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Bug 826093 (Part 1) - Add ClippedImage. r=joe
--HG-- extra : rebase_source : 2a7bb09ee0b1c221b4b57c5d201c282f5c6f52fb
This commit is contained in:
Seth Fowler
parent
057e2ec64f
commit
f0e2aed71d
347
image/src/ClippedImage.cpp
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347
image/src/ClippedImage.cpp
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@ -0,0 +1,347 @@
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "gfxDrawable.h"
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#include "gfxPlatform.h"
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#include "gfxUtils.h"
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#include "ClippedImage.h"
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using mozilla::layers::LayerManager;
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using mozilla::layers::ImageContainer;
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namespace mozilla {
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namespace image {
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class DrawSingleTileCallback : public gfxDrawingCallback
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{
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public:
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DrawSingleTileCallback(ClippedImage* aImage,
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const nsIntRect& aClip,
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const nsIntSize& aViewportSize,
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const SVGImageContext* aSVGContext,
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uint32_t aWhichFrame,
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uint32_t aFlags)
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: mImage(aImage)
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, mClip(aClip)
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, mViewportSize(aViewportSize)
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, mSVGContext(aSVGContext)
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, mWhichFrame(aWhichFrame)
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, mFlags(aFlags)
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{
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MOZ_ASSERT(mImage, "Must have an image to clip");
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}
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virtual bool operator()(gfxContext* aContext,
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const gfxRect& aFillRect,
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const gfxPattern::GraphicsFilter& aFilter,
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const gfxMatrix& aTransform)
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{
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// Draw the image. |gfxCallbackDrawable| always calls this function with
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// arguments that guarantee we never tile.
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mImage->DrawSingleTile(aContext, aFilter, aTransform, aFillRect, mClip,
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mViewportSize, mSVGContext, mWhichFrame, mFlags);
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return true;
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}
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private:
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nsRefPtr<ClippedImage> mImage;
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const nsIntRect mClip;
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const nsIntSize mViewportSize;
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const SVGImageContext* mSVGContext;
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const uint32_t mWhichFrame;
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const uint32_t mFlags;
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};
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ClippedImage::ClippedImage(Image* aImage,
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nsIntRect aClip)
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: ImageWrapper(aImage)
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, mClip(aClip)
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{
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MOZ_ASSERT(aImage != nullptr, "ClippedImage requires an existing Image");
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}
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bool
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ClippedImage::ShouldClip()
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{
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// We need to evaluate the clipping region against the image's width and height
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// once they're available to determine if it's valid and whether we actually
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// need to do any work. We may fail if the image's width and height aren't
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// available yet, in which case we'll try again later.
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if (mShouldClip.empty()) {
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int32_t width, height;
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if (InnerImage()->HasError()) {
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// If there's a problem with the inner image we'll let it handle everything.
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mShouldClip.construct(false);
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} else if (NS_SUCCEEDED(InnerImage()->GetWidth(&width)) && width > 0 &&
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NS_SUCCEEDED(InnerImage()->GetHeight(&height)) && height > 0) {
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// Clamp the clipping region to the size of the underlying image.
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mClip = mClip.Intersect(nsIntRect(0, 0, width, height));
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// If the clipping region is the same size as the underlying image we
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// don't have to do anything.
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mShouldClip.construct(!mClip.IsEqualInterior(nsIntRect(0, 0, width, height)));
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} else if (InnerImage()->GetStatusTracker().IsLoading()) {
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// The image just hasn't finished loading yet. We don't yet know whether
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// clipping with be needed or not for now. Just return without memoizing
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// anything.
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return false;
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} else {
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// We have a fully loaded image without a clearly defined width and
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// height. This can happen with SVG images.
