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/*
* Copyright (C) 2010 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.
*/
#define LOG_TAG "OpenGLRenderer"
#include <GLES2/gl2.h>
#include <SkCanvas.h>
#include <SkRect.h>
#include "PathCache.h"
namespace android {
namespace uirenderer {
///////////////////////////////////////////////////////////////////////////////
// Constructors/destructor
///////////////////////////////////////////////////////////////////////////////
PathCache::PathCache(uint32_t maxByteSize):
mCache(GenerationCache<PathCacheEntry, PathTexture*>::kUnlimitedCapacity),
mSize(0), mMaxSize(maxByteSize) {
mCache.setOnEntryRemovedListener(this);
GLint maxTextureSize;
glGetIntegerv(GL_MAX_TEXTURE_SIZE, &maxTextureSize);
mMaxTextureSize = maxTextureSize;
}
PathCache::~PathCache() {
mCache.clear();
}
///////////////////////////////////////////////////////////////////////////////
// Size management
///////////////////////////////////////////////////////////////////////////////
uint32_t PathCache::getSize() {
return mSize;
}
uint32_t PathCache::getMaxSize() {
return mMaxSize;
}
void PathCache::setMaxSize(uint32_t maxSize) {
mMaxSize = maxSize;
while (mSize > mMaxSize) {
mCache.removeOldest();
}
}
///////////////////////////////////////////////////////////////////////////////
// Callbacks
///////////////////////////////////////////////////////////////////////////////
void PathCache::operator()(PathCacheEntry& path, PathTexture*& texture) {
const uint32_t size = texture->width * texture->height;
mSize -= size;
if (texture) {
glDeleteTextures(1, &texture->id);
delete texture;
}
}
///////////////////////////////////////////////////////////////////////////////
// Caching
///////////////////////////////////////////////////////////////////////////////
PathTexture* PathCache::get(SkPath* path, SkPaint* paint) {
PathCacheEntry entry(path, paint);
PathTexture* texture = mCache.get(entry);
if (!texture) {
texture = addTexture(entry, path, paint);
} else if (path->getGenerationID() != texture->generation) {
mCache.remove(entry);
texture = addTexture(entry, path, paint);
}
return texture;
}
PathTexture* PathCache::addTexture(const PathCacheEntry& entry,
const SkPath *path, const SkPaint* paint) {
const SkRect& bounds = path->getBounds();
const float pathWidth = bounds.width();
const float pathHeight = bounds.height();
if (pathWidth > mMaxTextureSize || pathHeight > mMaxTextureSize) {
LOGW("Path too large to be rendered into a texture");
return NULL;
}
const float offset = entry.strokeWidth * 1.5f;
const uint32_t width = uint32_t(pathWidth + offset * 2.0 + 0.5);
const uint32_t height = uint32_t(pathHeight + offset * 2.0 + 0.5);
const uint32_t size = width * height;
// Don't even try to cache a bitmap that's bigger than the cache
if (size < mMaxSize) {
while (mSize + size > mMaxSize) {
mCache.removeOldest();
}
}
PathTexture* texture = new PathTexture;
texture->left = bounds.fLeft;
texture->top = bounds.fTop;
texture->offset = offset;
texture->width = width;
texture->height = height;
texture->generation = path->getGenerationID();
SkBitmap bitmap;
bitmap.setConfig(SkBitmap::kA8_Config, width, height);
bitmap.allocPixels();
bitmap.eraseColor(0);
SkCanvas canvas(bitmap);
canvas.translate(-bounds.fLeft + offset, -bounds.fTop + offset);
canvas.drawPath(*path, *paint);
generateTexture(bitmap, texture);
if (size < mMaxSize) {
mSize += size;
mCache.put(entry, texture);
} else {
texture->cleanup = true;
}
return texture;
}
void PathCache::clear() {
mCache.clear();
}
void PathCache::generateTexture(SkBitmap& bitmap, Texture* texture) {
SkAutoLockPixels alp(bitmap);
if (!bitmap.readyToDraw()) {
LOGE("Cannot generate texture from bitmap");
return;
}
glGenTextures(1, &texture->id);
glBindTexture(GL_TEXTURE_2D, texture->id);
// Textures are Alpha8
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
texture->blend = true;
glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, bitmap.rowBytesAsPixels(), texture->height, 0,
GL_ALPHA, GL_UNSIGNED_BYTE, bitmap.getPixels());
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
}
}; // namespace uirenderer
}; // namespace android
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