void SurfaceBacking::prepareGL(GLWebViewState* state, float maxZoomScale,//4.2 Merge
const IntRect& prepareArea, const IntRect& fullContentArea,
TilePainter* painter, bool aggressiveRendering,
bool updateWithBlit)
{
// 4.2 Merge BEGIN <<
// 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);
// 4.2 Merge END >>
float scale = state->scale();
// 4.2 Merge BEGIN <<
bool scaleOverridden = false;
if (scale > m_maxZoomScale) {
scale = m_maxZoomScale;
scaleOverridden = true;
}
// 4.2 Merge END >>
if (m_scale == -1) {
m_scale = scale;
m_futureScale = scale;
}
if (m_futureScale != scale) {
m_futureScale = scale;
// 4.2 Merge BEGIN <<
if (scaleOverridden)
m_zoomUpdateTime = 0; // start rendering immediately
else
m_zoomUpdateTime = WTF::currentTime() + SurfaceBacking::s_zoomUpdateDelay;
// 4.2 Merge END >>
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::prepareGL(GLWebViewState* state, bool allowZoom,
const IntRect& prepareArea, const IntRect& fullContentArea,
TilePainter* painter, bool aggressiveRendering,
bool updateWithBlit)
{
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;
// 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();
}
}
}
