| /* |
| * 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 "SkMatrixUtils.h" |
| #include "SkPicture.h" |
| #include "SkReadBuffer.h" |
| |
| #if SK_SUPPORT_GPU |
| #include "GrContext.h" |
| #endif |
| |
| SkPictureShader::SkPictureShader(const SkPicture* picture, TileMode tmx, TileMode tmy, |
| const SkMatrix* localMatrix, const SkRect* tile) |
| : INHERITED(localMatrix) |
| , fPicture(SkRef(picture)) |
| , fTmx(tmx) |
| , fTmy(tmy) { |
| fTile = tile ? *tile : SkRect::MakeWH(SkIntToScalar(picture->width()), |
| SkIntToScalar(picture->height())); |
| } |
| |
| SkPictureShader::SkPictureShader(SkReadBuffer& buffer) |
| : INHERITED(buffer) { |
| fTmx = static_cast<SkShader::TileMode>(buffer.read32()); |
| fTmy = static_cast<SkShader::TileMode>(buffer.read32()); |
| buffer.readRect(&fTile); |
| fPicture = SkPicture::CreateFromBuffer(buffer); |
| } |
| |
| SkPictureShader::~SkPictureShader() { |
| fPicture->unref(); |
| } |
| |
| SkPictureShader* SkPictureShader::Create(const SkPicture* picture, TileMode tmx, TileMode tmy, |
| const SkMatrix* localMatrix, const SkRect* tile) { |
| if (!picture || 0 == picture->width() || 0 == picture->height() |
| || (NULL != tile && tile->isEmpty())) { |
| return NULL; |
| } |
| return SkNEW_ARGS(SkPictureShader, (picture, tmx, tmy, localMatrix, tile)); |
| } |
| |
| void SkPictureShader::flatten(SkWriteBuffer& buffer) const { |
| this->INHERITED::flatten(buffer); |
| |
| buffer.write32(fTmx); |
| buffer.write32(fTmy); |
| buffer.writeRect(fTile); |
| fPicture->flatten(buffer); |
| } |
| |
| SkShader* SkPictureShader::refBitmapShader(const SkMatrix& matrix, const SkMatrix* localM) const { |
| SkASSERT(fPicture && fPicture->width() > 0 && fPicture->height() > 0); |
| |
| SkMatrix m; |
| m.setConcat(matrix, this->getLocalMatrix()); |
| if (localM) { |
| m.preConcat(*localM); |
| } |
| |
| // Use a rotation-invariant scale |
| SkPoint scale; |
| if (!SkDecomposeUpper2x2(m, NULL, &scale, NULL)) { |
| // 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(scale.x() * fTile.width(), scale.y() * fTile.height()); |
| |
| // Clamp the tile size to about 16M pixels |
| static const SkScalar kMaxTileArea = 4096 * 4096; |
| SkScalar tileArea = SkScalarMul(scaledSize.width(), scaledSize.height()); |
| if (tileArea > kMaxTileArea) { |
| SkScalar clampScale = SkScalarSqrt(SkScalarDiv(kMaxTileArea, tileArea)); |
| scaledSize.set(SkScalarMul(scaledSize.width(), clampScale), |
| SkScalarMul(scaledSize.height(), clampScale)); |
| } |
| |
| SkISize tileSize = scaledSize.toRound(); |
| if (tileSize.isEmpty()) { |
| return NULL; |
| } |
| |
| // The actual scale, compensating for rounding & clamping. |
| SkSize tileScale = SkSize::Make(SkIntToScalar(tileSize.width()) / fTile.width(), |
| SkIntToScalar(tileSize.height()) / fTile.height()); |
| |
| SkAutoMutexAcquire ama(fCachedBitmapShaderMutex); |
| |
| if (!fCachedBitmapShader || tileScale != fCachedTileScale) { |
| SkBitmap bm; |
| if (!bm.allocN32Pixels(tileSize.width(), tileSize.height())) { |
| return NULL; |
| } |
| bm.eraseColor(SK_ColorTRANSPARENT); |
| |
| SkCanvas canvas(bm); |
| canvas.scale(tileScale.width(), tileScale.height()); |
| canvas.translate(fTile.x(), fTile.y()); |
| canvas.drawPicture(fPicture); |
| |
| fCachedTileScale = tileScale; |
| |
| SkMatrix shaderMatrix = this->getLocalMatrix(); |
| shaderMatrix.preScale(1 / tileScale.width(), 1 / tileScale.height()); |
| fCachedBitmapShader.reset(CreateBitmapShader(bm, fTmx, fTmy, &shaderMatrix)); |
| } |
| |
| // Increment the ref counter inside the mutex to ensure the returned pointer is still valid. |
| // Otherwise, the pointer may have been overwritten on a different thread before the object's |
| // ref count was incremented. |
| fCachedBitmapShader.get()->ref(); |
| return fCachedBitmapShader; |
| } |
| |
| 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 (NULL == bitmapShader.get()) { |
| return NULL; |
| } |
| return PictureShaderContext::Create(storage, *this, rec, bitmapShader); |
| } |
| |
| ///////////////////////////////////////////////////////////////////////////////////////// |
| |
| SkShader::Context* SkPictureShader::PictureShaderContext::Create(void* storage, |
| const SkPictureShader& shader, const ContextRec& rec, SkShader* bitmapShader) { |
| PictureShaderContext* ctx = SkNEW_PLACEMENT_ARGS(storage, PictureShaderContext, |
| (shader, rec, bitmapShader)); |
| if (NULL == ctx->fBitmapShaderContext) { |
| ctx->~PictureShaderContext(); |
| ctx = NULL; |
| } |
| 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); |
| } |
| |
| void SkPictureShader::PictureShaderContext::shadeSpan16(int x, int y, uint16_t dstC[], int count) { |
| SkASSERT(fBitmapShaderContext); |
| fBitmapShaderContext->shadeSpan16(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: [%d:%d] ", |
| fPicture ? fPicture->width() : 0, |
| fPicture ? fPicture->height() : 0); |
| |
| str->appendf("(%s, %s)", gTileModeName[fTmx], gTileModeName[fTmy]); |
| |
| this->INHERITED::toString(str); |
| } |
| #endif |
| |
| #if SK_SUPPORT_GPU |
| bool SkPictureShader::asNewEffect(GrContext* context, const SkPaint& paint, |
| const SkMatrix* localMatrix, GrColor* paintColor, |
| GrEffect** effect) const { |
| SkAutoTUnref<SkShader> bitmapShader(this->refBitmapShader(context->getMatrix(), localMatrix)); |
| if (!bitmapShader) { |
| return false; |
| } |
| return bitmapShader->asNewEffect(context, paint, NULL, paintColor, effect); |
| } |
| #else |
| bool SkPictureShader::asNewEffect(GrContext* context, const SkPaint& paint, |
| const SkMatrix* localMatrix, GrColor* paintColor, |
| GrEffect** effect) const { |
| SkDEBUGFAIL("Should not call in GPU-less build"); |
| return false; |
| } |
| #endif |