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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 "ZoomManager"
#define LOG_NDEBUG 1
#include "config.h"
#include "ZoomManager.h"
#include "AndroidLog.h"
#include "GLWebViewState.h"
#if USE(ACCELERATED_COMPOSITING)
namespace WebCore {
using namespace android;
ZoomManager::ZoomManager(GLWebViewState* state)
: m_scaleRequestState(kNoScaleRequest)
, m_currentScale(-1)
, m_futureScale(-1)
, m_layersScale(-1)
, m_updateTime(-1)
, m_transitionTime(-1)
, m_glWebViewState(state)
{
}
void ZoomManager::scheduleUpdate(const double& currentTime,
const SkIRect& viewport, float scale)
{
// if no update time, set it
if (updateTime() == -1) {
m_scaleRequestState = kWillScheduleRequest;
setUpdateTime(currentTime + s_updateInitialDelay);
setFutureScale(scale);
m_glWebViewState->setFutureViewport(viewport);
return;
}
if (currentTime < updateTime())
return;
// we reached the scheduled update time, check if we can update
if (futureScale() == scale) {
// we are still with the previous scale, let's go
// with the update
m_scaleRequestState = kRequestNewScale;
setUpdateTime(-1);
} else {
// we reached the update time, but the planned update was for
// a different scale factor -- meaning the user is still probably
// in the process of zooming. Let's push the update time a bit.
setUpdateTime(currentTime + s_updateDelay);
setFutureScale(scale);
m_glWebViewState->setFutureViewport(viewport);
}
}
double ZoomManager::zoomInTransitionTime(double currentTime)
{
if (m_transitionTime == -1)
m_transitionTime = currentTime + s_zoomInTransitionDelay;
return m_transitionTime;
}
double ZoomManager::zoomOutTransitionTime(double currentTime)
{
if (m_transitionTime == -1)
m_transitionTime = currentTime + s_zoomOutTransitionDelay;
return m_transitionTime;
}
float ZoomManager::zoomInTransparency(double currentTime)
{
float t = zoomInTransitionTime(currentTime) - currentTime;
t *= s_invZoomInTransitionDelay;
return fmin(1, fmax(0, t));
}
float ZoomManager::zoomOutTransparency(double currentTime)
{
float t = zoomOutTransitionTime(currentTime) - currentTime;
t *= s_invZoomOutTransitionDelay;
return fmin(1, fmax(0, t));
}
bool ZoomManager::swapPages()
{
bool reset = m_scaleRequestState != kNoScaleRequest;
m_scaleRequestState = kNoScaleRequest;
return reset;
}
void ZoomManager::processNewScale(double currentTime, float scale)
{
m_prepareNextTiledPage = false;
m_zooming = false;
const SkIRect& viewportTileBounds = m_glWebViewState->viewportTileBounds();
if (scale == m_currentScale
|| m_glWebViewState->preZoomBounds().isEmpty())
m_glWebViewState->setPreZoomBounds(viewportTileBounds);
// If we have a different scale than the current one, we have to
// decide what to do. The current behaviour is to delay an update,
// so that we do not slow down zooming unnecessarily.
if ((m_currentScale != scale
&& (m_scaleRequestState == ZoomManager::kNoScaleRequest
|| m_futureScale != scale))
|| m_scaleRequestState == ZoomManager::kWillScheduleRequest) {
// schedule the new Zoom request
scheduleUpdate(currentTime, viewportTileBounds, scale);
// If it's a new request, we will have to prepare the page.
if (m_scaleRequestState == ZoomManager::kRequestNewScale)
m_prepareNextTiledPage = true;
}
// If the viewport has changed since we scheduled the request, we also need
// to prepare.
if ((m_scaleRequestState == ZoomManager::kRequestNewScale
|| m_scaleRequestState == ZoomManager::kReceivedNewScale)
&& m_glWebViewState->futureViewport() != viewportTileBounds)
m_prepareNextTiledPage = true;
// Checking if we are zooming...
if (m_scaleRequestState != ZoomManager::kNoScaleRequest) {
m_prepareNextTiledPage = true;
m_zooming = true;
}
// Get the current scale; if we are zooming, we don't change the scale
// factor immediately (see BaseLayerAndroid::drawBasePictureInGL()), but
// we change the scaleRequestState. When the state is kReceivedNewScale
// (see setReceivedRequest()), we can use the future scale instead of
// the current scale to request new textures. After a transition time,
// the scaleRequestState will be reset and the current scale will be set
// to the future scale.
m_layersScale = m_currentScale;
}
void ZoomManager::processTransition(double currentTime, float scale,
bool* doSwap, float* backPageTransparency,
float* frontPageTransparency)
{
if (scale < m_currentScale)
*backPageTransparency = 1 - zoomOutTransparency(currentTime);
else
*frontPageTransparency = zoomInTransparency(currentTime);
// The transition between the two page is finished
if (currentTime > transitionTime(currentTime, scale)) {
resetTransitionTime();
*doSwap = true;
}
}
} // namespace WebCore
#endif // USE(ACCELERATED_COMPOSITING)
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