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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
*/
#include "SkSpecialImage.h"
#include "SkBitmap.h"
#include "SkImage.h"
#include "SkBitmapCache.h"
#include "SkCanvas.h"
#include "SkImage_Base.h"
#include "SkSpecialSurface.h"
#include "SkSurfacePriv.h"
#include "SkPixelRef.h"
#if SK_SUPPORT_GPU
#include "GrContext.h"
#include "GrContextPriv.h"
#include "GrResourceProvider.h"
#include "GrSurfaceContext.h"
#include "GrTextureProxy.h"
#include "SkImage_Gpu.h"
#endif
// Currently the raster imagefilters can only handle certain imageinfos. Call this to know if
// a given info is supported.
static bool valid_for_imagefilters(const SkImageInfo& info) {
// no support for other swizzles/depths yet
return info.colorType() == kN32_SkColorType;
}
///////////////////////////////////////////////////////////////////////////////
class SkSpecialImage_Base : public SkSpecialImage {
public:
SkSpecialImage_Base(const SkIRect& subset, uint32_t uniqueID, const SkSurfaceProps* props)
: INHERITED(subset, uniqueID, props) {
}
~SkSpecialImage_Base() override { }
virtual void onDraw(SkCanvas*, SkScalar x, SkScalar y, const SkPaint*) const = 0;
virtual bool onGetROPixels(SkBitmap*) const = 0;
virtual GrContext* onGetContext() const { return nullptr; }
virtual SkColorSpace* onGetColorSpace() const = 0;
#if SK_SUPPORT_GPU
virtual sk_sp<GrTextureProxy> onAsTextureProxyRef(GrContext* context) const = 0;
#endif
virtual sk_sp<SkSpecialImage> onMakeSubset(const SkIRect& subset) const = 0;
virtual sk_sp<SkSpecialSurface> onMakeSurface(const SkImageFilter::OutputProperties& outProps,
const SkISize& size, SkAlphaType at) const = 0;
virtual sk_sp<SkImage> onAsImage(const SkIRect* subset) const = 0;
virtual sk_sp<SkSurface> onMakeTightSurface(const SkImageFilter::OutputProperties& outProps,
const SkISize& size, SkAlphaType at) const = 0;
private:
typedef SkSpecialImage INHERITED;
};
///////////////////////////////////////////////////////////////////////////////
static inline const SkSpecialImage_Base* as_SIB(const SkSpecialImage* image) {
return static_cast<const SkSpecialImage_Base*>(image);
}
SkSpecialImage::SkSpecialImage(const SkIRect& subset,
uint32_t uniqueID,
const SkSurfaceProps* props)
: fProps(SkSurfacePropsCopyOrDefault(props))
, fSubset(subset)
, fUniqueID(kNeedNewImageUniqueID_SpecialImage == uniqueID ? SkNextID::ImageID() : uniqueID) {
}
sk_sp<SkSpecialImage> SkSpecialImage::makeTextureImage(GrContext* context) {
#if SK_SUPPORT_GPU
if (!context) {
return nullptr;
}
if (GrContext* curContext = as_SIB(this)->onGetContext()) {
return curContext == context ? sk_sp<SkSpecialImage>(SkRef(this)) : nullptr;
}
SkBitmap bmp;
// At this point, we are definitely not texture-backed, so we must be raster or generator
// backed. If we remove the special-wrapping-an-image subclass, we may be able to assert that
// we are strictly raster-backed (i.e. generator images become raster when they are specialized)
// in which case getROPixels could turn into peekPixels...
if (!this->getROPixels(&bmp)) {
return nullptr;
}
if (bmp.empty()) {
return SkSpecialImage::MakeFromRaster(SkIRect::MakeEmpty(), bmp, &this->props());
}
// TODO: this is a tight copy of 'bmp' but it doesn't have to be (given SkSpecialImage's
// semantics). Since this is cached though we would have to bake the fit into the cache key.
