bool SkDisplacementMapEffect::onFilterImage(Proxy* proxy,
const SkBitmap& src,
const SkMatrix& ctm,
SkBitmap* dst,
SkIPoint* offset) {
SkBitmap displ, color = src;
SkImageFilter* colorInput = getColorInput();
SkImageFilter* displacementInput = getDisplacementInput();
SkASSERT(NULL != displacementInput);
if ((colorInput && !colorInput->filterImage(proxy, src, ctm, &color, offset)) ||
!displacementInput->filterImage(proxy, src, ctm, &displ, offset)) {
return false;
}
if ((displ.config() != SkBitmap::kARGB_8888_Config) ||
(color.config() != SkBitmap::kARGB_8888_Config)) {
return false;
}
SkAutoLockPixels alp_displacement(displ), alp_color(color);
if (!displ.getPixels() || !color.getPixels()) {
return false;
}
dst->setConfig(displ.config(), displ.width(), displ.height());
dst->allocPixels();
if (!dst->getPixels()) {
return false;
}
computeDisplacement(fXChannelSelector, fYChannelSelector, fScale, dst, &displ, &color);
return true;
}
bool SkDisplacementMapEffect::onFilterImage(Proxy* proxy,
const SkBitmap& src,
const Context& ctx,
SkBitmap* dst,
SkIPoint* offset) const {
SkBitmap displ = src, color = src;
SkIPoint colorOffset = SkIPoint::Make(0, 0), displOffset = SkIPoint::Make(0, 0);
if (!this->filterInput(1, proxy, src, ctx, &color, &colorOffset) ||
!this->filterInput(0, proxy, src, ctx, &displ, &displOffset)) {
return false;
}
if ((displ.colorType() != kN32_SkColorType) ||
(color.colorType() != kN32_SkColorType)) {
return false;
}
SkIRect bounds;
// Since computeDisplacement does bounds checking on color pixel access, we don't need to pad
// the color bitmap to bounds here.
SkIRect srcBounds = color.bounds();
srcBounds.offset(colorOffset);
if (!this->applyCropRect(ctx, srcBounds, &bounds)) {
return false;
}
SkIRect displBounds;
if (!this->applyCropRect(ctx, proxy, displ, &displOffset, &displBounds, &displ)) {
return false;
}
if (!bounds.intersect(displBounds)) {
return false;
}
SkAutoLockPixels alp_displacement(displ), alp_color(color);
if (!displ.getPixels() || !color.getPixels()) {
return false;
}
SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(bounds.width(), bounds.height()));
if (!device) {
return false;
}
*dst = device->accessBitmap(false);
SkAutoLockPixels alp_dst(*dst);
SkVector scale = SkVector::Make(fScale, fScale);
ctx.ctm().mapVectors(&scale, 1);
SkIRect colorBounds = bounds;
colorBounds.offset(-colorOffset);
computeDisplacement(fXChannelSelector, fYChannelSelector, scale, dst,
&displ, colorOffset - displOffset, &color, colorBounds);
offset->fX = bounds.left();
offset->fY = bounds.top();
return true;
}