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/*
* Copyright (C) 2012 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.
*/
#ifndef ANDROID_HWUI_CACHE_TEXTURE_H
#define ANDROID_HWUI_CACHE_TEXTURE_H
#include <GLES2/gl2.h>
#include <SkScalerContext.h>
#include <utils/Log.h>
#include "FontUtil.h"
namespace android {
namespace uirenderer {
/**
* CacheBlock is a node in a linked list of current free space areas in a CacheTexture.
* Using CacheBlocks enables us to pack the cache from top to bottom as well as left to right.
* When we add a glyph to the cache, we see if it fits within one of the existing columns that
* have already been started (this is the case if the glyph fits vertically as well as
* horizontally, and if its width is sufficiently close to the column width to avoid
* sub-optimal packing of small glyphs into wide columns). If there is no column in which the
* glyph fits, we check the final node, which is the remaining space in the cache, creating
* a new column as appropriate.
*
* As columns fill up, we remove their CacheBlock from the list to avoid having to check
* small blocks in the future.
*/
struct CacheBlock {
uint16_t mX;
uint16_t mY;
uint16_t mWidth;
uint16_t mHeight;
CacheBlock* mNext;
CacheBlock* mPrev;
CacheBlock(uint16_t x, uint16_t y, uint16_t width, uint16_t height, bool empty = false):
mX(x), mY(y), mWidth(width), mHeight(height), mNext(NULL), mPrev(NULL) {
}
static CacheBlock* insertBlock(CacheBlock* head, CacheBlock *newBlock);
static CacheBlock* removeBlock(CacheBlock* head, CacheBlock *blockToRemove);
void output() {
CacheBlock *currBlock = this;
while (currBlock) {
ALOGD("Block: this, x, y, w, h = %p, %d, %d, %d, %d",
currBlock, currBlock->mX, currBlock->mY, currBlock->mWidth, currBlock->mHeight);
currBlock = currBlock->mNext;
}
}
};
class CacheTexture {
public:
CacheTexture(uint16_t width, uint16_t height) :
mTexture(NULL), mTextureId(0), mWidth(width), mHeight(height),
mLinearFiltering(false), mDirty(false), mNumGlyphs(0) {
mCacheBlocks = new CacheBlock(TEXTURE_BORDER_SIZE, TEXTURE_BORDER_SIZE,
mWidth - TEXTURE_BORDER_SIZE, mHeight - TEXTURE_BORDER_SIZE, true);
}
~CacheTexture() {
if (mTexture) {
delete[] mTexture;
}
if (mTextureId) {
glDeleteTextures(1, &mTextureId);
}
reset();
}
void reset() {
// Delete existing cache blocks
while (mCacheBlocks != NULL) {
CacheBlock* tmpBlock = mCacheBlocks;
mCacheBlocks = mCacheBlocks->mNext;
delete tmpBlock;
}
mNumGlyphs = 0;
}
void init() {
// reset, then create a new remainder space to start again
reset();
mCacheBlocks = new CacheBlock(TEXTURE_BORDER_SIZE, TEXTURE_BORDER_SIZE,
mWidth - TEXTURE_BORDER_SIZE, mHeight - TEXTURE_BORDER_SIZE, true);
}
bool fitBitmap(const SkGlyph& glyph, uint32_t *retOriginX, uint32_t *retOriginY);
uint8_t* mTexture;
GLuint mTextureId;
uint16_t mWidth;
uint16_t mHeight;
bool mLinearFiltering;
bool mDirty;
uint16_t mNumGlyphs;
CacheBlock* mCacheBlocks;
};
}; // namespace uirenderer
}; // namespace android
#endif // ANDROID_HWUI_CACHE_TEXTURE_H
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