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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "ImageLayers.h"
#include "ImageContainer.h" // for ImageContainer
#include "gfxRect.h" // for gfxRect
#include "nsDebug.h" // for NS_ASSERTION
#include "nsISupportsImpl.h" // for ImageContainer::Release, etc
#include "gfx2DGlue.h"
namespace mozilla {
namespace layers {
ImageLayer::ImageLayer(LayerManager* aManager, void* aImplData)
: Layer(aManager, aImplData), mSamplingFilter(gfx::SamplingFilter::GOOD)
, mScaleMode(ScaleMode::SCALE_NONE)
{}
ImageLayer::~ImageLayer()
{}
void ImageLayer::SetContainer(ImageContainer* aContainer)
{
mContainer = aContainer;
}
void ImageLayer::ComputeEffectiveTransforms(const gfx::Matrix4x4& aTransformToSurface)
{
gfx::Matrix4x4 local = GetLocalTransform();
// Snap image edges to pixel boundaries
gfxRect sourceRect(0, 0, 0, 0);
if (mContainer) {
sourceRect.SizeTo(mContainer->GetCurrentSize());
}
// Snap our local transform first, and snap the inherited transform as well.
// This makes our snapping equivalent to what would happen if our content
// was drawn into a PaintedLayer (gfxContext would snap using the local
// transform, then we'd snap again when compositing the PaintedLayer).
mEffectiveTransform =
SnapTransform(local, sourceRect, nullptr) *
SnapTransformTranslation(aTransformToSurface, nullptr);
if (mScaleMode != ScaleMode::SCALE_NONE &&
sourceRect.width != 0.0 && sourceRect.height != 0.0) {
NS_ASSERTION(mScaleMode == ScaleMode::STRETCH,
"No other scalemodes than stretch and none supported yet.");
local.PreScale(mScaleToSize.width / sourceRect.width,
mScaleToSize.height / sourceRect.height, 1.0);
mEffectiveTransformForBuffer =
SnapTransform(local, sourceRect, nullptr) *
SnapTransformTranslation(aTransformToSurface, nullptr);
} else {
mEffectiveTransformForBuffer = mEffectiveTransform;
}
ComputeEffectiveTransformForMaskLayers(aTransformToSurface);
}
} // namespace layers
} // namespace mozilla
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