| /* |
| * Copyright 2014 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "SkPictureShader.h" |
| |
| #include "SkBitmap.h" |
| #include "SkBitmapProcShader.h" |
| #include "SkCanvas.h" |
| #include "SkImageGenerator.h" |
| #include "SkMatrixUtils.h" |
| #include "SkPicture.h" |
| #include "SkReadBuffer.h" |
| #include "SkResourceCache.h" |
| |
| #if SK_SUPPORT_GPU |
| #include "GrContext.h" |
| #include "GrCaps.h" |
| #endif |
| |
| namespace { |
| static unsigned gBitmapSkaderKeyNamespaceLabel; |
| |
| struct BitmapShaderKey : public SkResourceCache::Key { |
| public: |
| BitmapShaderKey(uint32_t pictureID, |
| const SkRect& tile, |
| SkShader::TileMode tmx, |
| SkShader::TileMode tmy, |
| const SkSize& scale, |
| const SkMatrix& localMatrix) |
| : fPictureID(pictureID) |
| , fTile(tile) |
| , fTmx(tmx) |
| , fTmy(tmy) |
| , fScale(scale) { |
| |
| for (int i = 0; i < 9; ++i) { |
| fLocalMatrixStorage[i] = localMatrix[i]; |
| } |
| |
| static const size_t keySize = sizeof(fPictureID) + |
| sizeof(fTile) + |
| sizeof(fTmx) + sizeof(fTmy) + |
| sizeof(fScale) + |
| sizeof(fLocalMatrixStorage); |
| // This better be packed. |
| SkASSERT(sizeof(uint32_t) * (&fEndOfStruct - &fPictureID) == keySize); |
| this->init(&gBitmapSkaderKeyNamespaceLabel, 0, keySize); |
| } |
| |
| private: |
| uint32_t fPictureID; |
| SkRect fTile; |
| SkShader::TileMode fTmx, fTmy; |
| SkSize fScale; |
| SkScalar fLocalMatrixStorage[9]; |
| |
| SkDEBUGCODE(uint32_t fEndOfStruct;) |
| }; |
| |
| struct BitmapShaderRec : public SkResourceCache::Rec { |
| BitmapShaderRec(const BitmapShaderKey& key, SkShader* tileShader, size_t bitmapBytes) |
| : fKey(key) |
| , fShader(SkRef(tileShader)) |
| , fBitmapBytes(bitmapBytes) {} |
| |
| BitmapShaderKey fKey; |
| SkAutoTUnref<SkShader> fShader; |
| size_t fBitmapBytes; |
| |
| const Key& getKey() const override { return fKey; } |
| size_t bytesUsed() const override { |
| return sizeof(fKey) + sizeof(SkShader) + fBitmapBytes; |
| } |
| const char* getCategory() const override { return "bitmap-shader"; } |
| SkDiscardableMemory* diagnostic_only_getDiscardable() const override { return nullptr; } |
| |
| static bool Visitor(const SkResourceCache::Rec& baseRec, void* contextShader) { |
| const BitmapShaderRec& rec = static_cast<const BitmapShaderRec&>(baseRec); |
| SkAutoTUnref<SkShader>* result = reinterpret_cast<SkAutoTUnref<SkShader>*>(contextShader); |
| |
| result->reset(SkRef(rec.fShader.get())); |
| |
| // The bitmap shader is backed by an image generator, thus it can always re-generate its |
| // pixels if discarded. |
| return true; |
| } |
| }; |
| |
| } // namespace |
| |
| SkPictureShader::SkPictureShader(const SkPicture* picture, TileMode tmx, TileMode tmy, |
| const SkMatrix* localMatrix, const SkRect* tile) |
| : INHERITED(localMatrix) |
| , fPicture(SkRef(picture)) |
| , fTile(tile ? *tile : picture->cullRect()) |
| , fTmx(tmx) |
| , fTmy(tmy) { |
| } |
| |
| SkShader* SkPictureShader::Create(const SkPicture* picture, TileMode tmx, TileMode tmy, |
| const SkMatrix* localMatrix, const SkRect* tile) { |
| if (!picture || picture->cullRect().isEmpty() || (tile && tile->isEmpty())) { |
| return SkShader::CreateEmptyShader(); |
| } |
| return new SkPictureShader(picture, tmx, tmy, localMatrix, tile); |
| } |
| |
| SkFlattenable* SkPictureShader::CreateProc(SkReadBuffer& buffer) { |
| SkMatrix lm; |
| buffer.readMatrix(&lm); |
| TileMode mx = (TileMode)buffer.read32(); |
| TileMode my = (TileMode)buffer.read32(); |
| SkRect tile; |
| buffer.readRect(&tile); |
| |
| SkAutoTUnref<SkPicture> picture; |
| |
| if (buffer.isCrossProcess() && SkPicture::PictureIOSecurityPrecautionsEnabled()) { |
| if (buffer.isVersionLT(SkReadBuffer::kPictureShaderHasPictureBool_Version)) { |