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mShouldClip.construct(false);
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}
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}
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MOZ_ASSERT(!mShouldClip.empty(), "Should have computed a result");
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return mShouldClip.ref();
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}
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NS_IMPL_ISUPPORTS1(ClippedImage, imgIContainer)
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nsIntRect
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ClippedImage::FrameRect(uint32_t aWhichFrame)
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{
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if (!ShouldClip()) {
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return InnerImage()->FrameRect(aWhichFrame);
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}
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return nsIntRect(0, 0, mClip.width, mClip.height);
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}
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NS_IMETHODIMP
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ClippedImage::GetWidth(int32_t* aWidth)
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{
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if (!ShouldClip()) {
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return InnerImage()->GetWidth(aWidth);
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}
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*aWidth = mClip.width;
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return NS_OK;
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}
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NS_IMETHODIMP
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ClippedImage::GetHeight(int32_t* aHeight)
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{
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if (!ShouldClip()) {
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return InnerImage()->GetHeight(aHeight);
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}
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*aHeight = mClip.height;
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return NS_OK;
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}
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NS_IMETHODIMP
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ClippedImage::GetIntrinsicSize(nsSize* aSize)
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{
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if (!ShouldClip()) {
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return InnerImage()->GetIntrinsicSize(aSize);
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}
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*aSize = nsSize(mClip.width, mClip.height);
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return NS_OK;
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}
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NS_IMETHODIMP
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ClippedImage::GetIntrinsicRatio(nsSize* aRatio)
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{
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if (!ShouldClip()) {
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return InnerImage()->GetIntrinsicRatio(aRatio);
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}
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*aRatio = nsSize(mClip.width, mClip.height);
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return NS_OK;
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}
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NS_IMETHODIMP
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ClippedImage::GetFrame(uint32_t aWhichFrame,
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uint32_t aFlags,
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gfxASurface** _retval)
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{
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return GetFrameInternal(mClip.Size(), nullptr, aWhichFrame, aFlags, _retval);
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}
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nsresult
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ClippedImage::GetFrameInternal(const nsIntSize& aViewportSize,
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const SVGImageContext* aSVGContext,
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uint32_t aWhichFrame,
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uint32_t aFlags,
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gfxASurface** _retval)
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{
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if (!ShouldClip()) {
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return InnerImage()->GetFrame(aWhichFrame, aFlags, _retval);
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}
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// Create a surface to draw into.
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gfxImageSurface::gfxImageFormat format = gfxASurface::ImageFormatARGB32;
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nsRefPtr<gfxASurface> surface = gfxPlatform::GetPlatform()
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->CreateOffscreenSurface(gfxIntSize(mClip.width, mClip.height),
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gfxImageSurface::ContentFromFormat(format));
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// Create our callback.
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nsRefPtr<gfxDrawingCallback> drawTileCallback =
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new DrawSingleTileCallback(this, mClip, aViewportSize, aSVGContext, aWhichFrame, aFlags);
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nsRefPtr<gfxDrawable> drawable =
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new gfxCallbackDrawable(drawTileCallback, mClip.Size());
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// Actually draw. The callback will end up invoking DrawSingleTile.
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nsRefPtr<gfxContext> ctx = new gfxContext(surface);
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gfxRect imageRect(0, 0, mClip.width, mClip.height);
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gfxUtils::DrawPixelSnapped(ctx, drawable, gfxMatrix(),
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imageRect, imageRect, imageRect, imageRect,
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gfxASurface::ImageFormatARGB32, gfxPattern::FILTER_FAST);
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*_retval = surface.forget().get();
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return NS_OK;
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}
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NS_IMETHODIMP
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ClippedImage::GetImageContainer(LayerManager* aManager, ImageContainer** _retval)
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{
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// XXX(seth): We currently don't have a way of clipping the result of
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// GetImageContainer. We work around this by always returning null, but if it
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// ever turns out that ClippedImage is widely used on codepaths that can
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// actually benefit from GetImageContainer, it would be a good idea to fix
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// that method for performance reasons.
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*_retval = nullptr;
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return NS_OK;
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}
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NS_IMETHODIMP
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ClippedImage::ExtractFrame(uint32_t /* aWhichFrame */,
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const nsIntRect& /* aRegion */,
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uint32_t /* aFlags */,
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imgIContainer** /* _retval */)
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{
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// XXX(seth): This method has to be present in this patch because we haven't
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// gotten to the point where we can remove ExtractFrame yet, but implementing
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// it would be a waste of effort.
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MOZ_ASSERT(false, "ClippedImage::ExtractFrame shouldn't be called");
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return NS_ERROR_NOT_AVAILABLE;
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}
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bool
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ClippedImage::MustCreateSurface(gfxContext* aContext,
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const gfxMatrix& aTransform,
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const gfxRect& aSourceRect,
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const nsIntRect& aSubimage,
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const uint32_t aFlags) const
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{
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gfxRect gfxImageRect(0, 0, mClip.width, mClip.height);
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nsIntRect intImageRect(0, 0, mClip.width, mClip.height);
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bool willTile = !gfxImageRect.Contains(aSourceRect) &&
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!(aFlags & imgIContainer::FLAG_CLAMP);
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bool willResample = (aContext->CurrentMatrix().HasNonIntegerTranslation() ||
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aTransform.HasNonIntegerTranslation()) &&
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(willTile || !aSubimage.Contains(intImageRect));
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return willTile || willResample;
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}
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NS_IMETHODIMP
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ClippedImage::Draw(gfxContext* aContext,
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gfxPattern::GraphicsFilter aFilter,
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const gfxMatrix& aUserSpaceToImageSpace,
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const gfxRect& aFill,
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const nsIntRect& aSubimage,
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const nsIntSize& aViewportSize,
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const SVGImageContext* aSVGContext,
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uint32_t aWhichFrame,
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uint32_t aFlags)
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{
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if (!ShouldClip()) {
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return InnerImage()->Draw(aContext, aFilter, aUserSpaceToImageSpace,
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aFill, aSubimage, aViewportSize, aSVGContext,
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aWhichFrame, aFlags);
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}
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// Check for tiling. If we need to tile then we need to create a
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// gfxCallbackDrawable to handle drawing for us.
