diff -r 000000000000 -r 6474c204b198 gfx/skia/trunk/src/core/SkCanvas.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/gfx/skia/trunk/src/core/SkCanvas.cpp Wed Dec 31 06:09:35 2014 +0100 @@ -0,0 +1,2583 @@ + +/* + * Copyright 2008 The Android Open Source Project + * + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE file. + */ + + +#include "SkCanvas.h" +#include "SkBitmapDevice.h" +#include "SkBounder.h" +#include "SkDeviceImageFilterProxy.h" +#include "SkDraw.h" +#include "SkDrawFilter.h" +#include "SkDrawLooper.h" +#include "SkMetaData.h" +#include "SkPathOps.h" +#include "SkPicture.h" +#include "SkRasterClip.h" +#include "SkRRect.h" +#include "SkSmallAllocator.h" +#include "SkSurface_Base.h" +#include "SkTemplates.h" +#include "SkTextFormatParams.h" +#include "SkTLazy.h" +#include "SkUtils.h" + +#if SK_SUPPORT_GPU +#include "GrRenderTarget.h" +#endif + +// experimental for faster tiled drawing... +//#define SK_ENABLE_CLIP_QUICKREJECT + +//#define SK_TRACE_SAVERESTORE + +#ifdef SK_TRACE_SAVERESTORE + static int gLayerCounter; + static void inc_layer() { ++gLayerCounter; printf("----- inc layer %d\n", gLayerCounter); } + static void dec_layer() { --gLayerCounter; printf("----- dec layer %d\n", gLayerCounter); } + + static int gRecCounter; + static void inc_rec() { ++gRecCounter; printf("----- inc rec %d\n", gRecCounter); } + static void dec_rec() { --gRecCounter; printf("----- dec rec %d\n", gRecCounter); } + + static int gCanvasCounter; + static void inc_canvas() { ++gCanvasCounter; printf("----- inc canvas %d\n", gCanvasCounter); } + static void dec_canvas() { --gCanvasCounter; printf("----- dec canvas %d\n", gCanvasCounter); } +#else + #define inc_layer() + #define dec_layer() + #define inc_rec() + #define dec_rec() + #define inc_canvas() + #define dec_canvas() +#endif + +#ifdef SK_DEBUG +#include "SkPixelRef.h" + +/* + * Some pixelref subclasses can support being "locked" from another thread + * during the lock-scope of skia calling them. In these instances, this balance + * check will fail, but may not be indicative of a problem, so we allow a build + * flag to disable this check. + * + * Potentially another fix would be to have a (debug-only) virtual or flag on + * pixelref, which could tell us at runtime if this check is valid. That would + * eliminate the need for this heavy-handed build check. + */ +#ifdef SK_DISABLE_PIXELREF_LOCKCOUNT_BALANCE_CHECK +class AutoCheckLockCountBalance { +public: + AutoCheckLockCountBalance(const SkBitmap&) { /* do nothing */ } +}; +#else +class AutoCheckLockCountBalance { +public: + AutoCheckLockCountBalance(const SkBitmap& bm) : fPixelRef(bm.pixelRef()) { + fLockCount = fPixelRef ? fPixelRef->getLockCount() : 0; + } + ~AutoCheckLockCountBalance() { + const int count = fPixelRef ? fPixelRef->getLockCount() : 0; + SkASSERT(count == fLockCount); + } + +private: + const SkPixelRef* fPixelRef; + int fLockCount; +}; +#endif + +class AutoCheckNoSetContext { +public: + AutoCheckNoSetContext(const SkPaint& paint) : fPaint(paint) { + this->assertNoSetContext(fPaint); + } + ~AutoCheckNoSetContext() { + this->assertNoSetContext(fPaint); + } + +private: + const SkPaint& fPaint; + + void assertNoSetContext(const SkPaint& paint) { + SkShader* s = paint.getShader(); + if (s) { + SkASSERT(!s->setContextHasBeenCalled()); + } + } +}; + +#define CHECK_LOCKCOUNT_BALANCE(bitmap) AutoCheckLockCountBalance clcb(bitmap) +#define CHECK_SHADER_NOSETCONTEXT(paint) AutoCheckNoSetContext cshsc(paint) + +#else + #define CHECK_LOCKCOUNT_BALANCE(bitmap) + #define CHECK_SHADER_NOSETCONTEXT(paint) +#endif + +typedef SkTLazy SkLazyPaint; + +void SkCanvas::predrawNotify() { + if (fSurfaceBase) { + fSurfaceBase->aboutToDraw(SkSurface::kRetain_ContentChangeMode); + } +} + +/////////////////////////////////////////////////////////////////////////////// + +/* This is the record we keep for each SkBaseDevice that the user installs. + The clip/matrix/proc are fields that reflect the top of the save/restore + stack. Whenever the canvas changes, it marks a dirty flag, and then before + these are used (assuming we're not on a layer) we rebuild these cache + values: they reflect the top of the save stack, but translated and clipped + by the device's XY offset and bitmap-bounds. +*/ +struct DeviceCM { + DeviceCM* fNext; + SkBaseDevice* fDevice; + SkRasterClip fClip; + const SkMatrix* fMatrix; + SkPaint* fPaint; // may be null (in the future) + + DeviceCM(SkBaseDevice* device, int x, int y, const SkPaint* paint, SkCanvas* canvas) + : fNext(NULL) { + if (NULL != device) { + device->ref(); + device->onAttachToCanvas(canvas); + } + fDevice = device; + fPaint = paint ? SkNEW_ARGS(SkPaint, (*paint)) : NULL; + } + + ~DeviceCM() { + if (NULL != fDevice) { + fDevice->onDetachFromCanvas(); + fDevice->unref(); + } + SkDELETE(fPaint); + } + + void updateMC(const SkMatrix& totalMatrix, const SkRasterClip& totalClip, + const SkClipStack& clipStack, SkRasterClip* updateClip) { + int x = fDevice->getOrigin().x(); + int y = fDevice->getOrigin().y(); + int width = fDevice->width(); + int height = fDevice->height(); + + if ((x | y) == 0) { + fMatrix = &totalMatrix; + fClip = totalClip; + } else { + fMatrixStorage = totalMatrix; + fMatrixStorage.postTranslate(SkIntToScalar(-x), + SkIntToScalar(-y)); + fMatrix = &fMatrixStorage; + + totalClip.translate(-x, -y, &fClip); + } + + fClip.op(SkIRect::MakeWH(width, height), SkRegion::kIntersect_Op); + + // intersect clip, but don't translate it (yet) + + if (updateClip) { + updateClip->op(SkIRect::MakeXYWH(x, y, width, height), + SkRegion::kDifference_Op); + } + + fDevice->setMatrixClip(*fMatrix, fClip.forceGetBW(), clipStack); + +#ifdef SK_DEBUG + if (!fClip.isEmpty()) { + SkIRect deviceR; + deviceR.set(0, 0, width, height); + SkASSERT(deviceR.contains(fClip.getBounds())); + } +#endif + } + +private: + SkMatrix fMatrixStorage; +}; + +/* This is the record we keep for each save/restore level in the stack. + Since a level optionally copies the matrix and/or stack, we have pointers + for these fields. If the value is copied for this level, the copy is + stored in the ...Storage field, and the pointer points to that. If the + value is not copied for this level, we ignore ...Storage, and just point + at the corresponding value in the previous level in the stack. +*/ +class SkCanvas::MCRec { +public: + int fFlags; + SkMatrix* fMatrix; // points to either fMatrixStorage or prev MCRec + SkRasterClip* fRasterClip; // points to either fRegionStorage or prev MCRec + SkDrawFilter* fFilter; // the current filter (or null) + + DeviceCM* fLayer; + /* If there are any layers in the stack, this points to the top-most + one that is at or below this level in the stack (so we know what + bitmap/device to draw into from this level. This value is NOT + reference counted, since the real owner is either our fLayer field, + or a previous one in a lower level.) + */ + DeviceCM* fTopLayer; + + MCRec(const MCRec* prev, int flags) : fFlags(flags) { + if (NULL != prev) { + if (flags & SkCanvas::kMatrix_SaveFlag) { + fMatrixStorage = *prev->fMatrix; + fMatrix = &fMatrixStorage; + } else { + fMatrix = prev->fMatrix; + } + + if (flags & SkCanvas::kClip_SaveFlag) { + fRasterClipStorage = *prev->fRasterClip; + fRasterClip = &fRasterClipStorage; + } else { + fRasterClip = prev->fRasterClip; + } + + fFilter = prev->fFilter; + SkSafeRef(fFilter); + + fTopLayer = prev->fTopLayer; + } else { // no prev + fMatrixStorage.reset(); + + fMatrix = &fMatrixStorage; + fRasterClip = &fRasterClipStorage; + fFilter = NULL; + fTopLayer = NULL; + } + fLayer = NULL; + + // don't bother initializing fNext + inc_rec(); + } + ~MCRec() { + SkSafeUnref(fFilter); + SkDELETE(fLayer); + dec_rec(); + } + +private: + SkMatrix fMatrixStorage; + SkRasterClip fRasterClipStorage; +}; + +class SkDrawIter : public SkDraw { +public: + SkDrawIter(SkCanvas* canvas, bool skipEmptyClips = true) { + canvas = canvas->canvasForDrawIter(); + fCanvas = canvas; + canvas->updateDeviceCMCache(); + + fClipStack = &canvas->fClipStack; + fBounder = canvas->getBounder(); + fCurrLayer = canvas->fMCRec->fTopLayer; + fSkipEmptyClips = skipEmptyClips; + } + + bool next() { + // skip over recs with empty clips + if (fSkipEmptyClips) { + while (fCurrLayer && fCurrLayer->fClip.isEmpty()) { + fCurrLayer = fCurrLayer->fNext; + } + } + + const DeviceCM* rec = fCurrLayer; + if (rec && rec->fDevice) { + + fMatrix = rec->fMatrix; + fClip = &((SkRasterClip*)&rec->fClip)->forceGetBW(); + fRC = &rec->fClip; + fDevice = rec->fDevice; + fBitmap = &fDevice->accessBitmap(true); + fPaint = rec->fPaint; + SkDEBUGCODE(this->validate();) + + fCurrLayer = rec->fNext; + if (fBounder) { + fBounder->setClip(fClip); + } + // fCurrLayer