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Diffstat (limited to 'image/OrientedImage.cpp')
| -rw-r--r-- | image/OrientedImage.cpp | 354 |
1 files changed, 354 insertions, 0 deletions
diff --git a/image/OrientedImage.cpp b/image/OrientedImage.cpp new file mode 100644 index 000000000..9489ceafd --- /dev/null +++ b/image/OrientedImage.cpp @@ -0,0 +1,354 @@ +/* -*- 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 |