SkShader::Context* SkBitmapProcShader::onCreateContext(const ContextRec& rec, void* storage) const {
if (!fRawBitmap.getTexture() && !valid_for_drawing(fRawBitmap)) {
return NULL;
}
SkMatrix totalInverse;
// Do this first, so we know the matrix can be inverted.
if (!this->computeTotalInverse(rec, &totalInverse)) {
return NULL;
}
void* stateStorage = (char*)storage + sizeof(BitmapProcShaderContext);
SkBitmapProcState* state = SkNEW_PLACEMENT(stateStorage, SkBitmapProcState);
SkASSERT(state);
state->fTileModeX = fTileModeX;
state->fTileModeY = fTileModeY;
state->fOrigBitmap = fRawBitmap;
if (!state->chooseProcs(totalInverse, *rec.fPaint)) {
state->~SkBitmapProcState();
return NULL;
}
return SkNEW_PLACEMENT_ARGS(storage, BitmapProcShaderContext, (*this, rec, state));
}
SkBitmapController::State* SkBitmapController::requestBitmap(const SkBitmap& bm,
const SkMatrix& inv,
SkFilterQuality quality,
void* storage, size_t storageSize) {
if (!valid_for_drawing(bm)) {
return NULL;
}
State* state = this->onRequestBitmap(bm, inv, quality, storage, storageSize);
if (state) {
if (NULL == state->fPixmap.addr()) {
SkInPlaceDeleteCheck(state, storage);
state = NULL;
}
}
return state;
}
bool SkBitmapProcShader::setContext(const SkBitmap& device,
const SkPaint& paint,
const SkMatrix& matrix) {
if (!fRawBitmap.getTexture() && !valid_for_drawing(fRawBitmap)) {
return false;
}
// do this first, so we have a correct inverse matrix
if (!this->INHERITED::setContext(device, paint, matrix)) {
return false;
}
fState.fOrigBitmap = fRawBitmap;
if (!fState.chooseProcs(this->getTotalInverse(), paint)) {
this->INHERITED::endContext();
return false;
}
const SkBitmap& bitmap = *fState.fBitmap;
bool bitmapIsOpaque = bitmap.isOpaque();
// update fFlags
uint32_t flags = 0;
if (bitmapIsOpaque && (255 == this->getPaintAlpha())) {
flags |= kOpaqueAlpha_Flag;
}
switch (bitmap.config()) {
case SkBitmap::kRGB_565_Config:
flags |= (kHasSpan16_Flag | kIntrinsicly16_Flag);
break;
case SkBitmap::kIndex8_Config:
case SkBitmap::kARGB_8888_Config:
if (bitmapIsOpaque) {
flags |= kHasSpan16_Flag;
}
break;
case SkBitmap::kA8_Config:
break; // never set kHasSpan16_Flag
default:
break;
}
if (paint.isDither() && bitmap.config() != SkBitmap::kRGB_565_Config) {
// gradients can auto-dither in their 16bit sampler, but we don't so
// we clear the flag here.
flags &= ~kHasSpan16_Flag;
}
// if we're only 1-pixel high, and we don't rotate, then we can claim this
if (1 == bitmap.height() &&
only_scale_and_translate(this->getTotalInverse())) {
flags |= kConstInY32_Flag;
if (flags & kHasSpan16_Flag) {
flags |= kConstInY16_Flag;
}
}
fFlags = flags;
return true;
}
