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/*
* Copyright 2010, 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.
*/
#include "config.h"
#include "TilesManager.h"
#if USE(ACCELERATED_COMPOSITING)
#include "BaseTile.h"
#include "SkCanvas.h"
#include "SkPaint.h"
#include <cutils/atomic.h>
#ifdef DEBUG
#include <cutils/log.h>
#include <wtf/CurrentTime.h>
#include <wtf/text/CString.h>
#undef XLOG
#define XLOG(...) android_printLog(ANDROID_LOG_DEBUG, "TilesManager", __VA_ARGS__)
#else
#undef XLOG
#define XLOG(...)
#endif // DEBUG
// Important: We need at least twice as much textures as is needed to cover
// one viewport, otherwise the allocation may stall.
// We need n textures for one TiledPage, and another n textures for the
// second page used when scaling.
// In our case, we use 300x300 textures. On the tablet, this equals to
// at least 24 (6 * 4) textures, hence 48.
#define DEFAULT_TEXTURES_ALLOCATION 48
#define DEFAULT_TEXTURE_SIZE_WIDTH 300
#define DEFAULT_TEXTURE_SIZE_HEIGHT 300
namespace WebCore {
TilesManager::TilesManager()
: m_generatorReady(false)
{
m_textures.reserveCapacity(DEFAULT_TEXTURES_ALLOCATION);
for (int i = 0; i < DEFAULT_TEXTURES_ALLOCATION; i++) {
BackedDoubleBufferedTexture* texture = new BackedDoubleBufferedTexture(
tileWidth(), tileHeight());
// the atomic load ensures that the texture has been fully initialized
// before we pass a pointer for other threads to operate on
m_textures.append(
(BackedDoubleBufferedTexture*)android_atomic_acquire_load((int32_t*)&texture));
}
m_pixmapsGenerationThread = new TexturesGenerator();
m_pixmapsGenerationThread->run("TexturesGenerator");
}
// Has to be run on the texture generation threads
void TilesManager::enableTextures()
{
android::Mutex::Autolock lock(m_texturesLock);
for (unsigned int i = 0; i < m_textures.size(); i++) {
BackedDoubleBufferedTexture* texture = m_textures[i];
texture->producerAcquireContext();
}
}
void TilesManager::printTextures()
{
#ifdef DEBUG
XLOG("++++++");
for (unsigned int i = 0; i < m_textures.size(); i++) {
BackedDoubleBufferedTexture* texture = m_textures[i];
BaseTile* o = 0;
if (texture->owner())
o = (BaseTile*) texture->owner();
int x = -1;
int y = -1;
if (o) {
x = o->x();
y = o->y();
}
XLOG("[%d] texture %x usedLevel: %d busy: %d owner: %x (%d, %d) page: %x scale: %.2f",
i, texture, texture->usedLevel(),
texture->busy(), o, x, y, o ? o->page() : 0, o ? o->scale() : 0);
}
XLOG("------");
#endif // DEBUG
}
void TilesManager::paintTexturesDefault()
{
android::Mutex::Autolock lock(m_texturesLock);
for (unsigned int i = 0; i < m_textures.size(); i++) {
for (int j = 0; j < 2; j++) {
BackedDoubleBufferedTexture* texture = m_textures[i];
TextureInfo* textureInfo = texture->producerLock();
SkCanvas* canvas = texture->canvas();
#ifdef DEBUG
if (j)
canvas->drawARGB(255, 0, 0, 255);
else
canvas->drawARGB(255, 255, 0, 255);
SkPaint paint;
paint.setARGB(128, 255, 0, 0);
paint.setStrokeWidth(3);
canvas->drawLine(0, 0, tileWidth(), tileHeight(), paint);
paint.setARGB(128, 0, 255, 0);
canvas->drawLine(0, tileHeight(), tileWidth(), 0, paint);
paint.setARGB(128, 0, 0, 255);
canvas->drawLine(0, 0, tileWidth(), 0, paint);
canvas->drawLine(tileWidth(), 0, tileWidth(), tileHeight(), paint);
#else
canvas->drawARGB(255, 255, 255, 255);
#endif // DEBUG
texture->producerUpdate(textureInfo);
}
}
}
void TilesManager::resetTextureUsage(TiledPage* page)
{
android::Mutex::Autolock lock(m_texturesLock);
for (unsigned int i = 0; i < m_textures.size(); i++) {
BackedDoubleBufferedTexture* texture = m_textures[i];
if (texture->owner()) {
if (texture->owner()->page() == page)
texture->setUsedLevel(-1);
}
}
}
BackedDoubleBufferedTexture* TilesManager::getAvailableTexture(BaseTile* owner)
{
android::Mutex::Autolock lock(m_texturesLock);
// Sanity check that the tile does not already own a texture
if (owner->texture() && owner->texture()->owner() == owner) {
owner->texture()->setUsedLevel(0);
XLOG("same owner, getAvailableTexture(%x) => texture %x", owner, owner->texture());
return owner->texture();
}
// The heuristic for selecting a texture is as follows:
// 1. return an unused texture if one exists
// 2. return the farthest texture from the viewport (from any tiled page)
// 3. return any texture not used by the tile's page or the page's sibiling
//
// The texture level indicates a tiles closeness to the current viewport
BackedDoubleBufferedTexture* farthestTexture = 0;
int farthestTextureLevel = 0;
const unsigned int max = m_textures.size();
for (unsigned int i = 0; i < max; i++) {
BackedDoubleBufferedTexture* texture = m_textures[i];
if (texture->usedLevel() == -1) { // found an unused texture, grab it
farthestTexture = texture;
break;
}
if (farthestTextureLevel < texture->usedLevel()) {
farthestTextureLevel = texture->usedLevel();
farthestTexture = texture;
}
}
if (farthestTexture && farthestTexture->acquire(owner)) {
XLOG("farthest texture, getAvailableTexture(%x) => texture %x (level %d)",
owner, farthestTexture, farthestTexture->usedLevel());
farthestTexture->setUsedLevel(0);
return farthestTexture;
}
// At this point, all textures are used or we failed to aquire the farthest
// texture. Now let's just grab a texture not in use by either of the two
// tiled pages associated with this view.
TiledPage* currentPage = owner->page();
TiledPage* nextPage = currentPage->sibling();
for (unsigned int i = 0; i < max; i++) {
BackedDoubleBufferedTexture* texture = m_textures[i];
if (texture->owner()
&& texture->owner()->page() != currentPage
&& texture->owner()->page() != nextPage
&& texture->acquire(owner)) {
XLOG("grab a texture that wasn't ours, (%x != %x) at %d => texture %x",
owner->page(), texture->owner()->page(), i, texture);
texture->setUsedLevel(0);
return texture;
}
}
XLOG("Couldn't find an available texture for BaseTile %x (%d, %d) !!!",
owner, owner->x(), owner->y());
#ifdef DEBUG
printTextures();
#endif // DEBUG
return 0;
}
float TilesManager::tileWidth() const
{
return DEFAULT_TEXTURE_SIZE_WIDTH;
}
float TilesManager::tileHeight() const
{
return DEFAULT_TEXTURE_SIZE_HEIGHT;
}
TilesManager* TilesManager::instance()
{
if (!gInstance) {
gInstance = new TilesManager();
XLOG("Waiting for the generator...");
gInstance->waitForGenerator();
XLOG("Generator ready!");
}
return gInstance;
}
TilesManager* TilesManager::gInstance = 0;
} // namespace WebCore
#endif // USE(ACCELERATED_COMPOSITING)
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