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/*
* Copyright (C) 2012 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 "Layer.h"
#include "renderstate/RenderState.h"
#include "utils/Color.h"
#include "utils/MathUtils.h"
namespace android {
namespace uirenderer {
Layer::Layer(RenderState& renderState, sk_sp<SkColorFilter> colorFilter, int alpha,
SkBlendMode mode)
: mRenderState(renderState)
, mColorFilter(colorFilter)
, alpha(alpha)
, mode(mode) {
// TODO: This is a violation of Android's typical ref counting, but it
// preserves the old inc/dec ref locations. This should be changed...
incStrong(nullptr);
renderState.registerLayer(this);
texTransform.setIdentity();
transform.setIdentity();
}
Layer::~Layer() {
mRenderState.unregisterLayer(this);
}
void Layer::postDecStrong() {
mRenderState.postDecStrong(this);
}
SkBlendMode Layer::getMode() const {
if (mBlend || mode != SkBlendMode::kSrcOver) {
return mode;
} else {
return SkBlendMode::kSrc;
}
}
static inline SkScalar isIntegerAligned(SkScalar x) {
return MathUtils::isZero(roundf(x) - x);
}
// Disable filtering when there is no scaling in screen coordinates and the corners have the same
// fraction (for translate) or zero fraction (for any other rect-to-rect transform).
static bool shouldFilterRect(const SkMatrix& matrix, const SkRect& srcRect, const SkRect& dstRect) {
if (!matrix.rectStaysRect()) return true;
SkRect dstDevRect = matrix.mapRect(dstRect);
float dstW, dstH;
if (MathUtils::isZero(matrix.getScaleX()) && MathUtils::isZero(matrix.getScaleY())) {
// Has a 90 or 270 degree rotation, although total matrix may also have scale factors
// in m10 and m01. Those scalings are automatically handled by mapRect so comparing
// dimensions is sufficient, but swap width and height comparison.
dstW = dstDevRect.height();
dstH = dstDevRect.width();
} else {
// Handle H/V flips or 180 rotation matrices. Axes may have been mirrored, but
// dimensions are still safe to compare directly.
dstW = dstDevRect.width();
dstH = dstDevRect.height();
}
if (!(MathUtils::areEqual(dstW, srcRect.width()) &&
MathUtils::areEqual(dstH, srcRect.height()))) {
return true;
}
// Device rect and source rect should be integer aligned to ensure there's no difference
// in how nearest-neighbor sampling is resolved.
return !(isIntegerAligned(srcRect.x()) &&
isIntegerAligned(srcRect.y()) &&
isIntegerAligned(dstDevRect.x()) &&
isIntegerAligned(dstDevRect.y()));
}
void Layer::draw(SkCanvas* canvas) {
GrRecordingContext* context = canvas->recordingContext();
if (context == nullptr) {
SkDEBUGF(("Attempting to draw LayerDrawable into an unsupported surface"));
return;
}
SkMatrix layerTransform = getTransform();
//sk_sp<SkImage> layerImage = getImage();
const int layerWidth = getWidth();
const int layerHeight = getHeight();
if (layerImage) {
SkMatrix textureMatrixInv;
textureMatrixInv = getTexTransform();
// TODO: after skia bug https://bugs.chromium.org/p/skia/issues/detail?id=7075 is fixed
// use bottom left origin and remove flipV and invert transformations.
SkMatrix flipV;
flipV.setAll(1, 0, 0, 0, -1, 1, 0, 0, 1);
textureMatrixInv.preConcat(flipV);
textureMatrixInv.preScale(1.0f / layerWidth, 1.0f / layerHeight);
textureMatrixInv.postScale(layerImage->width(), layerImage->height());
SkMatrix textureMatrix;
if (!textureMatrixInv.invert(&textureMatrix)) {
textureMatrix = textureMatrixInv;
}
SkMatrix matrix;
matrix = SkMatrix::Concat(layerTransform, textureMatrix);
SkPaint paint;
paint.setAlpha(getAlpha());
paint.setBlendMode(getMode());
paint.setColorFilter(getColorFilter());
const bool nonIdentityMatrix = !matrix.isIdentity();
if (nonIdentityMatrix) {
canvas->save();
canvas->concat(matrix);
}
const SkMatrix& totalMatrix = canvas->getTotalMatrix();
SkRect imageRect = SkRect::MakeIWH(layerImage->width(), layerImage->height());
SkSamplingOptions sampling;
if (getForceFilter() || shouldFilterRect(totalMatrix, imageRect, imageRect)) {
sampling = SkSamplingOptions(SkFilterMode::kLinear);
}
canvas->drawImage(layerImage.get(), 0, 0, sampling, &paint);
// restore the original matrix
if (nonIdentityMatrix) {
canvas->restore();
}
}
}
} // namespace uirenderer
} // namespace android
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