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/**
* @file llfontbitmapcache.cpp
* @brief Storage for previously rendered glyphs.
*
* $LicenseInfo:firstyear=2008&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, Linden Research, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#include "linden_common.h"
#include "llgl.h"
#include "llfontbitmapcache.h"
LLFontBitmapCache::LLFontBitmapCache()
: mNumComponents(0),
mBitmapWidth(0),
mBitmapHeight(0),
mBitmapNum(-1),
mMaxCharWidth(0),
mMaxCharHeight(0),
mCurrentOffsetX(1),
mCurrentOffsetY(1)
{
}
LLFontBitmapCache::~LLFontBitmapCache()
{
}
void LLFontBitmapCache::init(S32 num_components,
S32 max_char_width,
S32 max_char_height)
{
reset();
mNumComponents = num_components;
mMaxCharWidth = max_char_width;
mMaxCharHeight = max_char_height;
}
LLImageRaw *LLFontBitmapCache::getImageRaw(U32 bitmap_num) const
{
if (bitmap_num >= mImageRawVec.size())
return NULL;
return mImageRawVec[bitmap_num];
}
LLImageGL *LLFontBitmapCache::getImageGL(U32 bitmap_num) const
{
if (bitmap_num >= mImageGLVec.size())
return NULL;
return mImageGLVec[bitmap_num];
}
bool LLFontBitmapCache::nextOpenPos(S32 width, S32 &pos_x, S32 &pos_y, S32& bitmap_num)
{
if ((mBitmapNum<0) || (mCurrentOffsetX + width + 1) > mBitmapWidth)
{
if ((mBitmapNum<0) || (mCurrentOffsetY + 2*mMaxCharHeight + 2) > mBitmapHeight)
{
// We're out of space in the current image, or no image
// has been allocated yet. Make a new one.
mImageRawVec.push_back(new LLImageRaw);
mBitmapNum = mImageRawVec.size()-1;
LLImageRaw *image_raw = getImageRaw(mBitmapNum);
// Make corresponding GL image.
mImageGLVec.push_back(new LLImageGL(FALSE));
LLImageGL *image_gl = getImageGL(mBitmapNum);
S32 image_width = mMaxCharWidth * 20;
S32 pow_iw = 2;
while (pow_iw < image_width)
{
pow_iw *= 2;
}
image_width = pow_iw;
image_width = llmin(512, image_width); // Don't make bigger than 512x512, ever.
S32 image_height = image_width;
image_raw->resize(image_width, image_height, mNumComponents);
mBitmapWidth = image_width;
mBitmapHeight = image_height;
switch (mNumComponents)
{
case 1:
image_raw->clear();
break;
case 2:
image_raw->clear(255, 0);
break;
}
// Start at beginning of the new image.
mCurrentOffsetX = 1;
mCurrentOffsetY = 1;
// Attach corresponding GL texture.
image_gl->createGLTexture(0, image_raw);
gGL.getTexUnit(0)->bind(image_gl);
image_gl->setFilteringOption(LLTexUnit::TFO_POINT); // was setMipFilterNearest(TRUE, TRUE);
}
else
{
// Move to next row in current image.
mCurrentOffsetX = 1;
mCurrentOffsetY += mMaxCharHeight + 1;
}
}
pos_x = mCurrentOffsetX;
pos_y = mCurrentOffsetY;
bitmap_num = mBitmapNum;
mCurrentOffsetX += width + 1;
return true;
}
void LLFontBitmapCache::destroyGL()
{
for (std::vector<LLPointer<LLImageGL> >::iterator it = mImageGLVec.begin();
it != mImageGLVec.end(); ++it)
{
(*it)->destroyGLTexture();
}
}
void LLFontBitmapCache::reset()
{
mImageRawVec.clear();
mImageGLVec.clear();
mBitmapWidth = 0;
mBitmapHeight = 0;
mBitmapNum = -1;
mCurrentOffsetX = 1;
mCurrentOffsetY = 1;
}
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