may be NULL now + + return true; + } + return false; + } + + SkBaseDevice* getDevice() const { return fDevice; } + int getX() const { return fDevice->getOrigin().x(); } + int getY() const { return fDevice->getOrigin().y(); } + const SkMatrix& getMatrix() const { return *fMatrix; } + const SkRegion& getClip() const { return *fClip; } + const SkPaint* getPaint() const { return fPaint; } + +private: + SkCanvas* fCanvas; + const DeviceCM* fCurrLayer; + const SkPaint* fPaint; // May be null. + SkBool8 fSkipEmptyClips; + + typedef SkDraw INHERITED; +}; + +///////////////////////////////////////////////////////////////////////////// + +class AutoDrawLooper { +public: + AutoDrawLooper(SkCanvas* canvas, const SkPaint& paint, + bool skipLayerForImageFilter = false, + const SkRect* bounds = NULL) : fOrigPaint(paint) { + fCanvas = canvas; + fFilter = canvas->getDrawFilter(); + fPaint = NULL; + fSaveCount = canvas->getSaveCount(); + fDoClearImageFilter = false; + fDone = false; + + if (!skipLayerForImageFilter && fOrigPaint.getImageFilter()) { + SkPaint tmp; + tmp.setImageFilter(fOrigPaint.getImageFilter()); + (void)canvas->internalSaveLayer(bounds, &tmp, SkCanvas::kARGB_ClipLayer_SaveFlag, + true, SkCanvas::kFullLayer_SaveLayerStrategy); + // we'll clear the imageFilter for the actual draws in next(), so + // it will only be applied during the restore(). + fDoClearImageFilter = true; + } + + if (SkDrawLooper* looper = paint.getLooper()) { + void* buffer = fLooperContextAllocator.reserveT( + looper->contextSize()); + fLooperContext = looper->createContext(canvas, buffer); + fIsSimple = false; + } else { + fLooperContext = NULL; + // can we be marked as simple? + fIsSimple = !fFilter && !fDoClearImageFilter; + } + } + + ~AutoDrawLooper() { + if (fDoClearImageFilter) { + fCanvas->internalRestore(); + } + SkASSERT(fCanvas->getSaveCount() == fSaveCount); + } + + const SkPaint& paint() const { + SkASSERT(fPaint); + return *fPaint; + } + + bool next(SkDrawFilter::Type drawType) { + if (fDone) { + return false; + } else if (fIsSimple) { + fDone = true; + fPaint = &fOrigPaint; + return !fPaint->nothingToDraw(); + } else { + return this->doNext(drawType); + } + } + +private: + SkLazyPaint fLazyPaint; + SkCanvas* fCanvas; + const SkPaint& fOrigPaint; + SkDrawFilter* fFilter; + const SkPaint* fPaint; + int fSaveCount; + bool fDoClearImageFilter; + bool fDone; + bool fIsSimple; + SkDrawLooper::Context* fLooperContext; + SkSmallAllocator<1, 32> fLooperContextAllocator; + + bool doNext(SkDrawFilter::Type drawType); +}; + +bool AutoDrawLooper::doNext(SkDrawFilter::Type drawType) { + fPaint = NULL; + SkASSERT(!fIsSimple); + SkASSERT(fLooperContext || fFilter || fDoClearImageFilter); + + SkPaint* paint = fLazyPaint.set(fOrigPaint); + + if (fDoClearImageFilter) { + paint->setImageFilter(NULL); + } + + if (fLooperContext && !fLooperContext->next(fCanvas, paint)) { + fDone = true; + return false; + } + if (fFilter) { + if (!fFilter->filter(paint, drawType)) { + fDone = true; + return false; + } + if (NULL == fLooperContext) { + // no looper means we only draw once + fDone = true; + } + } + fPaint = paint; + + // if we only came in here for the imagefilter, mark us as done + if (!fLooperContext && !fFilter) { + fDone = true; + } + + // call this after any possible paint modifiers + if (fPaint->nothingToDraw()) { + fPaint = NULL; + return false; + } + return true; +} + +/* Stack helper for managing a SkBounder. In the destructor, if we were + given a bounder, we call its commit() method, signifying that we are + done accumulating bounds for that draw. +*/ +class SkAutoBounderCommit { +public: + SkAutoBounderCommit(SkBounder* bounder) : fBounder(bounder) {} + ~SkAutoBounderCommit() { + if (NULL != fBounder) { + fBounder->commit(); + } + } +private: + SkBounder* fBounder; +}; +#define SkAutoBounderCommit(...) SK_REQUIRE_LOCAL_VAR(SkAutoBounderCommit) + +#include "SkColorPriv.h" + +////////// macros to place around the internal draw calls ////////////////// + +#define LOOPER_BEGIN_DRAWDEVICE(paint, type) \ + this->predrawNotify(); \ + AutoDrawLooper looper(this, paint, true); \ + while (looper.next(type)) { \ + SkAutoBounderCommit ac(fBounder); \ + SkDrawIter iter(this); + +#define LOOPER_BEGIN(paint, type, bounds) \ + this->predrawNotify(); \ + AutoDrawLooper looper(this, paint, false, bounds); \ + while (looper.next(type)) { \ + SkAutoBounderCommit ac(fBounder); \ + SkDrawIter iter(this); + +#define LOOPER_END } + +//////////////////////////////////////////////////////////////////////////// + +SkBaseDevice* SkCanvas::init(SkBaseDevice* device) { + fBounder = NULL; + fCachedLocalClipBounds.setEmpty(); + fCachedLocalClipBoundsDirty = true; + fAllowSoftClip = true; + fAllowSimplifyClip = false; + fDeviceCMDirty = false; + fSaveLayerCount = 0; + fCullCount = 0; + fMetaData = NULL; + + fMCRec = (MCRec*)fMCStack.push_back(); + new (fMCRec) MCRec(NULL, 0); + + fMCRec->fLayer = SkNEW_ARGS(DeviceCM, (NULL, 0, 0, NULL, NULL)); + fMCRec->fTopLayer = fMCRec->fLayer; + + fSurfaceBase = NULL; + + return this->setRootDevice(device); +} + +SkCanvas::SkCanvas() + : fMCStack(sizeof(MCRec), fMCRecStorage, sizeof(fMCRecStorage)) +{ + inc_canvas(); + + this->init(NULL); +} + +SkCanvas::SkCanvas(int width, int height) + : fMCStack(sizeof(MCRec), fMCRecStorage, sizeof(fMCRecStorage)) +{ + inc_canvas(); + + SkBitmap bitmap; + bitmap.setConfig(SkImageInfo::MakeUnknown(width, height)); + this->init(SkNEW_ARGS(SkBitmapDevice, (bitmap)))->unref(); +} + +SkCanvas::SkCanvas(SkBaseDevice* device) + : fMCStack(sizeof(MCRec), fMCRecStorage, sizeof(fMCRecStorage)) +{ + inc_canvas(); + + this->init(device); +} + +SkCanvas::SkCanvas(const SkBitmap& bitmap) + : fMCStack(sizeof(MCRec), fMCRecStorage, sizeof(fMCRecStorage)) +{ + inc_canvas(); + + this->init(SkNEW_ARGS(SkBitmapDevice, (bitmap)))->unref(); +} + +SkCanvas::~SkCanvas() { + // free up the contents of our deque + this->restoreToCount(1); // restore everything but the last + SkASSERT(0 == fSaveLayerCount); + + this->internalRestore(); // restore the last, since we're going away + + SkSafeUnref(fBounder); + SkDELETE(fMetaData); + + dec_canvas(); +} + +SkBounder* SkCanvas::setBounder(SkBounder* bounder) { + SkRefCnt_SafeAssign(fBounder, bounder); + return bounder; +} + +SkDrawFilter* SkCanvas::getDrawFilter() const { + return fMCRec->fFilter; +} + +SkDrawFilter* SkCanvas::setDrawFilter(SkDrawFilter* filter) { + SkRefCnt_SafeAssign(fMCRec->fFilter, filter); + return filter; +} + +SkMetaData& SkCanvas::getMetaData() { + // metadata users are rare, so we lazily allocate it. If that changes we + // can decide to just make it a field in the device (rather than a ptr) + if (NULL == fMetaData) { + fMetaData = new SkMetaData; + } + return *fMetaData; +} + +/////////////////////////////////////////////////////////////////////////////// + +void SkCanvas::flush() { + SkBaseDevice* device = this->getDevice(); + if (device) { + device->flush(); + } +} + +SkISize SkCanvas::getTopLayerSize() const { + SkBaseDevice* d = this->getTopDevice(); + return d ? SkISize::Make(d->width(), d->height()) : SkISize::Make(0, 0); +} + +SkIPoint SkCanvas::getTopLayerOrigin() const { + SkBaseDevice* d = this->getTopDevice(); + return d ? d->getOrigin() : SkIPoint::Make(0, 0); +} + +SkISize SkCanvas::getBaseLayerSize() const { + SkBaseDevice* d = this->getDevice(); + return d ? SkISize::Make(d->width(), d->height()) : SkISize::Make(0, 0); +} + +SkBaseDevice* SkCanvas::getDevice() const { + // return root device + MCRec* rec = (MCRec*) fMCStack.front(); + SkASSERT(rec && rec->fLayer); + return rec->fLayer->fDevice; +} + +SkBaseDevice* SkCanvas::getTopDevice(bool updateMatrixClip) const { + if (updateMatrixClip) { + const_cast(this)->updateDeviceCMCache(); + } + return fMCRec->fTopLayer->fDevice; +} + +SkBaseDevice* SkCanvas::setRootDevice(SkBaseDevice* device) { + // return root device + SkDeque::F2BIter iter(fMCStack); + MCRec* rec = (MCRec*)iter.next(); + SkASSERT(rec && rec->fLayer); + SkBaseDevice* rootDevice = rec->fLayer->fDevice; + + if (rootDevice == device) { + return device; + } + + if (device) { + device->onAttachToCanvas(this); + } + if (rootDevice) { + rootDevice->onDetachFromCanvas(); + } + + SkRefCnt_SafeAssign(rec->fLayer->fDevice, device); + rootDevice = device; + + fDeviceCMDirty = true; + + /* Now we update our initial region to have the bounds of the new device, + and then intersect all of the clips in our stack with these bounds, + to ensure that we can't draw outside of the device's bounds (and trash + memory). + + NOTE: this is only a partial-fix, since if the new device is larger than + the previous one, we don't know