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/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "OffscreenBufferPool.h"
#include "Caches.h"
#include "Properties.h"
#include "renderstate/RenderState.h"
#include "utils/FatVector.h"
#include <utils/Log.h>
#include <GLES2/gl2.h>
namespace android {
namespace uirenderer {
////////////////////////////////////////////////////////////////////////////////
// OffscreenBuffer
////////////////////////////////////////////////////////////////////////////////
OffscreenBuffer::OffscreenBuffer(RenderState& renderState, Caches& caches,
uint32_t viewportWidth, uint32_t viewportHeight)
: GpuMemoryTracker(GpuObjectType::OffscreenBuffer)
, renderState(renderState)
, viewportWidth(viewportWidth)
, viewportHeight(viewportHeight)
, texture(caches) {
uint32_t width = computeIdealDimension(viewportWidth);
uint32_t height = computeIdealDimension(viewportHeight);
caches.textureState().activateTexture(0);
texture.resize(width, height, GL_RGBA);
texture.blend = true;
texture.setWrap(GL_CLAMP_TO_EDGE);
// not setting filter on texture, since it's set when drawing, based on transform
}
Rect OffscreenBuffer::getTextureCoordinates() {
const float texX = 1.0f / static_cast<float>(texture.width());
const float texY = 1.0f / static_cast<float>(texture.height());
return Rect(0, viewportHeight * texY, viewportWidth * texX, 0);
}
void OffscreenBuffer::dirty(Rect dirtyArea) {
dirtyArea.doIntersect(0, 0, viewportWidth, viewportHeight);
if (!dirtyArea.isEmpty()) {
region.orSelf(android::Rect(dirtyArea.left, dirtyArea.top,
dirtyArea.right, dirtyArea.bottom));
}
}
void OffscreenBuffer::updateMeshFromRegion() {
// avoid T-junctions as they cause artifacts in between the resultant
// geometry when complex transforms occur.
// TODO: generate the safeRegion only if necessary based on drawing transform
Region safeRegion = Region::createTJunctionFreeRegion(region);
size_t count;
const android::Rect* rects = safeRegion.getArray(&count);
const float texX = 1.0f / float(texture.width());
const float texY = 1.0f / float(texture.height());
FatVector<TextureVertex, 64> meshVector(count * 4); // uses heap if more than 64 vertices needed
TextureVertex* mesh = &meshVector[0];
for (size_t i = 0; i < count; i++) {
const android::Rect* r = &rects[i];
const float u1 = r->left * texX;
const float v1 = (viewportHeight - r->top) * texY;
const float u2 = r->right * texX;
const float v2 = (viewportHeight - r->bottom) * texY;
TextureVertex::set(mesh++, r->left, r->top, u1, v1);
TextureVertex::set(mesh++, r->right, r->top, u2, v1);
TextureVertex::set(mesh++, r->left, r->bottom, u1, v2);
TextureVertex::set(mesh++, r->right, r->bottom, u2, v2);
}
elementCount = count * 6;
renderState.meshState().genOrUpdateMeshBuffer(&vbo,
sizeof(TextureVertex) * count * 4,
&meshVector[0],
GL_DYNAMIC_DRAW); // TODO: GL_STATIC_DRAW if savelayer
}
uint32_t OffscreenBuffer::computeIdealDimension(uint32_t dimension) {
return uint32_t(ceilf(dimension / float(LAYER_SIZE)) * LAYER_SIZE);
}
OffscreenBuffer::~OffscreenBuffer() {
texture.deleteTexture();
renderState.meshState().deleteMeshBuffer(vbo);
elementCount = 0;
vbo = 0;
}
///////////////////////////////////////////////////////////////////////////////
// OffscreenBufferPool
///////////////////////////////////////////////////////////////////////////////
OffscreenBufferPool::OffscreenBufferPool()
: mMaxSize(Properties::layerPoolSize) {
}
OffscreenBufferPool::~OffscreenBufferPool() {
clear(); // TODO: unique_ptr?
}
int OffscreenBufferPool::Entry::compare(const Entry& lhs, const Entry& rhs) {
int deltaInt = int(lhs.width) - int(rhs.width);
if (deltaInt != 0) return deltaInt;
return int(lhs.height) - int(rhs.height);
}
void OffscreenBufferPool::clear() {
for (auto entry : mPool) {
delete entry.layer;
}
mPool.clear();
mSize = 0;
}
OffscreenBuffer* OffscreenBufferPool::get(RenderState& renderState,
const uint32_t width, const uint32_t height) {
OffscreenBuffer* layer = nullptr;
Entry entry(width, height);
auto iter = mPool.find(entry);
if (iter != mPool.end()) {
entry = *iter;
mPool.erase(iter);
layer = entry.layer;
layer->viewportWidth = width;
layer->viewportHeight = height;
mSize -= layer->getSizeInBytes();
} else {
layer = new OffscreenBuffer(renderState, Caches::getInstance(), width, height);
}
return layer;
}
OffscreenBuffer* OffscreenBufferPool::resize(OffscreenBuffer* layer,
const uint32_t width, const uint32_t height) {
RenderState& renderState = layer->renderState;
if (layer->texture.width() == OffscreenBuffer::computeIdealDimension(width)
&& layer->texture.height() == OffscreenBuffer::computeIdealDimension(height)) {
// resize in place
layer->viewportWidth = width;
layer->viewportHeight = height;
// entire area will be repainted (and may be smaller) so clear usage region
layer->region.clear();
return layer;
}
putOrDelete(layer);
return get(renderState, width, height);
}
void OffscreenBufferPool::dump() {
for (auto entry : mPool) {
ALOGD(" Layer size %dx%d", entry.width, entry.height);
}
}
void OffscreenBufferPool::putOrDelete(OffscreenBuffer* layer) {
const uint32_t size = layer->getSizeInBytes();
// Don't even try to cache a layer that's bigger than the cache
if (size < mMaxSize) {
// TODO: Use an LRU
while (mSize + size > mMaxSize) {
OffscreenBuffer* victim = mPool.begin()->layer;
mSize -= victim->getSizeInBytes();
delete victim;
mPool.erase(mPool.begin());
}
// clear region, since it's no longer valid
layer->region.clear();
Entry entry(layer);
mPool.insert(entry);
mSize += size;
} else {
delete layer;
}
}
}; // namespace uirenderer
}; // namespace android