SkBlurDrawLooper.cpp revision ec3ed6a5ebf6f2c406d7bcf94b6bc34fcaeb976e
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" 118a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com#include "SkPaint.h" 128a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com#include "SkMaskFilter.h" 134868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org#include "SkColorFilter.h" 148a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 158a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.comSkBlurDrawLooper::SkBlurDrawLooper(SkScalar radius, SkScalar dx, SkScalar dy, 16038aff623d9fd47946cd31685f74cf473f7c84f0senorblanco@chromium.org SkColor color, uint32_t flags) 174e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com : fDx(dx), fDy(dy), fBlurColor(color), fBlurFlags(flags) { 184e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com 19038aff623d9fd47946cd31685f74cf473f7c84f0senorblanco@chromium.org SkASSERT(flags <= kAll_BlurFlag); 204e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com if (radius > 0) { 2182065d667f64e232bcde2ad849756a6096fcbe6freed@google.com uint32_t blurFlags = flags & kIgnoreTransform_BlurFlag ? 2282065d667f64e232bcde2ad849756a6096fcbe6freed@google.com SkBlurMaskFilter::kIgnoreTransform_BlurFlag : 23038aff623d9fd47946cd31685f74cf473f7c84f0senorblanco@chromium.org SkBlurMaskFilter::kNone_BlurFlag; 24038aff623d9fd47946cd31685f74cf473f7c84f0senorblanco@chromium.org 254868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org blurFlags |= flags & kHighQuality_BlurFlag ? 264868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org SkBlurMaskFilter::kHighQuality_BlurFlag : 274868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org SkBlurMaskFilter::kNone_BlurFlag; 284868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org 298a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com fBlur = SkBlurMaskFilter::Create(radius, 304868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org SkBlurMaskFilter::kNormal_BlurStyle, 31038aff623d9fd47946cd31685f74cf473f7c84f0senorblanco@chromium.org blurFlags); 324e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com } else { 338a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com fBlur = NULL; 344868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org } 354868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org 364e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com if (flags & kOverrideColor_BlurFlag) { 37a6398911174d5445456ecb2f5f4f0565db2f100bjunov@google.com // Set alpha to 1 for the override since transparency will already 38a6398911174d5445456ecb2f5f4f0565db2f100bjunov@google.com // be baked into the blurred mask. 39a6398911174d5445456ecb2f5f4f0565db2f100bjunov@google.com SkColor opaqueColor = SkColorSetA(color, 255); 404868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org //The SrcIn xfer mode will multiply 'color' by the incoming alpha 414e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com fColorFilter = SkColorFilter::CreateModeFilter(opaqueColor, 424e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com SkXfermode::kSrcIn_Mode); 434e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com } else { 444868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org fColorFilter = NULL; 454868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org } 468a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com} 478a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 486bac947cd5bc460dd9166ada6310d678fd2e39f8reed@google.comSkBlurDrawLooper::SkBlurDrawLooper(SkFlattenableReadBuffer& buffer) 496bac947cd5bc460dd9166ada6310d678fd2e39f8reed@google.com: INHERITED(buffer) { 506bac947cd5bc460dd9166ada6310d678fd2e39f8reed@google.com 518a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com fDx = buffer.readScalar(); 528a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com fDy = buffer.readScalar(); 538a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com fBlurColor = buffer.readU32(); 548a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com fBlur = static_cast<SkMaskFilter*>(buffer.readFlattenable()); 554868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org fColorFilter = static_cast<SkColorFilter*>(buffer.readFlattenable()); 56038aff623d9fd47946cd31685f74cf473f7c84f0senorblanco@chromium.org fBlurFlags = buffer.readU32() & kAll_BlurFlag; 578a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com} 588a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 594e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.comSkBlurDrawLooper::~SkBlurDrawLooper() { 6082065d667f64e232bcde2ad849756a6096fcbe6freed@google.com SkSafeUnref(fBlur); 614868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org SkSafeUnref(fColorFilter); 628a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com} 638a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 644e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.comvoid SkBlurDrawLooper::flatten(SkFlattenableWriteBuffer& buffer) { 658a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com buffer.writeScalar(fDx); 668a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com buffer.writeScalar(fDy); 678a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com buffer.write32(fBlurColor); 688a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com buffer.writeFlattenable(fBlur); 694868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org buffer.writeFlattenable(fColorFilter); 70038aff623d9fd47946cd31685f74cf473f7c84f0senorblanco@chromium.org buffer.write32(fBlurFlags); 718a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com} 728a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 734e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.comvoid SkBlurDrawLooper::init(SkCanvas* canvas) { 744e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com fState = kBeforeEdge; 758a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com} 768a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 774e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.combool SkBlurDrawLooper::next(SkCanvas* canvas, SkPaint* paint) { 788a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com switch (fState) { 794e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com case kBeforeEdge: 804e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com // we do nothing if a maskfilter is already installed 814e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com if (paint->getMaskFilter()) { 824e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com fState = kDone; 834e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com return false; 844e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com } 85f5dbe2f00f853c6a1719924bdd0c33335a53423adjsollen@google.com#ifdef ANDROID 86f5dbe2f00f853c6a1719924bdd0c33335a53423adjsollen@google.com SkColor blurColor; 87f5dbe2f00f853c6a1719924bdd0c33335a53423adjsollen@google.com blurColor = fBlurColor; 88f5dbe2f00f853c6a1719924bdd0c33335a53423adjsollen@google.com if (SkColorGetA(blurColor) == 255) { 89f5dbe2f00f853c6a1719924bdd0c33335a53423adjsollen@google.com blurColor = SkColorSetA(blurColor, paint->getAlpha()); 90f5dbe2f00f853c6a1719924bdd0c33335a53423adjsollen@google.com } 91f5dbe2f00f853c6a1719924bdd0c33335a53423adjsollen@google.com paint->setColor(blurColor); 92f5dbe2f00f853c6a1719924bdd0c33335a53423adjsollen@google.com#else 934e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com paint->setColor(fBlurColor); 94f5dbe2f00f853c6a1719924bdd0c33335a53423adjsollen@google.com#endif 954e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com paint->setMaskFilter(fBlur); 964e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com paint->setColorFilter(fColorFilter); 974e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com canvas->save(SkCanvas::kMatrix_SaveFlag); 984e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com if (fBlurFlags & kIgnoreTransform_BlurFlag) { 994e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com SkMatrix transform(canvas->getTotalMatrix()); 1004e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com transform.postTranslate(fDx, fDy); 1014e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com canvas->setMatrix(transform); 1024e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com } else { 1034e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com canvas->translate(fDx, fDy); 1044e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com } 1054e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com fState = kAfterEdge; 1064e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com return true; 1074e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com case kAfterEdge: 1084e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com canvas->restore(); 1094e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com fState = kDone; 1104e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com return true; 1114e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com default: 1124e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com SkASSERT(kDone == fState); 1134e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com return false; 1148a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com } 1158a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com} 1168a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 1178a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com/////////////////////////////////////////////////////////////////////////////// 1188a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 1198a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.comstatic SkFlattenable::Registrar gReg("SkBlurDrawLooper", 1208a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com SkBlurDrawLooper::CreateProc); 1218a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 122