SkBlurDrawLooper.cpp revision 4991b8f23482afc1494fd17647421ce68de53331
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" 114991b8f23482afc1494fd17647421ce68de53331robertphillips@google.com#include "SkColorFilter.h" 12c73dd5c6880739f26216f198c757028fd28df1a4djsollen@google.com#include "SkFlattenableBuffers.h" 138a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com#include "SkMaskFilter.h" 144991b8f23482afc1494fd17647421ce68de53331robertphillips@google.com#include "SkPaint.h" 154991b8f23482afc1494fd17647421ce68de53331robertphillips@google.com#include "SkString.h" 164991b8f23482afc1494fd17647421ce68de53331robertphillips@google.com#include "SkStringUtils.h" 178a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 188a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.comSkBlurDrawLooper::SkBlurDrawLooper(SkScalar radius, SkScalar dx, SkScalar dy, 19038aff623d9fd47946cd31685f74cf473f7c84f0senorblanco@chromium.org SkColor color, uint32_t flags) 20a728e35edcffd99216e3965a4b908ad0df7f69c2vandebo@chromium.org : fDx(dx), fDy(dy), fBlurColor(color), fBlurFlags(flags), fState(kDone) { 214e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com 22038aff623d9fd47946cd31685f74cf473f7c84f0senorblanco@chromium.org SkASSERT(flags <= kAll_BlurFlag); 234e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com if (radius > 0) { 2482065d667f64e232bcde2ad849756a6096fcbe6freed@google.com uint32_t blurFlags = flags & kIgnoreTransform_BlurFlag ? 2582065d667f64e232bcde2ad849756a6096fcbe6freed@google.com SkBlurMaskFilter::kIgnoreTransform_BlurFlag : 26038aff623d9fd47946cd31685f74cf473f7c84f0senorblanco@chromium.org SkBlurMaskFilter::kNone_BlurFlag; 27038aff623d9fd47946cd31685f74cf473f7c84f0senorblanco@chromium.org 284868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org blurFlags |= flags & kHighQuality_BlurFlag ? 29fbfcd5602128ec010c82cb733c9cdc0a3254f9f3rmistry@google.com SkBlurMaskFilter::kHighQuality_BlurFlag : 304868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org SkBlurMaskFilter::kNone_BlurFlag; 314868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org 328a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com fBlur = SkBlurMaskFilter::Create(radius, 33fbfcd5602128ec010c82cb733c9cdc0a3254f9f3rmistry@google.com SkBlurMaskFilter::kNormal_BlurStyle, 34038aff623d9fd47946cd31685f74cf473f7c84f0senorblanco@chromium.org blurFlags); 354e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com } else { 368a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com fBlur = NULL; 374868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org } 384868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org 394e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com if (flags & kOverrideColor_BlurFlag) { 40a6398911174d5445456ecb2f5f4f0565db2f100bjunov@google.com // Set alpha to 1 for the override since transparency will already 41a6398911174d5445456ecb2f5f4f0565db2f100bjunov@google.com // be baked into the blurred mask. 42a6398911174d5445456ecb2f5f4f0565db2f100bjunov@google.com SkColor opaqueColor = SkColorSetA(color, 255); 434868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org //The SrcIn xfer mode will multiply 'color' by the incoming alpha 444e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com fColorFilter = SkColorFilter::CreateModeFilter(opaqueColor, 454e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com SkXfermode::kSrcIn_Mode); 464e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com } else { 474868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org fColorFilter = NULL; 484868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org } 498a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com} 508a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 516bac947cd5bc460dd9166ada6310d678fd2e39f8reed@google.comSkBlurDrawLooper::SkBlurDrawLooper(SkFlattenableReadBuffer& buffer) 526bac947cd5bc460dd9166ada6310d678fd2e39f8reed@google.com: INHERITED(buffer) { 536bac947cd5bc460dd9166ada6310d678fd2e39f8reed@google.com 548a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com fDx = buffer.readScalar(); 558a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com fDy = buffer.readScalar(); 56c73dd5c6880739f26216f198c757028fd28df1a4djsollen@google.com