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-rw-r--r--image/OrientedImage.cpp354
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diff --git a/image/OrientedImage.cpp b/image/OrientedImage.cpp
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+++ b/image/OrientedImage.cpp
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+/* -*- Mode: C++; tab-width: 2; 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 "OrientedImage.h"
+
+#include <algorithm>
+
+#include "gfx2DGlue.h"
+#include "gfxDrawable.h"
+#include "gfxPlatform.h"
+#include "gfxUtils.h"
+#include "ImageRegion.h"
+#include "SVGImageContext.h"
+
+using std::swap;
+
+namespace mozilla {
+
+using namespace gfx;
+using layers::LayerManager;
+using layers::ImageContainer;
+
+namespace image {
+
+NS_IMPL_ISUPPORTS_INHERITED0(OrientedImage, ImageWrapper)
+
+NS_IMETHODIMP
+OrientedImage::GetWidth(int32_t* aWidth)
+{
+ if (mOrientation.SwapsWidthAndHeight()) {
+ return InnerImage()->GetHeight(aWidth);
+ } else {
+ return InnerImage()->GetWidth(aWidth);
+ }
+}
+
+NS_IMETHODIMP
+OrientedImage::GetHeight(int32_t* aHeight)
+{
+ if (mOrientation.SwapsWidthAndHeight()) {
+ return InnerImage()->GetWidth(aHeight);
+ } else {
+ return InnerImage()->GetHeight(aHeight);
+ }
+}
+
+NS_IMETHODIMP
+OrientedImage::GetIntrinsicSize(nsSize* aSize)
+{
+ nsresult rv = InnerImage()->GetIntrinsicSize(aSize);
+
+ if (mOrientation.SwapsWidthAndHeight()) {
+ swap(aSize->width, aSize->height);
+ }
+
+ return rv;
+}
+
+NS_IMETHODIMP
+OrientedImage::GetIntrinsicRatio(nsSize* aRatio)
+{
+ nsresult rv = InnerImage()->GetIntrinsicRatio(aRatio);
+
+ if (mOrientation.SwapsWidthAndHeight()) {
+ swap(aRatio->width, aRatio->height);
+ }
+
+ return rv;
+}
+
+NS_IMETHODIMP_(already_AddRefed<SourceSurface>)
+OrientedImage::GetFrame(uint32_t aWhichFrame,
+ uint32_t aFlags)
+{
+ nsresult rv;
+
+ if (mOrientation.IsIdentity()) {
+ return InnerImage()->GetFrame(aWhichFrame, aFlags);
+ }
+
+ // Get the underlying dimensions.
+ IntSize size;
+ rv = InnerImage()->GetWidth(&size.width);
+ NS_ENSURE_SUCCESS(rv, nullptr);
+ rv = InnerImage()->GetHeight(&size.height);
+ NS_ENSURE_SUCCESS(rv, nullptr);
+
+ // Determine an appropriate format for the surface.
+ gfx::SurfaceFormat surfaceFormat;
+ if (InnerImage()->WillDrawOpaqueNow()) {
+ surfaceFormat = gfx::SurfaceFormat::B8G8R8X8;
+ } else {
+ surfaceFormat = gfx::SurfaceFormat::B8G8R8A8;
+ }
+
+ // Create a surface to draw into.
+ RefPtr<DrawTarget> target =
+ gfxPlatform::GetPlatform()->
+ CreateOffscreenContentDrawTarget(size, surfaceFormat);
+ if (!target || !target->IsValid()) {
+ NS_ERROR("Could not create a DrawTarget");
+ return nullptr;
+ }
+
+
+ // Create our drawable.
+ RefPtr<SourceSurface> innerSurface =
+ InnerImage()->GetFrame(aWhichFrame, aFlags);
+ NS_ENSURE_TRUE(innerSurface, nullptr);
+ RefPtr<gfxDrawable> drawable =
+ new gfxSurfaceDrawable(innerSurface, size);
+
+ // Draw.
+ RefPtr<gfxContext> ctx = gfxContext::CreateOrNull(target);
+ MOZ_ASSERT(ctx); // already checked the draw target above
+ ctx->Multiply(OrientationMatrix(size));
+ gfxUtils::DrawPixelSnapped(ctx, drawable, size, ImageRegion::Create(size),
+ surfaceFormat, SamplingFilter::LINEAR);
+
+ return target->Snapshot();
+}
+
+NS_IMETHODIMP_(already_AddRefed<SourceSurface>)
+OrientedImage::GetFrameAtSize(const IntSize& aSize,
+ uint32_t aWhichFrame,
+ uint32_t aFlags)
+{
+ // XXX(seth): It'd be nice to support downscale-during-decode for this case,
+ // but right now we just fall back to the intrinsic size.
