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