mirror of
https://github.com/classilla/tenfourfox.git
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174 lines
4.4 KiB
C++
174 lines
4.4 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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#ifndef mozilla_image_ImageRegion_h
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#define mozilla_image_ImageRegion_h
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#include "gfxRect.h"
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#include "mozilla/gfx/Types.h"
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namespace mozilla {
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namespace image {
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/**
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* An axis-aligned rectangle in tiled image space, with an optional sampling
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* restriction rect. The drawing code ensures that if a sampling restriction
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* rect is present, any pixels sampled during the drawing process are found
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* within that rect.
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*
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* The sampling restriction rect exists primarily for callers which perform
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* pixel snapping. Other callers should generally use one of the Create()
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* overloads.
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*/
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class ImageRegion
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{
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typedef mozilla::gfx::ExtendMode ExtendMode;
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public:
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static ImageRegion Empty()
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{
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return ImageRegion(gfxRect(), ExtendMode::CLAMP);
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}
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static ImageRegion Create(const gfxRect& aRect,
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ExtendMode aExtendMode = ExtendMode::CLAMP)
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{
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return ImageRegion(aRect, aExtendMode);
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}
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static ImageRegion Create(const gfxSize& aSize,
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ExtendMode aExtendMode = ExtendMode::CLAMP)
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{
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return ImageRegion(gfxRect(0, 0, aSize.width, aSize.height), aExtendMode);
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}
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static ImageRegion Create(const nsIntSize& aSize,
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ExtendMode aExtendMode = ExtendMode::CLAMP)
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{
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return ImageRegion(gfxRect(0, 0, aSize.width, aSize.height), aExtendMode);
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}
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static ImageRegion CreateWithSamplingRestriction(const gfxRect& aRect,
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const gfxRect& aRestriction,
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ExtendMode aExtendMode = ExtendMode::CLAMP)
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{
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return ImageRegion(aRect, aRestriction, aExtendMode);
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}
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bool IsRestricted() const { return mIsRestricted; }
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const gfxRect& Rect() const { return mRect; }
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const gfxRect& Restriction() const
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{
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MOZ_ASSERT(mIsRestricted);
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return mRestriction;
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}
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bool RestrictionContains(const gfxRect& aRect) const
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{
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if (!mIsRestricted) {
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return true;
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}
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return mRestriction.Contains(aRect);
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}
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ImageRegion Intersect(const gfxRect& aRect) const
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{
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if (mIsRestricted) {
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return CreateWithSamplingRestriction(aRect.Intersect(mRect),
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aRect.Intersect(mRestriction));
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}
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return Create(aRect.Intersect(mRect));
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}
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gfxRect IntersectAndRestrict(const gfxRect& aRect) const
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{
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gfxRect intersection = mRect.Intersect(aRect);
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if (mIsRestricted) {
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intersection = mRestriction.Intersect(intersection);
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}
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return intersection;
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}
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void MoveBy(gfxFloat dx, gfxFloat dy)
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{
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mRect.MoveBy(dx, dy);
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if (mIsRestricted) {
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mRestriction.MoveBy(dx, dy);
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}
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}
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void Scale(gfxFloat sx, gfxFloat sy)
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{
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mRect.Scale(sx, sy);
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if (mIsRestricted) {
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mRestriction.Scale(sx, sy);
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}
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}
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void TransformBy(const gfxMatrix& aMatrix)
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{
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mRect = aMatrix.Transform(mRect);
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if (mIsRestricted) {
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mRestriction = aMatrix.Transform(mRestriction);
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}
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}
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void TransformBoundsBy(const gfxMatrix& aMatrix)
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{
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mRect = aMatrix.TransformBounds(mRect);
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if (mIsRestricted) {
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mRestriction = aMatrix.TransformBounds(mRestriction);
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}
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}
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ImageRegion operator-(const gfxPoint& aPt) const
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{
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if (mIsRestricted) {
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return CreateWithSamplingRestriction(mRect - aPt, mRestriction - aPt);
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}
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return Create(mRect - aPt);
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}
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ImageRegion operator+(const gfxPoint& aPt) const
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{
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if (mIsRestricted) {
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return CreateWithSamplingRestriction(mRect + aPt, mRestriction + aPt);
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}
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return Create(mRect + aPt);
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}
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gfx::ExtendMode GetExtendMode() const
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{
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return mExtendMode;
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}
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/* ImageRegion() : mIsRestricted(false) { } */
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private:
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explicit ImageRegion(const gfxRect& aRect, ExtendMode aExtendMode)
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: mRect(aRect)
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, mExtendMode(aExtendMode)
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, mIsRestricted(false)
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{ }
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ImageRegion(const gfxRect& aRect, const gfxRect& aRestriction, ExtendMode aExtendMode)
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: mRect(aRect)
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, mRestriction(aRestriction)
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, mExtendMode(aExtendMode)
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, mIsRestricted(true)
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{ }
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gfxRect mRect;
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gfxRect mRestriction;
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ExtendMode mExtendMode;
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bool mIsRestricted;
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};
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} // namespace image
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} // namespace mozilla
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#endif // mozilla_image_ImageRegion_h
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