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android / platform / external / chromium_org / third_party / skia / src / 3fc092543559b6819a64c8f66c5bf6e23e2d4069 / . / core / SkCanvas.cpp
blob: 47d3cca81edc8ee2c5acf3f469187e3fec51fdb1 [file] [log] [blame]
/*
* 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 "SkScalarCompare.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<SkPaint> 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:
MCRec* fNext;
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) : fOrigPaint(paint) {
fCanvas = canvas;
fLooper = paint.getLooper();
fFilter = canvas->getDrawFilter();
fPaint = NULL;
fSaveCount = canvas->getSaveCount();
fDoClearImageFilter = false;
fDone = false;
if (!skipLayerForImageFilter && fOrigPaint.getImageFilter()) {
SkPaint tmp;
tmp.setImageFilter(fOrigPaint.getImageFilter());
// it would be nice if we had a guess at the bounds, instead of null
(void)canvas->internalSaveLayer(NULL, &tmp,
SkCanvas::kARGB_ClipLayer_SaveFlag, true);
// we'll clear the imageFilter for the actual draws in next(), so
// it will only be applied during the restore().
fDoClearImageFilter = true;
}
if (fLooper) {
fLooper->init(canvas);
fIsSimple = false;
} else {
// 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;
SkDrawLooper* fLooper;
SkDrawFilter* fFilter;
const SkPaint* fPaint;
int fSaveCount;
bool fDoClearImageFilter;
bool fDone;
bool fIsSimple;
bool doNext(SkDrawFilter::Type drawType);
};
bool AutoDrawLooper::doNext(SkDrawFilter::Type drawType) {
fPaint = NULL;
SkASSERT(!fIsSimple);
SkASSERT(fLooper || fFilter || fDoClearImageFilter);
SkPaint* paint = fLazyPaint.set(fOrigPaint);
if (fDoClearImageFilter) {
paint->setImageFilter(NULL);
}
if (fLooper && !fLooper->next(fCanvas, paint)) {
fDone = true;
return false;
}
if (fFilter) {
if (!fFilter->filter(paint, drawType)) {
fDone = true;
return false;
}
if (NULL == fLooper) {
// 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 (!fLooper && !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) \
this->predrawNotify(); \
AutoDrawLooper looper(this, paint); \
while (looper.next(type)) { \
SkAutoBounderCommit ac(fBounder); \
SkDrawIter iter(this);
#define LOOPER_END }
////////////////////////////////////////////////////////////////////////////
SkBaseDevice* SkCanvas::init(SkBaseDevice* device) {
fBounder = NULL;
fLocalBoundsCompareType.setEmpty();
fLocalBoundsCompareTypeDirty = true;
fAllowSoftClip = true;
fAllowSimplifyClip = false;
fDeviceCMDirty = false;
fSaveLayerCount = 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;
fMCRec->fNext = NULL;
fSurfaceBase = NULL;
return this->setDevice(device);
}
SkCanvas::SkCanvas()
: fMCStack(sizeof(MCRec), fMCRecStorage, sizeof(fMCRecStorage)) {
inc_canvas();
this->init(NULL);
}
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::getDeviceSize() 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<SkCanvas*>(this)->updateDeviceCMCache();
}
return fMCRec->fTopLayer->fDevice;
}
SkBaseDevice* SkCanvas::setDevice(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;
}
}
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);
}
}
}
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()
newTop->fNext = fMCRec;
fMCRec = newTop;
if (SkCanvas::kClip_SaveFlag & flags) {
fClipStack.save();
}
return saveCount;
}
int SkCanvas::save(SaveFlags flags) {
// call shared impl
return this->internalSave(flags);
}
#define C32MASK (1 << SkBitmap::kARGB_8888_Config)
#define C16MASK (1 << SkBitmap::kRGB_565_Config)
#define C8MASK (1 << SkBitmap::kA8_Config)
static SkBitmap::Config resolve_config(SkCanvas* canvas,
const SkIRect& bounds,
SkCanvas::SaveFlags flags,
bool* isOpaque) {
*isOpaque = (flags & SkCanvas::kHasAlphaLayer_SaveFlag) == 0;
#if 0
// loop through and union all the configs we may draw into