how to "enlarge" the clips in our stack, + so drawing may be artificially restricted. Without keeping a history of + all calls to canvas->clipRect() and canvas->clipPath(), we can't exactly + reconstruct the correct clips, so this approximation will have to do. + The caller really needs to restore() back to the base if they want to + accurately take advantage of the new device bounds. + */ + + SkIRect bounds; + if (device) { + bounds.set(0, 0, device->width(), device->height()); + } else { + bounds.setEmpty(); + } + // now jam our 1st clip to be bounds, and intersect the rest with that + rec->fRasterClip->setRect(bounds); + while ((rec = (MCRec*)iter.next()) != NULL) { + (void)rec->fRasterClip->op(bounds, SkRegion::kIntersect_Op); + } + + return device; +} + +bool SkCanvas::readPixels(SkBitmap* bitmap, + int x, int y, + Config8888 config8888) { + SkBaseDevice* device = this->getDevice(); + if (!device) { + return false; + } + return device->readPixels(bitmap, x, y, config8888); +} + +bool SkCanvas::readPixels(const SkIRect& srcRect, SkBitmap* bitmap) { + SkBaseDevice* device = this->getDevice(); + if (!device) { + return false; + } + + SkIRect bounds; + bounds.set(0, 0, device->width(), device->height()); + if (!bounds.intersect(srcRect)) { + return false; + } + + SkBitmap tmp; + tmp.setConfig(SkBitmap::kARGB_8888_Config, bounds.width(), + bounds.height()); + if (this->readPixels(&tmp, bounds.fLeft, bounds.fTop)) { + bitmap->swap(tmp); + return true; + } else { + return false; + } +} + +#ifdef SK_SUPPORT_LEGACY_WRITEPIXELSCONFIG +void SkCanvas::writePixels(const SkBitmap& bitmap, int x, int y, + Config8888 config8888) { + SkBaseDevice* device = this->getDevice(); + if (device) { + if (SkIRect::Intersects(SkIRect::MakeSize(this->getDeviceSize()), + SkIRect::MakeXYWH(x, y, bitmap.width(), bitmap.height()))) { + device->accessBitmap(true); + device->writePixels(bitmap, x, y, config8888); + } + } +} +#endif + +bool SkCanvas::writePixels(const SkBitmap& bitmap, int x, int y) { + if (bitmap.getTexture()) { + return false; + } + SkBitmap bm(bitmap); + bm.lockPixels(); + if (bm.getPixels()) { + return this->writePixels(bm.info(), bm.getPixels(), bm.rowBytes(), x, y); + } + return false; +} + +bool SkCanvas::writePixels(const SkImageInfo& origInfo, const void* pixels, size_t rowBytes, + int x, int y) { + switch (origInfo.colorType()) { + case kUnknown_SkColorType: + case kIndex_8_SkColorType: + return false; + default: + break; + } + if (NULL == pixels || rowBytes < origInfo.minRowBytes()) { + return false; + } + + const SkISize size = this->getBaseLayerSize(); + SkIRect target = SkIRect::MakeXYWH(x, y, origInfo.width(), origInfo.height()); + if (!target.intersect(0, 0, size.width(), size.height())) { + return false; + } + + SkBaseDevice* device = this->getDevice(); + if (!device) { + return false; + } + + SkImageInfo info = origInfo; + // the intersect may have shrunk info's logical size + info.fWidth = target.width(); + info.fHeight = target.height(); + + // if x or y are negative, then we have to adjust pixels + if (x > 0) { + x = 0; + } + if (y > 0) { + y = 0; + } + // here x,y are either 0 or negative + pixels = ((const char*)pixels - y * rowBytes - x * info.bytesPerPixel()); + + // The device can assert that the requested area is always contained in its bounds + return device->writePixelsDirect(info, pixels, rowBytes, target.x(), target.y()); +} + +SkCanvas* SkCanvas::canvasForDrawIter() { + return this; +} + +////////////////////////////////////////////////////////////////////////////// + +void SkCanvas::updateDeviceCMCache() { + if (fDeviceCMDirty) { + const SkMatrix& totalMatrix = this->getTotalMatrix(); + const SkRasterClip& totalClip = *fMCRec->fRasterClip; + DeviceCM* layer = fMCRec->fTopLayer; + + if (NULL == layer->fNext) { // only one layer + layer->updateMC(totalMatrix, totalClip, fClipStack, NULL); + } else { + SkRasterClip clip(totalClip); + do { + layer->updateMC(totalMatrix, clip, fClipStack, &clip); + } while ((layer = layer->fNext) != NULL); + } + fDeviceCMDirty = false; + } +} + +/////////////////////////////////////////////////////////////////////////////// + +int SkCanvas::internalSave(SaveFlags flags) { + int saveCount = this->getSaveCount(); // record this before the actual save + + MCRec* newTop = (MCRec*)fMCStack.push_back(); + new (newTop) MCRec(fMCRec, flags); // balanced in restore() + + fMCRec = newTop; + + if (SkCanvas::kClip_SaveFlag & flags) { + fClipStack.save(); + } + + return saveCount; +} + +void SkCanvas::willSave(SaveFlags) { + // Do nothing. Subclasses may do something. +} + +int SkCanvas::save(SaveFlags flags) { + this->willSave(flags); + // call shared impl + return this->internalSave(flags); +} + +static bool bounds_affects_clip(SkCanvas::SaveFlags flags) { +#ifdef SK_SUPPORT_LEGACY_CLIPTOLAYERFLAG + return (flags & SkCanvas::kClipToLayer_SaveFlag) != 0; +#else + return true; +#endif +} + +bool SkCanvas::clipRectBounds(const SkRect* bounds, SaveFlags flags, + SkIRect* intersection, const SkImageFilter* imageFilter) { + SkIRect clipBounds; + SkRegion::Op op = SkRegion::kIntersect_Op; + if (!this->getClipDeviceBounds(&clipBounds)) { + return false; + } + + if (imageFilter) { + imageFilter->filterBounds(clipBounds, *fMCRec->fMatrix, &clipBounds); + // Filters may grow the bounds beyond the device bounds. + op = SkRegion::kReplace_Op; + } + SkIRect ir; + if (NULL != bounds) { + SkRect r; + + this->getTotalMatrix().mapRect(&r, *bounds); + r.roundOut(&ir); + // early exit if the layer's bounds are clipped out + if (!ir.intersect(clipBounds)) { + if (bounds_affects_clip(flags)) { + fMCRec->fRasterClip->setEmpty(); + } + return false; + } + } else { // no user bounds, so just use the clip + ir = clipBounds; + } + + if (bounds_affects_clip(flags)) { + fClipStack.clipDevRect(ir, op); + // early exit if the clip is now empty + if (!fMCRec->fRasterClip->op(ir, op)) { + return false; + } + } + + if (intersection) { + *intersection = ir; + } + return true; +} + +SkCanvas::SaveLayerStrategy SkCanvas::willSaveLayer(const SkRect*, const SkPaint*, SaveFlags) { + + // Do nothing. Subclasses may do something. + return kFullLayer_SaveLayerStrategy; +} + +int SkCanvas::saveLayer(const SkRect* bounds, const SkPaint* paint, + SaveFlags flags) { + // Overriding classes may return false to signal that we don't need to create a layer. + SaveLayerStrategy strategy = this->willSaveLayer(bounds, paint, flags); + return this->internalSaveLayer(bounds, paint, flags, false, strategy); +} + +static SkBaseDevice* createCompatibleDevice(SkCanvas* canvas, + const SkImageInfo& info) { + SkBaseDevice* device = canvas->getDevice(); + return device ? device->createCompatibleDevice(info) : NULL; +} + +int SkCanvas::internalSaveLayer(const SkRect* bounds, const SkPaint* paint, SaveFlags flags, + bool justForImageFilter, SaveLayerStrategy strategy) { +#ifndef SK_SUPPORT_LEGACY_CLIPTOLAYERFLAG + flags = (SaveFlags)(flags | kClipToLayer_SaveFlag); +#endif + + // do this before we create the layer. We don't call the public save() since + // that would invoke a possibly overridden virtual + int count = this->internalSave(flags); + + fDeviceCMDirty = true; + + SkIRect ir; + if (!this->clipRectBounds(bounds, flags, &ir, paint ? paint->getImageFilter() : NULL)) { + return count; + } + + // FIXME: do willSaveLayer() overriders returning kNoLayer_SaveLayerStrategy really care about + // the clipRectBounds() call above? + if (kNoLayer_SaveLayerStrategy == strategy) { + return count; + } + + // Kill the imagefilter if our device doesn't allow it + SkLazyPaint lazyP; + if (paint && paint->getImageFilter()) { + if (!this->getTopDevice()->allowImageFilter(paint->getImageFilter())) { + if (justForImageFilter) { + // early exit if the layer was just for the imageFilter + return count; + } + SkPaint* p = lazyP.set(*paint); + p->setImageFilter(NULL); + paint = p; + } + } + + bool isOpaque = !SkToBool(flags & kHasAlphaLayer_SaveFlag); + SkImageInfo info = SkImageInfo::MakeN32(ir.width(), ir.height(), + isOpaque ? kOpaque_SkAlphaType : kPremul_SkAlphaType); + + SkBaseDevice* device; + if (paint && paint->getImageFilter()) { + device = createCompatibleDevice(this, info); + } else { + device = this->createLayerDevice(info); + } + if (NULL == device) { + SkDebugf("Unable to create device for layer."); + return count; + } + + device->setOrigin(ir.fLeft, ir.fTop); + DeviceCM* layer = SkNEW_ARGS(DeviceCM, (device, ir.fLeft, ir.fTop, paint, this)); + device->unref(); + + layer->fNext = fMCRec->fTopLayer; + fMCRec->fLayer = layer; + fMCRec->fTopLayer = layer; // this field is NOT an owner of layer + + fSaveLayerCount += 1; + return count; +} + +int