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Image generator-backed SkPictureShader

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A respin of http://crrev.com/866773002

R=reed@google.com

Review URL: https://codereview.chromium.org/1323863002
This commit is contained in:
fmalita 2015-08-31 19:54:03 -07:00 committed by Commit bot
parent dde03ff89f
commit ddc4b46c34
2 changed files with 17 additions and 40 deletions
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50
src/core/SkPictureShader.cpp
View File

@ -10,6 +10,7 @@
#include "SkBitmap.h"
#include "SkBitmapProcShader.h"
#include "SkCanvas.h"
#include "SkImageGenerator.h"
#include "SkMatrixUtils.h"
#include "SkPicture.h"
#include "SkReadBuffer.h"
@ -84,26 +85,12 @@ struct BitmapShaderRec : public SkResourceCache::Rec {
result->reset(SkRef(rec.fShader.get()));
SkBitmap tile;
if (rec.fShader.get()->isABitmap(&tile, nullptr, nullptr)) {
// FIXME: this doesn't protect the pixels from being discarded as soon as we unlock.
// Should be handled via a pixel ref generator instead
// (https://code.google.com/p/skia/issues/detail?id=3220).
SkAutoLockPixels alp(tile, true);
return tile.getPixels() != nullptr;
}
return false;
// The bitmap shader is backed by an image generator, thus it can always re-generate its
// pixels if discarded.
return true;
}
};
static bool cache_try_alloc_pixels(SkBitmap* bitmap) {
SkBitmap::Allocator* allocator = SkResourceCache::GetAllocator();
return nullptr != allocator
? allocator->allocPixelRef(bitmap, nullptr)
: bitmap->tryAllocPixels();
}
} // namespace
SkPictureShader::SkPictureShader(const SkPicture* picture, TileMode tmx, TileMode tmy,
@ -115,10 +102,6 @@ SkPictureShader::SkPictureShader(const SkPicture* picture, TileMode tmx, TileMod
, fTmy(tmy) {
}
SkPictureShader::~SkPictureShader() {
fPicture->unref();
}
SkShader* SkPictureShader::Create(const SkPicture* picture, TileMode tmx, TileMode tmy,
const SkMatrix* localMatrix, const SkRect* tile) {
if (!picture || picture->cullRect().isEmpty() || (tile && tile->isEmpty())) {
@ -232,19 +215,14 @@ SkShader* SkPictureShader::refBitmapShader(const SkMatrix& matrix, const SkMatri
this->getLocalMatrix());
if (!SkResourceCache::Find(key, BitmapShaderRec::Visitor, &tileShader)) {
SkMatrix matrix;
matrix.setRectToRect(fTile, SkRect::MakeIWH(tileSize.width(), tileSize.height()),
SkMatrix::kFill_ScaleToFit);
SkBitmap bm;
bm.setInfo(SkImageInfo::MakeN32Premul(tileSize));
if (!cache_try_alloc_pixels(&bm)) {
return SkShader::CreateEmptyShader();
if (!SkInstallDiscardablePixelRef(
SkImageGenerator::NewFromPicture(tileSize, fPicture, &matrix, nullptr), &bm)) {
return nullptr;
}
bm.eraseColor(SK_ColorTRANSPARENT);
// Always disable LCD text, since we can't assume our image will be opaque.
SkCanvas canvas(bm, SkSurfaceProps(0, kUnknown_SkPixelGeometry));
canvas.scale(tileScale.width(), tileScale.height());
canvas.translate(-fTile.x(), -fTile.y());
canvas.drawPicture(fPicture);
SkMatrix shaderMatrix = this->getLocalMatrix();
shaderMatrix.preScale(1 / tileScale.width(), 1 / tileScale.height());
@ -324,10 +302,10 @@ void SkPictureShader::toString(SkString* str) const {
};
str->appendf("PictureShader: [%f:%f:%f:%f] ",
fPicture ? fPicture->cullRect().fLeft : 0,
fPicture ? fPicture->cullRect().fTop : 0,
fPicture ? fPicture->cullRect().fRight : 0,
fPicture ? fPicture->cullRect().fBottom : 0);
fPicture->cullRect().fLeft,
fPicture->cullRect().fTop,
fPicture->cullRect().fRight,
fPicture->cullRect().fBottom);
str->appendf("(%s, %s)", gTileModeName[fTmx], gTileModeName[fTmy]);

7
src/core/SkPictureShader.h
View File

@ -24,7 +24,6 @@ class SkPictureShader : public SkShader {
public:
static SkShader* Create(const SkPicture*, TileMode, TileMode, const SkMatrix*,
const SkRect*);
virtual ~SkPictureShader();
size_t contextSize() const override;
@ -49,9 +48,9 @@ private:
SkShader* refBitmapShader(const SkMatrix&, const SkMatrix* localMatrix, const int maxTextureSize = 0) const;
const SkPicture* fPicture;
SkRect fTile;
TileMode fTmx, fTmy;
SkAutoTUnref<const SkPicture> fPicture;
SkRect fTile;
TileMode fTmx, fTmy;
class PictureShaderContext : public SkShader::Context {
public: