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/*
* Copyright (C) 2021 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "StretchMask.h"
#include "SkSurface.h"
#include "SkCanvas.h"
#include "TransformCanvas.h"
#include "SkiaDisplayList.h"
using android::uirenderer::StretchMask;
void StretchMask::draw(GrRecordingContext* context,
const StretchEffect& stretch,
const SkRect& bounds,
skiapipeline::SkiaDisplayList* displayList,
SkCanvas* canvas) {
float width = bounds.width();
float height = bounds.height();
if (mMaskSurface == nullptr || mMaskSurface->width() != width ||
mMaskSurface->height() != height) {
// Create a new surface if we don't have one or our existing size does
// not match.
mMaskSurface = SkSurface::MakeRenderTarget(
context,
SkBudgeted::kYes,
SkImageInfo::Make(
width,
height,
SkColorType::kAlpha_8_SkColorType,
SkAlphaType::kPremul_SkAlphaType)
);
mIsDirty = true;
}
if (mIsDirty) {
SkCanvas* maskCanvas = mMaskSurface->getCanvas();
// Make sure to apply target transformation to the mask canvas
// to ensure the replayed drawing commands generate the same result
auto previousMatrix = displayList->mParentMatrix;
displayList->mParentMatrix = maskCanvas->getTotalMatrix();
maskCanvas->save();
maskCanvas->drawColor(0, SkBlendMode::kClear);
TransformCanvas transformCanvas(maskCanvas, SkBlendMode::kSrcOver);
displayList->draw(&transformCanvas);
maskCanvas->restore();
displayList->mParentMatrix = previousMatrix;
}
sk_sp<SkImage> maskImage = mMaskSurface->makeImageSnapshot();
sk_sp<SkShader> maskStretchShader = stretch.getShader(width, height, maskImage, nullptr);
SkPaint maskPaint;
maskPaint.setShader(maskStretchShader);
maskPaint.setBlendMode(SkBlendMode::kDstOut);
canvas->drawRect(bounds, maskPaint);
mIsDirty = false;
}
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