uint32_t configMask = 0;
for (int i = canvas->countLayerDevices() - 1; i >= 0; --i)
{
SkBaseDevice* device = canvas->getLayerDevice(i);
if (device->intersects(bounds))
configMask |= 1 << device->config();
}
// if the caller wants alpha or fullcolor, we can't return 565
if (flags & (SkCanvas::kFullColorLayer_SaveFlag |
SkCanvas::kHasAlphaLayer_SaveFlag))
configMask &= ~C16MASK;
switch (configMask) {
case C8MASK: // if we only have A8, return that
return SkBitmap::kA8_Config;
case C16MASK: // if we only have 565, return that
return SkBitmap::kRGB_565_Config;
default:
return SkBitmap::kARGB_8888_Config; // default answer
}
#else
return SkBitmap::kARGB_8888_Config; // default answer
#endif
}
static bool bounds_affects_clip(SkCanvas::SaveFlags flags) {
return (flags & SkCanvas::kClipToLayer_SaveFlag) != 0;
}
bool SkCanvas::clipRectBounds(const SkRect* bounds, SaveFlags flags,
SkIRect* intersection) {
SkIRect clipBounds;
if (!this->getClipDeviceBounds(&clipBounds)) {
return false;
}
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;
}
fClipStack.clipDevRect(ir, SkRegion::kIntersect_Op);
// early exit if the clip is now empty
if (bounds_affects_clip(flags) &&
!fMCRec->fRasterClip->op(ir, SkRegion::kIntersect_Op)) {
return false;
}
if (intersection) {
*intersection = ir;
}
return true;
}
int SkCanvas::saveLayer(const SkRect* bounds, const SkPaint* paint,
SaveFlags flags) {
return this->internalSaveLayer(bounds, paint, flags, false);
}
int SkCanvas::internalSaveLayer(const SkRect* bounds, const SkPaint* paint,
SaveFlags flags, bool justForImageFilter) {
// 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)) {
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;
SkBitmap::Config config = resolve_config(this, ir, flags, &isOpaque);
SkBaseDevice* device;
if (paint && paint->getImageFilter()) {
device = this->createCompatibleDevice(config, ir.width(), ir.height(),
isOpaque);
} else {
device = this->createLayerDevice(config, ir.width(), ir.height(),
isOpaque);
}
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::restore() {
// check for underflow
if (fMCStack.count() > 1) {
this->internalRestore();
}
}
void SkCanvas::internalRestore() {
SkASSERT(fMCStack.count() != 0);
fDeviceCMDirty = true;
fLocalBoundsCompareTypeDirty = 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;
}
/////////////////////////////////////////////////////////////////////////////
// can't draw it if its empty, or its too big for a fixed-point width or height
static bool reject_bitmap(const SkBitmap& bitmap) {
return bitmap.width() <= 0 || bitmap.height() <= 0;
}
void SkCanvas::internalDrawBitmap(const SkBitmap& bitmap,
const SkMatrix& matrix, const SkPaint* paint) {
if (reject_bitmap(bitmap)) {
return;
}
SkLazyPaint lazy;
if (NULL == paint) {
paint = lazy.init();
}
SkDEBUGCODE(bitmap.validate();)
CHECK_LOCKCOUNT_BALANCE(bitmap);
LOOPER_BEGIN(*paint, SkDrawFilter::kBitmap_Type)
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;
const SkBitmap& src = srcDev->accessBitmap(false);
SkMatrix matrix = *iter.fMatrix;
matrix.postTranslate(SkIntToScalar(-x), SkIntToScalar(-y));
if (filter->filterImage(&proxy, src, matrix, &dst, &pos)) {
SkPaint tmpUnfiltered(*paint);
tmpUnfiltered.setImageFilter(NULL);
dstDev->drawSprite(iter, dst, pos.x(), pos.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) {
SkDEBUGCODE(bitmap.validate();)
CHECK_LOCKCOUNT_BALANCE(bitmap);
if (reject_bitmap(bitmap)) {
return;
}
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;
SkMatrix matrix = *iter.fMatrix;
matrix.postTranslate(SkIntToScalar(-x), SkIntToScalar(-y));
if (filter->filterImage(&proxy, bitmap, matrix, &dst, &pos)) {
SkPaint tmpUnfiltered(*paint);
tmpUnfiltered.setImageFilter(NULL);
