зеркало из https://github.com/mozilla/gecko-dev.git
61 строка
2.1 KiB
C++
61 строка
2.1 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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 "LayersHelpers.h"
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namespace mozilla {
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namespace layers {
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using namespace gfx;
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gfx::IntRect
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ComputeBackdropCopyRect(const gfx::Rect& aRect,
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const gfx::IntRect& aClipRect,
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const gfx::Matrix4x4& aTransform,
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const gfx::IntRect& aRenderTargetRect,
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gfx::Matrix4x4* aOutTransform,
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gfx::Rect* aOutLayerQuad)
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{
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// Compute the clip.
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IntPoint rtOffset = aRenderTargetRect.TopLeft();
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IntSize rtSize = aRenderTargetRect.Size();
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gfx::IntRect renderBounds(0, 0, rtSize.width, rtSize.height);
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renderBounds.IntersectRect(renderBounds, aClipRect);
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renderBounds.MoveBy(rtOffset);
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// Apply the layer transform.
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RectDouble dest = aTransform.TransformAndClipBounds(
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RectDouble(aRect.X(), aRect.Y(), aRect.Width(), aRect.Height()),
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RectDouble(renderBounds.X(), renderBounds.Y(), renderBounds.Width(), renderBounds.Height()));
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dest -= rtOffset;
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// Ensure we don't round out to -1, which trips up Direct3D.
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dest.IntersectRect(dest, RectDouble(0, 0, rtSize.width, rtSize.height));
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if (aOutLayerQuad) {
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*aOutLayerQuad = Rect(dest.X(), dest.Y(), dest.Width(), dest.Height());
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}
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// Round out to integer.
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IntRect result;
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dest.RoundOut();
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dest.ToIntRect(&result);
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// Create a transform from adjusted clip space to render target space,
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// translate it for the backdrop rect, then transform it into the backdrop's
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// uv-space.
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Matrix4x4 transform;
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transform.PostScale(rtSize.width, rtSize.height, 1.0);
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transform.PostTranslate(-result.X(), -result.Y(), 0.0);
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transform.PostScale(1 / float(result.Width()), 1 / float(result.Height()), 1.0);
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*aOutTransform = transform;
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return result;
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}
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} // namespace layers
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} // namespace mozilla
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