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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 "SkPictureShader.h"
#include "SkBitmap.h"
#include "SkBitmapProcShader.h"
#include "SkCanvas.h"
#include "SkMatrixUtils.h"
#include "SkPicture.h"
#include "SkReadBuffer.h"
#if SK_SUPPORT_GPU
#include "GrContext.h"
#endif
SkPictureShader::SkPictureShader(SkPicture* picture, TileMode tmx, TileMode tmy,
const SkMatrix* localMatrix)
: INHERITED(localMatrix)
, fPicture(SkRef(picture))
, fTmx(tmx)
, fTmy(tmy) { }
SkPictureShader::SkPictureShader(SkReadBuffer& buffer)
: INHERITED(buffer) {
fTmx = static_cast<SkShader::TileMode>(buffer.read32());
fTmy = static_cast<SkShader::TileMode>(buffer.read32());
fPicture = SkPicture::CreateFromBuffer(buffer);
}
SkPictureShader::~SkPictureShader() {
fPicture->unref();
}
SkPictureShader* SkPictureShader::Create(SkPicture* picture, TileMode tmx, TileMode tmy,
const SkMatrix* localMatrix) {
if (!picture || 0 == picture->width() || 0 == picture->height()) {
return NULL;
}
return SkNEW_ARGS(SkPictureShader, (picture, tmx, tmy, localMatrix));
}
void SkPictureShader::flatten(SkWriteBuffer& buffer) const {
this->INHERITED::flatten(buffer);
buffer.write32(fTmx);
buffer.write32(fTmy);
fPicture->flatten(buffer);
}
SkShader* SkPictureShader::refBitmapShader(const SkMatrix& matrix, const SkMatrix* localM) const {
SkASSERT(fPicture && fPicture->width() > 0 && fPicture->height() > 0);
SkMatrix m;
if (this->hasLocalMatrix()) {
m.setConcat(matrix, this->getLocalMatrix());
} else {
m = matrix;
}
if (localM) {
m.preConcat(*localM);
}
// Use a rotation-invariant scale
SkPoint scale;
if (!SkDecomposeUpper2x2(m, NULL, &scale, NULL)) {
// Decomposition failed, use an approximation.
scale.set(SkScalarSqrt(m.getScaleX() * m.getScaleX() + m.getSkewX() * m.getSkewX()),
SkScalarSqrt(m.getScaleY() * m.getScaleY() + m.getSkewY() * m.getSkewY()));
}
SkSize scaledSize = SkSize::Make(scale.x() * fPicture->width(), scale.y() * fPicture->height());
SkISize tileSize = scaledSize.toRound();
if (tileSize.isEmpty()) {
return NULL;
}
// The actual scale, compensating for rounding.
SkSize tileScale = SkSize::Make(SkIntToScalar(tileSize.width()) / fPicture->width(),
SkIntToScalar(tileSize.height()) / fPicture->height());
SkAutoMutexAcquire ama(fCachedBitmapShaderMutex);
// TODO(fmalita): remove fCachedLocalMatrix from this key after getLocalMatrix is removed.
if (!fCachedBitmapShader || tileScale != fCachedTileScale ||
this->getLocalMatrix() != fCachedLocalMatrix) {
SkBitmap bm;
if (!bm.allocN32Pixels(tileSize.width(), tileSize.height())) {
return NULL;
}
bm.eraseColor(SK_ColorTRANSPARENT);
SkCanvas canvas(bm);
canvas.scale(tileScale.width(), tileScale.height());
canvas.drawPicture(*fPicture);
fCachedTileScale = tileScale;
fCachedLocalMatrix = this->getLocalMatrix();
SkMatrix shaderMatrix = this->getLocalMatrix();
shaderMatrix.preScale(1 / tileScale.width(), 1 / tileScale.height());
fCachedBitmapShader.reset(CreateBitmapShader(bm, fTmx, fTmy, &shaderMatrix));
}
// Increment the ref counter inside the mutex to ensure the returned pointer is still valid.
// Otherwise, the pointer may have been overwritten on a different thread before the object's
// ref count was incremented.
fCachedBitmapShader.get()->ref();
return fCachedBitmapShader;
}
size_t SkPictureShader::contextSize() const {
return sizeof(PictureShaderContext);
}
SkShader::Context* SkPictureShader::onCreateContext(const ContextRec& rec, void* storage) const {
SkAutoTUnref<SkShader> bitmapShader(this->refBitmapShader(*rec.fMatrix, rec.fLocalMatrix));
if (NULL == bitmapShader.get()) {
return NULL;
}
return PictureShaderContext::Create(storage, *this, rec, bitmapShader);
}
/////////////////////////////////////////////////////////////////////////////////////////
SkShader::Context* SkPictureShader::PictureShaderContext::Create(void* storage,
const SkPictureShader& shader, const ContextRec& rec, SkShader* bitmapShader) {
PictureShaderContext* ctx = SkNEW_PLACEMENT_ARGS(storage, PictureShaderContext,
(shader, rec, bitmapShader));
if (NULL == ctx->fBitmapShaderContext) {
ctx->~PictureShaderContext();
ctx = NULL;
}
return ctx;
}
SkPictureShader::PictureShaderContext::PictureShaderContext(
const SkPictureShader& shader, const ContextRec& rec, SkShader* bitmapShader)
: INHERITED(shader, rec)
, fBitmapShader(SkRef(bitmapShader))
{
fBitmapShaderContextStorage = sk_malloc_throw(bitmapShader->contextSize());
fBitmapShaderContext = bitmapShader->createContext(rec, fBitmapShaderContextStorage);
//if fBitmapShaderContext is null, we are invalid
}
SkPictureShader::PictureShaderContext::~PictureShaderContext() {
if (fBitmapShaderContext) {
fBitmapShaderContext->~Context();
}
sk_free(fBitmapShaderContextStorage);
}
uint32_t SkPictureShader::PictureShaderContext::getFlags() const {
SkASSERT(fBitmapShaderContext);
return fBitmapShaderContext->getFlags();
}
SkShader::Context::ShadeProc SkPictureShader::PictureShaderContext::asAShadeProc(void** ctx) {
SkASSERT(fBitmapShaderContext);
return fBitmapShaderContext->asAShadeProc(ctx);
}
void SkPictureShader::PictureShaderContext::shadeSpan(int x, int y, SkPMColor dstC[], int count) {
SkASSERT(fBitmapShaderContext);
fBitmapShaderContext->shadeSpan(x, y, dstC, count);
}
void SkPictureShader::PictureShaderContext::shadeSpan16(int x, int y, uint16_t dstC[], int count) {
SkASSERT(fBitmapShaderContext);
fBitmapShaderContext->shadeSpan16(x, y, dstC, count);
}
#ifndef SK_IGNORE_TO_STRING
void SkPictureShader::toString(SkString* str) const {
static const char* gTileModeName[SkShader::kTileModeCount] = {
"clamp", "repeat", "mirror"
};
str->appendf("PictureShader: [%d:%d] ",
fPicture ? fPicture->width() : 0,
fPicture ? fPicture->height() : 0);
str->appendf("(%s, %s)", gTileModeName[fTmx], gTileModeName[fTmy]);
this->INHERITED::toString(str);
}
#endif
#if SK_SUPPORT_GPU
GrEffectRef* SkPictureShader::asNewEffect(GrContext* context, const SkPaint& paint) const {
SkAutoTUnref<SkShader> bitmapShader(this->refBitmapShader(context->getMatrix(), NULL));
if (!bitmapShader) {
return NULL;
}
return bitmapShader->asNewEffect(context, paint);
}
#endif
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