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Unified Diff: src/core/SkCanvas.cpp

Issue 560713002: Revert of Revert of allow canvas to force conservative clips (for speed) (Closed) Base URL: https://skia.googlesource.com/skia.git@master
Patch Set: Created 6 years, 3 months ago
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Index: src/core/SkCanvas.cpp
diff --git a/src/core/SkCanvas.cpp b/src/core/SkCanvas.cpp
index 99786151abb150dd9500c46121079f1af43a5b81..62d60da178bd790582acdf5aba3c7db92791e0bb 100644
--- a/src/core/SkCanvas.cpp
+++ b/src/core/SkCanvas.cpp
@@ -81,9 +81,12 @@
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 (device) {
+ DeviceCM(SkBaseDevice* device, int x, int y, const SkPaint* paint, SkCanvas* canvas,
+ bool conservativeRasterClip)
+ : fNext(NULL)
+ , fClip(conservativeRasterClip)
+ {
+ if (NULL != device) {
device->ref();
device->onAttachToCanvas(canvas);
}
@@ -151,11 +154,10 @@
*/
class SkCanvas::MCRec {
public:
+ SkRasterClip fRasterClip;
SkMatrix fMatrix;
- SkRasterClip fRasterClip;
SkDrawFilter* fFilter; // the current filter (or null)
-
- DeviceCM* fLayer;
+ 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
@@ -164,22 +166,21 @@
*/
DeviceCM* fTopLayer;
- MCRec(const MCRec* prev) {
- if (prev) {
- fMatrix = prev->fMatrix;
- fRasterClip = prev->fRasterClip;
-
- fFilter = prev->fFilter;
- SkSafeRef(fFilter);
-
- fTopLayer = prev->fTopLayer;
- } else { // no prev
- fMatrix.reset();
- fFilter = NULL;
- fTopLayer = NULL;
- }
+ MCRec(bool conservativeRasterClip) : fRasterClip(conservativeRasterClip) {
+ fMatrix.reset();
+ fFilter = NULL;
+ fLayer = NULL;
+ fTopLayer = NULL;
+
+ // don't bother initializing fNext
+ inc_rec();
+ }
+ MCRec(const MCRec& prev) : fRasterClip(prev.fRasterClip) {
+ fMatrix = prev.fMatrix;
+ fFilter = SkSafeRef(prev.fFilter);
fLayer = NULL;
-
+ fTopLayer = prev.fTopLayer;
+
// don't bother initializing fNext
inc_rec();
}
@@ -381,7 +382,8 @@
////////////////////////////////////////////////////////////////////////////
-SkBaseDevice* SkCanvas::init(SkBaseDevice* device) {
+SkBaseDevice* SkCanvas::init(SkBaseDevice* device, InitFlags flags) {
+ fConservativeRasterClip = SkToBool(flags & kConservativeRasterClip_InitFlag);
fCachedLocalClipBounds.setEmpty();
fCachedLocalClipBoundsDirty = true;
fAllowSoftClip = true;
@@ -391,10 +393,14 @@
fCullCount = 0;
fMetaData = NULL;
+ if (device && device->forceConservativeRasterClip()) {
+ fConservativeRasterClip = true;
+ }
+
fMCRec = (MCRec*)fMCStack.push_back();
- new (fMCRec) MCRec(NULL);
-
- fMCRec->fLayer = SkNEW_ARGS(DeviceCM, (NULL, 0, 0, NULL, NULL));
+ new (fMCRec) MCRec(fConservativeRasterClip);
+
+ fMCRec->fLayer = SkNEW_ARGS(DeviceCM, (NULL, 0, 0, NULL, NULL, fConservativeRasterClip));
fMCRec->fTopLayer = fMCRec->fLayer;
fSurfaceBase = NULL;
@@ -412,25 +418,54 @@
{
inc_canvas();
- this->init(NULL);
-}
+ this->init(NULL, kDefault_InitFlags);
+}
+
+static SkBitmap make_nopixels(int width, int height) {
+ SkBitmap bitmap;
+ bitmap.setInfo(SkImageInfo::MakeUnknown(width, height));
+ return bitmap;
+}
+
+class SkNoPixelsBitmapDevice : public SkBitmapDevice {