SkCanvas::saveLayerAlpha(const SkRect* bounds, U8CPU alpha, + SaveFlags flags) { + if (0xFF == alpha) { + return this->saveLayer(bounds, NULL, flags); + } else { + SkPaint tmpPaint; + tmpPaint.setAlpha(alpha); + return this->saveLayer(bounds, &tmpPaint, flags); + } +} + +void SkCanvas::willRestore() { + // Do nothing. Subclasses may do something. +} + +void SkCanvas::restore() { + // check for underflow + if (fMCStack.count() > 1) { + this->willRestore(); + this->internalRestore(); + } +} + +void SkCanvas::internalRestore() { + SkASSERT(fMCStack.count() != 0); + + fDeviceCMDirty = true; + fCachedLocalClipBoundsDirty = true; + + if (SkCanvas::kClip_SaveFlag & fMCRec->fFlags) { + fClipStack.restore(); + } + + // reserve our layer (if any) + DeviceCM* layer = fMCRec->fLayer; // may be null + // now detach it from fMCRec so we can pop(). Gets freed after its drawn + fMCRec->fLayer = NULL; + + // now do the normal restore() + fMCRec->~MCRec(); // balanced in save() + fMCStack.pop_back(); + fMCRec = (MCRec*)fMCStack.back(); + + /* Time to draw the layer's offscreen. We can't call the public drawSprite, + since if we're being recorded, we don't want to record this (the + recorder will have already recorded the restore). + */ + if (NULL != layer) { + if (layer->fNext) { + const SkIPoint& origin = layer->fDevice->getOrigin(); + this->internalDrawDevice(layer->fDevice, origin.x(), origin.y(), + layer->fPaint); + // reset this, since internalDrawDevice will have set it to true + fDeviceCMDirty = true; + + SkASSERT(fSaveLayerCount > 0); + fSaveLayerCount -= 1; + } + SkDELETE(layer); + } +} + +int SkCanvas::getSaveCount() const { + return fMCStack.count(); +} + +void SkCanvas::restoreToCount(int count) { + // sanity check + if (count < 1) { + count = 1; + } + + int n = this->getSaveCount() - count; + for (int i = 0; i < n; ++i) { + this->restore(); + } +} + +bool SkCanvas::isDrawingToLayer() const { + return fSaveLayerCount > 0; +} + +SkSurface* SkCanvas::newSurface(const SkImageInfo& info) { + return this->onNewSurface(info); +} + +SkSurface* SkCanvas::onNewSurface(const SkImageInfo& info) { + SkBaseDevice* dev = this->getDevice(); + return dev ? dev->newSurface(info) : NULL; +} + +SkImageInfo SkCanvas::imageInfo() const { + SkBaseDevice* dev = this->getDevice(); + if (dev) { + return dev->imageInfo(); + } else { + return SkImageInfo::MakeUnknown(0, 0); + } +} + +const void* SkCanvas::peekPixels(SkImageInfo* info, size_t* rowBytes) { + return this->onPeekPixels(info, rowBytes); +} + +const void* SkCanvas::onPeekPixels(SkImageInfo* info, size_t* rowBytes) { + SkBaseDevice* dev = this->getDevice(); + return dev ? dev->peekPixels(info, rowBytes) : NULL; +} + +void* SkCanvas::accessTopLayerPixels(SkImageInfo* info, size_t* rowBytes) { + return this->onAccessTopLayerPixels(info, rowBytes); +} + +void* SkCanvas::onAccessTopLayerPixels(SkImageInfo* info, size_t* rowBytes) { + SkBaseDevice* dev = this->getTopDevice(); + return dev ? dev->accessPixels(info, rowBytes) : NULL; +} + +SkAutoROCanvasPixels::SkAutoROCanvasPixels(SkCanvas* canvas) { + fAddr = canvas->peekPixels(&fInfo, &fRowBytes); + if (NULL == fAddr) { + fInfo = canvas->imageInfo(); + if (kUnknown_SkColorType == fInfo.colorType() || + !fBitmap.allocPixels(fInfo)) + { + return; // failure, fAddr is NULL + } + fBitmap.lockPixels(); + if (!canvas->readPixels(&fBitmap, 0, 0)) { + return; // failure, fAddr is NULL + } + fAddr = fBitmap.getPixels(); + fRowBytes = fBitmap.rowBytes(); + } + SkASSERT(fAddr); // success +} + +bool SkAutoROCanvasPixels::asROBitmap(SkBitmap* bitmap) const { + if (fAddr) { + return bitmap->installPixels(fInfo, const_cast(fAddr), fRowBytes, + NULL, NULL); + } else { + bitmap->reset(); + return false; + } +} + +void SkCanvas::onPushCull(const SkRect& cullRect) { + // do nothing. Subclasses may do something +} + +void SkCanvas::onPopCull() { + // do nothing. Subclasses may do something +} + +///////////////////////////////////////////////////////////////////////////// + +void SkCanvas::internalDrawBitmap(const SkBitmap& bitmap, + const SkMatrix& matrix, const SkPaint* paint) { + if (bitmap.drawsNothing()) { + return; + } + + SkLazyPaint lazy; + if (NULL == paint) { + paint = lazy.init(); + } + + SkDEBUGCODE(bitmap.validate();) + CHECK_LOCKCOUNT_BALANCE(bitmap); + + SkRect storage; + const SkRect* bounds = NULL; + if (paint && paint->canComputeFastBounds()) { + bitmap.getBounds(&storage); + matrix.mapRect(&storage); + bounds = &paint->computeFastBounds(storage, &storage); + } + + LOOPER_BEGIN(*paint, SkDrawFilter::kBitmap_Type, bounds) + + while (iter.next()) { + iter.fDevice->drawBitmap(iter, bitmap, matrix, looper.paint()); + } + + LOOPER_END +} + +void SkCanvas::internalDrawDevice(SkBaseDevice* srcDev, int x, int y, + const SkPaint* paint) { + SkPaint tmp; + if (NULL == paint) { + tmp.setDither(true); + paint = &tmp; + } + + LOOPER_BEGIN_DRAWDEVICE(*paint, SkDrawFilter::kBitmap_Type) + while (iter.next()) { + SkBaseDevice* dstDev = iter.fDevice; + paint = &looper.paint(); + SkImageFilter* filter = paint->getImageFilter(); + SkIPoint pos = { x - iter.getX(), y - iter.getY() }; + if (filter && !dstDev->canHandleImageFilter(filter)) { + SkDeviceImageFilterProxy proxy(dstDev); + SkBitmap dst; + SkIPoint offset = SkIPoint::Make(0, 0); + const SkBitmap& src = srcDev->accessBitmap(false); + SkMatrix matrix = *iter.fMatrix; + matrix.postTranslate(SkIntToScalar(-x), SkIntToScalar(-y)); + SkIRect clipBounds = SkIRect::MakeWH(srcDev->width(), srcDev->height()); + SkImageFilter::Context ctx(matrix, clipBounds); + if (filter->filterImage(&proxy, src, ctx, &dst, &offset)) { + SkPaint tmpUnfiltered(*paint); + tmpUnfiltered.setImageFilter(NULL); + dstDev->drawSprite(iter, dst, pos.x() + offset.x(), pos.y() + offset.y(), + tmpUnfiltered); + } + } else { + dstDev->drawDevice(iter, srcDev, pos.x(), pos.y(), *paint); + } + } + LOOPER_END +} + +void SkCanvas::drawSprite(const SkBitmap& bitmap, int x, int y, + const SkPaint* paint) { + if (bitmap.drawsNothing()) { + return; + } + SkDEBUGCODE(bitmap.validate();) + CHECK_LOCKCOUNT_BALANCE(bitmap); + + SkPaint tmp; + if (NULL == paint) { + paint = &tmp; + } + + LOOPER_BEGIN_DRAWDEVICE(*paint, SkDrawFilter::kBitmap_Type) + + while (iter.next()) { + paint = &looper.paint(); + SkImageFilter* filter = paint->getImageFilter(); + SkIPoint pos = { x - iter.getX(), y - iter.getY() }; + if (filter && !iter.fDevice->canHandleImageFilter(filter)) { + SkDeviceImageFilterProxy proxy(iter.fDevice); + SkBitmap dst; + SkIPoint offset = SkIPoint::Make(0, 0); + SkMatrix matrix = *iter.fMatrix; + matrix.postTranslate(SkIntToScalar(-x), SkIntToScalar(-y)); + SkIRect clipBounds = SkIRect::MakeWH(bitmap.width(), bitmap.height()); + SkImageFilter::Context ctx(matrix, clipBounds); + if (filter->filterImage(&proxy, bitmap, ctx, &dst, &offset)) { + SkPaint tmpUnfiltered(*paint); + tmpUnfiltered.setImageFilter(NULL); + iter.fDevice->drawSprite(iter, dst, pos.x() + offset.x(), pos.y() + offset.y(), + tmpUnfiltered); + } + } else { + iter.fDevice->drawSprite(iter, bitmap, pos.x(), pos.y(), *paint); + } + } + LOOPER_END +} + +///////////////////////////////////////////////////////////////////////////// +void SkCanvas::didTranslate(SkScalar, SkScalar) { + // Do nothing. Subclasses may do something. +} + +bool SkCanvas::translate(SkScalar dx, SkScalar dy) { + fDeviceCMDirty = true; + fCachedLocalClipBoundsDirty = true; + bool res = fMCRec->fMatrix->preTranslate(dx, dy); + + this->didTranslate(dx, dy); + return res; +} + +void SkCanvas::didScale(SkScalar, SkScalar) { + // Do nothing. Subclasses may do something. +} + +bool SkCanvas::scale(SkScalar sx, SkScalar sy) { + fDeviceCMDirty = true; + fCachedLocalClipBoundsDirty = true; + bool res = fMCRec->fMatrix->preScale(sx, sy); + + this->didScale(sx, sy); + return res; +} + +void SkCanvas::didRotate(SkScalar) { + // Do nothing. Subclasses may do something. +} + +bool SkCanvas::rotate(SkScalar degrees) { + fDeviceCMDirty = true; + fCachedLocalClipBoundsDirty = true; + bool res = fMCRec->fMatrix->preRotate(degrees); + + this->didRotate(degrees); + return res; +} + +void SkCanvas::didSkew(SkScalar, SkScalar) { + // Do nothing. Subclasses may do something. +} + +bool SkCanvas::skew(SkScalar sx, SkScalar sy) { + fDeviceCMDirty = true; + fCachedLocalClipBoundsDirty = true; + bool res = fMCRec->fMatrix->preSkew(sx, sy); + + this->didSkew(sx, sy); + return res; +} + +void SkCanvas::didConcat(const SkMatrix&) { + // Do nothing. Subclasses may do something. +} + +bool SkCanvas::concat(const SkMatrix& matrix) { + fDeviceCMDirty = true; + fCachedLocalClipBoundsDirty = true; + bool res = fMCRec->fMatrix->preConcat(matrix); + + this->didConcat(matrix); + return