|
|
/**
|
|
* 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]);
|
|
|
|
/**
|
|
* Returns true if the generate can efficiently return a texture (given the properties of the
|
|
* proxy). By default, simple codecs will usually return false, since they must be decoded
|
|
* on the CPU and then uploaded to become a texture.
|
|
*/
|
|
bool canGenerateTexture(const GrContextThreadSafeProxy& proxy) {
|
|
return this->onCanGenerateTexture(proxy);
|
|
}
|
|
|
|
/**
|
|
* 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.
|
|
*
|
|
* Regarding the GrContext parameter:
|
|
*
|
|
* The caller may pass NULL for the context. In that case the generator may assume that its
|
|
* internal context is current. If it has no internal context, then it should just return
|
|
* null.
|
|
*
|
|
* If the caller passes a non-null context, then the generator should only succeed if:
|
|
* - it has no intrinsic context, and will use the caller's
|
|
* - its internal context is the same
|
|
* - it can somehow convert its texture into one that is valid for the provided context.
|
|
*/
|
|
GrTexture* generateTexture(GrContext*, const SkIRect* subset = nullptr);
|
|
|
|
struct SupportedSizes {
|
|
SkISize fSizes[2];
|
|
};
|
|
|
|
/**
|
|
* Some generators can efficiently scale their contents. If this is supported, the generator
|
|
* may only support certain scaled dimensions. Call this with the desired scale factor,
|
|
* and it will return true if scaling is supported, and in supportedSizes[] it will return
|
|
* the nearest supported dimensions.
|
|
*
|
|
* If no native scaling is supported, or scale is invalid (e.g. scale <= 0 || scale > 1)
|
|
* this will return false, and the supportedsizes will be undefined.
|
|
*/
|
|
bool computeScaledDimensions(SkScalar scale, SupportedSizes*);
|
|
|
|
/**
|
|
* Scale the generator's pixels to fit into scaledSize.
|
|
* This routine also support retrieving only a subset of the pixels. That subset is specified
|
|
* by the following rectangle (in the scaled space):
|
|
*
|
|
* subset = SkIRect::MakeXYWH(subsetOrigin.x(), subsetOrigin.y(),
|
|
* subsetPixels.width(), subsetPixels.height())
|
|
*
|
|
* If subset is not contained inside the scaledSize, this returns false.
|
|
*
|
|
* whole = SkIRect::MakeWH(scaledSize.width(), scaledSize.height())
|
|
* if (!whole.contains(subset)) {
|
|
* return false;
|
|
* }
|
|
*
|
|
* If the requested colortype/alphatype in pixels is not supported,
|
|
* or the requested scaledSize is not supported, or the generator encounters an error,
|
|
* this returns false.
|
|
*/
|
|
bool generateScaledPixels(const SkISize& scaledSize, const SkIPoint& subsetOrigin,
|
|
const SkPixmap& subsetPixels);
|
|
|
|
bool generateScaledPixels(const SkPixmap& scaledPixels) {
|
|
return this->generateScaledPixels(SkISize::Make(scaledPixels.width(),
|
|
scaledPixels.height()),
|
|
SkIPoint::Make(0, 0), scaledPixels);
|
|
}
|
|
|
|
/**
|
|
* External generator API: provides efficient access to externally-managed image data.
|
|
*
|
|
* Skia calls accessScaledPixels() during rasterization, to gain temporary access to
|
|
* the external pixel data. When done, the provided callback is invoked to release the
|
|
* associated resources.
|
|
*
|
|
* @param srcRect the source rect in use for the current draw
|
|
* @param totalMatrix full matrix in effect (mapping srcRect -> device space)
|
|
* @param quality the SkFilterQuality requested for rasterization.
|
|
* @param rec out param, expected to be set when the call succeeds:
|
|
*
|
|
* - fPixmap external pixel data
|
|
* - fSrcRect is an adjusted srcRect
|
|
* - fQuality is the adjusted filter quality
|
|
* - fReleaseProc pixmap release callback, same signature as the
|
|
* SkBitmap::installPixels() callback
|
|
* - fReleaseCtx opaque release context argument
|
|
*
|
|
* @return true on success, false otherwise (error or if this API is not supported;
|
|
* in this case Skia will fall back to its internal scaling and caching
|
|
* heuristics)
|
|
*
|
|
* Implementors can return pixmaps with a different size than requested, by adjusting the
|
|
* src rect. The contract is that Skia will observe the adjusted src rect, and will map it
|
|
* to the same dest as the original draw (the impl doesn't get to control the destination).