| // Older code blindly serialized pictures. We don't trust them. |
| buffer.validate(false); |
| return nullptr; |
| } |
| // Newer code won't serialize pictures in disallow-cross-process-picture mode. |
| // Assert that they didn't serialize anything except a false here. |
| buffer.validate(!buffer.readBool()); |
| } else { |
| // Old code always serialized the picture. New code writes a 'true' first if it did. |
| if (buffer.isVersionLT(SkReadBuffer::kPictureShaderHasPictureBool_Version) || |
| buffer.readBool()) { |
| picture.reset(SkPicture::CreateFromBuffer(buffer)); |
| } |
| } |
| return SkPictureShader::Create(picture, mx, my, &lm, &tile); |
| } |
| |
| void SkPictureShader::flatten(SkWriteBuffer& buffer) const { |
| buffer.writeMatrix(this->getLocalMatrix()); |
| buffer.write32(fTmx); |
| buffer.write32(fTmy); |
| buffer.writeRect(fTile); |
| |
| // The deserialization code won't trust that our serialized picture is safe to deserialize. |
| // So write a 'false' telling it that we're not serializing a picture. |
| if (buffer.isCrossProcess() && SkPicture::PictureIOSecurityPrecautionsEnabled()) { |
| buffer.writeBool(false); |
| } else { |
| buffer.writeBool(true); |
| fPicture->flatten(buffer); |
| } |
| } |
| |
| SkShader* SkPictureShader::refBitmapShader(const SkMatrix& viewMatrix, const SkMatrix* localM, |
| const int maxTextureSize) const { |
| SkASSERT(fPicture && !fPicture->cullRect().isEmpty()); |
| |
| SkMatrix m; |
| m.setConcat(viewMatrix, this->getLocalMatrix()); |
| if (localM) { |
| m.preConcat(*localM); |
| } |
| |
| // Use a rotation-invariant scale |
| SkPoint scale; |
| // |
| // TODO: replace this with decomposeScale() -- but beware LayoutTest rebaselines! |
| // |
| if (!SkDecomposeUpper2x2(m, nullptr, &scale, nullptr)) { |
| // Decomposition failed, use an approximation. |
| scale.set(SkScalarSqrt(m.getScaleX() * m.getScaleX() + m.getSkewX() * m.getSkewX()), |
| SkScalarSqrt(m.getScaleY() * m.getScaleY() + m.getSkewY() * m.getSkewY())); |
| } |
| SkSize scaledSize = SkSize::Make(SkScalarAbs(scale.x() * fTile.width()), |
| SkScalarAbs(scale.y() * fTile.height())); |
| |
| // Clamp the tile size to about 4M pixels |
| static const SkScalar kMaxTileArea = 2048 * 2048; |
| SkScalar tileArea = SkScalarMul(scaledSize.width(), scaledSize.height()); |
| if (tileArea > kMaxTileArea) { |
| SkScalar clampScale = SkScalarSqrt(kMaxTileArea / tileArea); |
| scaledSize.set(SkScalarMul(scaledSize.width(), clampScale), |
| SkScalarMul(scaledSize.height(), clampScale)); |
| } |
| #if SK_SUPPORT_GPU |
| // Scale down the tile size if larger than maxTextureSize for GPU Path or it should fail on create texture |
| if (maxTextureSize) { |
| if (scaledSize.width() > maxTextureSize || scaledSize.height() > maxTextureSize) { |
| SkScalar downScale = maxTextureSize / SkMaxScalar(scaledSize.width(), scaledSize.height()); |
| scaledSize.set(SkScalarFloorToScalar(SkScalarMul(scaledSize.width(), downScale)), |
| SkScalarFloorToScalar(SkScalarMul(scaledSize.height(), downScale))); |
| } |
| } |
| #endif |
| |
| SkISize tileSize = scaledSize.toRound(); |
| if (tileSize.isEmpty()) { |
| return SkShader::CreateEmptyShader(); |
| } |
| |
| // The actual scale, compensating for rounding & clamping. |
| SkSize tileScale = SkSize::Make(SkIntToScalar(tileSize.width()) / fTile.width(), |
| SkIntToScalar(tileSize.height()) / fTile.height()); |
| |
| SkAutoTUnref<SkShader> tileShader; |
| BitmapShaderKey key(fPicture->uniqueID(), |
| fTile, |
| fTmx, |
| fTmy, |
| tileScale, |
| this->getLocalMatrix()); |
| |
| if (!SkResourceCache::Find(key, BitmapShaderRec::Visitor, &tileShader)) { |
| SkMatrix tileMatrix; |
| tileMatrix.setRectToRect(fTile, SkRect::MakeIWH(tileSize.width(), tileSize.height()), |
| SkMatrix::kFill_ScaleToFit); |
