SkBlurDrawLooper.cpp revision 54924243c1b65b3ee6d8fa064b50a9b1bb2a19a5
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) 17a728e35edcffd99216e3965a4b908ad0df7f69c2vandebo@chromium.org : fDx(dx), fDy(dy), fBlurColor(color), fBlurFlags(flags), fState(kDone) { 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 6454924243c1b65b3ee6d8fa064b50a9b1bb2a19a5djsollen@google.comvoid SkBlurDrawLooper::flatten(SkFlattenableWriteBuffer& buffer) const { 6554924243c1b65b3ee6d8fa064b50a9b1bb2a19a5djsollen@google.com this->INHERITED::flatten(buffer); 668a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com buffer.writeScalar(fDx); 678a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com buffer.writeScalar(fDy); 688a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com buffer.write32(fBlurColor); 698a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com buffer.writeFlattenable(fBlur); 704868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org buffer.writeFlattenable(fColorFilter); 71038aff623d9fd47946cd31685f74cf473f7c84f0senorblanco@chromium.org buffer.write32(fBlurFlags); 728a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com} 738a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 744e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.comvoid SkBlurDrawLooper::init(SkCanvas* canvas) { 754e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com fState = kBeforeEdge; 768a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com} 778a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 784e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.combool SkBlurDrawLooper::next(SkCanvas* canvas, SkPaint* paint) { 798a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com switch (fState) { 804e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com case kBeforeEdge: 814e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com // we do nothing if a maskfilter is already installed 824e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com if (paint->getMaskFilter()) { 834e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com fState = kDone; 844e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com return false; 854e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com } 8656c69773aea56c6c6bd47bc7e7970dd081205184djsollen@google.com#ifdef SK_BUILD_FOR_ANDROID 87f5dbe2f00f853c6a1719924bdd0c33335a53423adjsollen@google.com SkColor blurColor; 88f5dbe2f00f853c6a1719924bdd0c33335a53423adjsollen@google.com blurColor = fBlurColor; 89f5dbe2f00f853c6a1719924bdd0c33335a53423adjsollen@google.com if (SkColorGetA(blurColor) == 255) { 90f5dbe2f00f853c6a1719924bdd0c33335a53423adjsollen@google.com blurColor = SkColorSetA(blurColor, paint->getAlpha()); 91f5dbe2f00f853c6a1719924bdd0c33335a53423adjsollen@google.com } 92f5dbe2f00f853c6a1719924bdd0c33335a53423adjsollen@google.com paint->setColor(blurColor); 93f5dbe2f00f853c6a1719924bdd0c33335a53423adjsollen@google.com#else 944e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com paint->setColor(fBlurColor); 95f5dbe2f00f853c6a1719924bdd0c33335a53423adjsollen@google.com#endif 964e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com paint->setMaskFilter(fBlur); 974e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com paint->setColorFilter(fColorFilter); 984e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com canvas->save(SkCanvas::kMatrix_SaveFlag); 994e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com if (fBlurFlags & kIgnoreTransform_BlurFlag) { 1004e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com SkMatrix transform(canvas->getTotalMatrix()); 1014e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com transform.postTranslate(fDx, fDy); 1024e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com canvas->setMatrix(transform); 1034e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com } else { 1044e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com canvas->translate(fDx, fDy); 1054e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com } 1064e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com fState = kAfterEdge; 1074e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com return true; 1084e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com case kAfterEdge: 1094e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com canvas->restore(); 1104e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com fState = kDone; 1114e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com return true; 1124e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com default: 1134e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com SkASSERT(kDone == fState); 1144e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com return false; 1158a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com } 1168a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com} 1178a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 1188a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com/////////////////////////////////////////////////////////////////////////////// 1198a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 120d26147adbbdca85f07dff432025afee0c8614387caryclark@google.comSK_DEFINE_FLATTENABLE_REGISTRAR(SkBlurDrawLooper) 1218a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 122