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/*
* Copyright (C) 2016 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 "LayerDrawable.h"
#include <utils/MathUtils.h>
#include "GrBackendSurface.h"
#include "SkColorFilter.h"
#include "SkSurface.h"
#include "gl/GrGLTypes.h"
namespace android {
namespace uirenderer {
namespace skiapipeline {
void LayerDrawable::onDraw(SkCanvas* canvas) {
Layer* layer = mLayerUpdater->backingLayer();
if (layer) {
DrawLayer(canvas->recordingContext(), canvas, layer, nullptr, nullptr, true);
}
}
static inline SkScalar isIntegerAligned(SkScalar x) {
return fabsf(roundf(x) - x) <= NON_ZERO_EPSILON;
}
// 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()));
}
// TODO: Context arg probably doesn't belong here – do debug check at callsite instead.
bool LayerDrawable::DrawLayer(GrRecordingContext* context,
SkCanvas* canvas,
Layer* layer,
const SkRect* srcRect,
const SkRect* dstRect,
bool useLayerTransform) {
if (context == nullptr) {
SkDEBUGF(("Attempting to draw LayerDrawable into an unsupported surface"));
return false;
}
// transform the matrix based on the layer
SkMatrix layerTransform = layer->getTransform();
sk_sp<SkImage> layerImage = layer->getImage();
const int layerWidth = layer->getWidth();
const int layerHeight = layer->getHeight();
if (layerImage) {
SkMatrix textureMatrixInv;
textureMatrixInv = layer->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;
if (useLayerTransform) {
matrix = SkMatrix::Concat(layerTransform, textureMatrix);
} else {
matrix = textureMatrix;
}
SkPaint paint;
paint.setAlpha(layer->getAlpha());
paint.setBlendMode(layer->getMode());
paint.setColorFilter(layer->getColorFilter());
const bool nonIdentityMatrix = !matrix.isIdentity();
if (nonIdentityMatrix) {
canvas->save();
canvas->concat(matrix);
}
const SkMatrix& totalMatrix = canvas->getTotalMatrix();
if (dstRect || srcRect) {
SkMatrix matrixInv;
if (!matrix.invert(&matrixInv)) {
matrixInv = matrix;
}
SkRect skiaSrcRect;
if (srcRect) {
skiaSrcRect = *srcRect;
} else {
skiaSrcRect = SkRect::MakeIWH(layerWidth, layerHeight);
}
matrixInv.mapRect(&skiaSrcRect);
SkRect skiaDestRect;
if (dstRect) {
skiaDestRect = *dstRect;
} else {
skiaDestRect = SkRect::MakeIWH(layerWidth, layerHeight);
}
matrixInv.mapRect(&skiaDestRect);
// If (matrix is a rect-to-rect transform)
// and (src/dst buffers size match in screen coordinates)
// and (src/dst corners align fractionally),
// then use nearest neighbor, otherwise use bilerp sampling.
// Skia TextureOp has the above logic build-in, but not NonAAFillRectOp. TextureOp works
// only for SrcOver blending and without color filter (readback uses Src blending).
if (layer->getForceFilter() ||
shouldFilterRect(totalMatrix, skiaSrcRect, skiaDestRect)) {
paint.setFilterQuality(kLow_SkFilterQuality);
}
canvas->drawImageRect(layerImage.get(), skiaSrcRect, skiaDestRect, &paint,
SkCanvas::kFast_SrcRectConstraint);
} else {
SkRect imageRect = SkRect::MakeIWH(layerImage->width(), layerImage->height());
if (layer->getForceFilter() || shouldFilterRect(totalMatrix, imageRect, imageRect)) {
paint.setFilterQuality(kLow_SkFilterQuality);
}
canvas->drawImage(layerImage.get(), 0, 0, &paint);
}
// restore the original matrix
if (nonIdentityMatrix) {
canvas->restore();
}
}
return layerImage != nullptr;
}
} // namespace skiapipeline
} // namespace uirenderer
} // namespace android
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