sk_sp<GrTextureProxy> proxy = GrMakeCachedBitmapProxy(context->resourceProvider(), bmp);
if (!proxy) {
return nullptr;
}
const SkIRect rect = SkIRect::MakeWH(proxy->width(), proxy->height());
// GrMakeCachedBitmapProxy has uploaded only the specified subset of 'bmp' so we need not
// bother with SkBitmap::getSubset
return SkSpecialImage::MakeDeferredFromGpu(context,
rect,
this->uniqueID(),
std::move(proxy),
sk_ref_sp(this->getColorSpace()),
&this->props(),
this->alphaType());
#else
return nullptr;
#endif
}
void SkSpecialImage::draw(SkCanvas* canvas, SkScalar x, SkScalar y, const SkPaint* paint) const {
return as_SIB(this)->onDraw(canvas, x, y, paint);
}
bool SkSpecialImage::getROPixels(SkBitmap* bm) const {
return as_SIB(this)->onGetROPixels(bm);
}
bool SkSpecialImage::isTextureBacked() const {
return SkToBool(as_SIB(this)->onGetContext());
}
GrContext* SkSpecialImage::getContext() const {
return as_SIB(this)->onGetContext();
}
SkColorSpace* SkSpecialImage::getColorSpace() const {
return as_SIB(this)->onGetColorSpace();
}
#if SK_SUPPORT_GPU
sk_sp<GrTextureProxy> SkSpecialImage::asTextureProxyRef(GrContext* context) const {
return as_SIB(this)->onAsTextureProxyRef(context);
}
#endif
sk_sp<SkSpecialSurface> SkSpecialImage::makeSurface(const SkImageFilter::OutputProperties& outProps,
const SkISize& size, SkAlphaType at) const {
return as_SIB(this)->onMakeSurface(outProps, size, at);
}
sk_sp<SkSurface> SkSpecialImage::makeTightSurface(const SkImageFilter::OutputProperties& outProps,
const SkISize& size, SkAlphaType at) const {
return as_SIB(this)->onMakeTightSurface(outProps, size, at);
}
sk_sp<SkSpecialImage> SkSpecialImage::makeSubset(const SkIRect& subset) const {
return as_SIB(this)->onMakeSubset(subset);
}
sk_sp<SkImage> SkSpecialImage::asImage(const SkIRect* subset) const {
return as_SIB(this)->onAsImage(subset);
}
#ifdef SK_DEBUG
static bool rect_fits(const SkIRect& rect, int width, int height) {
if (0 == width && 0 == height) {
SkASSERT(0 == rect.fLeft && 0 == rect.fRight && 0 == rect.fTop && 0 == rect.fBottom);
return true;
}
return rect.fLeft >= 0 && rect.fLeft < width && rect.fLeft < rect.fRight &&
rect.fRight >= 0 && rect.fRight <= width &&
rect.fTop >= 0 && rect.fTop < height && rect.fTop < rect.fBottom &&
rect.fBottom >= 0 && rect.fBottom <= height;
}
#endif
sk_sp<SkSpecialImage> SkSpecialImage::MakeFromImage(const SkIRect& subset,
sk_sp<SkImage> image,
SkColorSpace* dstColorSpace,
const SkSurfaceProps* props) {
SkASSERT(rect_fits(subset, image->width(), image->height()));
#if SK_SUPPORT_GPU
if (sk_sp<GrTextureProxy> proxy = as_IB(image)->asTextureProxyRef()) {
GrContext* context = ((SkImage_Gpu*) as_IB(image))->context();
return MakeDeferredFromGpu(context, subset, image->uniqueID(), std::move(proxy),
as_IB(image)->onImageInfo().refColorSpace(), props);
} else
#endif
{
SkBitmap bm;
if (as_IB(image)->getROPixels(&bm, dstColorSpace)) {
return MakeFromRaster(subset, bm, props);
}
}
return nullptr;
}
///////////////////////////////////////////////////////////////////////////////
class SkSpecialImage_Raster : public SkSpecialImage_Base {
public:
SkSpecialImage_Raster(const SkIRect& subset, const SkBitmap& bm, const SkSurfaceProps* props)
: INHERITED(subset, bm.getGenerationID(), props)
, fBitmap(bm)
{
SkASSERT(bm.pixelRef());
SkASSERT(fBitmap.getPixels());
}
SkAlphaType alphaType() const override { return fBitmap.alphaType(); }
size_t getSize() const override { return fBitmap.getSize(); }
void onDraw(SkCanvas* canvas, SkScalar x, SkScalar y, const SkPaint* paint) const override {
SkRect dst = SkRect::MakeXYWH(x, y,
this->subset().width(), this->subset().height());
canvas->drawBitmapRect(fBitmap, this->subset(),
dst, paint, SkCanvas::kStrict_SrcRectConstraint);
}
bool onGetROPixels(SkBitmap* bm) const override {
*bm = fBitmap;
return true;
}
SkColorSpace* onGetColorSpace() const override {
return fBitmap.colorSpace();
}
#if SK_SUPPORT_GPU
sk_sp<GrTextureProxy> onAsTextureProxyRef(GrContext* context) const override {
if (context) {
return GrMakeCachedBitmapProxy(context->resourceProvider(), fBitmap);
}
return nullptr;
}
#endif
// TODO: The raster implementations of image filters all currently assume that the pixels are
// legacy N32. Until they actually check the format and operate on sRGB or F16 data appropriately,
// we can't enable this. (They will continue to produce incorrect results, but less-so).
