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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.
*/
#ifndef ZoomManager_h
#define ZoomManager_h
#if USE(ACCELERATED_COMPOSITING)
#include "SkRect.h"
namespace WebCore {
class GLWebViewState;
class ZoomManager {
public:
enum GLScaleStates {
kNoScaleRequest = 0,
kWillScheduleRequest = 1,
kRequestNewScale = 2,
kReceivedNewScale = 3
};
typedef int32_t GLScaleState;
ZoomManager(GLWebViewState* state);
void scheduleUpdate(const double& currentTime, const SkIRect& viewport, float scale);
GLScaleState scaleRequestState() const { return m_scaleRequestState; }
void setScaleRequestState(GLScaleState state) { m_scaleRequestState = state; }
float currentScale() const { return m_currentScale; }
void setCurrentScale(float scale) { m_currentScale = scale; }
float futureScale() const { return m_futureScale; }
void setFutureScale(float scale) { m_futureScale = scale; }
float layersScale() const { return m_layersScale; }
double zoomInTransitionTime(double currentTime);
double zoomOutTransitionTime(double currentTime);
float zoomInTransparency(double currentTime);
float zoomOutTransparency(double currentTime);
void resetTransitionTime() { m_transitionTime = -1; }
double updateTime() const { return m_updateTime; }
void setUpdateTime(double value) { m_updateTime = value; }
// state used by BaseLayerAndroid
bool needPrepareNextTiledPage() { return m_prepareNextTiledPage; }
bool zooming() { return m_zooming; }
bool didFireRequest() { return m_scaleRequestState == ZoomManager::kRequestNewScale; }
void setReceivedRequest() {
m_scaleRequestState = ZoomManager::kReceivedNewScale;
m_layersScale = m_futureScale;
}
bool didReceivedRequest() { return m_scaleRequestState == ZoomManager::kReceivedNewScale; }
double transitionTime(double currentTime, float scale) {
return (scale < m_currentScale) ? zoomOutTransitionTime(currentTime)
: zoomInTransitionTime(currentTime);
}
void processTransition(double currentTime, float scale, bool* doSwap,
float* backPageTransparency, float* frontPageTransparency);
bool swapPages();
void processNewScale(double currentTime, float scale);
private:
// Delay between scheduling a new page when the scale
// factor changes (i.e. zooming in or out)
static const double s_updateInitialDelay = 0.3; // 300 ms
// If the scale factor continued to change and we completed
// the original delay, we push back the update by this value
static const double s_updateDelay = 0.1; // 100 ms
// Delay for the transition between the two pages
static const double s_zoomInTransitionDelay = 0.1; // 100 ms
static const double s_invZoomInTransitionDelay = 10;
static const double s_zoomOutTransitionDelay = 0.2; // 200 ms
static const double s_invZoomOutTransitionDelay = 5;
GLScaleState m_scaleRequestState;
float m_currentScale;
float m_futureScale;
float m_layersScale;
double m_updateTime;
double m_transitionTime;
bool m_prepareNextTiledPage;
bool m_zooming;
GLWebViewState* m_glWebViewState;
};
} // namespace WebCore
#endif // USE(ACCELERATED_COMPOSITING)
#endif // ZoomManager_h
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