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gfxRect sourceRect = aUserSpaceToImageSpace.Transform(aFill);
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if (MustCreateSurface(aContext, aUserSpaceToImageSpace, sourceRect, aSubimage, aFlags)) {
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// Create a temporary surface containing a single tile of this image.
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// GetFrame will call DrawSingleTile internally.
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nsRefPtr<gfxASurface> surface;
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GetFrameInternal(aViewportSize, aSVGContext, aWhichFrame, aFlags, getter_AddRefs(surface));
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NS_ENSURE_TRUE(surface, NS_ERROR_FAILURE);
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// Create a drawable from that surface.
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nsRefPtr<gfxSurfaceDrawable> drawable =
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new gfxSurfaceDrawable(surface, gfxIntSize(mClip.width, mClip.height));
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// Draw.
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gfxRect imageRect(0, 0, mClip.width, mClip.height);
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gfxRect subimage(aSubimage.x, aSubimage.y, aSubimage.width, aSubimage.height);
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gfxUtils::DrawPixelSnapped(aContext, drawable, aUserSpaceToImageSpace,
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subimage, sourceRect, imageRect, aFill,
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gfxASurface::ImageFormatARGB32, aFilter);
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return NS_OK;
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}
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// Determine the appropriate subimage for the inner image.
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nsIntRect innerSubimage(aSubimage);
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innerSubimage.MoveBy(mClip.x, mClip.y);
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innerSubimage.Intersect(mClip);
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return DrawSingleTile(aContext, aFilter, aUserSpaceToImageSpace, aFill, innerSubimage,
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aViewportSize, aSVGContext, aWhichFrame, aFlags);
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}
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gfxFloat
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ClippedImage::ClampFactor(const gfxFloat aToClamp, const int aReference) const
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{
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return aToClamp > aReference ? aReference / aToClamp
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: 1.0;
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}
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nsresult
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ClippedImage::DrawSingleTile(gfxContext* aContext,
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gfxPattern::GraphicsFilter aFilter,
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const gfxMatrix& aUserSpaceToImageSpace,
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const gfxRect& aFill,
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const nsIntRect& aSubimage,
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const nsIntSize& aViewportSize,
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const SVGImageContext* aSVGContext,
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uint32_t aWhichFrame,
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uint32_t aFlags)
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{
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MOZ_ASSERT(!MustCreateSurface(aContext, aUserSpaceToImageSpace,
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aUserSpaceToImageSpace.Transform(aFill),
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aSubimage - nsIntPoint(mClip.x, mClip.y), aFlags),
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"DrawSingleTile shouldn't need to create a surface");
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// Make the viewport reflect the original image's size.
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nsIntSize viewportSize(aViewportSize);
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int32_t imgWidth, imgHeight;
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if (NS_SUCCEEDED(InnerImage()->GetWidth(&imgWidth)) &&
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NS_SUCCEEDED(InnerImage()->GetHeight(&imgHeight))) {
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viewportSize = nsIntSize(imgWidth, imgHeight);
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} else {
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MOZ_ASSERT(false, "If ShouldClip() led us to draw then we should never get here");
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}
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// Add a translation to the transform to reflect the clipping region.
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gfxMatrix transform(aUserSpaceToImageSpace);
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transform.Multiply(gfxMatrix().Translate(gfxPoint(mClip.x, mClip.y)));
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// "Clamp the source rectangle" to the clipping region's width and height.
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// Really, this means modifying the transform to get the results we want.