res; +} + +void SkCanvas::didSetMatrix(const SkMatrix&) { + // Do nothing. Subclasses may do something. +} + +void SkCanvas::setMatrix(const SkMatrix& matrix) { + fDeviceCMDirty = true; + fCachedLocalClipBoundsDirty = true; + *fMCRec->fMatrix = matrix; + this->didSetMatrix(matrix); +} + +void SkCanvas::resetMatrix() { + SkMatrix matrix; + + matrix.reset(); + this->setMatrix(matrix); +} + +////////////////////////////////////////////////////////////////////////////// + +void SkCanvas::clipRect(const SkRect& rect, SkRegion::Op op, bool doAA) { + ClipEdgeStyle edgeStyle = doAA ? kSoft_ClipEdgeStyle : kHard_ClipEdgeStyle; + this->onClipRect(rect, op, edgeStyle); +} + +void SkCanvas::onClipRect(const SkRect& rect, SkRegion::Op op, ClipEdgeStyle edgeStyle) { +#ifdef SK_ENABLE_CLIP_QUICKREJECT + if (SkRegion::kIntersect_Op == op) { + if (fMCRec->fRasterClip->isEmpty()) { + return false; + } + + if (this->quickReject(rect)) { + fDeviceCMDirty = true; + fCachedLocalClipBoundsDirty = true; + + fClipStack.clipEmpty(); + return fMCRec->fRasterClip->setEmpty(); + } + } +#endif + + AutoValidateClip avc(this); + + fDeviceCMDirty = true; + fCachedLocalClipBoundsDirty = true; + if (!fAllowSoftClip) { + edgeStyle = kHard_ClipEdgeStyle; + } + + if (fMCRec->fMatrix->rectStaysRect()) { + // for these simpler matrices, we can stay a rect even after applying + // the matrix. This means we don't have to a) make a path, and b) tell + // the region code to scan-convert the path, only to discover that it + // is really just a rect. + SkRect r; + + fMCRec->fMatrix->mapRect(&r, rect); + fClipStack.clipDevRect(r, op, kSoft_ClipEdgeStyle == edgeStyle); + fMCRec->fRasterClip->op(r, op, kSoft_ClipEdgeStyle == edgeStyle); + } else { + // since we're rotated or some such thing, we convert the rect to a path + // and clip against that, since it can handle any matrix. However, to + // avoid recursion in the case where we are subclassed (e.g. Pictures) + // we explicitly call "our" version of clipPath. + SkPath path; + + path.addRect(rect); + this->SkCanvas::onClipPath(path, op, edgeStyle); + } +} + +static void clip_path_helper(const SkCanvas* canvas, SkRasterClip* currClip, + const SkPath& devPath, SkRegion::Op op, bool doAA) { + // base is used to limit the size (and therefore memory allocation) of the + // region that results from scan converting devPath. + SkRegion base; + + if (SkRegion::kIntersect_Op == op) { + // since we are intersect, we can do better (tighter) with currRgn's + // bounds, than just using the device. However, if currRgn is complex, + // our region blitter may hork, so we do that case in two steps. + if (currClip->isRect()) { + // FIXME: we should also be able to do this when currClip->isBW(), + // but relaxing the test above triggers GM asserts in + // SkRgnBuilder::blitH(). We need to investigate what's going on. + currClip->setPath(devPath, currClip->bwRgn(), doAA); + } else { + base.setRect(currClip->getBounds()); + SkRasterClip clip; + clip.setPath(devPath, base, doAA); + currClip->op(clip, op); + } + } else { + const SkBaseDevice* device = canvas->getDevice(); + if (!device) { + currClip->setEmpty(); + return; + } + + base.setRect(0, 0, device->width(), device->height()); + + if (SkRegion::kReplace_Op == op) { + currClip->setPath(devPath, base, doAA); + } else { + SkRasterClip clip; + clip.setPath(devPath, base, doAA); + currClip->op(clip, op); + } + } +} + +void SkCanvas::clipRRect(const SkRRect& rrect, SkRegion::Op op, bool doAA) { + ClipEdgeStyle edgeStyle = doAA ? kSoft_ClipEdgeStyle : kHard_ClipEdgeStyle; + if (rrect.isRect()) { + this->onClipRect(rrect.getBounds(), op, edgeStyle); + } else { + this->onClipRRect(rrect, op, edgeStyle); + } +} + +void SkCanvas::onClipRRect(const SkRRect& rrect, SkRegion::Op op, ClipEdgeStyle edgeStyle) { + SkRRect transformedRRect; + if (rrect.transform(*fMCRec->fMatrix, &transformedRRect)) { + AutoValidateClip avc(this); + + fDeviceCMDirty = true; + fCachedLocalClipBoundsDirty = true; + if (!fAllowSoftClip) { + edgeStyle = kHard_ClipEdgeStyle; + } + + fClipStack.clipDevRRect(transformedRRect, op, kSoft_ClipEdgeStyle == edgeStyle); + + SkPath devPath; + devPath.addRRect(transformedRRect); + + clip_path_helper(this, fMCRec->fRasterClip, devPath, op, kSoft_ClipEdgeStyle == edgeStyle); + return; + } + + SkPath path; + path.addRRect(rrect); + // call the non-virtual version + this->SkCanvas::onClipPath(path, op, edgeStyle); +} + +void SkCanvas::clipPath(const SkPath& path, SkRegion::Op op, bool doAA) { + ClipEdgeStyle edgeStyle = doAA ? kSoft_ClipEdgeStyle : kHard_ClipEdgeStyle; + SkRect r; + if (!path.isInverseFillType() && path.isRect(&r)) { + this->onClipRect(r, op, edgeStyle); + } else { + this->onClipPath(path, op, edgeStyle); + } +} + +void SkCanvas::onClipPath(const SkPath& path, SkRegion::Op op, ClipEdgeStyle edgeStyle) { +#ifdef SK_ENABLE_CLIP_QUICKREJECT + if (SkRegion::kIntersect_Op == op && !path.isInverseFillType()) { + if (fMCRec->fRasterClip->isEmpty()) { + return false; + } + + if (this->quickReject(path.getBounds())) { + fDeviceCMDirty = true; + fCachedLocalClipBoundsDirty = true; + + fClipStack.clipEmpty(); + return fMCRec->fRasterClip->setEmpty(); + } + } +#endif + + AutoValidateClip avc(this); + + fDeviceCMDirty = true; + fCachedLocalClipBoundsDirty = true; + if (!fAllowSoftClip) { + edgeStyle = kHard_ClipEdgeStyle; + } + + SkPath devPath; + path.transform(*fMCRec->fMatrix, &devPath); + + // Check if the transfomation, or the original path itself + // made us empty. Note this can also happen if we contained NaN + // values. computing the bounds detects this, and will set our + // bounds to empty if that is the case. (see SkRect::set(pts, count)) + if (devPath.getBounds().isEmpty()) { + // resetting the path will remove any NaN or other wanky values + // that might upset our scan converter. + devPath.reset(); + } + + // if we called path.swap() we could avoid a deep copy of this path + fClipStack.clipDevPath(devPath, op, kSoft_ClipEdgeStyle == edgeStyle); + + if (fAllowSimplifyClip) { + devPath.reset(); + devPath.setFillType(SkPath::kInverseEvenOdd_FillType); + const SkClipStack* clipStack = getClipStack(); + SkClipStack::Iter iter(*clipStack, SkClipStack::Iter::kBottom_IterStart); + const SkClipStack::Element* element; + while ((element = iter.next())) { + SkClipStack::Element::Type type = element->getType(); + if (type == SkClipStack::Element::kEmpty_Type) { + continue; + } + SkPath operand; + element->asPath(&operand); + SkRegion::Op elementOp = element->getOp(); + if (elementOp == SkRegion::kReplace_Op) { + devPath = operand; + } else { + Op(devPath, operand, (SkPathOp) elementOp, &devPath); + } + // if the prev and curr clips disagree about aa -vs- not, favor the aa request. + // perhaps we need an API change to avoid this sort of mixed-signals about + // clipping. + if (element->isAA()) { + edgeStyle = kSoft_ClipEdgeStyle; + } + } + op = SkRegion::kReplace_Op; + } + + clip_path_helper(this, fMCRec->fRasterClip, devPath, op, edgeStyle); +} + +void SkCanvas::updateClipConservativelyUsingBounds(const SkRect& bounds, SkRegion::Op op, + bool inverseFilled) { + // This is for updating the clip conservatively using only bounds + // information. + // Contract: + // The current clip must contain the true clip. The true + // clip is the clip that would have normally been computed + // by calls to clipPath and clipRRect + // Objective: + // Keep the current clip as small as possible without + // breaking the contract, using only clip bounding rectangles + // (for performance). + + // N.B.: This *never* calls back through a virtual on canvas, so subclasses + // don't have to worry about getting caught in a loop. Thus anywhere + // we call a virtual method, we explicitly prefix it with + // SkCanvas:: to be sure to call the base-class. + + if (inverseFilled) { + switch (op) { + case SkRegion::kIntersect_Op: + case SkRegion::kDifference_Op: + // These ops can only shrink the current clip. So leaving + // the clip unchanged conservatively respects the contract. + break; + case SkRegion::kUnion_Op: + case SkRegion::kReplace_Op: + case SkRegion::kReverseDifference_Op: + case SkRegion::kXOR_Op: { + // These ops can grow the current clip up to the extents of + // the input clip, which is inverse filled, so we just set + // the current clip to the device bounds. + SkRect deviceBounds; + SkIRect deviceIBounds; + this->getDevice()->getGlobalBounds(&deviceIBounds); + deviceBounds = SkRect::Make(deviceIBounds); + this->SkCanvas::save(SkCanvas::kMatrix_SaveFlag); + // set the clip in device space + this->SkCanvas::setMatrix(SkMatrix::I()); + this->SkCanvas::onClipRect(deviceBounds, SkRegion::kReplace_Op, + kHard_ClipEdgeStyle); + this->SkCanvas::restore(); //pop the matrix, but keep the clip + break; + } + default: + SkASSERT(0); // unhandled op? + } + } else { + // Not inverse filled + switch (op) { + case SkRegion::kIntersect_Op: + case SkRegion::kUnion_Op: + case SkRegion::kReplace_Op: + this->SkCanvas::onClipRect(bounds, op, kHard_ClipEdgeStyle); + break; + case SkRegion::kDifference_Op: + // Difference can only shrink the current clip. + // Leaving clip unchanged conservatively fullfills the contract. + break; + case SkRegion::kReverseDifference_Op: + // To reverse, we swap in the bounds with a replace op. + // As with difference, leave it unchanged. + this->SkCanvas::onClipRect(bounds, SkRegion::kReplace_Op, kHard_ClipEdgeStyle); + break; + case SkRegion::kXOR_Op: + // Be conservative, based on (A XOR B) always included in (A union B), + // which is always included in (bounds(A) union bounds(B)) + this->SkCanvas::onClipRect(bounds, SkRegion::kUnion_Op, kHard_ClipEdgeStyle); + break; + default: + SkASSERT(0); // unhandled op? + } + } +} + +void SkCanvas::clipRegion(const SkRegion& rgn, SkRegion::Op op) { + this->onClipRegion(rgn, op); +} + +void SkCanvas::onClipRegion(const SkRegion& rgn, SkRegion::Op op) { + AutoValidateClip avc(this); + + fDeviceCMDirty = true; + fCachedLocalClipBoundsDirty = true; + + // todo: signal fClipStack that we have a region, and therefore (I guess) + // we have to ignore it, and use the region directly? + fClipStack.clipDevRect(rgn.getBounds(), op); + + fMCRec->fRasterClip->op(rgn, op); +} + +#ifdef SK_DEBUG +void SkCanvas::validateClip() const { + // construct clipRgn from the clipstack + const SkBaseDevice* device = this->getDevice(); + if (!device) { + SkASSERT(this->isClipEmpty()); + return; + } + + SkIRect ir; + ir.set(0, 0, device->width(), device->height()); + SkRasterClip tmpClip(ir); + + SkClipStack::B2TIter iter(fClipStack); + const SkClipStack::Element* element; + while ((element = iter.next()) != NULL) { + switch (element->getType()) { + case SkClipStack::Element::kRect_Type: + element->getRect().round(&ir); + tmpClip.op(ir, element->getOp()); + break; + case SkClipStack::Element::kEmpty_Type: + tmpClip.setEmpty(); + break; + default: { + SkPath path; + element->asPath(&path); + clip_path_helper(this, &tmpClip, path, element->getOp(), element->isAA()); + break; + } + } + } +} +#endif + +void SkCanvas::replayClips(ClipVisitor* visitor) const { + SkClipStack::B2TIter iter(fClipStack); + const SkClipStack::Element* element; + + static const SkRect kEmpty = { 0, 0, 0, 0 }; + while ((element = iter.next()) != NULL) { + switch (element->getType()) { + case SkClipStack::Element::kPath_Type: + visitor->clipPath(element->getPath(), element->getOp(), element->isAA()); + break; + case SkClipStack::Element::kRRect_Type: + visitor->clipRRect(element->getRRect(), element->getOp(), element->isAA()); + break; + case SkClipStack::Element::kRect_Type: + visitor->clipRect(element->getRect(), element->getOp(), element->isAA()); + break; + case SkClipStack::Element::kEmpty_Type: + visitor->clipRect(kEmpty, SkRegion::kIntersect_Op, false); + break; + } + } +} + +/////////////////////////////////////////////////////////////////////////////// + +bool SkCanvas::isClipEmpty() const { + return fMCRec->fRasterClip->isEmpty(); +} + +bool SkCanvas::isClipRect() const { + return fMCRec->fRasterClip->isRect(); +} + +bool SkCanvas::quickReject(const SkRect& rect) const { + + if (!rect.isFinite()) + return true; + + if (fMCRec->fRasterClip->isEmpty()) { + return true; + } + + if (fMCRec->fMatrix->hasPerspective()) { + SkRect dst; + fMCRec->fMatrix->mapRect(&dst, rect); + SkIRect idst; + dst.roundOut(&idst); + return !SkIRect::Intersects(idst, fMCRec->fRasterClip->getBounds()); + } else { + const SkRect& clipR = this->getLocalClipBounds(); + + // for speed, do the most likely reject compares first + // TODO: should we use | instead, or compare all 4 at once? + if (rect.fTop >= clipR.fBottom || rect.fBottom <= clipR.fTop) { + return true; + } + if (rect.fLeft >= clipR.fRight || rect.fRight <= clipR.fLeft) { + return true; + } + return false; + } +} + +bool SkCanvas::quickReject(const SkPath& path) const { + return path.isEmpty() || this->quickReject(path.getBounds()); +} + +bool SkCanvas::getClipBounds(SkRect* bounds) const { + SkIRect ibounds; + if (!this->getClipDeviceBounds(&ibounds)) { + return false; + } + + SkMatrix inverse; + // if we can't invert the CTM, we can't return local clip bounds + if (!fMCRec->fMatrix->invert(&inverse)) { + if (bounds) { + bounds->setEmpty(); + } + return false; + } + + if (NULL != bounds) { + SkRect r; + // adjust it outwards in case we are antialiasing + const int inset = 1; + + r.iset(ibounds.fLeft - inset, ibounds.fTop - inset, + ibounds.fRight + inset, ibounds.fBottom + inset); + inverse.mapRect(bounds, r); + } + return true; +} + +bool SkCanvas::getClipDeviceBounds(SkIRect* bounds) const { + const SkRasterClip& clip = *fMCRec->fRasterClip; + if (clip.isEmpty()) { + if (bounds) { + bounds->setEmpty(); + } + return false; + } + + if (NULL != bounds) { + *bounds = clip.getBounds(); + } + return true; +} + +const SkMatrix& SkCanvas::getTotalMatrix() const { + return *fMCRec->fMatrix; +} + +#ifdef SK_SUPPORT_LEGACY_GETCLIPTYPE +SkCanvas::ClipType SkCanvas::getClipType() const { + if (fMCRec->fRasterClip->isEmpty()) { + return kEmpty_ClipType; + } + if (fMCRec->fRasterClip->isRect()) { + return kRect_ClipType; + } + return kComplex_ClipType; +} +#endif + +#ifdef SK_SUPPORT_LEGACY_GETTOTALCLIP +const SkRegion& SkCanvas::getTotalClip() const { + return fMCRec->fRasterClip->forceGetBW(); +} +#endif + +const SkRegion& SkCanvas::internal_private_getTotalClip() const { + return fMCRec->fRasterClip->forceGetBW(); +} + +void SkCanvas::internal_private_getTotalClipAsPath(SkPath* path) const { + path->reset(); + + const SkRegion& rgn = fMCRec->fRasterClip->forceGetBW(); + if (rgn.isEmpty()) { + return; + } + (void)rgn.getBoundaryPath(path); +} + +GrRenderTarget* SkCanvas::internal_private_accessTopLayerRenderTarget() { + SkBaseDevice* dev = this->getTopDevice(); + return dev ? dev->accessRenderTarget() : NULL; +} + +SkBaseDevice* SkCanvas::createLayerDevice(const SkImageInfo& info) { + SkBaseDevice* device = this->getTopDevice(); + return device ? device->createCompatibleDeviceForSaveLayer(info) : NULL; +} + +GrContext* SkCanvas::getGrContext() { +#if SK_SUPPORT_GPU + SkBaseDevice* device = this->getTopDevice(); + if (NULL != device) { + GrRenderTarget* renderTarget = device->accessRenderTarget(); + if (NULL != renderTarget) { + return renderTarget->getContext(); + } + } +#endif + + return NULL; + +} + +void SkCanvas::drawDRRect(const SkRRect& outer, const SkRRect& inner, + const SkPaint& paint) { + if (outer.isEmpty()) { + return; + } + if (inner.isEmpty()) { + this->drawRRect(outer, paint); + return; + } + + // We don't have this method (yet), but technically this is what we should + // be able to assert... + // SkASSERT(outer.contains(inner)); + // + // For now at least check for containment of bounds + SkASSERT(outer.getBounds().contains(inner.getBounds())); + + this->onDrawDRRect(outer, inner, paint); +} + +////////////////////////////////////////////////////////////////////////////// +// These are the virtual drawing methods +////////////////////////////////////////////////////////////////////////////// + +void SkCanvas::clear(SkColor color) { + SkDrawIter iter(this); + this->predrawNotify(); + while (iter.next()) { + iter.fDevice->clear(color); + } +} + +void SkCanvas::drawPaint(const SkPaint& paint) { + this->internalDrawPaint(paint); +} + +void SkCanvas::internalDrawPaint(const SkPaint& paint) { + CHECK_SHADER_NOSETCONTEXT(paint); + + LOOPER_BEGIN(paint, SkDrawFilter::kPaint_Type, NULL) + + while (iter.next()) { + iter.fDevice->drawPaint(iter, looper.paint()); + } + + LOOPER_END +} + +void SkCanvas::drawPoints(PointMode mode, size_t count, const SkPoint pts[], + const SkPaint& paint) { + if ((long)count <= 0) { + return; + } + + CHECK_SHADER_NOSETCONTEXT(paint); + + SkRect r, storage; + const SkRect* bounds = NULL; + if (paint.canComputeFastBounds()) { + // special-case 2 points (common for drawing a single line) + if (2 == count) { + r.set(pts[0], pts[1]); + } else { + r.set(pts, SkToInt(count)); + } + bounds = &paint.computeFastStrokeBounds(r, &storage); + if (this->quickReject(*bounds)) { + return; + } + } + + SkASSERT(pts != NULL); + + LOOPER_BEGIN(paint, SkDrawFilter::kPoint_Type, bounds) + + while (iter.next()) { + iter.fDevice->drawPoints(iter, mode, count, pts, looper.paint()); + } + + LOOPER_END +} + +void SkCanvas::drawRect(const