|
|
*
|
|
*/
|
|
|
|
struct ScaledImageRec {
|
|
SkPixmap fPixmap;
|
|
SkRect fSrcRect;
|
|
SkFilterQuality fQuality;
|
|
|
|
using ReleaseProcT = void (*)(void* pixels, void* releaseCtx);
|
|
|
|
ReleaseProcT fReleaseProc;
|
|
void* fReleaseCtx;
|
|
};
|
|
|
|
bool accessScaledImage(const SkRect& srcRect, const SkMatrix& totalMatrix,
|
|
SkFilterQuality quality, ScaledImageRec* rec);
|
|
|
|
/**
|
|
* 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 SkImageGenerator* NewFromEncoded(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 SkImageGenerator* NewFromPicture(const SkISize&, const SkPicture*, const SkMatrix*,
|
|
const SkPaint*);
|
|
|
|
bool tryGenerateBitmap(SkBitmap* bm) {
|
|
return this->tryGenerateBitmap(bm, nullptr, nullptr);
|
|
}
|
|
bool tryGenerateBitmap(SkBitmap* bm, const SkImageInfo& info, SkBitmap::Allocator* allocator) {
|
|
return this->tryGenerateBitmap(bm, &info, allocator);
|
|
}
|
|
void generateBitmap(SkBitmap* bm) {
|
|
if (!this->tryGenerateBitmap(bm, nullptr, nullptr)) {
|
|
sk_throw();
|
|
}
|
|
}
|
|
void generateBitmap(SkBitmap* bm, const SkImageInfo& info) {
|
|
if (!this->tryGenerateBitmap(bm, &info, nullptr)) {
|
|
sk_throw();
|
|
}
|
|
}
|
|
|
|
protected:
|
|
enum {
|
|
kNeedNewImageUniqueID = 0
|
|
};
|
|
|
|
SkImageGenerator(const SkImageInfo& info, uint32_t uniqueId = kNeedNewImageUniqueID);
|
|
|
|
virtual SkData* onRefEncodedData(SK_REFENCODEDDATA_CTXPARAM);
|
|
|
|
virtual bool onGetPixels(const SkImageInfo& info, void* pixels, size_t rowBytes,
|
|
SkPMColor ctable[], int* ctableCount);
|
|
|
|
virtual bool onQueryYUV8(SkYUVSizeInfo*, SkYUVColorSpace*) const {
|
|
return false;
|
|
}
|
|
virtual bool onGetYUV8Planes(const SkYUVSizeInfo&, void*[3] /*planes*/) {
|
|
return false;
|
|
}
|
|
|
|
virtual bool onCanGenerateTexture(const GrContextThreadSafeProxy&) {
|
|
return false;
|
|
}
|
|
virtual GrTexture* onGenerateTexture(GrContext*, const SkIRect*) {
|
|
return nullptr;
|
|
}
|
|
|
|
virtual bool onComputeScaledDimensions(SkScalar, SupportedSizes*) {
|
|
return false;
|
|
}
|
|
virtual bool onGenerateScaledPixels(const SkISize&, const SkIPoint&, const SkPixmap&) {
|
|
return false;
|
|
}
|
|
|
|
virtual bool onAccessScaledImage(const SkRect&, const SkMatrix&, SkFilterQuality,
|
|
ScaledImageRec*) {
|
|
return false;
|
|
}
|
|
|
|
bool tryGenerateBitmap(SkBitmap* bm, const SkImageInfo* optionalInfo, SkBitmap::Allocator*);
|
|
|
|
private:
|
|
const SkImageInfo fInfo;
|
|
const uint32_t fUniqueID;
|
|
|
|
// 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 SkImageGenerator* NewFromEncodedImpl(SkData*);
|
|
};
|
|
|
|
#endif // SkImageGenerator_DEFINED
|