void SkDevice::writePixels(const SkBitmap& bitmap,
int x, int y,
SkCanvas::Config8888 config8888) {
if (bitmap.isNull() || bitmap.getTexture()) {
return;
}
const SkBitmap* sprite = &bitmap;
// check whether we have to handle a config8888 that doesn't match SkPMColor
if (SkBitmap::kARGB_8888_Config == bitmap.config() &&
SkCanvas::kNative_Premul_Config8888 != config8888 &&
kPMColorAlias != config8888) {
// We're going to have to convert from a config8888 to the native config
// First we clip to the device bounds.
SkBitmap dstBmp = this->accessBitmap(true);
SkIRect spriteRect = SkIRect::MakeXYWH(x, y,
bitmap.width(), bitmap.height());
SkIRect devRect = SkIRect::MakeWH(dstBmp.width(), dstBmp.height());
if (!spriteRect.intersect(devRect)) {
return;
}
// write directly to the device if it has pixels and is SkPMColor
bool drawSprite;
if (SkBitmap::kARGB_8888_Config == dstBmp.config() && !dstBmp.isNull()) {
// we can write directly to the dst when doing the conversion
dstBmp.extractSubset(&dstBmp, spriteRect);
drawSprite = false;
} else {
// we convert to a temporary bitmap and draw that as a sprite
dstBmp.setConfig(SkBitmap::kARGB_8888_Config,
spriteRect.width(),
spriteRect.height());
if (!dstBmp.allocPixels()) {
return;
}
drawSprite = true;
}
// copy pixels to dstBmp and convert from config8888 to native config.
SkAutoLockPixels alp(bitmap);
uint32_t* srcPixels = bitmap.getAddr32(spriteRect.fLeft - x,
spriteRect.fTop - y);
SkCopyConfig8888ToBitmap(dstBmp,
srcPixels,
bitmap.rowBytes(),
config8888);
if (drawSprite) {
// we've clipped the sprite when we made a copy
x = spriteRect.fLeft;
y = spriteRect.fTop;
sprite = &dstBmp;
} else {
return;
}
}
SkPaint paint;
paint.setXfermodeMode(SkXfermode::kSrc_Mode);
SkRasterClip clip(SkIRect::MakeWH(fBitmap.width(), fBitmap.height()));
SkDraw draw;
draw.fRC = &clip;
draw.fClip = &clip.bwRgn();
draw.fBitmap = &fBitmap; // canvas should have already called accessBitmap
draw.fMatrix = &SkMatrix::I();
this->drawSprite(draw, *sprite, x, y, paint);
}
bool SkDisplacementMapEffect::filterImageGPU(Proxy* proxy, const SkBitmap& src, const Context& ctx,
SkBitmap* result, SkIPoint* offset) const {
SkBitmap colorBM = src;
SkIPoint colorOffset = SkIPoint::Make(0, 0);
if (!this->filterInputGPU(1, proxy, src, ctx, &colorBM, &colorOffset)) {
return false;
}
SkBitmap displacementBM = src;
SkIPoint displacementOffset = SkIPoint::Make(0, 0);
if (!this->filterInputGPU(0, proxy, src, ctx, &displacementBM, &displacementOffset)) {
return false;
}
SkIRect bounds;
// Since GrDisplacementMapEffect does bounds checking on color pixel access, we don't need to
// pad the color bitmap to bounds here.
if (!this->applyCropRect(ctx, colorBM, colorOffset, &bounds)) {
return false;
}
SkIRect displBounds;
if (!this->applyCropRect(ctx, proxy, displacementBM,
&displacementOffset, &displBounds, &displacementBM)) {
return false;
}
if (!bounds.intersect(displBounds)) {
return false;
}
GrTexture* color = colorBM.getTexture();
GrTexture* displacement = displacementBM.getTexture();
GrContext* context = color->getContext();
GrSurfaceDesc desc;
desc.fFlags = kRenderTarget_GrSurfaceFlag;
desc.fWidth = bounds.width();
desc.fHeight = bounds.height();
desc.fConfig = kSkia8888_GrPixelConfig;
SkAutoTUnref<GrTexture> dst(context->textureProvider()->createApproxTexture(desc));
if (!dst) {
return false;
}
SkVector scale = SkVector::Make(fScale, fScale);
ctx.ctm().mapVectors(&scale, 1);
GrPaint paint;
SkMatrix offsetMatrix = GrCoordTransform::MakeDivByTextureWHMatrix(displacement);
offsetMatrix.preTranslate(SkIntToScalar(colorOffset.fX - displacementOffset.fX),
SkIntToScalar(colorOffset.fY - displacementOffset.fY));
paint.addColorFragmentProcessor(
GrDisplacementMapEffect::Create(fXChannelSelector,
fYChannelSelector,
scale,
displacement,
offsetMatrix,
color,
colorBM.dimensions()))->unref();
paint.setPorterDuffXPFactory(SkXfermode::kSrc_Mode);
SkIRect colorBounds = bounds;
colorBounds.offset(-colorOffset);
SkMatrix matrix;
matrix.setTranslate(-SkIntToScalar(colorBounds.x()),
-SkIntToScalar(colorBounds.y()));
SkAutoTUnref<GrDrawContext> drawContext(context->drawContext(dst->asRenderTarget()));
if (!drawContext) {
return false;
}
drawContext->drawRect(GrClip::WideOpen(), paint, matrix, SkRect::Make(colorBounds));
offset->fX = bounds.left();
offset->fY = bounds.top();
GrWrapTextureInBitmap(dst, bounds.width(), bounds.height(), false, result);
return true;
}
