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