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* 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 SurfaceContext_DEFINED
#define SurfaceContext_DEFINED
#include "include/core/SkImage.h"
#include "include/core/SkRect.h"
#include "include/core/SkRefCnt.h"
#include "include/core/SkSamplingOptions.h"
#include "include/core/SkSurface.h"
#include "src/gpu/GrColorInfo.h"
#include "src/gpu/GrDataUtils.h"
#include "src/gpu/GrImageInfo.h"
#include "src/gpu/GrPixmap.h"
#include "src/gpu/GrRenderTask.h"
#include "src/gpu/GrSurfaceProxy.h"
#include "src/gpu/GrSurfaceProxyView.h"
class GrDrawingManager;
class GrRecordingContext;
class GrRenderTargetProxy;
class GrSingleOwner;
class GrSurface;
class GrSurfaceProxy;
class GrTextureProxy;
struct SkIPoint;
struct SkIRect;
namespace skgpu {
class SurfaceFillContext;
* A helper object to orchestrate commands for a particular surface
* SurfaceContext
* |
* SurfaceFillContext
* / \
* v1::SFC v2::SFC
* | |
* | |
* | |
* v1::SDC v2::SDC
class SurfaceContext {
// If it is known that the GrSurfaceProxy is not renderable, you can directly call the ctor
// here to make a SurfaceContext on the stack.
SurfaceContext(GrRecordingContext*, GrSurfaceProxyView readView, const GrColorInfo&);
virtual ~SurfaceContext() = default;
GrRecordingContext* recordingContext() const { return fContext; }
const GrColorInfo& colorInfo() const { return fColorInfo; }
GrImageInfo imageInfo() const { return {fColorInfo, fReadView.proxy()->dimensions()}; }
GrSurfaceOrigin origin() const { return fReadView.origin(); }
GrSwizzle readSwizzle() const { return fReadView.swizzle(); }
// TODO: See if it makes sense for this to return a const& instead and require the callers to
// make a copy (which refs the proxy) if needed.
GrSurfaceProxyView readSurfaceView() { return fReadView; }
SkISize dimensions() const { return fReadView.dimensions(); }
int width() const { return fReadView.proxy()->width(); }
int height() const { return fReadView.proxy()->height(); }
GrMipmapped mipmapped() const { return fReadView.mipmapped(); }
const GrCaps* caps() const;
* Reads a rectangle of pixels from the surface context.
* @param dContext The direct context to use
* @param dst destination pixels for the read
* @param srcPt offset w/in the surface context from which to read
* is a GrDirectContext and fail otherwise.
bool readPixels(GrDirectContext* dContext, GrPixmap dst, SkIPoint srcPt);
using ReadPixelsCallback = SkImage::ReadPixelsCallback;
using ReadPixelsContext = SkImage::ReadPixelsContext;
using RescaleGamma = SkImage::RescaleGamma;
using RescaleMode = SkImage::RescaleMode;
// GPU implementation for SkImage:: and SkSurface::asyncRescaleAndReadPixels.
void asyncRescaleAndReadPixels(GrDirectContext*,
const SkImageInfo& info,
const SkIRect& srcRect,
RescaleGamma rescaleGamma,
ReadPixelsCallback callback,
ReadPixelsContext callbackContext);
// GPU implementation for SkImage:: and SkSurface::asyncRescaleAndReadPixelsYUV420.
void asyncRescaleAndReadPixelsYUV420(GrDirectContext*,
SkYUVColorSpace yuvColorSpace,
sk_sp<SkColorSpace> dstColorSpace,
const SkIRect& srcRect,
SkISize dstSize,
RescaleGamma rescaleGamma,
ReadPixelsCallback callback,
ReadPixelsContext context);
* Writes a rectangle of pixels from src into the surfaceDrawContext at the specified position.
* @param dContext The direct context to use
* @param src source for the write
* @param dstPt offset w/in the surface context at which to write
bool writePixels(GrDirectContext* dContext,
GrCPixmap src,
SkIPoint dstPt);
* Fully populates either the base level or all MIP levels of the GrSurface with pixel data.
