SkBlurDrawLooper.cpp revision 4e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7b
18a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com#include "SkBlurDrawLooper.h" 28a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com#include "SkBlurMaskFilter.h" 38a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com#include "SkCanvas.h" 48a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com#include "SkPaint.h" 58a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com#include "SkMaskFilter.h" 64868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org#include "SkColorFilter.h" 78a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 88a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.comSkBlurDrawLooper::SkBlurDrawLooper(SkScalar radius, SkScalar dx, SkScalar dy, 9038aff623d9fd47946cd31685f74cf473f7c84f0senorblanco@chromium.org SkColor color, uint32_t flags) 104e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com : fDx(dx), fDy(dy), fBlurColor(color), fBlurFlags(flags) { 114e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com 12038aff623d9fd47946cd31685f74cf473f7c84f0senorblanco@chromium.org SkASSERT(flags <= kAll_BlurFlag); 134e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com if (radius > 0) { 1482065d667f64e232bcde2ad849756a6096fcbe6freed@google.com uint32_t blurFlags = flags & kIgnoreTransform_BlurFlag ? 1582065d667f64e232bcde2ad849756a6096fcbe6freed@google.com SkBlurMaskFilter::kIgnoreTransform_BlurFlag : 16038aff623d9fd47946cd31685f74cf473f7c84f0senorblanco@chromium.org SkBlurMaskFilter::kNone_BlurFlag; 17038aff623d9fd47946cd31685f74cf473f7c84f0senorblanco@chromium.org 184868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org blurFlags |= flags & kHighQuality_BlurFlag ? 194868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org SkBlurMaskFilter::kHighQuality_BlurFlag : 204868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org SkBlurMaskFilter::kNone_BlurFlag; 214868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org 228a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com fBlur = SkBlurMaskFilter::Create(radius, 234868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org SkBlurMaskFilter::kNormal_BlurStyle, 24038aff623d9fd47946cd31685f74cf473f7c84f0senorblanco@chromium.org blurFlags); 254e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com } else { 268a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com fBlur = NULL; 274868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org } 284868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org 294e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com if (flags & kOverrideColor_BlurFlag) { 30a6398911174d5445456ecb2f5f4f0565db2f100bjunov@google.com // Set alpha to 1 for the override since transparency will already 31a6398911174d5445456ecb2f5f4f0565db2f100bjunov@google.com // be baked into the blurred mask. 32a6398911174d5445456ecb2f5f4f0565db2f100bjunov@google.com SkColor opaqueColor = SkColorSetA(color, 255); 334868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org //The SrcIn xfer mode will multiply 'color' by the incoming alpha 344e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com fColorFilter = SkColorFilter::CreateModeFilter(opaqueColor, 354e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com SkXfermode::kSrcIn_Mode); 364e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com } else { 374868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org fColorFilter = NULL; 384868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org } 398a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com} 408a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 414e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.comSkBlurDrawLooper::SkBlurDrawLooper(SkFlattenableReadBuffer& buffer) { 428a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com fDx = buffer.readScalar(); 438a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com fDy = buffer.readScalar(); 448a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com fBlurColor = buffer.readU32(); 458a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com fBlur = static_cast<SkMaskFilter*>(buffer.readFlattenable()); 464868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org fColorFilter = static_cast<SkColorFilter*>(buffer.readFlattenable()); 47038aff623d9fd47946cd31685f74cf473f7c84f0senorblanco@chromium.org fBlurFlags = buffer.readU32() & kAll_BlurFlag; 488a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com} 498a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 504e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.comSkBlurDrawLooper::~SkBlurDrawLooper() { 5182065d667f64e232bcde2ad849756a6096fcbe6freed@google.com SkSafeUnref(fBlur); 524868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org SkSafeUnref(fColorFilter); 538a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com} 548a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 554e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.comvoid SkBlurDrawLooper::flatten(SkFlattenableWriteBuffer& buffer) { 568a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com buffer.writeScalar(fDx); 578a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com buffer.writeScalar(fDy); 588a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com buffer.write32(fBlurColor); 598a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com buffer.writeFlattenable(fBlur); 604868e6b221a4a98e40f977851af5fcf09631ea15senorblanco@chromium.org buffer.writeFlattenable(fColorFilter); 61038aff623d9fd47946cd31685f74cf473f7c84f0senorblanco@chromium.org buffer.write32(fBlurFlags); 628a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com} 638a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 644e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.comvoid SkBlurDrawLooper::init(SkCanvas* canvas) { 654e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com fState = kBeforeEdge; 668a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com} 678a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 684e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.combool SkBlurDrawLooper::next(SkCanvas* canvas, SkPaint* paint) { 698a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com switch (fState) { 704e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com case kBeforeEdge: 714e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com // we do nothing if a maskfilter is already installed 724e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com if (paint->getMaskFilter()) { 734e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com fState = kDone; 744e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com return false; 754e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com } 764e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com paint->setColor(fBlurColor); 774e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com paint->setMaskFilter(fBlur); 784e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com paint->setColorFilter(fColorFilter); 794e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com canvas->save(SkCanvas::kMatrix_SaveFlag); 804e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com if (fBlurFlags & kIgnoreTransform_BlurFlag) { 814e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com SkMatrix transform(canvas->getTotalMatrix()); 824e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com transform.postTranslate(fDx, fDy); 834e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com canvas->setMatrix(transform); 844e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com } else { 854e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com canvas->translate(fDx, fDy); 864e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com } 874e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com fState = kAfterEdge; 884e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com return true; 894e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com case kAfterEdge: 904e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com canvas->restore(); 914e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com fState = kDone; 924e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com return true; 934e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com default: 944e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com SkASSERT(kDone == fState); 954e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com return false; 968a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com } 978a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com} 988a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 998a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com/////////////////////////////////////////////////////////////////////////////// 1008a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 1018a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.comstatic SkFlattenable::Registrar gReg("SkBlurDrawLooper", 1028a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com SkBlurDrawLooper::CreateProc); 1038a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 104