+public:
+ SkNoPixelsBitmapDevice(int width, int height) : INHERITED(make_nopixels(width, height)) {}
+
+private:
+
+ typedef SkBitmapDevice INHERITED;
+};
SkCanvas::SkCanvas(int width, int height)
: fMCStack(sizeof(MCRec), fMCRecStorage, sizeof(fMCRecStorage))
{
inc_canvas();
-
- SkBitmap bitmap;
- bitmap.setInfo(SkImageInfo::MakeUnknown(width, height));
- this->init(SkNEW_ARGS(SkBitmapDevice, (bitmap)))->unref();
+
+ this->init(SkNEW_ARGS(SkNoPixelsBitmapDevice, (width, height)), kDefault_InitFlags)->unref();
+}
+
+SkCanvas::SkCanvas(int width, int height, InitFlags flags)
+ : fMCStack(sizeof(MCRec), fMCRecStorage, sizeof(fMCRecStorage))
+{
+ inc_canvas();
+
+ this->init(SkNEW_ARGS(SkNoPixelsBitmapDevice, (width, height)), flags)->unref();
+}
+
+SkCanvas::SkCanvas(SkBaseDevice* device, InitFlags flags)
+ : fMCStack(sizeof(MCRec), fMCRecStorage, sizeof(fMCRecStorage))
+{
+ inc_canvas();
+
+ this->init(device, flags);
}
SkCanvas::SkCanvas(SkBaseDevice* device)
: fMCStack(sizeof(MCRec), fMCRecStorage, sizeof(fMCRecStorage))
{
inc_canvas();
-
- this->init(device);
+
+ this->init(device, kDefault_InitFlags);
}
SkCanvas::SkCanvas(const SkBitmap& bitmap)
@@ -438,7 +473,7 @@
{
inc_canvas();
- this->init(SkNEW_ARGS(SkBitmapDevice, (bitmap)))->unref();
+ this->init(SkNEW_ARGS(SkBitmapDevice, (bitmap)), kDefault_InitFlags)->unref();
}
SkCanvas::~SkCanvas() {
@@ -734,7 +769,7 @@
int saveCount = this->getSaveCount(); // record this before the actual save
MCRec* newTop = (MCRec*)fMCStack.push_back();
- new (newTop) MCRec(fMCRec); // balanced in restore()
+ new (newTop) MCRec(*fMCRec); // balanced in restore()
fMCRec = newTop;
fClipStack.save();
@@ -866,7 +901,8 @@
}
device->setOrigin(ir.fLeft, ir.fTop);
- DeviceCM* layer = SkNEW_ARGS(DeviceCM, (device, ir.fLeft, ir.fTop, paint, this));
+ DeviceCM* layer = SkNEW_ARGS(DeviceCM,
+ (device, ir.fLeft, ir.fTop, paint, this, fConservativeRasterClip));
device->unref();
layer->fNext = fMCRec->fTopLayer;
@@ -1286,7 +1322,7 @@
fMCRec->fMatrix.mapRect(&r, rect);
fClipStack.clipDevRect(r, op, kSoft_ClipEdgeStyle == edgeStyle);
- fMCRec->fRasterClip.op(r, op, kSoft_ClipEdgeStyle == edgeStyle);
+ fMCRec->fRasterClip.op(r, this->getBaseLayerSize(), 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
@@ -1421,82 +1457,6 @@
rasterclip_path(&fMCRec->fRasterClip, this, 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);
-
- // set the clip in device space
- SkMatrix savedMatrix = this->getTotalMatrix();
- this->SkCanvas::setMatrix(SkMatrix::I());
- this->SkCanvas::onClipRect(deviceBounds, SkRegion::kReplace_Op,
- kHard_ClipEdgeStyle);
- this->setMatrix(savedMatrix);
- 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);
}
@@ -1525,7 +1485,7 @@
SkIRect ir;
ir.set(0, 0, device->width(), device->height());
- SkRasterClip tmpClip(ir);
+ SkRasterClip tmpClip(ir, fConservativeRasterClip);
SkClipStack::B2TIter iter(fClipStack);
const SkClipStack::Element* element;
@@ -1569,7 +1529,6 @@
}
bool SkCanvas::quickReject(const SkRect& rect) const {
-
if (!rect.isFinite())
return true;
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