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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.
*/
#include <utils/Log.h>
#include "Debug.h"
#include "CacheTexture.h"
namespace android {
namespace uirenderer {
///////////////////////////////////////////////////////////////////////////////
// CacheBlock
///////////////////////////////////////////////////////////////////////////////
/**
* Insert new block into existing linked list of blocks. Blocks are sorted in increasing-width
* order, except for the final block (the remainder space at the right, since we fill from the
* left).
*/
CacheBlock* CacheBlock::insertBlock(CacheBlock* head, CacheBlock *newBlock) {
#if DEBUG_FONT_RENDERER
ALOGD("insertBlock: this, x, y, w, h = %p, %d, %d, %d, %d",
newBlock, newBlock->mX, newBlock->mY,
newBlock->mWidth, newBlock->mHeight);
#endif
CacheBlock *currBlock = head;
CacheBlock *prevBlock = NULL;
while (currBlock && currBlock->mY != TEXTURE_BORDER_SIZE) {
if (newBlock->mWidth < currBlock->mWidth) {
newBlock->mNext = currBlock;
newBlock->mPrev = prevBlock;
currBlock->mPrev = newBlock;
if (prevBlock) {
prevBlock->mNext = newBlock;
return head;
} else {
return newBlock;
}
}
prevBlock = currBlock;
currBlock = currBlock->mNext;
}
// new block larger than all others - insert at end (but before the remainder space, if there)
newBlock->mNext = currBlock;
newBlock->mPrev = prevBlock;
if (currBlock) {
currBlock->mPrev = newBlock;
}
if (prevBlock) {
prevBlock->mNext = newBlock;
return head;
} else {
return newBlock;
}
}
CacheBlock* CacheBlock::removeBlock(CacheBlock* head, CacheBlock *blockToRemove) {
#if DEBUG_FONT_RENDERER
ALOGD("removeBlock: this, x, y, w, h = %p, %d, %d, %d, %d",
blockToRemove, blockToRemove->mX, blockToRemove->mY,
blockToRemove->mWidth, blockToRemove->mHeight);
#endif
CacheBlock* newHead = head;
CacheBlock* nextBlock = blockToRemove->mNext;
CacheBlock* prevBlock = blockToRemove->mPrev;
if (prevBlock) {
prevBlock->mNext = nextBlock;
} else {
newHead = nextBlock;
}
if (nextBlock) {
nextBlock->mPrev = prevBlock;
}
delete blockToRemove;
return newHead;
}
///////////////////////////////////////////////////////////////////////////////
// CacheTexture
///////////////////////////////////////////////////////////////////////////////
bool CacheTexture::fitBitmap(const SkGlyph& glyph, uint32_t *retOriginX, uint32_t *retOriginY) {
if (glyph.fHeight + TEXTURE_BORDER_SIZE > mHeight) {
return false;
}
uint16_t glyphW = glyph.fWidth + TEXTURE_BORDER_SIZE;
uint16_t glyphH = glyph.fHeight + TEXTURE_BORDER_SIZE;
// roundedUpW equals glyphW to the next multiple of CACHE_BLOCK_ROUNDING_SIZE.
// This columns for glyphs that are close but not necessarily exactly the same size. It trades
// off the loss of a few pixels for some glyphs against the ability to store more glyphs
// of varying sizes in one block.
uint16_t roundedUpW =
(glyphW + CACHE_BLOCK_ROUNDING_SIZE - 1) & -CACHE_BLOCK_ROUNDING_SIZE;
CacheBlock *cacheBlock = mCacheBlocks;
while (cacheBlock) {
// Store glyph in this block iff: it fits the block's remaining space and:
// it's the remainder space (mY == 0) or there's only enough height for this one glyph
// or it's within ROUNDING_SIZE of the block width
if (roundedUpW <= cacheBlock->mWidth && glyphH <= cacheBlock->mHeight &&
(cacheBlock->mY == TEXTURE_BORDER_SIZE ||
(cacheBlock->mWidth - roundedUpW < CACHE_BLOCK_ROUNDING_SIZE))) {
if (cacheBlock->mHeight - glyphH < glyphH) {
// Only enough space for this glyph - don't bother rounding up the width
roundedUpW = glyphW;
}
*retOriginX = cacheBlock->mX;
*retOriginY = cacheBlock->mY;
// If this is the remainder space, create a new cache block for this column. Otherwise,
// adjust the info about this column.
if (cacheBlock->mY == TEXTURE_BORDER_SIZE) {
uint16_t oldX = cacheBlock->mX;
// Adjust remainder space dimensions
cacheBlock->mWidth -= roundedUpW;
cacheBlock->mX += roundedUpW;
if (mHeight - glyphH >= glyphH) {
// There's enough height left over to create a new CacheBlock
CacheBlock *newBlock = new CacheBlock(oldX, glyphH + TEXTURE_BORDER_SIZE,
roundedUpW, mHeight - glyphH - TEXTURE_BORDER_SIZE);
#if DEBUG_FONT_RENDERER
ALOGD("fitBitmap: Created new block: this, x, y, w, h = %p, %d, %d, %d, %d",
newBlock, newBlock->mX, newBlock->mY,
newBlock->mWidth, newBlock->mHeight);
#endif
mCacheBlocks = CacheBlock::insertBlock(mCacheBlocks, newBlock);
}
} else {
// Insert into current column and adjust column dimensions
cacheBlock->mY += glyphH;
cacheBlock->mHeight -= glyphH;
#if DEBUG_FONT_RENDERER
ALOGD("fitBitmap: Added to existing block: this, x, y, w, h = %p, %d, %d, %d, %d",
cacheBlock, cacheBlock->mX, cacheBlock->mY,
cacheBlock->mWidth, cacheBlock->mHeight);
#endif
}
if (cacheBlock->mHeight < fmin(glyphH, glyphW)) {
// If remaining space in this block is too small to be useful, remove it
mCacheBlocks = CacheBlock::removeBlock(mCacheBlocks, cacheBlock);
}
mDirty = true;
mNumGlyphs++;
#if DEBUG_FONT_RENDERER
ALOGD("fitBitmap: current block list:");
mCacheBlocks->output();
#endif
return true;
}
cacheBlock = cacheBlock->mNext;
}
#if DEBUG_FONT_RENDERER
ALOGD("fitBitmap: returning false for glyph of size %d, %d", glyphW, glyphH);
#endif
return false;
}
}; // namespace uirenderer
}; // namespace android
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