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/**
* Copyright (C) 2023 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 "Gainmap.h"
#include <SkBitmap.h>
#include <SkCanvas.h>
#include <SkColorFilter.h>
#include <SkImagePriv.h>
#include <SkPaint.h>
#include "HardwareBitmapUploader.h"
namespace android::uirenderer {
sp<Gainmap> Gainmap::allocateHardwareGainmap(const sp<Gainmap>& srcGainmap) {
auto gainmap = sp<Gainmap>::make();
gainmap->info = srcGainmap->info;
SkBitmap skSrcBitmap = srcGainmap->bitmap->getSkBitmap();
if (skSrcBitmap.info().colorType() == kAlpha_8_SkColorType &&
!HardwareBitmapUploader::hasAlpha8Support()) {
// The regular Bitmap::allocateHardwareBitmap will do a conversion that preserves channels,
// so alpha8 maps to the alpha channel of rgba. However, for gainmaps we will interpret
// the data of an rgba buffer differently as we'll only look at the rgb channels
// So we need to map alpha8 to rgbx_8888 essentially
SkBitmap bitmap;
bitmap.allocPixels(skSrcBitmap.info().makeColorType(kN32_SkColorType));
SkCanvas canvas(bitmap);
SkPaint paint;
const float alphaToOpaque[] = {0, 0, 0, 1, 0, 0, 0, 0, 1, 0,
0, 0, 0, 1, 0, 0, 0, 0, 0, 255};
paint.setColorFilter(SkColorFilters::Matrix(alphaToOpaque, SkColorFilters::Clamp::kNo));
canvas.drawImage(SkMakeImageFromRasterBitmap(skSrcBitmap, kNever_SkCopyPixelsMode), 0, 0,
SkSamplingOptions{}, &paint);
skSrcBitmap = bitmap;
}
sk_sp<Bitmap> skBitmap(Bitmap::allocateHardwareBitmap(skSrcBitmap));
if (!skBitmap.get()) {
return nullptr;
}
gainmap->bitmap = std::move(skBitmap);
return gainmap;
}
} // namespace android::uirenderer
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