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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 "GlLayer.h"
#include "VkLayer.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->getGrContext(), canvas, layer);
}
}
bool LayerDrawable::DrawLayer(GrContext* context, SkCanvas* canvas, Layer* layer) {
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().copyTo(layerTransform);
sk_sp<SkImage> layerImage;
int layerWidth = layer->getWidth();
int layerHeight = layer->getHeight();
if (layer->getApi() == Layer::Api::OpenGL) {
GlLayer* glLayer = static_cast<GlLayer*>(layer);
GrGLTextureInfo externalTexture;
externalTexture.fTarget = glLayer->getRenderTarget();
externalTexture.fID = glLayer->getTextureId();
GrBackendTexture backendTexture(layerWidth, layerHeight, kRGBA_8888_GrPixelConfig,
externalTexture);
layerImage = SkImage::MakeFromTexture(context, backendTexture, kTopLeft_GrSurfaceOrigin,
kPremul_SkAlphaType, nullptr);
} else {
SkASSERT(layer->getApi() == Layer::Api::Vulkan);
VkLayer* vkLayer = static_cast<VkLayer*>(layer);
canvas->clear(SK_ColorGREEN);
layerImage = vkLayer->getImage();
}
if (layerImage) {
SkMatrix textureMatrix;
layer->getTexTransform().copyTo(textureMatrix);
// 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);
textureMatrix.preConcat(flipV);
textureMatrix.preScale(1.0f / layerWidth, 1.0f / layerHeight);
textureMatrix.postScale(layerWidth, layerHeight);
SkMatrix textureMatrixInv;
if (!textureMatrix.invert(&textureMatrixInv)) {
textureMatrixInv = textureMatrix;
}
SkMatrix matrix = SkMatrix::Concat(layerTransform, textureMatrixInv);
SkPaint paint;
paint.setAlpha(layer->getAlpha());
paint.setBlendMode(layer->getMode());
paint.setColorFilter(sk_ref_sp(layer->getColorFilter()));
const bool nonIdentityMatrix = !matrix.isIdentity();
if (nonIdentityMatrix) {
canvas->save();
canvas->concat(matrix);
}
canvas->drawImage(layerImage.get(), 0, 0, &paint);
// restore the original matrix
if (nonIdentityMatrix) {
canvas->restore();
}
}
return layerImage;
}
}; // namespace skiapipeline
}; // namespace uirenderer
}; // namespace android
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