+ return GetFrame(aWhichFrame, aFlags);
+}
+
+NS_IMETHODIMP_(bool)
+OrientedImage::IsImageContainerAvailable(LayerManager* aManager, uint32_t aFlags)
+{
+ if (mOrientation.IsIdentity()) {
+ return InnerImage()->IsImageContainerAvailable(aManager, aFlags);
+ }
+ return false;
+}
+
+NS_IMETHODIMP_(already_AddRefed<ImageContainer>)
+OrientedImage::GetImageContainer(LayerManager* aManager, uint32_t aFlags)
+{
+ // XXX(seth): We currently don't have a way of orienting the result of
+ // GetImageContainer. We work around this by always returning null, but if it
+ // ever turns out that OrientedImage is widely used on codepaths that can
+ // actually benefit from GetImageContainer, it would be a good idea to fix
+ // that method for performance reasons.
+
+ if (mOrientation.IsIdentity()) {
+ return InnerImage()->GetImageContainer(aManager, aFlags);
+ }
+
+ return nullptr;
+}
+
+struct MatrixBuilder
+{
+ explicit MatrixBuilder(bool aInvert) : mInvert(aInvert) { }
+
+ gfxMatrix Build() { return mMatrix; }
+
+ void Scale(gfxFloat aX, gfxFloat aY)
+ {
+ if (mInvert) {
+ mMatrix *= gfxMatrix::Scaling(1.0 / aX, 1.0 / aY);
+ } else {
+ mMatrix.Scale(aX, aY);
+ }
+ }
+
+ void Rotate(gfxFloat aPhi)
+ {
+ if (mInvert) {
+ mMatrix *= gfxMatrix::Rotation(-aPhi);
+ } else {
+ mMatrix.Rotate(aPhi);
+ }
+ }
+
+ void Translate(gfxPoint aDelta)
+ {
+ if (mInvert) {
+ mMatrix *= gfxMatrix::Translation(-aDelta);
+ } else {
+ mMatrix.Translate(aDelta);
+ }
+ }
+
+private:
+ gfxMatrix mMatrix;
+ bool mInvert;
+};
+
+/*
+ * OrientationMatrix() computes a matrix that applies the rotation and
+ * reflection specified by mOrientation, or that matrix's inverse if aInvert is
+ * true.
+ *
+ * @param aSize The scaled size of the inner image. (When outside code specifies
+ * the scaled size, as with imgIContainer::Draw and its aSize
+ * parameter, it's necessary to swap the width and height if
+ * mOrientation.SwapsWidthAndHeight() is true.)
+ * @param aInvert If true, compute the inverse of the orientation matrix. Prefer
+ * this approach to OrientationMatrix(..).Invert(), because it's
+ * more numerically accurate.
+ */
+gfxMatrix
+OrientedImage::OrientationMatrix(const nsIntSize& aSize,
+ bool aInvert /* = false */)
+{
+ MatrixBuilder builder(aInvert);
+
+ // Apply reflection, if present. (This logically happens second, but we
+ // apply it first because these transformations are all premultiplied.) A
+ // translation is necessary to place the image back in the first quadrant.
+ switch (mOrientation.flip) {
+ case Flip::Unflipped:
+ break;
+ case Flip::Horizontal:
+ if (mOrientation.SwapsWidthAndHeight()) {
+ builder.Translate(gfxPoint(aSize.height, 0));
+ } else {
+ builder.Translate(gfxPoint(aSize.width, 0));
+ }
+ builder.Scale(-1.0, 1.0);
+ break;
+ default:
+ MOZ_ASSERT(false, "Invalid flip value");
+ }
+
+ // Apply rotation, if present. Again, a translation is used to place the
+ // image back in the first quadrant.