#define RASTER_IMAGE_FILTERS_SUPPORT_SRGB_AND_F16 0
sk_sp<SkSpecialSurface> onMakeSurface(const SkImageFilter::OutputProperties& outProps,
const SkISize& size, SkAlphaType at) const override {
#if RASTER_IMAGE_FILTERS_SUPPORT_SRGB_AND_F16
SkColorSpace* colorSpace = outProps.colorSpace();
#else
SkColorSpace* colorSpace = nullptr;
#endif
SkColorType colorType = colorSpace && colorSpace->gammaIsLinear()
? kRGBA_F16_SkColorType : kN32_SkColorType;
SkImageInfo info = SkImageInfo::Make(size.width(), size.height(), colorType, at,
sk_ref_sp(colorSpace));
return SkSpecialSurface::MakeRaster(info, nullptr);
}
sk_sp<SkSpecialImage> onMakeSubset(const SkIRect& subset) const override {
SkBitmap subsetBM;
if (!fBitmap.extractSubset(&subsetBM, subset)) {
return nullptr;
}
return SkSpecialImage::MakeFromRaster(SkIRect::MakeWH(subset.width(), subset.height()),
subsetBM,
&this->props());
}
sk_sp<SkImage> onAsImage(const SkIRect* subset) const override {
if (subset) {
SkBitmap subsetBM;
if (!fBitmap.extractSubset(&subsetBM, *subset)) {
return nullptr;
}
return SkImage::MakeFromBitmap(subsetBM);
}
return SkImage::MakeFromBitmap(fBitmap);
}
sk_sp<SkSurface> onMakeTightSurface(const SkImageFilter::OutputProperties& outProps,
const SkISize& size, SkAlphaType at) const override {
#if RASTER_IMAGE_FILTERS_SUPPORT_SRGB_AND_F16
SkColorSpace* colorSpace = outProps.colorSpace();
#else
SkColorSpace* colorSpace = nullptr;
#endif
SkColorType colorType = colorSpace && colorSpace->gammaIsLinear()
? kRGBA_F16_SkColorType : kN32_SkColorType;
SkImageInfo info = SkImageInfo::Make(size.width(), size.height(), colorType, at,
sk_ref_sp(colorSpace));
return SkSurface::MakeRaster(info);
}
private:
SkBitmap fBitmap;
typedef SkSpecialImage_Base INHERITED;
};
sk_sp<SkSpecialImage> SkSpecialImage::MakeFromRaster(const SkIRect& subset,
const SkBitmap& bm,
const SkSurfaceProps* props) {
SkASSERT(rect_fits(subset, bm.width(), bm.height()));
if (!bm.pixelRef()) {
return nullptr;
}
const SkBitmap* srcBM = &bm;
SkBitmap tmp;
// ImageFilters only handle N32 at the moment, so force our src to be that
if (!valid_for_imagefilters(bm.info())) {
if (!tmp.tryAllocPixels(bm.info().makeColorType(kN32_SkColorType)) ||
!bm.readPixels(tmp.info(), tmp.getPixels(), tmp.rowBytes(), 0, 0))
{
return nullptr;
}
srcBM = &tmp;
}
return sk_make_sp<SkSpecialImage_Raster>(subset, *srcBM, props);
}
#if SK_SUPPORT_GPU
///////////////////////////////////////////////////////////////////////////////
static sk_sp<SkImage> wrap_proxy_in_image(GrContext* context, sk_sp<GrTextureProxy> proxy,
SkAlphaType alphaType, sk_sp<SkColorSpace> colorSpace) {
return sk_make_sp<SkImage_Gpu>(context, kNeedNewImageUniqueID, alphaType,
std::move(proxy), std::move(colorSpace), SkBudgeted::kYes);
}
class SkSpecialImage_Gpu : public SkSpecialImage_Base {
public:
SkSpecialImage_Gpu(GrContext* context, const SkIRect& subset,
uint32_t uniqueID, sk_sp<GrTextureProxy> proxy, SkAlphaType at,
sk_sp<SkColorSpace> colorSpace, const SkSurfaceProps* props)
: INHERITED(subset, uniqueID, props)
, fContext(context)
, fTextureProxy(std::move(proxy))
, fAlphaType(at)
, fColorSpace(std::move(colorSpace))
, fAddedRasterVersionToCache(false) {
}
~SkSpecialImage_Gpu() override {
if (fAddedRasterVersionToCache.load()) {
SkNotifyBitmapGenIDIsStale(this->uniqueID());
}
}
SkAlphaType alphaType() const override { return fAlphaType; }
size_t getSize() const override { return fTextureProxy->gpuMemorySize(); }
void onDraw(SkCanvas* canvas, SkScalar x, SkScalar y, 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_Gpu
// 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_Gpu(canvas->getGrContext(),
this->uniqueID(), fAlphaType,
fTextureProxy,
fColorSpace, SkBudgeted::kNo));
canvas->drawImageRect(img, this->subset(),
dst, paint, SkCanvas::kStrict_SrcRectConstraint);
}