fBlurColor = buffer.readColor(); 57c73dd5c6880739f26216f198c757028fd28df1a4djsollen@google.com fBlur = buffer.readFlattenableT<SkMaskFilter>(); 58c73dd5c6880739f26216f198c757028fd28df1a4djsollen@google.com fColorFilter = buffer.readFlattenableT<SkColorFilter>(); 59c73dd5c6880739f26216f198c757028fd28df1a4djsollen@google.com fBlurFlags = buffer.readUInt() & kAll_BlurFlag; 608a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com} 618a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 624e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.comSkBlurDrawLooper::~SkBlurDrawLooper() { 6382065d667f64e232bcde2ad849756a6096fcbe6freed@google.com SkSafeUnref(fBlur); 644868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org SkSafeUnref(fColorFilter); 658a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com} 668a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 6754924243c1b65b3ee6d8fa064b50a9b1bb2a19a5djsollen@google.comvoid SkBlurDrawLooper::flatten(SkFlattenableWriteBuffer& buffer) const { 6854924243c1b65b3ee6d8fa064b50a9b1bb2a19a5djsollen@google.com this->INHERITED::flatten(buffer); 698a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com buffer.writeScalar(fDx); 708a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com buffer.writeScalar(fDy); 71c73dd5c6880739f26216f198c757028fd28df1a4djsollen@google.com buffer.writeColor(fBlurColor); 728a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com buffer.writeFlattenable(fBlur); 734868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org buffer.writeFlattenable(fColorFilter); 74c73dd5c6880739f26216f198c757028fd28df1a4djsollen@google.com buffer.writeUInt(fBlurFlags); 758a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com} 768a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 774e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.comvoid SkBlurDrawLooper::init(SkCanvas* canvas) { 784e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com fState = kBeforeEdge; 798a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com} 808a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 814e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.combool SkBlurDrawLooper::next(SkCanvas* canvas, SkPaint* paint) { 828a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com switch (fState) { 834e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com case kBeforeEdge: 844e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com // we do nothing if a maskfilter is already installed 854e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com if (paint->getMaskFilter()) { 864e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com fState = kDone; 874e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com return false; 884e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com } 8956c69773aea56c6c6bd47bc7e7970dd081205184djsollen@google.com#ifdef SK_BUILD_FOR_ANDROID 90f5dbe2f00f853c6a1719924bdd0c33335a53423adjsollen@google.com SkColor blurColor; 91f5dbe2f00f853c6a1719924bdd0c33335a53423adjsollen@google.com blurColor = fBlurColor; 92f5dbe2f00f853c6a1719924bdd0c33335a53423adjsollen@google.com if (SkColorGetA(blurColor) == 255) { 93f5dbe2f00f853c6a1719924bdd0c33335a53423adjsollen@google.com blurColor = SkColorSetA(blurColor, paint->getAlpha()); 94f5dbe2f00f853c6a1719924bdd0c33335a53423adjsollen@google.com } 95f5dbe2f00f853c6a1719924bdd0c33335a53423adjsollen@google.com paint->setColor(blurColor); 96f5dbe2f00f853c6a1719924bdd0c33335a53423adjsollen@google.com#else 974e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com paint->setColor(fBlurColor); 98f5dbe2f00f853c6a1719924bdd0c33335a53423adjsollen@google.com#endif 994e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com paint->setMaskFilter(fBlur); 1004e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com paint->setColorFilter(fColorFilter); 1014e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com canvas->save(SkCanvas::kMatrix_SaveFlag); 1024e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com if (fBlurFlags & kIgnoreTransform_BlurFlag) { 1034e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com SkMatrix transform(canvas->getTotalMatrix()); 1044e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com transform.postTranslate(fDx, fDy); 