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/*
* Copyright 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.
*/
#define ATRACE_TAG ATRACE_TAG_GRAPHICS
#include "GaussianBlurFilter.h"
#include <SkCanvas.h>
#include <SkData.h>
#include <SkPaint.h>
#include <SkRRect.h>
#include <SkRuntimeEffect.h>
#include <SkImageFilters.h>
#include <SkSize.h>
#include <SkString.h>
#include <SkSurface.h>
#include <log/log.h>
#include <utils/Trace.h>
namespace android {
namespace renderengine {
namespace skia {
// This constant approximates the scaling done in the software path's
// "high quality" mode, in SkBlurMask::Blur() (1 / sqrt(3)).
static const float BLUR_SIGMA_SCALE = 0.57735f;
GaussianBlurFilter::GaussianBlurFilter(): BlurFilter(/* maxCrossFadeRadius= */ 0.0f) {}
sk_sp<SkImage> GaussianBlurFilter::generate(GrRecordingContext* context, const uint32_t blurRadius,
const sk_sp<SkImage> input, const SkRect& blurRect)
const {
// Create blur surface with the bit depth and colorspace of the original surface
SkImageInfo scaledInfo = input->imageInfo().makeWH(std::ceil(blurRect.width() * kInputScale),
std::ceil(blurRect.height() * kInputScale));
sk_sp<SkSurface> surface = SkSurface::MakeRenderTarget(context, SkBudgeted::kNo, scaledInfo);
SkPaint paint;
paint.setBlendMode(SkBlendMode::kSrc);
paint.setImageFilter(SkImageFilters::Blur(
blurRadius * kInputScale * BLUR_SIGMA_SCALE,
blurRadius * kInputScale * BLUR_SIGMA_SCALE,
SkTileMode::kClamp, nullptr));
surface->getCanvas()->drawImageRect(
input,
blurRect,
SkRect::MakeWH(scaledInfo.width(), scaledInfo.height()),
SkSamplingOptions{SkFilterMode::kLinear, SkMipmapMode::kNone},
&paint,
SkCanvas::SrcRectConstraint::kFast_SrcRectConstraint);
return surface->makeImageSnapshot();
}
} // namespace skia
} // namespace renderengine
} // namespace android
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