GrContext* onGetContext() const override { return fContext; }
sk_sp<GrTextureProxy> onAsTextureProxyRef(GrContext*) const override {
return fTextureProxy;
}
bool onGetROPixels(SkBitmap* dst) const override {
const auto desc = SkBitmapCacheDesc::Make(this->uniqueID(), this->width(), this->height());
if (SkBitmapCache::Find(desc, dst)) {
SkASSERT(dst->getGenerationID() == this->uniqueID());
SkASSERT(dst->isImmutable());
SkASSERT(dst->getPixels());
return true;
}
SkPixmap pmap;
SkImageInfo info = SkImageInfo::MakeN32(this->width(), this->height(),
this->alphaType(), fColorSpace);
auto rec = SkBitmapCache::Alloc(desc, info, &pmap);
if (!rec) {
return false;
}
sk_sp<GrSurfaceContext> sContext = fContext->contextPriv().makeWrappedSurfaceContext(
fTextureProxy, nullptr);
if (!sContext) {
return false;
}
if (!sContext->readPixels(info, pmap.writable_addr(), pmap.rowBytes(), 0, 0)) {
return false;
}
SkBitmapCache::Add(std::move(rec), dst);
fAddedRasterVersionToCache.store(true);
return true;
}
SkColorSpace* onGetColorSpace() const override {
return fColorSpace.get();
}
sk_sp<SkSpecialSurface> onMakeSurface(const SkImageFilter::OutputProperties& outProps,
const SkISize& size, SkAlphaType at) const override {
if (!fContext) {
return nullptr;
}
SkColorSpace* colorSpace = outProps.colorSpace();
return SkSpecialSurface::MakeRenderTarget(
fContext, size.width(), size.height(),
GrRenderableConfigForColorSpace(colorSpace), sk_ref_sp(colorSpace));
}
sk_sp<SkSpecialImage> onMakeSubset(const SkIRect& subset) const override {
return SkSpecialImage::MakeDeferredFromGpu(fContext,
subset,
this->uniqueID(),
fTextureProxy,
fColorSpace,
&this->props(),
fAlphaType);
}
// TODO: move all the logic here into the subset-flavor GrSurfaceProxy::copy?
sk_sp<SkImage> onAsImage(const SkIRect* subset) const override {
if (subset) {
// TODO: if this becomes a bottle neck we could base this logic on what the size
// will be when it is finally instantiated - but that is more fraught.
if (GrResourceProvider::IsFunctionallyExact(fTextureProxy.get()) &&
0 == subset->fLeft && 0 == subset->fTop &&
fTextureProxy->width() == subset->width() &&
fTextureProxy->height() == subset->height()) {
// The existing GrTexture is already tight so reuse it in the SkImage
return wrap_proxy_in_image(fContext, fTextureProxy, fAlphaType, fColorSpace);
}
sk_sp<GrTextureProxy> subsetProxy(GrSurfaceProxy::Copy(fContext, fTextureProxy.get(),
*subset, SkBudgeted::kYes));
if (!subsetProxy) {
return nullptr;
}
SkASSERT(subsetProxy->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(subsetProxy), fAlphaType, fColorSpace);
}
fTextureProxy->priv().exactify();
return wrap_proxy_in_image(fContext, fTextureProxy, fAlphaType, fColorSpace);
}
sk_sp<SkSurface> onMakeTightSurface(const SkImageFilter::OutputProperties& outProps,
const SkISize& size, SkAlphaType at) const override {
SkColorSpace* colorSpace = outProps.colorSpace();
SkColorType colorType = colorSpace && colorSpace->gammaIsLinear()
? kRGBA_F16_SkColorType : kRGBA_8888_SkColorType;
SkImageInfo info = SkImageInfo::Make(size.width(), size.height(), colorType, at,
sk_ref_sp(colorSpace));
return SkSurface::MakeRenderTarget(fContext, SkBudgeted::kYes, info);
}
private:
GrContext* fContext;
sk_sp<GrTextureProxy> fTextureProxy;
const SkAlphaType fAlphaType;
sk_sp<SkColorSpace> fColorSpace;
mutable SkAtomic<bool> fAddedRasterVersionToCache;
typedef SkSpecialImage_Base INHERITED;
};
sk_sp<SkSpecialImage> SkSpecialImage::MakeDeferredFromGpu(GrContext* context,
const SkIRect& subset,
uint32_t uniqueID,
sk_sp<GrTextureProxy> proxy,
sk_sp<SkColorSpace> colorSpace,
const SkSurfaceProps* props,
SkAlphaType at) {
SkASSERT(rect_fits(subset, proxy->width(), proxy->height()));
return sk_make_sp<SkSpecialImage_Gpu>(context, subset, uniqueID, std::move(proxy), at,
std::move(colorSpace), props);
}
#endif