gfx/layers/ImageLayers.cpp
author Tor Arvid Lund <torarvid@comoyo.com>
Fri, 13 Dec 2013 18:32:02 +0100
changeset 160740 c4cb33486816b84ec21d13617088ef04e30fe879
parent 152782 a2eecdb6d6b0ced94b3ffe8a47d831173e390d90
child 165233 b9282cb0f9a7575e3189a3a0f5791334afb75db4
permissions -rw-r--r--
Bug 929513 - Replace some instances of gfxIntSize with gfx::IntSize r=nical

/* -*- 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 "gfx3DMatrix.h"                // for gfx3DMatrix
#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), mFilter(GraphicsFilter::FILTER_GOOD)
, mScaleMode(SCALE_NONE), mDisallowBigImage(false)
{}

ImageLayer::~ImageLayer()
{}

void ImageLayer::SetContainer(ImageContainer* aContainer) 
{
  mContainer = aContainer;
}

void ImageLayer::ComputeEffectiveTransforms(const gfx3DMatrix& aTransformToSurface)
{
  gfx3DMatrix local = GetLocalTransform();

  // Snap image edges to pixel boundaries
  gfxRect sourceRect(0, 0, 0, 0);
  if (mContainer) {
    sourceRect.SizeTo(gfx::ThebesIntSize(mContainer->GetCurrentSize()));
    if (mScaleMode != SCALE_NONE &&
        sourceRect.width != 0.0 && sourceRect.height != 0.0) {
      NS_ASSERTION(mScaleMode == SCALE_STRETCH,
                   "No other scalemodes than stretch and none supported yet.");
      local.Scale(mScaleToSize.width / sourceRect.width,
                  mScaleToSize.height / sourceRect.height, 1.0);
    }
  }
  // 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 ThebesLayer (gfxContext would snap using the local
  // transform, then we'd snap again when compositing the ThebesLayer).
  mEffectiveTransform =
      SnapTransform(local, sourceRect, nullptr) *
      SnapTransformTranslation(aTransformToSurface, nullptr);
  ComputeEffectiveTransformForMaskLayer(aTransformToSurface);
}

}
}