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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()
{
}
LLFontBitmapCache::~LLFontBitmapCache()
{
}
void LLFontBitmapCache::init(S32 max_char_width,
S32 max_char_height)
{
reset();
mMaxCharWidth = max_char_width;
mMaxCharHeight = max_char_height;
S32 image_width = mMaxCharWidth * 20;
S32 pow_iw = 2;
while (pow_iw < image_width)
{
pow_iw <<= 1;
}
image_width = pow_iw;
image_width = llmin(512, image_width); // Don't make bigger than 512x512, ever.
mBitmapWidth = image_width;
mBitmapHeight = image_width;
}
LLImageRaw *LLFontBitmapCache::getImageRaw(EFontGlyphType bitmap_type, U32 bitmap_num) const
{
const U32 bitmap_idx = static_cast<U32>(bitmap_type);
if (bitmap_type >= EFontGlyphType::Count || bitmap_num >= mImageRawVec[bitmap_idx].size())
return nullptr;
return mImageRawVec[bitmap_idx][bitmap_num];
}
LLImageGL *LLFontBitmapCache::getImageGL(EFontGlyphType bitmap_type, U32 bitmap_num) const
{
const U32 bitmap_idx = static_cast<U32>(bitmap_type);
if (bitmap_type >= EFontGlyphType::Count || bitmap_num >= mImageGLVec[bitmap_idx].size())
return nullptr;
return mImageGLVec[bitmap_idx][bitmap_num];
}
bool LLFontBitmapCache::nextOpenPos(S32 width, S32& pos_x, S32& pos_y, EFontGlyphType bitmap_type, U32& bitmap_num)
{
if (bitmap_type >= EFontGlyphType::Count)
{
return false;
}
const U32 bitmap_idx = static_cast<U32>(bitmap_type);
if (mImageRawVec[bitmap_idx].empty() || (mCurrentOffsetX[bitmap_idx] + width + 1) > mBitmapWidth)
{
if ((mImageRawVec[bitmap_idx].empty()) || (mCurrentOffsetY[bitmap_idx] + 2*mMaxCharHeight + 2) > mBitmapHeight)
{
// We're out of space in the current image, or no image
// has been allocated yet. Make a new one.
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;
mBitmapWidth = image_width;
mBitmapHeight = image_height;
S32 num_components = getNumComponents(bitmap_type);
mImageRawVec[bitmap_idx].push_back(new LLImageRaw(mBitmapWidth, mBitmapHeight, num_components));
bitmap_num = static_cast<U32>(mImageRawVec[bitmap_idx].size()) - 1;
LLImageRaw* image_raw = getImageRaw(bitmap_type, bitmap_num);
if (EFontGlyphType::Grayscale == bitmap_type)
{
image_raw->clear(255, 0);
}
// Make corresponding GL image.
mImageGLVec[bitmap_idx].push_back(new LLImageGL(image_raw, false, false));
LLImageGL* image_gl = getImageGL(bitmap_type, bitmap_num);
// Start at beginning of the new image.
mCurrentOffsetX[bitmap_idx] = 1;
mCurrentOffsetY[bitmap_idx] = 1;
// Attach corresponding GL texture. (*TODO: is this needed?)
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[bitmap_idx] = 1;
mCurrentOffsetY[bitmap_idx] += mMaxCharHeight + 1;
}
}
pos_x = mCurrentOffsetX[bitmap_idx];
pos_y = mCurrentOffsetY[bitmap_idx];
bitmap_num = getNumBitmaps(bitmap_type) - 1;
mCurrentOffsetX[bitmap_idx] += width + 1;
return true;
}
void LLFontBitmapCache::destroyGL()
{
for (U32 idx = 0, cnt = static_cast<U32>(EFontGlyphType::Count); idx < cnt; idx++)
{
for (LLImageGL* image_gl : mImageGLVec[idx])
{
image_gl->destroyGLTexture();
}
}
}
void LLFontBitmapCache::reset()
{
for (U32 idx = 0, cnt = static_cast<U32>(EFontGlyphType::Count); idx < cnt; idx++)
{
mImageRawVec[idx].clear();
mImageGLVec[idx].clear();
mCurrentOffsetX[idx] = 1;
mCurrentOffsetY[idx] = 1;
}
mBitmapWidth = 0;
mBitmapHeight = 0;
}
//static
U32 LLFontBitmapCache::getNumComponents(EFontGlyphType bitmap_type)
{
switch (bitmap_type)
{
case EFontGlyphType::Grayscale:
return 2;
case EFontGlyphType::Color:
return 4;
default:
llassert(false);
return 2;
}
}
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