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Diffstat (limited to 'Source/WebCore/platform/graphics/android/SurfaceBacking.cpp')
| -rw-r--r-- | Source/WebCore/platform/graphics/android/SurfaceBacking.cpp | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/Source/WebCore/platform/graphics/android/SurfaceBacking.cpp b/Source/WebCore/platform/graphics/android/SurfaceBacking.cpp new file mode 100644 index 0000000..7c8f570 --- /dev/null +++ b/Source/WebCore/platform/graphics/android/SurfaceBacking.cpp @@ -0,0 +1,171 @@ +/* + * Copyright 2011, The Android Open Source Project + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY + * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR + * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY + * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#define LOG_TAG "SurfaceBacking" +#define LOG_NDEBUG 1 + +#include "config.h" +#include "SurfaceBacking.h" + +#include "AndroidLog.h" +#include "Color.h" +#include "GLWebViewState.h" +#include "LayerAndroid.h" + +#define LOW_RES_PREFETCH_SCALE_MODIFIER 0.3f + +namespace WebCore { + +SurfaceBacking::SurfaceBacking(bool isBaseSurface) +{ + m_frontTexture = new TileGrid(isBaseSurface); + m_backTexture = new TileGrid(isBaseSurface); + m_scale = -1; + m_futureScale = -1; + m_zooming = false; +} + +SurfaceBacking::~SurfaceBacking() +{ + delete m_frontTexture; + delete m_backTexture; +} + +void SurfaceBacking::prepareGL(GLWebViewState* state, bool allowZoom, + const IntRect& prepareArea, const IntRect& unclippedArea, + TilePainter* painter, bool aggressiveRendering) +{ + float scale = state->scale(); + if (scale > 1 && !allowZoom) + scale = 1; + + if (m_scale == -1) { + m_scale = scale; + m_futureScale = scale; + } + + if (m_futureScale != scale) { + m_futureScale = scale; + m_zoomUpdateTime = WTF::currentTime() + SurfaceBacking::s_zoomUpdateDelay; + m_zooming = true; + } + + bool useExpandPrefetch = aggressiveRendering; + ALOGV("Prepare SurfBack %p, scale %.2f, m_scale %.2f, futScale: %.2f, zooming: %d, f %p, b %p", + this, scale, m_scale, m_futureScale, m_zooming, + m_frontTexture, m_backTexture); + + if (!m_zooming) { + m_frontTexture->prepareGL(state, m_scale, + prepareArea, unclippedArea, painter, false, useExpandPrefetch); + if (aggressiveRendering) { + // prepare the back tiled texture to render content in low res + float lowResPrefetchScale = m_scale * LOW_RES_PREFETCH_SCALE_MODIFIER; + m_backTexture->prepareGL(state, lowResPrefetchScale, + prepareArea, unclippedArea, painter, true, useExpandPrefetch); + m_backTexture->swapTiles(); + } + } else if (m_zoomUpdateTime < WTF::currentTime()) { + m_backTexture->prepareGL(state, m_futureScale, + prepareArea, unclippedArea, painter, false, useExpandPrefetch); + if (m_backTexture->isReady()) { + // zooming completed, swap the textures and new front tiles + swapTileGrids(); + + m_frontTexture->swapTiles(); + m_backTexture->discardTextures(); + + m_scale = m_futureScale; + m_zooming = false; + } + } +} + +void SurfaceBacking::drawGL(const IntRect& visibleArea, float opacity, + const TransformationMatrix* transform, + bool aggressiveRendering, const Color* background) +{ + // draw low res prefetch page, if needed + if (aggressiveRendering && !m_zooming && m_frontTexture->isMissingContent()) + m_backTexture->drawGL(visibleArea, opacity, transform); + + m_frontTexture->drawGL(visibleArea, opacity, transform, background); +} + +void SurfaceBacking::markAsDirty(const SkRegion& dirtyArea) +{ + m_backTexture->markAsDirty(dirtyArea); + m_frontTexture->markAsDirty(dirtyArea); +} + +void SurfaceBacking::swapTiles() +{ + m_backTexture->swapTiles(); + m_frontTexture->swapTiles(); +} + +void SurfaceBacking::computeTexturesAmount(TexturesResult* result, LayerAndroid* layer) +{ + // TODO: shouldn't use layer, as this SB may paint multiple layers + if (!layer) + return; + + IntRect unclippedArea = layer->unclippedArea(); + IntRect clippedVisibleArea = layer->visibleArea(); + + // get two numbers here: + // - textures needed for a clipped area + // - textures needed for an un-clipped area + TileGrid* tiledTexture = m_zooming ? m_backTexture : m_frontTexture; + int nbTexturesUnclipped = tiledTexture->nbTextures(unclippedArea, m_scale); + int nbTexturesClipped = tiledTexture->nbTextures(clippedVisibleArea, m_scale); + + // Set kFixedLayers level + if (layer->isPositionFixed()) + result->fixed += nbTexturesClipped; + + // Set kScrollableAndFixedLayers level + if (layer->contentIsScrollable() + || layer->isPositionFixed()) + result->scrollable += nbTexturesClipped; + + // Set kClippedTextures level + result->clipped += nbTexturesClipped; + + // Set kAllTextures level + if (layer->contentIsScrollable()) + result->full += nbTexturesClipped; + else + result->full += nbTexturesUnclipped; +} + +void SurfaceBacking::swapTileGrids() +{ + TileGrid* temp = m_frontTexture; + m_frontTexture = m_backTexture; + m_backTexture = temp; +} + +} // namespace WebCore |