SkRect& r, const SkPaint& paint) { + CHECK_SHADER_NOSETCONTEXT(paint); + + SkRect storage; + const SkRect* bounds = NULL; + if (paint.canComputeFastBounds()) { + bounds = &paint.computeFastBounds(r, &storage); + if (this->quickReject(*bounds)) { + return; + } + } + + LOOPER_BEGIN(paint, SkDrawFilter::kRect_Type, bounds) + + while (iter.next()) { + iter.fDevice->drawRect(iter, r, looper.paint()); + } + + LOOPER_END +} + +void SkCanvas::drawOval(const SkRect& oval, const SkPaint& paint) { + CHECK_SHADER_NOSETCONTEXT(paint); + + SkRect storage; + const SkRect* bounds = NULL; + if (paint.canComputeFastBounds()) { + bounds = &paint.computeFastBounds(oval, &storage); + if (this->quickReject(*bounds)) { + return; + } + } + + LOOPER_BEGIN(paint, SkDrawFilter::kOval_Type, bounds) + + while (iter.next()) { + iter.fDevice->drawOval(iter, oval, looper.paint()); + } + + LOOPER_END +} + +void SkCanvas::drawRRect(const SkRRect& rrect, const SkPaint& paint) { + CHECK_SHADER_NOSETCONTEXT(paint); + + SkRect storage; + const SkRect* bounds = NULL; + if (paint.canComputeFastBounds()) { + bounds = &paint.computeFastBounds(rrect.getBounds(), &storage); + if (this->quickReject(*bounds)) { + return; + } + } + + if (rrect.isRect()) { + // call the non-virtual version + this->SkCanvas::drawRect(rrect.getBounds(), paint); + return; + } else if (rrect.isOval()) { + // call the non-virtual version + this->SkCanvas::drawOval(rrect.getBounds(), paint); + return; + } + + LOOPER_BEGIN(paint, SkDrawFilter::kRRect_Type, bounds) + + while (iter.next()) { + iter.fDevice->drawRRect(iter, rrect, looper.paint()); + } + + LOOPER_END +} + +void SkCanvas::onDrawDRRect(const SkRRect& outer, const SkRRect& inner, + const SkPaint& paint) { + CHECK_SHADER_NOSETCONTEXT(paint); + + SkRect storage; + const SkRect* bounds = NULL; + if (paint.canComputeFastBounds()) { + bounds = &paint.computeFastBounds(outer.getBounds(), &storage); + if (this->quickReject(*bounds)) { + return; + } + } + + LOOPER_BEGIN(paint, SkDrawFilter::kRRect_Type, bounds) + + while (iter.next()) { + iter.fDevice->drawDRRect(iter, outer, inner, looper.paint()); + } + + LOOPER_END +} + +void SkCanvas::drawPath(const SkPath& path, const SkPaint& paint) { + CHECK_SHADER_NOSETCONTEXT(paint); + + if (!path.isFinite()) { + return; + } + + SkRect storage; + const SkRect* bounds = NULL; + if (!path.isInverseFillType() && paint.canComputeFastBounds()) { + const SkRect& pathBounds = path.getBounds(); + bounds = &paint.computeFastBounds(pathBounds, &storage); + if (this->quickReject(*bounds)) { + return; + } + } + + const SkRect& r = path.getBounds(); + if (r.width() <= 0 && r.height() <= 0) { + if (path.isInverseFillType()) { + this->internalDrawPaint(paint); + } + return; + } + + LOOPER_BEGIN(paint, SkDrawFilter::kPath_Type, bounds) + + while (iter.next()) { + iter.fDevice->drawPath(iter, path, looper.paint()); + } + + LOOPER_END +} + +void SkCanvas::drawBitmap(const SkBitmap& bitmap, SkScalar x, SkScalar y, + const SkPaint* paint) { + SkDEBUGCODE(bitmap.validate();) + + if (NULL == paint || paint->canComputeFastBounds()) { + SkRect bounds = { + x, y, + x + SkIntToScalar(bitmap.width()), + y + SkIntToScalar(bitmap.height()) + }; + if (paint) { + (void)paint->computeFastBounds(bounds, &bounds); + } + if (this->quickReject(bounds)) { + return; + } + } + + SkMatrix matrix; + matrix.setTranslate(x, y); + this->internalDrawBitmap(bitmap, matrix, paint); +} + +// this one is non-virtual, so it can be called safely by other canvas apis +void SkCanvas::internalDrawBitmapRect(const SkBitmap& bitmap, const SkRect* src, + const SkRect& dst, const SkPaint* paint, + DrawBitmapRectFlags flags) { + if (bitmap.drawsNothing() || dst.isEmpty()) { + return; + } + + CHECK_LOCKCOUNT_BALANCE(bitmap); + + SkRect storage; + const SkRect* bounds = &dst; + if (NULL == paint || paint->canComputeFastBounds()) { + if (paint) { + bounds = &paint->computeFastBounds(dst, &storage); + } + if (this->quickReject(*bounds)) { + return; + } + } + + SkLazyPaint lazy; + if (NULL == paint) { + paint = lazy.init(); + } + + LOOPER_BEGIN(*paint, SkDrawFilter::kBitmap_Type, bounds) + + while (iter.next()) { + iter.fDevice->drawBitmapRect(iter, bitmap, src, dst, looper.paint(), flags); + } + + LOOPER_END +} + +void SkCanvas::drawBitmapRectToRect(const SkBitmap& bitmap, const SkRect* src, + const SkRect& dst, const SkPaint* paint, + DrawBitmapRectFlags flags) { + SkDEBUGCODE(bitmap.validate();) + this->internalDrawBitmapRect(bitmap, src, dst, paint, flags); +} + +void SkCanvas::drawBitmapMatrix(const SkBitmap& bitmap, const SkMatrix& matrix, + const SkPaint* paint) { + SkDEBUGCODE(bitmap.validate();) + this->internalDrawBitmap(bitmap, matrix, paint); +} + +void SkCanvas::internalDrawBitmapNine(const SkBitmap& bitmap, + const SkIRect& center, const SkRect& dst, + const SkPaint* paint) { + if (bitmap.drawsNothing()) { + return; + } + if (NULL == paint || paint->canComputeFastBounds()) { + SkRect storage; + const SkRect* bounds = &dst; + if (paint) { + bounds = &paint->computeFastBounds(dst, &storage); + } + if (this->quickReject(*bounds)) { + return; + } + } + + const int32_t w = bitmap.width(); + const int32_t h = bitmap.height(); + + SkIRect c = center; + // pin center to the bounds of the bitmap + c.fLeft = SkMax32(0, center.fLeft); + c.fTop = SkMax32(0, center.fTop); + c.fRight = SkPin32(center.fRight, c.fLeft, w); + c.fBottom = SkPin32(center.fBottom, c.fTop, h); + + const SkScalar srcX[4] = { + 0, SkIntToScalar(c.fLeft), SkIntToScalar(c.fRight), SkIntToScalar(w) + }; + const SkScalar srcY[4] = { + 0, SkIntToScalar(c.fTop), SkIntToScalar(c.fBottom), SkIntToScalar(h) + }; + SkScalar dstX[4] = { + dst.fLeft, dst.fLeft + SkIntToScalar(c.fLeft), + dst.fRight - SkIntToScalar(w - c.fRight), dst.fRight + }; + SkScalar dstY[4] = { + dst.fTop, dst.fTop + SkIntToScalar(c.fTop), + dst.fBottom - SkIntToScalar(h - c.fBottom), dst.fBottom + }; + + if (dstX[1] > dstX[2]) { + dstX[1] = dstX[0] + (dstX[3] - dstX[0]) * c.fLeft / (w - c.width()); + dstX[2] = dstX[1]; + } + + if (dstY[1] > dstY[2]) { + dstY[1] = dstY[0] + (dstY[3] - dstY[0]) * c.fTop / (h - c.height()); + dstY[2] = dstY[1]; + } + + for (int y = 0; y < 3; y++) { + SkRect s, d; + + s.fTop = srcY[y]; + s.fBottom = srcY[y+1]; + d.fTop = dstY[y]; + d.fBottom = dstY[y+1]; + for (int x = 0; x < 3; x++) { + s.fLeft = srcX[x]; + s.fRight = srcX[x+1]; + d.fLeft = dstX[x]; + d.fRight = dstX[x+1]; + this->internalDrawBitmapRect(bitmap, &s, d, paint, + kNone_DrawBitmapRectFlag); + } + } +} + +void SkCanvas::drawBitmapNine(const SkBitmap& bitmap, const SkIRect& center, + const SkRect& dst, const SkPaint* paint) { + SkDEBUGCODE(bitmap.validate();) + + // Need a device entry-point, so gpu can use a mesh + this->internalDrawBitmapNine(bitmap, center, dst, paint); +} + +class SkDeviceFilteredPaint { +public: + SkDeviceFilteredPaint(SkBaseDevice* device, const SkPaint& paint) { + SkBaseDevice::TextFlags flags; + if (device->filterTextFlags(paint, &flags)) { + SkPaint* newPaint = fLazy.set(paint); + newPaint->setFlags(flags.fFlags); + newPaint->setHinting(flags.fHinting); + fPaint = newPaint; + } else { + fPaint = &paint; + } + } + + const SkPaint& paint() const { return *fPaint; } + +private: + const SkPaint* fPaint; + SkLazyPaint fLazy; +}; + +void SkCanvas::DrawRect(const SkDraw& draw, const SkPaint& paint, + const SkRect& r, SkScalar textSize) { + if (paint.getStyle() == SkPaint::kFill_Style) { + draw.fDevice->drawRect(draw, r, paint); + } else { + SkPaint p(paint); + p.setStrokeWidth(SkScalarMul(textSize, paint.getStrokeWidth())); + draw.fDevice->drawRect(draw, r, p); + } +} + +void SkCanvas::DrawTextDecorations(const SkDraw& draw, const SkPaint& paint, + const char text[], size_t byteLength, + SkScalar x, SkScalar y) { + SkASSERT(byteLength == 0 || text != NULL); + + // nothing to draw + if (text == NULL || byteLength == 0 || + draw.fClip->isEmpty() || + (paint.getAlpha() == 0 && paint.getXfermode() == NULL)) { + return; + } + + SkScalar width = 0; + SkPoint start; + + start.set(0, 0); // to avoid warning + if (paint.getFlags() & (SkPaint::kUnderlineText_Flag | + SkPaint::kStrikeThruText_Flag)) { + width = paint.measureText(text, byteLength); + + SkScalar offsetX = 0; + if (paint.getTextAlign() == SkPaint::kCenter_Align) { + offsetX = SkScalarHalf(width); + } else if (paint.getTextAlign() == SkPaint::kRight_Align) { + offsetX = width; + } + start.set(x - offsetX, y); + } + + if (0 == width) { + return; + } + + uint32_t flags = paint.getFlags(); + + if (flags & (SkPaint::kUnderlineText_Flag | + SkPaint::kStrikeThruText_Flag)) { + SkScalar textSize = paint.getTextSize(); + SkScalar height = SkScalarMul(textSize, kStdUnderline_Thickness); + SkRect