| SkBitmap bm; |
| if (!SkDEPRECATED_InstallDiscardablePixelRef( |
| SkImageGenerator::NewFromPicture(tileSize, fPicture, &tileMatrix, nullptr), &bm)) { |
| return nullptr; |
| } |
| |
| SkMatrix shaderMatrix = this->getLocalMatrix(); |
| shaderMatrix.preScale(1 / tileScale.width(), 1 / tileScale.height()); |
| tileShader.reset(CreateBitmapShader(bm, fTmx, fTmy, &shaderMatrix)); |
| |
| SkResourceCache::Add(new BitmapShaderRec(key, tileShader.get(), bm.getSize())); |
| } |
| |
| return tileShader.detach(); |
| } |
| |
| size_t SkPictureShader::contextSize() const { |
| return sizeof(PictureShaderContext); |
| } |
| |
| SkShader::Context* SkPictureShader::onCreateContext(const ContextRec& rec, void* storage) const { |
| SkAutoTUnref<SkShader> bitmapShader(this->refBitmapShader(*rec.fMatrix, rec.fLocalMatrix)); |
| if (nullptr == bitmapShader.get()) { |
| return nullptr; |
| } |
| return PictureShaderContext::Create(storage, *this, rec, bitmapShader); |
| } |
| |
| ///////////////////////////////////////////////////////////////////////////////////////// |
| |
| SkShader::Context* SkPictureShader::PictureShaderContext::Create(void* storage, |
| const SkPictureShader& shader, const ContextRec& rec, SkShader* bitmapShader) { |
| PictureShaderContext* ctx = new (storage) PictureShaderContext(shader, rec, bitmapShader); |
| if (nullptr == ctx->fBitmapShaderContext) { |
| ctx->~PictureShaderContext(); |
| ctx = nullptr; |
| } |
| return ctx; |
| } |
| |
| SkPictureShader::PictureShaderContext::PictureShaderContext( |
| const SkPictureShader& shader, const ContextRec& rec, SkShader* bitmapShader) |
| : INHERITED(shader, rec) |
| , fBitmapShader(SkRef(bitmapShader)) |
| { |
| fBitmapShaderContextStorage = sk_malloc_throw(bitmapShader->contextSize()); |
| fBitmapShaderContext = bitmapShader->createContext(rec, fBitmapShaderContextStorage); |
| //if fBitmapShaderContext is null, we are invalid |
| } |
| |
| SkPictureShader::PictureShaderContext::~PictureShaderContext() { |
| if (fBitmapShaderContext) { |
| fBitmapShaderContext->~Context(); |
| } |
| sk_free(fBitmapShaderContextStorage); |
| } |
| |
| uint32_t SkPictureShader::PictureShaderContext::getFlags() const { |
| SkASSERT(fBitmapShaderContext); |
| return fBitmapShaderContext->getFlags(); |
| } |
| |
| SkShader::Context::ShadeProc SkPictureShader::PictureShaderContext::asAShadeProc(void** ctx) { |
| SkASSERT(fBitmapShaderContext); |
| return fBitmapShaderContext->asAShadeProc(ctx); |
| } |
| |
| void SkPictureShader::PictureShaderContext::shadeSpan(int x, int y, SkPMColor dstC[], int count) { |
| SkASSERT(fBitmapShaderContext); |
| fBitmapShaderContext->shadeSpan(x, y, dstC, count); |
| } |
| |
| #ifndef SK_IGNORE_TO_STRING |
| void SkPictureShader::toString(SkString* str) const { |
| static const char* gTileModeName[SkShader::kTileModeCount] = { |
| "clamp", "repeat", "mirror" |
| }; |
| |
| str->appendf("PictureShader: [%f:%f:%f:%f] ", |
| fPicture->cullRect().fLeft, |
| fPicture->cullRect().fTop, |
| fPicture->cullRect().fRight, |
| fPicture->cullRect().fBottom); |
| |
| str->appendf("(%s, %s)", gTileModeName[fTmx], gTileModeName[fTmy]); |
| |
| this->INHERITED::toString(str); |
| } |
| #endif |
| |
| #if SK_SUPPORT_GPU |
| const GrFragmentProcessor* SkPictureShader::asFragmentProcessor( |
| GrContext* context, |
| const SkMatrix& viewM, |
| const SkMatrix* localMatrix, |
| SkFilterQuality fq) const { |
| int maxTextureSize = 0; |
| if (context) { |
| maxTextureSize = context->caps()->maxTextureSize(); |
| } |
| SkAutoTUnref<SkShader> bitmapShader(this->refBitmapShader(viewM, localMatrix, maxTextureSize)); |
| if (!bitmapShader) { |
| return nullptr; |
| } |
| return bitmapShader->asFragmentProcessor(context, viewM, nullptr, fq); |
| } |
| #endif |