1054e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com canvas->setMatrix(transform); 1064e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com } else { 1074e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com canvas->translate(fDx, fDy); 1084e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com } 1094e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com fState = kAfterEdge; 1104e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com return true; 1114e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com case kAfterEdge: 1124e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com canvas->restore(); 1134e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com fState = kDone; 1144e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com return true; 1154e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com default: 1164e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com SkASSERT(kDone == fState); 1174e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com return false; 1188a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com } 1198a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com} 1204991b8f23482afc1494fd17647421ce68de53331robertphillips@google.com 1214991b8f23482afc1494fd17647421ce68de53331robertphillips@google.com#ifdef SK_DEVELOPER 1224991b8f23482afc1494fd17647421ce68de53331robertphillips@google.comvoid SkBlurDrawLooper::toString(SkString* str) const { 1234991b8f23482afc1494fd17647421ce68de53331robertphillips@google.com str->append("SkBlurDrawLooper: "); 1244991b8f23482afc1494fd17647421ce68de53331robertphillips@google.com 1254991b8f23482afc1494fd17647421ce68de53331robertphillips@google.com str->append("dx: "); 1264991b8f23482afc1494fd17647421ce68de53331robertphillips@google.com str->appendScalar(fDx); 1274991b8f23482afc1494fd17647421ce68de53331robertphillips@google.com 1284991b8f23482afc1494fd17647421ce68de53331robertphillips@google.com str->append(" dy: "); 1294991b8f23482afc1494fd17647421ce68de53331robertphillips@google.com str->appendScalar(fDy); 1304991b8f23482afc1494fd17647421ce68de53331robertphillips@google.com 1314991b8f23482afc1494fd17647421ce68de53331robertphillips@google.com str->append(" color: "); 1324991b8f23482afc1494fd17647421ce68de53331robertphillips@google.com str->appendHex(fBlurColor); 1334991b8f23482afc1494fd17647421ce68de53331robertphillips@google.com 1344991b8f23482afc1494fd17647421ce68de53331robertphillips@google.com str->append(" flags: ("); 1354991b8f23482afc1494fd17647421ce68de53331robertphillips@google.com if (kNone_BlurFlag == fBlurFlags) { 1364991b8f23482afc1494fd17647421ce68de53331robertphillips@google.com str->append("None"); 1374991b8f23482afc1494fd17647421ce68de53331robertphillips@google.com } else { 1384991b8f23482afc1494fd17647421ce68de53331robertphillips@google.com bool needsSeparator = false; 1394991b8f23482afc1494fd17647421ce68de53331robertphillips@google.com SkAddFlagToString(str, SkToBool(kIgnoreTransform_BlurFlag & fBlurFlags), "IgnoreTransform", 1404991b8f23482afc1494fd17647421ce68de53331robertphillips@google.com &needsSeparator); 1414991b8f23482afc1494fd17647421ce68de53331robertphillips@google.com SkAddFlagToString(str, SkToBool(kOverrideColor_BlurFlag & fBlurFlags), "OverrideColor", 1424991b8f23482afc1494fd17647421ce68de53331robertphillips@google.com &needsSeparator); 1434991b8f23482afc1494fd17647421ce68de53331robertphillips@google.com SkAddFlagToString(str, SkToBool(kHighQuality_BlurFlag & fBlurFlags), "HighQuality", 1444991b8f23482afc1494fd17647421ce68de53331robertphillips@google.com &needsSeparator); 1454991b8f23482afc1494fd17647421ce68de53331robertphillips@google.com } 1464991b8f23482afc1494fd17647421ce68de53331robertphillips@google.com str->append(")"); 1474991b8f23482afc1494fd17647421ce68de53331robertphillips@google.com 1484991b8f23482afc1494fd17647421ce68de53331robertphillips@google.com // TODO: add optional "fBlurFilter->toString(str);" when SkMaskFilter::toString is added 1494991b8f23482afc1494fd17647421ce68de53331robertphillips@google.com // alternatively we could cache the radius in SkBlurDrawLooper and just add it here 1504991b8f23482afc1494fd17647421ce68de53331robertphillips@google.com} 1514991b8f23482afc1494fd17647421ce68de53331robertphillips@google.com#endif 152