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/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrContext.h"
#include "GrLayerCache.h"
#include "GrRecordReplaceDraw.h"
#include "SkBigPicture.h"
#include "SkCanvasPriv.h"
#include "SkGrPixelRef.h"
#include "SkImage.h"
#include "SkRecordDraw.h"
#include "SkRecords.h"
static inline void wrap_texture(GrTexture* texture, int width, int height, SkBitmap* result) {
SkImageInfo info = SkImageInfo::MakeN32Premul(width, height);
result->setInfo(info);
result->setPixelRef(new SkGrPixelRef(info, texture))->unref();
}
static inline void draw_replacement_bitmap(GrCachedLayer* layer, SkCanvas* canvas) {
// Some image filter can totally filter away a layer (e.g., SkPictureImageFilter's with
// no picture).
if (!layer->texture()) {
return;
}
SkBitmap bm;
wrap_texture(layer->texture(),
!layer->isAtlased() ? layer->rect().width() : layer->texture()->width(),
!layer->isAtlased() ? layer->rect().height() : layer->texture()->height(),
&bm);
if (layer->isAtlased()) {
const SkRect src = SkRect::Make(layer->rect());
const SkRect dst = SkRect::Make(layer->srcIR());
SkASSERT(layer->offset().isZero());
canvas->save();
canvas->setMatrix(SkMatrix::I());
canvas->drawBitmapRect(bm, src, dst, layer->paint(), SkCanvas::kStrict_SrcRectConstraint);
canvas->restore();
} else {
canvas->drawSprite(bm,
layer->srcIR().fLeft + layer->offset().fX,
layer->srcIR().fTop + layer->offset().fY,
layer->paint());
}
}
// Used by GrRecordReplaceDraw. It intercepts nested drawPicture calls and
// also draws them with replaced layers.
class ReplaceDraw : public SkRecords::Draw {
public:
ReplaceDraw(SkCanvas* canvas, GrLayerCache* layerCache,
SkPicture const* const drawablePicts[], int drawableCount,
const SkPicture* topLevelPicture,
const SkBigPicture* picture,
const SkMatrix& initialMatrix,
SkPicture::AbortCallback* callback,
const int* opIndices, int numIndices)
: INHERITED(canvas, drawablePicts, nullptr, drawableCount)
, fCanvas(canvas)
, fLayerCache(layerCache)
, fTopLevelPicture(topLevelPicture)
, fPicture(picture)
, fInitialMatrix(initialMatrix)
, fCallback(callback)
, fIndex(0)
, fNumReplaced(0) {
fOpIndexStack.append(numIndices, opIndices);
}
int draw() {
const SkBBoxHierarchy* bbh = fPicture->bbh();
const SkRecord* record = fPicture->record();
if (nullptr == record) {
return 0;
}
fNumReplaced = 0;
fOps.rewind();
if (bbh) {
// Draw only ops that affect pixels in the canvas's current clip.
// The SkRecord and BBH were recorded in identity space. This canvas
// is not necessarily in that same space. getClipBounds() returns us
// this canvas' clip bounds transformed back into identity space, which
// lets us query the BBH.
SkRect query = { 0, 0, 0, 0 };
(void)fCanvas->getClipBounds(&query);
bbh->search(query, &fOps);
for (fIndex = 0; fIndex < fOps.count(); ++fIndex) {
if (fCallback && fCallback->abort()) {
return fNumReplaced;
}
record->visit<void>(fOps[fIndex], *this);
}
} else {
for (fIndex = 0; fIndex < (int) record->count(); ++fIndex) {
if (fCallback && fCallback->abort()) {
return fNumReplaced;
}
record->visit<void>(fIndex, *this);
}
}
return fNumReplaced;
}
// Same as Draw for all ops except DrawPicture and SaveLayer.
template <typename T> void operator()(const T& r) {
this->INHERITED::operator()(r);
}
void operator()(const SkRecords::DrawPicture& dp) {
int drawPictureOffset;
if (fOps.count()) {
drawPictureOffset = fOps[fIndex];
} else {
drawPictureOffset = fIndex;
}
fOpIndexStack.push(drawPictureOffset);
SkAutoCanvasMatrixPaint acmp(fCanvas, &dp.matrix, dp.paint, dp.picture->cullRect());
if (const SkBigPicture* bp = dp.picture->asSkBigPicture()) {
// Draw sub-pictures with the same replacement list but a different picture
ReplaceDraw draw(fCanvas, fLayerCache,
this->drawablePicts(), this->drawableCount(),
fTopLevelPicture, bp, fInitialMatrix, fCallback,
fOpIndexStack.begin(), fOpIndexStack.count());
fNumReplaced += draw.draw();
} else {
// TODO: can we assume / assert this doesn't happen?
dp.picture->playback(fCanvas, fCallback);
}
fOpIndexStack.pop();
}
void operator()(const SkRecords::SaveLayer& sl) {
// For a saveLayer command, check if it can be replaced by a drawBitmap
// call and, if so, draw it and then update the current op index accordingly.
int startOffset;
if (fOps.count()) {
startOffset = fOps[fIndex];
} else {
startOffset = fIndex;
}
fOpIndexStack.push(startOffset);
GrCachedLayer* layer = fLayerCache->findLayer(fTopLevelPicture->uniqueID(),
fInitialMatrix,
fOpIndexStack.begin(),
fOpIndexStack.count());
if (layer) {
fNumReplaced++;
draw_replacement_bitmap(layer, fCanvas);
if (fPicture->bbh()) {
while (fOps[fIndex] < layer->stop()) {
++fIndex;
}
SkASSERT(fOps[fIndex] == layer->stop());
} else {
fIndex = layer->stop();
}
fOpIndexStack.pop();
return;
}
// This is a fail for layer hoisting
this->INHERITED::operator()(sl);
fOpIndexStack.pop();
}
private:
SkCanvas* fCanvas;
GrLayerCache* fLayerCache;
const SkPicture* fTopLevelPicture;
const SkBigPicture* fPicture;
const SkMatrix fInitialMatrix;
SkPicture::AbortCallback* fCallback;
SkTDArray<int> fOps;
int fIndex;
int fNumReplaced;
// The op code indices of all the enclosing drawPicture and saveLayer calls
SkTDArray<int> fOpIndexStack;
typedef Draw INHERITED;
};
int GrRecordReplaceDraw(const SkPicture* picture,
SkCanvas* canvas,
GrLayerCache* layerCache,
const SkMatrix& initialMatrix,
SkPicture::AbortCallback* callback) {
SkAutoCanvasRestore saveRestore(canvas, true /*save now, restore at exit*/);
if (const SkBigPicture* bp = picture->asSkBigPicture()) {
// TODO: drawablePicts?
ReplaceDraw draw(canvas, layerCache, nullptr, 0,
bp, bp,
initialMatrix, callback, nullptr, 0);
return draw.draw();
} else {
// TODO: can we assume / assert this doesn't happen?
picture->playback(canvas, callback);
return 0;
}
}
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