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/*
* 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 "ClassTracker.h"
#include "GLWebViewState.h"
#include "LayerAndroid.h"
#define LOW_RES_PREFETCH_SCALE_MODIFIER 0.3f
namespace WebCore {
SurfaceBacking::SurfaceBacking(bool isBaseSurface)
: m_frontTileGrid(new TileGrid(isBaseSurface))
, m_backTileGrid(new TileGrid(isBaseSurface))
, m_lowResTileGrid(new TileGrid(isBaseSurface))
, m_scale(-1)
, m_futureScale(-1)
, m_zooming(false)
, m_maxZoomScale(1)
{
#ifdef DEBUG_COUNT
ClassTracker::instance()->increment("SurfaceBacking");
#endif
}
SurfaceBacking::~SurfaceBacking()
{
delete m_frontTileGrid;
delete m_backTileGrid;
delete m_lowResTileGrid;
#ifdef DEBUG_COUNT
ClassTracker::instance()->decrement("SurfaceBacking");
#endif
}
void SurfaceBacking::prepareGL(GLWebViewState* state, float maxZoomScale,
const IntRect& prepareArea, const IntRect& fullContentArea,
TilePainter* painter, bool aggressiveRendering,
bool updateWithBlit)
{
// If the surface backing has ever zoomed beyond 1.0 scale, it's always
// allowed to (so repaints aren't necessary when allowZoom toggles). If not,
// and allowZoom is false, don't allow scale greater than 1.0
m_maxZoomScale = std::max(m_maxZoomScale, maxZoomScale);
float scale = state->scale();
bool scaleOverridden = false;
if (scale > m_maxZoomScale) {
scale = m_maxZoomScale;
scaleOverridden = true;
}
if (m_scale == -1) {
m_scale = scale;
m_futureScale = scale;
}
if (m_futureScale != scale) {
m_futureScale = scale;
if (scaleOverridden)
m_zoomUpdateTime = 0; // start rendering immediately
else
m_zoomUpdateTime = WTF::currentTime() + SurfaceBacking::s_zoomUpdateDelay;
m_zooming = true;
// release back TileGrid's TileTextures, so they can be reused immediately
m_backTileGrid->discardTextures();
}
int prepareRegionFlags = TileGrid::StandardRegion;
if (aggressiveRendering)
prepareRegionFlags |= TileGrid::ExpandedRegion;
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_frontTileGrid, m_backTileGrid);
if (m_zooming && (m_zoomUpdateTime < WTF::currentTime())) {
// prepare the visible portions of the back tile grid at the futureScale
m_backTileGrid->prepareGL(state, m_futureScale,
prepareArea, fullContentArea, painter,
TileGrid::StandardRegion, false);
if (m_backTileGrid->isReady()) {
// zooming completed, swap the TileGrids and new front tiles
swapTileGrids();
m_frontTileGrid->swapTiles();
m_backTileGrid->discardTextures();
m_lowResTileGrid->discardTextures();
m_scale = m_futureScale;
m_zooming = false;
// clear the StandardRegion flag, to prevent preparing it twice -
// the new frontTileGrid has already had its StandardRegion prepared
prepareRegionFlags &= ~TileGrid::StandardRegion;
}
}
if (!m_zooming) {
if (prepareRegionFlags) {
// if the front grid hasn't already prepared, or needs to prepare
// expanded bounds do so now
m_frontTileGrid->prepareGL(state, m_scale,
prepareArea, fullContentArea, painter,
prepareRegionFlags, false, updateWithBlit);
}
if (aggressiveRendering) {
// prepare low res content
float lowResPrefetchScale = m_scale * LOW_RES_PREFETCH_SCALE_MODIFIER;
m_lowResTileGrid->prepareGL(state, lowResPrefetchScale,
prepareArea, fullContentArea, painter,
TileGrid::StandardRegion | TileGrid::ExpandedRegion, true);
m_lowResTileGrid->swapTiles();
}
}
}
void SurfaceBacking::drawGL(const IntRect& visibleContentArea, float opacity,
const TransformationMatrix* transform,
bool aggressiveRendering, const Color* background)
{
// draw low res prefetch page if zooming or front texture missing content
if (aggressiveRendering && isMissingContent())
m_lowResTileGrid->drawGL(visibleContentArea, opacity, transform);
m_frontTileGrid->drawGL(visibleContentArea, opacity, transform, background);
}
void SurfaceBacking::markAsDirty(const SkRegion& dirtyArea)
{
m_backTileGrid->markAsDirty(dirtyArea);
m_frontTileGrid->markAsDirty(dirtyArea);
m_lowResTileGrid->markAsDirty(dirtyArea);
}
bool SurfaceBacking::swapTiles()
{
bool swap = m_backTileGrid->swapTiles();
swap |= m_frontTileGrid->swapTiles();
swap |= m_lowResTileGrid->swapTiles();
return swap;
}
void SurfaceBacking::computeTexturesAmount(TexturesResult* result,
const IntRect& visibleContentArea,
const IntRect& fullContentArea,
LayerAndroid* layer)
{
// get two numbers here:
// - textures needed for a clipped area
// - textures needed for an un-clipped area
TileGrid* tileGrid = m_zooming ? m_backTileGrid : m_frontTileGrid;
int nbTexturesUnclipped = tileGrid->nbTextures(fullContentArea, m_futureScale);
int nbTexturesClipped = tileGrid->nbTextures(visibleContentArea, m_futureScale);
if (layer) {
// TODO: should handle multi-layer case better
// 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 && layer->contentIsScrollable())
result->full += nbTexturesClipped;
else
result->full += nbTexturesUnclipped;
}
void SurfaceBacking::swapTileGrids()
{
TileGrid* temp = m_frontTileGrid;
m_frontTileGrid = m_backTileGrid;
m_backTileGrid = temp;
}
} // namespace WebCore
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