+ switch (mOrientation.rotation) {
+ case Angle::D0:
+ break;
+ case Angle::D90:
+ builder.Translate(gfxPoint(aSize.height, 0));
+ builder.Rotate(-1.5 * M_PI);
+ break;
+ case Angle::D180:
+ builder.Translate(gfxPoint(aSize.width, aSize.height));
+ builder.Rotate(-1.0 * M_PI);
+ break;
+ case Angle::D270:
+ builder.Translate(gfxPoint(0, aSize.width));
+ builder.Rotate(-0.5 * M_PI);
+ break;
+ default:
+ MOZ_ASSERT(false, "Invalid rotation value");
+ }
+
+ return builder.Build();
+}
+
+NS_IMETHODIMP_(DrawResult)
+OrientedImage::Draw(gfxContext* aContext,
+ const nsIntSize& aSize,
+ const ImageRegion& aRegion,
+ uint32_t aWhichFrame,
+ SamplingFilter aSamplingFilter,
+ const Maybe<SVGImageContext>& aSVGContext,
+ uint32_t aFlags)
+{
+ if (mOrientation.IsIdentity()) {
+ return InnerImage()->Draw(aContext, aSize, aRegion,
+ aWhichFrame, aSamplingFilter,
+ aSVGContext, aFlags);
+ }
+
+ // Update the image size to match the image's coordinate system. (This could
+ // be done using TransformBounds but since it's only a size a swap is enough.)
+ nsIntSize size(aSize);
+ if (mOrientation.SwapsWidthAndHeight()) {
+ swap(size.width, size.height);
+ }
+
+ // Update the matrix so that we transform the image into the orientation
+ // expected by the caller before drawing.
+ gfxMatrix matrix(OrientationMatrix(size));
+ gfxContextMatrixAutoSaveRestore saveMatrix(aContext);
+ aContext->Multiply(matrix);
+
+ // The region is already in the orientation expected by the caller, but we
+ // need it to be in the image's coordinate system, so we transform it using
+ // the inverse of the orientation matrix.
+ gfxMatrix inverseMatrix(OrientationMatrix(size, /* aInvert = */ true));
+ ImageRegion region(aRegion);
+ region.TransformBoundsBy(inverseMatrix);
+
+ auto orientViewport = [&](const SVGImageContext& aOldContext) {
+ CSSIntSize viewportSize(aOldContext.GetViewportSize());
+ if (mOrientation.SwapsWidthAndHeight()) {
+ swap(viewportSize.width, viewportSize.height);
+ }
+ return SVGImageContext(viewportSize,
+ aOldContext.GetPreserveAspectRatio());
+ };
+
+ return InnerImage()->Draw(aContext, size, region, aWhichFrame, aSamplingFilter,
+ aSVGContext.map(orientViewport), aFlags);
+}
+
+nsIntSize
+OrientedImage::OptimalImageSizeForDest(const gfxSize& aDest,
+ uint32_t aWhichFrame,
+ SamplingFilter aSamplingFilter,
+ uint32_t aFlags)
+{
+ if (!mOrientation.SwapsWidthAndHeight()) {
+ return InnerImage()->OptimalImageSizeForDest(aDest, aWhichFrame,
+ aSamplingFilter, aFlags);
+ }
+
+ // Swap the size for the calculation, then swap it back for the caller.
+ gfxSize destSize(aDest.height, aDest.width);
+ nsIntSize innerImageSize(InnerImage()->OptimalImageSizeForDest(destSize,
+ aWhichFrame,
+ aSamplingFilter,
+ aFlags));
+ return nsIntSize(innerImageSize.height, innerImageSize.width);
+}
+
+NS_IMETHODIMP_(nsIntRect)
+OrientedImage::GetImageSpaceInvalidationRect(const nsIntRect& aRect)
+{
+ nsIntRect rect(InnerImage()->GetImageSpaceInvalidationRect(aRect));
+
+ if (mOrientation.IsIdentity()) {
+ return rect;
+ }
+
+ nsIntSize innerSize;
+ nsresult rv = InnerImage()->GetWidth(&innerSize.width);
+ rv = NS_FAILED(rv) ? rv : InnerImage()->GetHeight(&innerSize.height);
+ if (NS_FAILED(rv)) {
+ // Fall back to identity if the width and height aren't available.
+ return rect;
+ }
+
+ // Transform the invalidation rect into the correct orientation.
+ gfxMatrix matrix(OrientationMatrix(innerSize));
+ gfxRect invalidRect(matrix.TransformBounds(gfxRect(rect.x, rect.y,
+ rect.width, rect.height)));
+
+ return IntRect::RoundOut(invalidRect.x, invalidRect.y,
+ invalidRect.width, invalidRect.height);
+}
+
+} // namespace image
+} // namespace mozilla