iter.fDevice->drawSprite(iter, dst, pos.x(), pos.y(),
tmpUnfiltered);
}
} else {
iter.fDevice->drawSprite(iter, bitmap, pos.x(), pos.y(), *paint);
}
}
LOOPER_END
}
/////////////////////////////////////////////////////////////////////////////
bool SkCanvas::translate(SkScalar dx, SkScalar dy) {
fDeviceCMDirty = true;
fLocalBoundsCompareTypeDirty = true;
return fMCRec->fMatrix->preTranslate(dx, dy);
}
bool SkCanvas::scale(SkScalar sx, SkScalar sy) {
fDeviceCMDirty = true;
fLocalBoundsCompareTypeDirty = true;
return fMCRec->fMatrix->preScale(sx, sy);
}
bool SkCanvas::rotate(SkScalar degrees) {
fDeviceCMDirty = true;
fLocalBoundsCompareTypeDirty = true;
return fMCRec->fMatrix->preRotate(degrees);
}
bool SkCanvas::skew(SkScalar sx, SkScalar sy) {
fDeviceCMDirty = true;
fLocalBoundsCompareTypeDirty = true;
return fMCRec->fMatrix->preSkew(sx, sy);
}
bool SkCanvas::concat(const SkMatrix& matrix) {
fDeviceCMDirty = true;
fLocalBoundsCompareTypeDirty = true;
return fMCRec->fMatrix->preConcat(matrix);
}
void SkCanvas::setMatrix(const SkMatrix& matrix) {
fDeviceCMDirty = true;
fLocalBoundsCompareTypeDirty = true;
*fMCRec->fMatrix = matrix;
}
// this is not virtual, so it must call a virtual method so that subclasses
// will see its action
void SkCanvas::resetMatrix() {
SkMatrix matrix;
matrix.reset();
this->setMatrix(matrix);
}
//////////////////////////////////////////////////////////////////////////////
bool SkCanvas::clipRect(const SkRect& rect, SkRegion::Op op, bool doAA) {
#ifdef SK_ENABLE_CLIP_QUICKREJECT
if (SkRegion::kIntersect_Op == op) {
if (fMCRec->fRasterClip->isEmpty()) {
return false;
}
if (this->quickReject(rect)) {
fDeviceCMDirty = true;
fLocalBoundsCompareTypeDirty = true;
fClipStack.clipEmpty();
return fMCRec->fRasterClip->setEmpty();
}
}
#endif
AutoValidateClip avc(this);
fDeviceCMDirty = true;
fLocalBoundsCompareTypeDirty = true;
doAA &= fAllowSoftClip;
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, doAA);
return fMCRec->fRasterClip->op(r, op, doAA);
} 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);
return this->SkCanvas::clipPath(path, op, doAA);
}
}
static bool clipPathHelper(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.
return currClip->setPath(devPath, currClip->bwRgn(), doAA);
} else {
base.setRect(currClip->getBounds());
SkRasterClip clip;
clip.setPath(devPath, base, doAA);
return currClip->op(clip, op);
}
} else {
const SkBaseDevice* device = canvas->getDevice();
if (!device) {
return currClip->setEmpty();
}
base.setRect(0, 0, device->width(), device->height());
if (SkRegion::kReplace_Op == op) {
return currClip->setPath(devPath, base, doAA);
} else {
SkRasterClip clip;
clip.setPath(devPath, base, doAA);
return currClip->op(clip, op);
}
}
}
bool SkCanvas::clipRRect(const SkRRect& rrect, SkRegion::Op op, bool doAA) {
if (rrect.isRect()) {
// call the non-virtual version
return this->SkCanvas::clipRect(rrect.getBounds(), op, doAA);
} else {
SkPath path;
path.addRRect(rrect);
// call the non-virtual version
return this->SkCanvas::clipPath(path, op, doAA);
}
}
bool SkCanvas::clipPath(const SkPath& path, SkRegion::Op op, bool doAA) {
#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;
fLocalBoundsCompareTypeDirty = true;
fClipStack.clipEmpty();
return fMCRec->fRasterClip->setEmpty();
}
}
#endif
AutoValidateClip avc(this);
fDeviceCMDirty = true;
fLocalBoundsCompareTypeDirty = true;
doAA &= fAllowSoftClip;
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, doAA);
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;
if (type == SkClipStack::Element::kRect_Type) {
operand.addRect(element->getRect());
} else if (type == SkClipStack::Element::kPath_Type) {
operand = element->getPath();
} else {
SkDEBUGFAIL("Unexpected type.");
}
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.
