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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 "GrRecordReplaceDraw.h"
#include "SkCanvasPriv.h"
#include "SkImage.h"
#include "SkRecordDraw.h"
#include "SkRecords.h"
GrReplacements::ReplacementInfo* GrReplacements::newReplacement(uint32_t pictureID,
unsigned int start,
const SkMatrix& ctm) {
ReplacementInfo* replacement = SkNEW_ARGS(ReplacementInfo, (pictureID, start, ctm));
fReplacementHash.add(replacement);
return replacement;
}
void GrReplacements::freeAll() {
SkTDynamicHash<ReplacementInfo, ReplacementInfo::Key>::Iter iter(&fReplacementHash);
for (; !iter.done(); ++iter) {
ReplacementInfo* replacement = &(*iter);
SkDELETE(replacement);
}
fReplacementHash.reset();
}
const GrReplacements::ReplacementInfo* GrReplacements::lookupByStart(uint32_t pictureID,
size_t start,
const SkMatrix& ctm) const {
return fReplacementHash.find(ReplacementInfo::Key(pictureID, start, ctm));
}
static inline void draw_replacement_bitmap(const GrReplacements::ReplacementInfo* ri,
SkCanvas* canvas,
const SkMatrix& initialMatrix) {
SkRect src = SkRect::Make(ri->fSrcRect);
SkRect dst = SkRect::MakeXYWH(SkIntToScalar(ri->fPos.fX),
SkIntToScalar(ri->fPos.fY),
SkIntToScalar(ri->fSrcRect.width()),
SkIntToScalar(ri->fSrcRect.height()));
canvas->save();
canvas->setMatrix(initialMatrix);
canvas->drawImageRect(ri->fImage, &src, dst, ri->fPaint);
canvas->restore();
}
// Used by GrRecordReplaceDraw. It intercepts nested drawPicture calls and
// also draws them with replaced layers.
class ReplaceDraw : public SkRecords::Draw {
public:
ReplaceDraw(SkCanvas* canvas,
const SkPicture* picture,
const GrReplacements* replacements,
const SkMatrix& initialMatrix,
SkDrawPictureCallback* callback)
: INHERITED(canvas)
, fCanvas(canvas)
, fPicture(picture)
, fReplacements(replacements)
, fInitialMatrix(initialMatrix)
, fCallback(callback)
, fIndex(0) {
}
void draw() {
const SkBBoxHierarchy* bbh = fPicture->fBBH.get();
const SkRecord* record = fPicture->fRecord.get();
if (NULL == record) {
return;
}
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->abortDrawing()) {
return;
}
record->visit<void>(fOps[fIndex], *this);
}
} else {
for (fIndex = 0; fIndex < (int) record->count(); ++fIndex) {
if (fCallback && fCallback->abortDrawing()) {
return;
}
record->visit<void>(fIndex, *this);
}
}
}
// 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) {
SkAutoCanvasMatrixPaint acmp(fCanvas, dp.matrix, dp.paint, dp.picture->cullRect());
// Draw sub-pictures with the same replacement list but a different picture
ReplaceDraw draw(fCanvas, dp.picture, fReplacements, fInitialMatrix, fCallback);
draw.draw();
}
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.
size_t startOffset;
if (fOps.count()) {
startOffset = fOps[fIndex];
} else {
startOffset = fIndex;
}
const GrReplacements::ReplacementInfo* ri = fReplacements->lookupByStart(
fPicture->uniqueID(),
startOffset,
fCanvas->getTotalMatrix());
if (ri) {
draw_replacement_bitmap(ri, fCanvas, fInitialMatrix);
if (fPicture->fBBH.get()) {
while (fOps[fIndex] < ri->fStop) {
++fIndex;
}
SkASSERT(fOps[fIndex] == ri->fStop);
} else {
fIndex = ri->fStop;
}
return;
}
// This is a fail for layer hoisting
this->INHERITED::operator()(sl);
}
private:
SkCanvas* fCanvas;
const SkPicture* fPicture;
const GrReplacements* fReplacements;
const SkMatrix fInitialMatrix;
SkDrawPictureCallback* fCallback;
SkTDArray<unsigned> fOps;
int fIndex;
typedef Draw INHERITED;
};
void GrRecordReplaceDraw(const SkPicture* picture,
SkCanvas* canvas,
const GrReplacements* replacements,
const SkMatrix& initialMatrix,
SkDrawPictureCallback* callback) {
SkAutoCanvasRestore saveRestore(canvas, true /*save now, restore at exit*/);
ReplaceDraw draw(canvas, picture, replacements, initialMatrix, callback);
draw.draw();
}
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