SkBlurDrawLooper.cpp revision c73dd5c6880739f26216f198c757028fd28df1a4
1ec3ed6a5ebf6f2c406d7bcf94b6bc34fcaeb976eepoger@google.com 2ec3ed6a5ebf6f2c406d7bcf94b6bc34fcaeb976eepoger@google.com/* 3ec3ed6a5ebf6f2c406d7bcf94b6bc34fcaeb976eepoger@google.com * Copyright 2011 Google Inc. 4ec3ed6a5ebf6f2c406d7bcf94b6bc34fcaeb976eepoger@google.com * 5ec3ed6a5ebf6f2c406d7bcf94b6bc34fcaeb976eepoger@google.com * Use of this source code is governed by a BSD-style license that can be 6ec3ed6a5ebf6f2c406d7bcf94b6bc34fcaeb976eepoger@google.com * found in the LICENSE file. 7ec3ed6a5ebf6f2c406d7bcf94b6bc34fcaeb976eepoger@google.com */ 88a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com#include "SkBlurDrawLooper.h" 98a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com#include "SkBlurMaskFilter.h" 108a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com#include "SkCanvas.h" 11c73dd5c6880739f26216f198c757028fd28df1a4djsollen@google.com#include "SkFlattenableBuffers.h" 128a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com#include "SkPaint.h" 138a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com#include "SkMaskFilter.h" 144868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org#include "SkColorFilter.h" 158a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 168a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.comSkBlurDrawLooper::SkBlurDrawLooper(SkScalar radius, SkScalar dx, SkScalar dy, 17038aff623d9fd47946cd31685f74cf473f7c84f0senorblanco@chromium.org SkColor color, uint32_t flags) 18a728e35edcffd99216e3965a4b908ad0df7f69c2vandebo@chromium.org : fDx(dx), fDy(dy), fBlurColor(color), fBlurFlags(flags), fState(kDone) { 194e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com 20038aff623d9fd47946cd31685f74cf473f7c84f0senorblanco@chromium.org SkASSERT(flags <= kAll_BlurFlag); 214e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com if (radius > 0) { 2282065d667f64e232bcde2ad849756a6096fcbe6freed@google.com uint32_t blurFlags = flags & kIgnoreTransform_BlurFlag ? 2382065d667f64e232bcde2ad849756a6096fcbe6freed@google.com SkBlurMaskFilter::kIgnoreTransform_BlurFlag : 24038aff623d9fd47946cd31685f74cf473f7c84f0senorblanco@chromium.org SkBlurMaskFilter::kNone_BlurFlag; 25038aff623d9fd47946cd31685f74cf473f7c84f0senorblanco@chromium.org 264868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org blurFlags |= flags & kHighQuality_BlurFlag ? 274868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org SkBlurMaskFilter::kHighQuality_BlurFlag : 284868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org SkBlurMaskFilter::kNone_BlurFlag; 294868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org 308a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com fBlur = SkBlurMaskFilter::Create(radius, 314868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org SkBlurMaskFilter::kNormal_BlurStyle, 32038aff623d9fd47946cd31685f74cf473f7c84f0senorblanco@chromium.org blurFlags); 334e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com } else { 348a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com fBlur = NULL; 354868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org } 364868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org 374e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com if (flags & kOverrideColor_BlurFlag) { 38a6398911174d5445456ecb2f5f4f0565db2f100bjunov@google.com // Set alpha to 1 for the override since transparency will already 39a6398911174d5445456ecb2f5f4f0565db2f100bjunov@google.com // be baked into the blurred mask. 40a6398911174d5445456ecb2f5f4f0565db2f100bjunov@google.com SkColor opaqueColor = SkColorSetA(color, 255); 414868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org //The SrcIn xfer mode will multiply 'color' by the incoming alpha 424e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com fColorFilter = SkColorFilter::CreateModeFilter(opaqueColor, 434e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com SkXfermode::kSrcIn_Mode); 444e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com } else { 454868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org fColorFilter = NULL; 464868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org } 478a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com} 488a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 496bac947cd5bc460dd9166ada6310d678fd2e39f8reed@google.comSkBlurDrawLooper::SkBlurDrawLooper(SkFlattenableReadBuffer& buffer) 506bac947cd5bc460dd9166ada6310d678fd2e39f8reed@google.com: INHERITED(buffer) { 516bac947cd5bc460dd9166ada6310d678fd2e39f8reed@google.com 528a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com fDx = buffer.readScalar(); 538a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com fDy = buffer.readScalar(); 54c73dd5c6880739f26216f198c757028fd28df1a4djsollen@google.com fBlurColor = buffer.readColor(); 55c73dd5c6880739f26216f198c757028fd28df1a4djsollen@google.com fBlur = buffer.readFlattenableT<SkMaskFilter>(); 56c73dd5c6880739f26216f198c757028fd28df1a4djsollen@google.com fColorFilter = buffer.readFlattenableT<SkColorFilter>(); 57c73dd5c6880739f26216f198c757028fd28df1a4djsollen@google.com fBlurFlags = buffer.readUInt() & kAll_BlurFlag; 588a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com} 598a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 