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/*
* Copyright 2023 Google LLC
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "src/gpu/ganesh/image/SkSpecialImage_Ganesh.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkColorSpace.h" // IWYU pragma: keep
#include "include/core/SkImage.h"
#include "include/core/SkImageInfo.h"
#include "include/core/SkMatrix.h"
#include "include/core/SkRect.h"
#include "include/core/SkScalar.h"
#include "include/gpu/GpuTypes.h"
#include "include/gpu/GrRecordingContext.h"
#include "include/private/base/SkAssert.h"
#include "include/private/base/SkPoint_impl.h"
#include "include/private/gpu/ganesh/GrImageContext.h"
#include "include/private/gpu/ganesh/GrTypesPriv.h"
#include "src/core/SkSpecialImage.h"
#include "src/gpu/SkBackingFit.h"
#include "src/gpu/ganesh/GrSurfaceProxy.h"
#include "src/gpu/ganesh/GrSurfaceProxyPriv.h"
#include "src/gpu/ganesh/GrSurfaceProxyView.h"
#include "src/gpu/ganesh/image/GrImageUtils.h"
#include "src/gpu/ganesh/image/SkImage_Ganesh.h"
#include "src/image/SkImage_Base.h"
#include "src/shaders/SkImageShader.h"
#include <cstddef>
#include <utility>
class SkPaint;
class SkShader;
struct SkSamplingOptions;
enum SkColorType : int;
enum class SkTileMode;
static sk_sp<SkImage> wrap_proxy_in_image(GrRecordingContext* context,
GrSurfaceProxyView view,
const SkColorInfo& colorInfo) {
return sk_make_sp<SkImage_Ganesh>(
sk_ref_sp(context), kNeedNewImageUniqueID, std::move(view), colorInfo);
}
class SkSpecialImage_Gpu final : public SkSpecialImage {
public:
SkSpecialImage_Gpu(GrRecordingContext* context,
const SkIRect& subset,
uint32_t uniqueID,
GrSurfaceProxyView view,
const SkColorInfo& colorInfo,
const SkSurfaceProps& props)
: SkSpecialImage(subset, uniqueID, colorInfo, props)
, fContext(context)
, fView(std::move(view)) {}
size_t getSize() const override { return fView.proxy()->gpuMemorySize(); }
bool isGaneshBacked() const override { return true; }
void onDraw(SkCanvas* canvas,
SkScalar x,
SkScalar y,
const SkSamplingOptions& sampling,
const SkPaint* paint) const override {
SkRect dst = SkRect::MakeXYWH(x, y, this->subset().width(), this->subset().height());
// TODO: In this instance we know we're going to draw a sub-portion of the backing
// texture into the canvas so it is okay to wrap it in an SkImage. This poses
// some problems for full deferral however in that when the deferred SkImage_Ganesh
// instantiates itself it is going to have to either be okay with having a larger
// than expected backing texture (unlikely) or the 'fit' of the SurfaceProxy needs
// to be tightened (if it is deferred).
sk_sp<SkImage> img = sk_sp<SkImage>(new SkImage_Ganesh(
sk_ref_sp(canvas->recordingContext()), this->uniqueID(), fView, this->colorInfo()));
canvas->drawImageRect(img,
SkRect::Make(this->subset()),
dst,
sampling,
paint,
SkCanvas::kStrict_SrcRectConstraint);
}
GrRecordingContext* getContext() const override { return fContext; }
GrSurfaceProxyView view(GrRecordingContext*) const { return fView; }
sk_sp<SkSpecialImage> onMakeSubset(const SkIRect& subset) const override {
return SkSpecialImages::MakeDeferredFromGpu(
fContext, subset, this->uniqueID(), fView, this->colorInfo(), this->props());
}
sk_sp<SkImage> onAsImage(const SkIRect* subset) const override {
GrSurfaceProxy* proxy = fView.proxy();
if (subset) {
if (proxy->isFunctionallyExact() && *subset == SkIRect::MakeSize(proxy->dimensions())) {
proxy->priv().exactify(false);
// The existing GrTexture is already tight so reuse it in the SkImage
return wrap_proxy_in_image(fContext, fView, this->colorInfo());
}
auto subsetView = GrSurfaceProxyView::Copy(fContext,
fView,
skgpu::Mipmapped::kNo,
*subset,
SkBackingFit::kExact,
skgpu::Budgeted::kYes,
/*label=*/"SkSpecialImage_AsImage");
if (!subsetView) {
return nullptr;
}
SkASSERT(subsetView.asTextureProxy());
SkASSERT(subsetView.proxy()->priv().isExact());
// MDB: this is acceptable (wrapping subsetProxy in an SkImage) bc Copy will
// return a kExact-backed proxy
return wrap_proxy_in_image(fContext, std::move(subsetView), this->colorInfo());
}
proxy->priv().exactify(true);
return wrap_proxy_in_image(fContext, fView, this->colorInfo());
}
sk_sp<SkShader> onAsShader(SkTileMode tileMode,
const SkSamplingOptions& sampling,
const SkMatrix& lm) const override {
// The special image's logical (0,0) is at its subset's topLeft() so we need to account for
// that in the local matrix used when sampling.
SkMatrix subsetOrigin = SkMatrix::Translate(-this->subset().topLeft());
subsetOrigin.postConcat(lm);
// However, we don't need to modify the subset itself since that is defined with respect to
// the base image, and the local matrix is applied before any tiling/clamping.
const SkRect subset = SkRect::Make(this->subset());
// asImage() w/o a subset makes no copy; create the SkImageShader directly to remember the
// subset used to access the image.
return SkImageShader::MakeSubset(
this->asImage(), subset, tileMode, tileMode, sampling, &subsetOrigin);
}
private:
GrRecordingContext* fContext;
GrSurfaceProxyView fView;
};
namespace SkSpecialImages {
sk_sp<SkSpecialImage> MakeFromTextureImage(GrRecordingContext* rContext,
const SkIRect& subset,
sk_sp<SkImage> image,
const SkSurfaceProps& props) {
if (!rContext || !image || subset.isEmpty()) {
return nullptr;
}
SkASSERT(image->bounds().contains(subset));
// This will work even if the image is a raster-backed image.
auto [view, ct] = skgpu::ganesh::AsView(rContext, image, skgpu::Mipmapped::kNo);
return MakeDeferredFromGpu(rContext,
subset,
image->uniqueID(),
std::move(view),
{ct, image->alphaType(), image->refColorSpace()},
props);
}
sk_sp<SkSpecialImage> MakeDeferredFromGpu(GrRecordingContext* context,
const SkIRect& subset,
uint32_t uniqueID,
GrSurfaceProxyView view,
const GrColorInfo& colorInfo,
const SkSurfaceProps& props) {
if (!context || context->abandoned() || !view.asTextureProxy()) {
return nullptr;
}
SkASSERT(view.proxy()->backingStoreBoundsIRect().contains(subset));
SkColorType ct = GrColorTypeToSkColorType(colorInfo.colorType());
return sk_make_sp<SkSpecialImage_Gpu>(
context,
subset,
uniqueID,
std::move(view),
SkColorInfo(ct, colorInfo.alphaType(), colorInfo.refColorSpace()),
props);
}
GrSurfaceProxyView AsView(GrRecordingContext* context, const SkSpecialImage* img) {
if (!context || !img || !img->isGaneshBacked()) {
return {};
}
auto grImg = static_cast<const SkSpecialImage_Gpu*>(img);
return grImg->view(context);
}
} // namespace SkSpecialImages
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