* @param dContext The direct context to use
* @param src Array of pixmaps
* @param numLevels Number of pixmaps in src. To succeed this must be 1 or the total
* number of MIP levels.
bool writePixels(GrDirectContext* dContext,
const GrCPixmap src[],
int numLevels);
GrSurfaceProxy* asSurfaceProxy() { return fReadView.proxy(); }
const GrSurfaceProxy* asSurfaceProxy() const { return fReadView.proxy(); }
sk_sp<GrSurfaceProxy> asSurfaceProxyRef() { return fReadView.refProxy(); }
GrTextureProxy* asTextureProxy() { return fReadView.asTextureProxy(); }
const GrTextureProxy* asTextureProxy() const { return fReadView.asTextureProxy(); }
sk_sp<GrTextureProxy> asTextureProxyRef() { return fReadView.asTextureProxyRef(); }
GrRenderTargetProxy* asRenderTargetProxy() { return fReadView.asRenderTargetProxy(); }
const GrRenderTargetProxy* asRenderTargetProxy() const {
return fReadView.asRenderTargetProxy();
sk_sp<GrRenderTargetProxy> asRenderTargetProxyRef() {
return fReadView.asRenderTargetProxyRef();
virtual SurfaceFillContext* asFillContext() { return nullptr; }
* Rescales the contents of srcRect. The gamma in which the rescaling occurs is controlled by
* RescaleGamma. It is always in the original gamut. The result is converted to the color type
* and color space of info after rescaling. Note: this currently requires that the info have a
* different size than srcRect. Though, it could be relaxed to allow non-scaling color
* conversions.
std::unique_ptr<skgpu::SurfaceFillContext> rescale(const GrImageInfo& info,
SkIRect srcRect,
* Like the above but allows the caller ot specify a destination fill context and
* rect within that context. The dst rect must be contained by the dst or this will fail.
bool rescaleInto(SurfaceFillContext* dst,
SkIRect dstRect,
SkIRect srcRect,
bool testCopy(sk_sp<GrSurfaceProxy> src, const SkIRect& srcRect, const SkIPoint& dstPoint) {
return this->copy(std::move(src), srcRect, dstPoint) != nullptr;
bool testCopy(sk_sp<GrSurfaceProxy> src) {
auto rect = SkIRect::MakeSize(src->dimensions());
return this->copy(std::move(src), rect, {0, 0}) != nullptr;
GrDrawingManager* drawingManager();
const GrDrawingManager* drawingManager() const;
SkDEBUGCODE(void validate() const;)
SkDEBUGCODE(GrSingleOwner* singleOwner() const;)
GrRecordingContext* fContext;
GrSurfaceProxyView fReadView;
// Inserts a transfer, part of the implementation of asyncReadPixels and
// asyncRescaleAndReadPixelsYUV420().
struct PixelTransferResult {
using ConversionFn = void(void* dst, const void* mappedBuffer);
// If null then the transfer could not be performed. Otherwise this buffer will contain
// the pixel data when the transfer is complete.
sk_sp<GrGpuBuffer> fTransferBuffer;
// If this is null then the transfer buffer will contain the data in the requested
// color type. Otherwise, when the transfer is done this must be called to convert
// from the transfer buffer's color type to the requested color type.
std::function<ConversionFn> fPixelConverter;
PixelTransferResult transferPixels(GrColorType colorType, const SkIRect& rect);
// The async read step of asyncRescaleAndReadPixels()
void asyncReadPixels(GrDirectContext*,
const SkIRect& srcRect,
friend class ::GrRecordingContextPriv; // for validate
friend class ::GrSurfaceProxy; // for copy
SkDEBUGCODE(virtual void onValidate() const {})
* Copy 'src' into the proxy backing this context. This call will not do any draw fallback.
* Currently only writePixels and replaceRenderTarget call this directly. All other copies
* should go through GrSurfaceProxy::Copy.
* @param src src of pixels
* @param dstPoint the origin of the 'srcRect' in the destination coordinate space
* @return a task (that may be skippable by calling canSkip) if successful and
* null otherwise.
* Note: Notionally, 'srcRect' is clipped to 'src's extent with 'dstPoint' being adjusted.
* Then the 'srcRect' offset by 'dstPoint' is clipped against the dst's extent.
* The end result is only valid src pixels and dst pixels will be touched but the copied
* regions will not be shifted. The 'src' must have the same origin as the backing proxy
* of fSurfaceContext.
sk_sp<GrRenderTask> copy(sk_sp<GrSurfaceProxy> src, SkIRect srcRect, SkIPoint dstPoint);
bool internalWritePixels(GrDirectContext* dContext,
const GrCPixmap src[],
int numLevels,
class AsyncReadResult;
GrColorInfo fColorInfo;
using INHERITED = SkRefCnt;
} // namespace skgpu
#endif // SurfaceContext_DEFINED