r; + + r.fLeft = start.fX; + r.fRight = start.fX + width; + + if (flags & SkPaint::kUnderlineText_Flag) { + SkScalar offset = SkScalarMulAdd(textSize, kStdUnderline_Offset, + start.fY); + r.fTop = offset; + r.fBottom = offset + height; + DrawRect(draw, paint, r, textSize); + } + if (flags & SkPaint::kStrikeThruText_Flag) { + SkScalar offset = SkScalarMulAdd(textSize, kStdStrikeThru_Offset, + start.fY); + r.fTop = offset; + r.fBottom = offset + height; + DrawRect(draw, paint, r, textSize); + } + } +} + +void SkCanvas::drawText(const void* text, size_t byteLength, + SkScalar x, SkScalar y, const SkPaint& paint) { + CHECK_SHADER_NOSETCONTEXT(paint); + + LOOPER_BEGIN(paint, SkDrawFilter::kText_Type, NULL) + + while (iter.next()) { + SkDeviceFilteredPaint dfp(iter.fDevice, looper.paint()); + iter.fDevice->drawText(iter, text, byteLength, x, y, dfp.paint()); + DrawTextDecorations(iter, dfp.paint(), + static_cast(text), byteLength, x, y); + } + + LOOPER_END +} + +void SkCanvas::drawPosText(const void* text, size_t byteLength, + const SkPoint pos[], const SkPaint& paint) { + CHECK_SHADER_NOSETCONTEXT(paint); + + LOOPER_BEGIN(paint, SkDrawFilter::kText_Type, NULL) + + while (iter.next()) { + SkDeviceFilteredPaint dfp(iter.fDevice, looper.paint()); + iter.fDevice->drawPosText(iter, text, byteLength, &pos->fX, 0, 2, + dfp.paint()); + } + + LOOPER_END +} + +void SkCanvas::drawPosTextH(const void* text, size_t byteLength, + const SkScalar xpos[], SkScalar constY, + const SkPaint& paint) { + CHECK_SHADER_NOSETCONTEXT(paint); + + LOOPER_BEGIN(paint, SkDrawFilter::kText_Type, NULL) + + while (iter.next()) { + SkDeviceFilteredPaint dfp(iter.fDevice, looper.paint()); + iter.fDevice->drawPosText(iter, text, byteLength, xpos, constY, 1, + dfp.paint()); + } + + LOOPER_END +} + +void SkCanvas::drawTextOnPath(const void* text, size_t byteLength, + const SkPath& path, const SkMatrix* matrix, + const SkPaint& paint) { + CHECK_SHADER_NOSETCONTEXT(paint); + + LOOPER_BEGIN(paint, SkDrawFilter::kText_Type, NULL) + + while (iter.next()) { + iter.fDevice->drawTextOnPath(iter, text, byteLength, path, + matrix, looper.paint()); + } + + LOOPER_END +} + +void SkCanvas::drawVertices(VertexMode vmode, int vertexCount, + const SkPoint verts[], const SkPoint texs[], + const SkColor colors[], SkXfermode* xmode, + const uint16_t indices[], int indexCount, + const SkPaint& paint) { + CHECK_SHADER_NOSETCONTEXT(paint); + + LOOPER_BEGIN(paint, SkDrawFilter::kPath_Type, NULL) + + while (iter.next()) { + iter.fDevice->drawVertices(iter, vmode, vertexCount, verts, texs, + colors, xmode, indices, indexCount, + looper.paint()); + } + + LOOPER_END +} + +////////////////////////////////////////////////////////////////////////////// +// These methods are NOT virtual, and therefore must call back into virtual +// methods, rather than actually drawing themselves. +////////////////////////////////////////////////////////////////////////////// + +void SkCanvas::drawARGB(U8CPU a, U8CPU r, U8CPU g, U8CPU b, + SkXfermode::Mode mode) { + SkPaint paint; + + paint.setARGB(a, r, g, b); + if (SkXfermode::kSrcOver_Mode != mode) { + paint.setXfermodeMode(mode); + } + this->drawPaint(paint); +} + +void SkCanvas::drawColor(SkColor c, SkXfermode::Mode mode) { + SkPaint paint; + + paint.setColor(c); + if (SkXfermode::kSrcOver_Mode != mode) { + paint.setXfermodeMode(mode); + } + this->drawPaint(paint); +} + +void SkCanvas::drawPoint(SkScalar x, SkScalar y, const SkPaint& paint) { + SkPoint pt; + + pt.set(x, y); + this->drawPoints(kPoints_PointMode, 1, &pt, paint); +} + +void SkCanvas::drawPoint(SkScalar x, SkScalar y, SkColor color) { + SkPoint pt; + SkPaint paint; + + pt.set(x, y); + paint.setColor(color); + this->drawPoints(kPoints_PointMode, 1, &pt, paint); +} + +void SkCanvas::drawLine(SkScalar x0, SkScalar y0, SkScalar x1, SkScalar y1, + const SkPaint& paint) { + SkPoint pts[2]; + + pts[0].set(x0, y0); + pts[1].set(x1, y1); + this->drawPoints(kLines_PointMode, 2, pts, paint); +} + +void SkCanvas::drawRectCoords(SkScalar left, SkScalar top, + SkScalar right, SkScalar bottom, + const SkPaint& paint) { + SkRect r; + + r.set(left, top, right, bottom); + this->drawRect(r, paint); +} + +void SkCanvas::drawCircle(SkScalar cx, SkScalar cy, SkScalar radius, + const SkPaint& paint) { + if (radius < 0) { + radius = 0; + } + + SkRect r; + r.set(cx - radius, cy - radius, cx + radius, cy + radius); + this->drawOval(r, paint); +} + +void SkCanvas::drawRoundRect(const SkRect& r, SkScalar rx, SkScalar ry, + const SkPaint& paint) { + if (rx > 0 && ry > 0) { + if (paint.canComputeFastBounds()) { + SkRect storage; + if (this->quickReject(paint.computeFastBounds(r, &storage))) { + return; + } + } + SkRRect rrect; + rrect.setRectXY(r, rx, ry); + this->drawRRect(rrect, paint); + } else { + this->drawRect(r, paint); + } +} + +void SkCanvas::drawArc(const SkRect& oval, SkScalar startAngle, + SkScalar sweepAngle, bool useCenter, + const SkPaint& paint) { + if (SkScalarAbs(sweepAngle) >= SkIntToScalar(360)) { + this->drawOval(oval, paint); + } else { + SkPath path; + if (useCenter) { + path.moveTo(oval.centerX(), oval.centerY()); + } + path.arcTo(oval, startAngle, sweepAngle, !useCenter); + if (useCenter) { + path.close(); + } + this->drawPath(path, paint); + } +} + +void SkCanvas::drawTextOnPathHV(const void* text, size_t byteLength, + const SkPath& path, SkScalar hOffset, + SkScalar vOffset, const SkPaint& paint) { + SkMatrix matrix; + + matrix.setTranslate(hOffset, vOffset); + this->drawTextOnPath(text, byteLength, path, &matrix, paint); +} + +/////////////////////////////////////////////////////////////////////////////// +void SkCanvas::EXPERIMENTAL_optimize(SkPicture* picture) { + SkBaseDevice* device = this->getDevice(); + if (NULL != device) { + device->EXPERIMENTAL_optimize(picture); + } +} + +void SkCanvas::drawPicture(SkPicture& picture) { + SkBaseDevice* device = this->getTopDevice(); + if (NULL != device) { + // Canvas has to first give the device the opportunity to render + // the picture itself. + if (device->EXPERIMENTAL_drawPicture(picture)) { + return; // the device has rendered the entire picture + } + } + + picture.draw(this); +} + +/////////////////////////////////////////////////////////////////////////////// +/////////////////////////////////////////////////////////////////////////////// + +SkCanvas::LayerIter::LayerIter(SkCanvas* canvas, bool skipEmptyClips) { + SK_COMPILE_ASSERT(sizeof(fStorage) >= sizeof(SkDrawIter), fStorage_too_small); + + SkASSERT(canvas); + + fImpl = new (fStorage) SkDrawIter(canvas, skipEmptyClips); + fDone = !fImpl->next(); +} + +SkCanvas::LayerIter::~LayerIter() { + fImpl->~SkDrawIter(); +} + +void SkCanvas::LayerIter::next() { + fDone = !fImpl->next(); +} + +SkBaseDevice* SkCanvas::LayerIter::device() const { + return fImpl->getDevice(); +} + +const SkMatrix& SkCanvas::LayerIter::matrix() const { + return fImpl->getMatrix(); +} + +const SkPaint& SkCanvas::LayerIter::paint() const { + const SkPaint* paint = fImpl->getPaint(); + if (NULL == paint) { + paint = &fDefaultPaint; + } + return *paint; +} + +const SkRegion& SkCanvas::LayerIter::clip() const { return fImpl->getClip(); } +int SkCanvas::LayerIter::x() const { return fImpl->getX(); } +int SkCanvas::LayerIter::y() const { return fImpl->getY(); } + +/////////////////////////////////////////////////////////////////////////////// + +SkCanvas::ClipVisitor::~ClipVisitor() { } + +/////////////////////////////////////////////////////////////////////////////// + +static bool supported_for_raster_canvas(const SkImageInfo& info) { + switch (info.alphaType()) { + case kPremul_SkAlphaType: + case kOpaque_SkAlphaType: + break; + default: + return false; + } + + switch (info.colorType()) { + case kAlpha_8_SkColorType: + case kRGB_565_SkColorType: + case kPMColor_SkColorType: + break; + default: + return false; + } + + return true; +} + +SkCanvas* SkCanvas::NewRaster(const SkImageInfo& info) { + if (!supported_for_raster_canvas(info)) { + return NULL; + } + + SkBitmap bitmap; + if (!bitmap.allocPixels(info)) { + return NULL; + } + + // should this functionality be moved into allocPixels()? + if (!bitmap.info().isOpaque()) { + bitmap.eraseColor(0); + } + return SkNEW_ARGS(SkCanvas, (bitmap)); +} + +SkCanvas* SkCanvas::NewRasterDirect(const SkImageInfo& info, void* pixels, size_t rowBytes) { + if (!supported_for_raster_canvas(info)) { + return NULL; + } + + SkBitmap bitmap; + if (!bitmap.installPixels(info, pixels, rowBytes)) { + return NULL; + } + + // should this functionality be moved into allocPixels()? + if (!bitmap.info().isOpaque()) { + bitmap.eraseColor(0); + } + return SkNEW_ARGS(SkCanvas, (bitmap)); +}