doAA |= element->isAA();
}
op = SkRegion::kReplace_Op;
}
return clipPathHelper(this, fMCRec->fRasterClip, devPath, op, doAA);
}
bool 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 unchanges conservatively respects the contract.
return this->getClipDeviceBounds(NULL);
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());
bool result = this->SkCanvas::clipRect(deviceBounds,
SkRegion::kReplace_Op, false);
this->SkCanvas::restore(); //pop the matrix, but keep the clip
return result;
}
default:
SkASSERT(0); // unhandled op?
}
} else {
// Not inverse filled
switch (op) {
case SkRegion::kIntersect_Op:
case SkRegion::kUnion_Op:
case SkRegion::kReplace_Op:
return this->SkCanvas::clipRect(bounds, op, false);
case SkRegion::kDifference_Op:
// Difference can only shrink the current clip.
// Leaving clip unchanged conservatively fullfills the contract.
return this->getClipDeviceBounds(NULL);
case SkRegion::kReverseDifference_Op:
// To reverse, we swap in the bounds with a replace op.
// As with difference, leave it unchanged.
return this->SkCanvas::clipRect(bounds, SkRegion::kReplace_Op, false);
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))
return this->SkCanvas::clipRect(bounds, SkRegion::kUnion_Op, false);
default:
SkASSERT(0); // unhandled op?
}
}
return true;
}
bool SkCanvas::clipRegion(const SkRegion& rgn, SkRegion::Op op) {
AutoValidateClip avc(this);
fDeviceCMDirty = true;
fLocalBoundsCompareTypeDirty = 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);
return 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->getTotalClip().isEmpty());
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::kPath_Type:
clipPathHelper(this,
&tmpClip,
element->getPath(),
element->getOp(),
element->isAA());
break;
case SkClipStack::Element::kRect_Type:
element->getRect().round(&ir);
tmpClip.op(ir, element->getOp());
break;
case SkClipStack::Element::kEmpty_Type:
tmpClip.setEmpty();
break;
}
}
#if 0 // enable this locally for testing
// now compare against the current rgn
const SkRegion& rgn = this->getTotalClip();
SkASSERT(rgn == tmpClip);
#endif
}
#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::kRect_Type:
visitor->clipRect(element->getRect(), element->getOp(), element->isAA());
break;
case SkClipStack::Element::kEmpty_Type:
visitor->clipRect(kEmpty, SkRegion::kIntersect_Op, false);
break;
}
}
}
///////////////////////////////////////////////////////////////////////////////
void SkCanvas::computeLocalClipBoundsCompareType() const {
SkRect r;
if (!this->getClipBounds(&r)) {
fLocalBoundsCompareType.setEmpty();
} else {
fLocalBoundsCompareType.set(SkScalarToCompareType(r.fLeft),
SkScalarToCompareType(r.fTop),
SkScalarToCompareType(r.fRight),
SkScalarToCompareType(r.fBottom));
}
}
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 SkRectCompareType& clipR = this->getLocalClipBoundsCompareType();
// for speed, do the most likely reject compares first
SkScalarCompareType userT = SkScalarToCompareType(rect.fTop);
SkScalarCompareType userB = SkScalarToCompareType(rect.fBottom);
if (userT >= clipR.fBottom || userB <= clipR.fTop) {
return true;
}
SkScalarCompareType userL = SkScalarToCompareType(rect.fLeft);
SkScalarCompareType userR = SkScalarToCompareType(rect.fRight);
if (userL >= clipR.fRight || userR <= clipR.fLeft) {
return true;
}
return false;
}
}
bool SkCanvas::quickReject(const SkPath& path) const {
return path.isEmpty() || this->quickReject(path.getBounds());
}
static inline int pinIntForScalar(int x) {
#ifdef SK_SCALAR_IS_FIXED
if (x < SK_MinS16) {
x = SK_MinS16;
} else if (x > SK_MaxS16) {
x = SK_MaxS16;
}
#endif
return x;
}
bool SkCanvas::getClipBounds(SkRect* bounds) const {
SkIRect ibounds;
if (!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;
// SkRect::iset() will correctly assert if we pass a value out of range
// (when SkScalar==fixed), so we pin to legal values. This does not
// really returnt the correct answer, but its the best we can do given
// that we've promised to return SkRect (even though we support devices
// that can be larger than 32K in width or height).