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gfxRect sourceRect = transform.Transform(aFill);
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if (sourceRect.width > mClip.width || sourceRect.height > mClip.height) {
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gfxMatrix clampSource;
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clampSource.Translate(gfxPoint(sourceRect.x, sourceRect.y));
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clampSource.Scale(ClampFactor(sourceRect.width, mClip.width),
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ClampFactor(sourceRect.height, mClip.height));
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clampSource.Translate(gfxPoint(-sourceRect.x, -sourceRect.y));
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transform.Multiply(clampSource);
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}
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return InnerImage()->Draw(aContext, aFilter, transform, aFill, aSubimage,
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viewportSize, aSVGContext, aWhichFrame, aFlags);
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}
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} // namespace image
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} // namespace mozilla
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91
image/src/ClippedImage.h
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91
image/src/ClippedImage.h
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@ -0,0 +1,91 @@
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef MOZILLA_IMAGELIB_CLIPPEDIMAGE_H_
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#define MOZILLA_IMAGELIB_CLIPPEDIMAGE_H_
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#include "ImageWrapper.h"
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namespace mozilla {
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namespace image {
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class DrawSingleTileCallback;
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/**
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* An Image wrapper that clips an image against a rectangle. Right now only
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* absolute coordinates in pixels are supported.
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*
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* XXX(seth): There a known (performance, not correctness) issue with
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* GetImageContainer. See the comments for that method for more information.
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*/
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class ClippedImage : public ImageWrapper
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{
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public:
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NS_DECL_ISUPPORTS
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virtual ~ClippedImage() { }
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virtual nsIntRect FrameRect(uint32_t aWhichFrame) MOZ_OVERRIDE;
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NS_IMETHOD GetWidth(int32_t* aWidth) MOZ_OVERRIDE;
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NS_IMETHOD GetHeight(int32_t* aHeight) MOZ_OVERRIDE;
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NS_IMETHOD GetIntrinsicSize(nsSize* aSize) MOZ_OVERRIDE;
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NS_IMETHOD GetIntrinsicRatio(nsSize* aRatio) MOZ_OVERRIDE;
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NS_IMETHOD GetFrame(uint32_t aWhichFrame,
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uint32_t aFlags,
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gfxASurface** _retval) MOZ_OVERRIDE;
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NS_IMETHOD GetImageContainer(mozilla::layers::LayerManager* aManager,
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mozilla::layers::ImageContainer** _retval) MOZ_OVERRIDE;
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NS_IMETHOD ExtractFrame(uint32_t aWhichFrame,
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const nsIntRect& aRegion,
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uint32_t aFlags,
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imgIContainer** _retval) MOZ_OVERRIDE;
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NS_IMETHOD Draw(gfxContext* aContext,
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gfxPattern::GraphicsFilter aFilter,
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const gfxMatrix& aUserSpaceToImageSpace,
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const gfxRect& aFill,
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const nsIntRect& aSubimage,
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const nsIntSize& aViewportSize,
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const SVGImageContext* aSVGContext,
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uint32_t aWhichFrame,
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uint32_t aFlags) MOZ_OVERRIDE;
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protected:
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ClippedImage(Image* aImage, nsIntRect aClip);
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private:
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nsresult GetFrameInternal(const nsIntSize& aViewportSize,
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const SVGImageContext* aSVGContext,
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uint32_t aWhichFrame,
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uint32_t aFlags,
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gfxASurface** _retval);
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bool ShouldClip();
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bool MustCreateSurface(gfxContext* aContext,
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const gfxMatrix& aTransform,
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const gfxRect& aSourceRect,
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const nsIntRect& aSubimage,
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const uint32_t aFlags) const;
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gfxFloat ClampFactor(const gfxFloat aToClamp, const int aReference) const;
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nsresult DrawSingleTile(gfxContext* aContext,
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gfxPattern::GraphicsFilter aFilter,
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const gfxMatrix& aUserSpaceToImageSpace,
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const gfxRect& aFill,
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const nsIntRect& aSubimage,
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const nsIntSize& aViewportSize,
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const SVGImageContext* aSVGContext,
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uint32_t aWhichFrame,
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uint32_t aFlags);
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nsIntRect mClip; // The region to clip to.
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Maybe<bool> mShouldClip; // Memoized ShouldClip() if present.
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friend class DrawSingleTileCallback;
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friend class ImageFactory;
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};
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} // namespace image
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} // namespace mozilla
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#endif // MOZILLA_IMAGELIB_CLIPPEDIMAGE_H_
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@ -27,6 +27,7 @@ CPPSRCS = \
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ImageFactory.cpp \
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ImageMetadata.cpp \
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ImageWrapper.cpp \
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ClippedImage.cpp \
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Decoder.cpp \
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DiscardTracker.cpp \
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FrozenImage.cpp \
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||||
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Reference in New Issue
Block a user