604e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.comSkBlurDrawLooper::~SkBlurDrawLooper() { 6182065d667f64e232bcde2ad849756a6096fcbe6freed@google.com SkSafeUnref(fBlur); 624868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org SkSafeUnref(fColorFilter); 638a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com} 648a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 6554924243c1b65b3ee6d8fa064b50a9b1bb2a19a5djsollen@google.comvoid SkBlurDrawLooper::flatten(SkFlattenableWriteBuffer& buffer) const { 6654924243c1b65b3ee6d8fa064b50a9b1bb2a19a5djsollen@google.com this->INHERITED::flatten(buffer); 678a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com buffer.writeScalar(fDx); 688a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com buffer.writeScalar(fDy); 69c73dd5c6880739f26216f198c757028fd28df1a4djsollen@google.com buffer.writeColor(fBlurColor); 708a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com buffer.writeFlattenable(fBlur); 714868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org buffer.writeFlattenable(fColorFilter); 72c73dd5c6880739f26216f198c757028fd28df1a4djsollen@google.com buffer.writeUInt(fBlurFlags); 738a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com} 748a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 754e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.comvoid SkBlurDrawLooper::init(SkCanvas* canvas) { 764e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com fState = kBeforeEdge; 778a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com} 788a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 794e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.combool SkBlurDrawLooper::next(SkCanvas* canvas, SkPaint* paint) { 808a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com switch (fState) { 814e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com case kBeforeEdge: 824e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com // we do nothing if a maskfilter is already installed 834e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com if (paint->getMaskFilter()) { 844e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com fState = kDone; 854e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com return false; 864e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com } 8756c69773aea56c6c6bd47bc7e7970dd081205184djsollen@google.com#ifdef SK_BUILD_FOR_ANDROID 88f5dbe2f00f853c6a1719924bdd0c33335a53423adjsollen@google.com SkColor blurColor; 89f5dbe2f00f853c6a1719924bdd0c33335a53423adjsollen@google.com blurColor = fBlurColor; 90f5dbe2f00f853c6a1719924bdd0c33335a53423adjsollen@google.com if (SkColorGetA(blurColor) == 255) { 91f5dbe2f00f853c6a1719924bdd0c33335a53423adjsollen@google.com blurColor = SkColorSetA(blurColor, paint->getAlpha()); 92f5dbe2f00f853c6a1719924bdd0c33335a53423adjsollen@google.com } 93f5dbe2f00f853c6a1719924bdd0c33335a53423adjsollen@google.com paint->setColor(blurColor); 94f5dbe2f00f853c6a1719924bdd0c33335a53423adjsollen@google.com#else 954e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com paint->setColor(fBlurColor); 96f5dbe2f00f853c6a1719924bdd0c33335a53423adjsollen@google.com#endif 974e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com paint->setMaskFilter(fBlur); 984e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com paint->setColorFilter(fColorFilter); 994e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com canvas->save(SkCanvas::kMatrix_SaveFlag); 1004e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com if (fBlurFlags & kIgnoreTransform_BlurFlag) { 1014e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com SkMatrix transform(canvas->getTotalMatrix()); 1024e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com transform.postTranslate(fDx, fDy); 1034e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com canvas->setMatrix(transform); 1044e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com } else { 1054e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com canvas->translate(fDx, fDy); 1064e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com } 1074e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com fState = kAfterEdge; 1084e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com return true; 1094e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com case kAfterEdge: 1104e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com canvas->restore(); 1114e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com fState = kDone; 1124e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com return true; 1134e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com default: 1144e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com SkASSERT(kDone == fState); 1154e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com return false; 1168a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com } 1178a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com} 1188a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 1198a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com/////////////////////////////////////////////////////////////////////////////// 1208a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 121d26147adbbdca85f07dff432025afee0c8614387caryclark@google.comSK_DEFINE_FLATTENABLE_REGISTRAR(SkBlurDrawLooper) 1228a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 123