| /* |
| * 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(SkPicture* picture, TileMode tmx, TileMode tmy) |
| : fPicture(picture) |
| , fTmx(tmx) |
| , fTmy(tmy) { |
| SkSafeRef(fPicture); |
| } |
| |
| SkPictureShader::SkPictureShader(SkReadBuffer& buffer) |
| : INHERITED(buffer) { |
| fTmx = static_cast<SkShader::TileMode>(buffer.read32()); |
| fTmy = static_cast<SkShader::TileMode>(buffer.read32()); |
| if (buffer.readBool()) { |
| fPicture = SkPicture::CreateFromBuffer(buffer); |
| } else { |
| fPicture = NULL; |
| } |
| } |
| |
| SkPictureShader::~SkPictureShader() { |
| SkSafeUnref(fPicture); |
| } |
| |
| SkPictureShader* SkPictureShader::Create(SkPicture* picture, TileMode tmx, TileMode tmy) { |
| return SkNEW_ARGS(SkPictureShader, (picture, tmx, tmy)); |
| } |
| |
| void SkPictureShader::flatten(SkWriteBuffer& buffer) const { |
| this->INHERITED::flatten(buffer); |
| |
| buffer.write32(fTmx); |
| buffer.write32(fTmy); |
| buffer.writeBool(NULL != fPicture); |
| if (fPicture) { |
| fPicture->flatten(buffer); |
| } |
| } |
| |
| bool SkPictureShader::buildBitmapShader(const SkMatrix& matrix) const { |
| if (!fPicture || (0 == fPicture->width() && 0 == fPicture->height())) { |
| return false; |
| } |
| |
| SkMatrix m; |
| if (this->hasLocalMatrix()) { |
| m.setConcat(matrix, this->getLocalMatrix()); |
| } else { |
| m = matrix; |
| } |
| |
| // 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() * fPicture->width(), scale.y() * fPicture->height()); |
| |
| SkISize tileSize = scaledSize.toRound(); |
| if (tileSize.isEmpty()) { |
| return false; |
| } |
| |
| // The actual scale, compensating for rounding. |
| SkSize tileScale = SkSize::Make(SkIntToScalar(tileSize.width()) / fPicture->width(), |
| SkIntToScalar(tileSize.height()) / fPicture->height()); |
| |
| if (!fCachedShader || tileScale != fCachedTileScale) { |
| SkBitmap bm; |
| if (!bm.allocN32Pixels(tileSize.width(), tileSize.height())) { |
| return false; |
| } |
| bm.eraseColor(SK_ColorTRANSPARENT); |
| |
| SkCanvas canvas(bm); |
| canvas.scale(tileScale.width(), tileScale.height()); |
| canvas.drawPicture(*fPicture); |
| |
| fCachedShader.reset(CreateBitmapShader(bm, fTmx, fTmy)); |
| fCachedTileScale = tileScale; |
| } |
| |
| SkMatrix shaderMatrix = this->getLocalMatrix(); |
| shaderMatrix.preScale(1 / tileScale.width(), 1 / tileScale.height()); |
| fCachedShader->setLocalMatrix(shaderMatrix); |
| |
| return true; |
| } |
| |
| bool SkPictureShader::setContext(const SkBitmap& device, |
| const SkPaint& paint, |
| const SkMatrix& matrix) { |
| if (!this->buildBitmapShader(matrix)) { |
| return false; |
| } |
| |
| if (!this->INHERITED::setContext(device, paint, matrix)) { |
| return false; |
| } |
| |
| SkASSERT(fCachedShader); |
| if (!fCachedShader->setContext(device, paint, matrix)) { |
| this->INHERITED::endContext(); |
| return false; |
| } |
| |
| return true; |
| } |
| |
| void SkPictureShader::endContext() { |
| SkASSERT(fCachedShader); |
| fCachedShader->endContext(); |
| |
| this->INHERITED::endContext(); |
| } |
| |
| uint32_t SkPictureShader::getFlags() { |
| if (NULL != fCachedShader) { |
| return fCachedShader->getFlags(); |
| } |
| return 0; |
| } |
| |
| SkShader::ShadeProc SkPictureShader::asAShadeProc(void** ctx) { |
| if (fCachedShader) { |
| return fCachedShader->asAShadeProc(ctx); |
| } |
| return NULL; |
| } |
| |
| void SkPictureShader::shadeSpan(int x, int y, SkPMColor dstC[], int count) { |
| SkASSERT(fCachedShader); |
| fCachedShader->shadeSpan(x, y, dstC, count); |
| } |
| |
| void SkPictureShader::shadeSpan16(int x, int y, uint16_t dstC[], int count) { |
| SkASSERT(fCachedShader); |
| fCachedShader->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 |
| GrEffectRef* SkPictureShader::asNewEffect(GrContext* context, const SkPaint& paint) const { |
| if (!this->buildBitmapShader(context->getMatrix())) { |
| return NULL; |
| } |
| SkASSERT(fCachedShader); |
| return fCachedShader->asNewEffect(context, paint); |
| } |
| #endif |