r.iset(pinIntForScalar(ibounds.fLeft - inset),
pinIntForScalar(ibounds.fTop - inset),
pinIntForScalar(ibounds.fRight + inset),
pinIntForScalar(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;
}
SkCanvas::ClipType SkCanvas::getClipType() const {
if (fMCRec->fRasterClip->isEmpty()) return kEmpty_ClipType;
if (fMCRec->fRasterClip->isRect()) return kRect_ClipType;
return kComplex_ClipType;
}
const SkRegion& SkCanvas::getTotalClip() const {
return fMCRec->fRasterClip->forceGetBW();
}
SkBaseDevice* SkCanvas::createLayerDevice(SkBitmap::Config config,
int width, int height,
bool isOpaque) {
SkBaseDevice* device = this->getTopDevice();
if (device) {
return device->createCompatibleDeviceForSaveLayer(config, width, height,
isOpaque);
} else {
return NULL;
}
}
SkBaseDevice* SkCanvas::createCompatibleDevice(SkBitmap::Config config,
int width, int height,
bool isOpaque) {
SkBaseDevice* device = this->getDevice();
if (device) {
return device->createCompatibleDevice(config, width, height, isOpaque);
} else {
return 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;
}
//////////////////////////////////////////////////////////////////////////////
// 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)
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);
if (paint.canComputeFastBounds()) {
SkRect r;
// special-case 2 points (common for drawing a single line)
if (2 == count) {
r.set(pts[0], pts[1]);
} else {
r.set(pts, count);
}
SkRect storage;
if (this->quickReject(paint.computeFastStrokeBounds(r, &storage))) {
return;
}
}
SkASSERT(pts != NULL);
LOOPER_BEGIN(paint, SkDrawFilter::kPoint_Type)
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);
if (paint.canComputeFastBounds()) {
SkRect storage;
if (this->quickReject(paint.computeFastBounds(r, &storage))) {
return;
}
}
LOOPER_BEGIN(paint, SkDrawFilter::kRect_Type)
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);
if (paint.canComputeFastBounds()) {
SkRect storage;
if (this->quickReject(paint.computeFastBounds(oval, &storage))) {
return;
}
}
LOOPER_BEGIN(paint, SkDrawFilter::kOval_Type)
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);
if (paint.canComputeFastBounds()) {
SkRect storage;
if (this->quickReject(paint.computeFastBounds(rrect.getBounds(), &storage))) {
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)
while (iter.next()) {
iter.fDevice->drawRRect(iter, rrect, looper.paint());
}
LOOPER_END
}
void SkCanvas::drawPath(const SkPath& path, const SkPaint& paint) {
CHECK_SHADER_NOSETCONTEXT(paint);
if (!path.isFinite()) {
return;
}
if (!path.isInverseFillType() && paint.canComputeFastBounds()) {
SkRect storage;
const SkRect& bounds = path.getBounds();
if (this->quickReject(paint.computeFastBounds(bounds, &storage))) {
return;
}
}
if (path.isEmpty()) {
if (path.isInverseFillType()) {
this->internalDrawPaint(paint);
}
return;
}
LOOPER_BEGIN(paint, SkDrawFilter::kPath_Type)
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.width() == 0 || bitmap.height() == 0 || dst.isEmpty()) {
return;
}
CHECK_LOCKCOUNT_BALANCE(bitmap);
if (NULL == paint || paint->canComputeFastBounds()) {
SkRect storage;
const SkRect* bounds = &dst;
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)
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 (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)
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<const char*>(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)
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)
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)
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)
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::drawPicture(SkPicture& 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() { }