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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.
*/
// #define LOG_NDEBUG 0
#include <algorithm>
#include "HdrSdrRatioOverlay.h"
#include <SkSurface.h>
#undef LOG_TAG
#define LOG_TAG "HdrSdrRatioOverlay"
namespace android {
void HdrSdrRatioOverlay::drawNumber(float number, int left, SkColor color, SkCanvas& canvas) {
if (!isfinite(number) || number >= 10.f) return;
// We assume that the number range is [1.f, 10.f)
// and the decimal places are 2.
int value = static_cast<int>(number * 100);
SegmentDrawer::drawDigit(value / 100, left, color, canvas);
left += kDigitWidth + kDigitSpace;
SegmentDrawer::drawSegment(SegmentDrawer::Segment::DecimalPoint, left, color, canvas);
left += kDigitWidth + kDigitSpace;
SegmentDrawer::drawDigit((value / 10) % 10, left, color, canvas);
left += kDigitWidth + kDigitSpace;
SegmentDrawer::drawDigit(value % 10, left, color, canvas);
}
sp<GraphicBuffer> HdrSdrRatioOverlay::draw(float currentHdrSdrRatio, SkColor color,
ui::Transform::RotationFlags rotation,
sp<GraphicBuffer>& ringBuffer) {
const int32_t bufferWidth = kBufferWidth;
const int32_t bufferHeight = kBufferWidth;
const auto kUsageFlags = static_cast<uint64_t>(
GRALLOC_USAGE_SW_WRITE_RARELY | GRALLOC_USAGE_HW_COMPOSER | GRALLOC_USAGE_HW_TEXTURE);
// ring buffers here to do double-buffered rendering to avoid
// possible tearing and also to reduce memory take-up.
if (ringBuffer == nullptr) {
ringBuffer = sp<GraphicBuffer>::make(static_cast<uint32_t>(bufferWidth),
static_cast<uint32_t>(bufferHeight),
HAL_PIXEL_FORMAT_RGBA_8888, 1u, kUsageFlags,
"HdrSdrRatioOverlayBuffer");
}
auto& buffer = ringBuffer;
SkMatrix canvasTransform = SkMatrix();
switch (rotation) {
case ui::Transform::ROT_90:
canvasTransform.setTranslate(bufferHeight, 0);
canvasTransform.preRotate(90.f);
break;
case ui::Transform::ROT_270:
canvasTransform.setRotate(270.f, bufferWidth / 2.f, bufferWidth / 2.f);
break;
default:
break;
}
const status_t bufferStatus = buffer->initCheck();
LOG_ALWAYS_FATAL_IF(bufferStatus != OK, "HdrSdrRatioOverlay: Buffer failed to allocate: %d",
bufferStatus);
sk_sp<SkSurface> surface =
SkSurfaces::Raster(SkImageInfo::MakeN32Premul(bufferWidth, bufferHeight));
SkCanvas* canvas = surface->getCanvas();
canvas->setMatrix(canvasTransform);
drawNumber(currentHdrSdrRatio, 0, color, *canvas);
void* pixels = nullptr;
buffer->lock(GRALLOC_USAGE_SW_WRITE_RARELY, reinterpret_cast<void**>(&pixels));
const SkImageInfo& imageInfo = surface->imageInfo();
const size_t dstRowBytes = buffer->getStride() * static_cast<size_t>(imageInfo.bytesPerPixel());
canvas->readPixels(imageInfo, pixels, dstRowBytes, 0, 0);
buffer->unlock();
return buffer;
}
std::unique_ptr<HdrSdrRatioOverlay> HdrSdrRatioOverlay::create() {
std::unique_ptr<HdrSdrRatioOverlay> overlay =
std::make_unique<HdrSdrRatioOverlay>(ConstructorTag{});
if (overlay->initCheck()) {
return overlay;
}
ALOGE("%s: Failed to create HdrSdrRatioOverlay", __func__);
return {};
}
HdrSdrRatioOverlay::HdrSdrRatioOverlay(ConstructorTag)
: mSurfaceControl(
SurfaceControlHolder::createSurfaceControlHolder(String8("HdrSdrRatioOverlay"))) {
if (!mSurfaceControl) {
ALOGE("%s: Failed to create buffer state layer", __func__);
return;
}
SurfaceComposerClient::Transaction()
.setLayer(mSurfaceControl->get(), INT32_MAX - 2)
.setTrustedOverlay(mSurfaceControl->get(), true)
.apply();
}
bool HdrSdrRatioOverlay::initCheck() const {
return mSurfaceControl != nullptr;
}
void HdrSdrRatioOverlay::changeHdrSdrRatio(float currentHdrSdrRatio) {
mCurrentHdrSdrRatio = currentHdrSdrRatio;
animate();
}
void HdrSdrRatioOverlay::setLayerStack(ui::LayerStack stack) {
SurfaceComposerClient::Transaction().setLayerStack(mSurfaceControl->get(), stack).apply();
}
void HdrSdrRatioOverlay::setViewport(ui::Size viewport) {
constexpr int32_t kMaxWidth = 1000;
const auto width = std::min({kMaxWidth, viewport.width, viewport.height});
const auto height = 2 * width;
Rect frame((5 * width) >> 4, height >> 5);
// set the ratio frame to the top right of the screen
frame.offsetBy(viewport.width - frame.width(), height >> 4);
SurfaceComposerClient::Transaction()
.setMatrix(mSurfaceControl->get(), frame.getWidth() / static_cast<float>(kBufferWidth),
0, 0, frame.getHeight() / static_cast<float>(kBufferHeight))
.setPosition(mSurfaceControl->get(), frame.left, frame.top)
.apply();
}
auto HdrSdrRatioOverlay::getOrCreateBuffers(float currentHdrSdrRatio) -> const sp<GraphicBuffer> {
static const sp<GraphicBuffer> kNoBuffer;
if (!mSurfaceControl) return kNoBuffer;
const auto transformHint =
static_cast<ui::Transform::RotationFlags>(mSurfaceControl->get()->getTransformHint());
// Tell SurfaceFlinger about the pre-rotation on the buffer.
const auto transform = [&] {
switch (transformHint) {
case ui::Transform::ROT_90:
return ui::Transform::ROT_270;
case ui::Transform::ROT_270:
return ui::Transform::ROT_90;
default:
return ui::Transform::ROT_0;
}
}();
SurfaceComposerClient::Transaction().setTransform(mSurfaceControl->get(), transform).apply();
constexpr SkColor kMinRatioColor = SK_ColorBLUE;
constexpr SkColor kMaxRatioColor = SK_ColorGREEN;
constexpr float kAlpha = 0.8f;
// 9.f is picked here as ratio range, given that we assume that
// hdr/sdr ratio is [1.f, 10.f)
const float scale = currentHdrSdrRatio / 9.f;
SkColor4f colorBase = SkColor4f::FromColor(kMaxRatioColor) * scale;
const SkColor4f minRatioColor = SkColor4f::FromColor(kMinRatioColor) * (1 - scale);
colorBase.fR = colorBase.fR + minRatioColor.fR;
colorBase.fG = colorBase.fG + minRatioColor.fG;
colorBase.fB = colorBase.fB + minRatioColor.fB;
colorBase.fA = kAlpha;
const SkColor color = colorBase.toSkColor();
auto buffer = draw(currentHdrSdrRatio, color, transformHint, mRingBuffer[mIndex]);
mIndex = (mIndex + 1) % 2;
return buffer;
}
void HdrSdrRatioOverlay::animate() {
if (!std::isfinite(mCurrentHdrSdrRatio) || mCurrentHdrSdrRatio < 1.0f) return;
SurfaceComposerClient::Transaction()
.setBuffer(mSurfaceControl->get(), getOrCreateBuffers(mCurrentHdrSdrRatio))
.apply();
}
} // namespace android
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