LLFontGlyphInfo* LLFontFreetype::addGlyphFromFont(const LLFontFreetype *fontp, llwchar wch, U32 glyph_index) const
{
if (mFTFace == NULL)
return NULL;
//llassert(!mIsFallback);
fontp->renderGlyph(glyph_index);
S32 width = fontp->mFTFace->glyph->bitmap.width;
S32 height = fontp->mFTFace->glyph->bitmap.rows;
S32 pos_x, pos_y;
S32 bitmap_num;
mFontBitmapCachep->nextOpenPos(width, pos_x, pos_y, bitmap_num);
mAddGlyphCount++;
LLFontGlyphInfo* gi = new LLFontGlyphInfo(glyph_index);
gi->mXBitmapOffset = pos_x;
gi->mYBitmapOffset = pos_y;
gi->mBitmapNum = bitmap_num;
gi->mWidth = width;
gi->mHeight = height;
gi->mXBearing = fontp->mFTFace->glyph->bitmap_left;
gi->mYBearing = fontp->mFTFace->glyph->bitmap_top;
// Convert these from 26.6 units to float pixels.
gi->mXAdvance = fontp->mFTFace->glyph->advance.x / 64.f;
gi->mYAdvance = fontp->mFTFace->glyph->advance.y / 64.f;
insertGlyphInfo(wch, gi);
llassert(fontp->mFTFace->glyph->bitmap.pixel_mode == FT_PIXEL_MODE_MONO
|| fontp->mFTFace->glyph->bitmap.pixel_mode == FT_PIXEL_MODE_GRAY);
if (fontp->mFTFace->glyph->bitmap.pixel_mode == FT_PIXEL_MODE_MONO
|| fontp->mFTFace->glyph->bitmap.pixel_mode == FT_PIXEL_MODE_GRAY)
{
U8 *buffer_data = fontp->mFTFace->glyph->bitmap.buffer;
S32 buffer_row_stride = fontp->mFTFace->glyph->bitmap.pitch;
U8 *tmp_graydata = NULL;
if (fontp->mFTFace->glyph->bitmap.pixel_mode
== FT_PIXEL_MODE_MONO)
{
// need to expand 1-bit bitmap to 8-bit graymap.
tmp_graydata = new U8[width * height];
S32 xpos, ypos;
for (ypos = 0; ypos < height; ++ypos)
{
S32 bm_row_offset = buffer_row_stride * ypos;
for (xpos = 0; xpos < width; ++xpos)
{
U32 bm_col_offsetbyte = xpos / 8;
U32 bm_col_offsetbit = 7 - (xpos % 8);
U32 bit =
!!(buffer_data[bm_row_offset
+ bm_col_offsetbyte
] & (1 << bm_col_offsetbit) );
tmp_graydata[width*ypos + xpos] =
255 * bit;
}
}
// use newly-built graymap.
buffer_data = tmp_graydata;
buffer_row_stride = width;
}
switch (mFontBitmapCachep->getNumComponents())
{
case 1:
mFontBitmapCachep->getImageRaw(bitmap_num)->setSubImage(pos_x,
pos_y,
width,
height,
buffer_data,
buffer_row_stride,
TRUE);
break;
case 2:
setSubImageLuminanceAlpha(pos_x,
pos_y,
bitmap_num,
width,
height,
buffer_data,
buffer_row_stride);
break;
default:
break;
}
if (tmp_graydata)
delete[] tmp_graydata;
} else {
// we don't know how to handle this pixel format from FreeType;
// omit it from the font-image.
}
LLImageGL *image_gl = mFontBitmapCachep->getImageGL(bitmap_num);
LLImageRaw *image_raw = mFontBitmapCachep->getImageRaw(bitmap_num);
image_gl->setSubImage(image_raw, 0, 0, image_gl->getWidth(), image_gl->getHeight());
return gi;
}
F32 LLFont::getXAdvance(const llwchar wch) const
{
if (mFTFace == NULL)
return 0.0;
llassert(!mIsFallback);
U32 glyph_index;
// Return existing info only if it is current
LLFontGlyphInfo* gi = getGlyphInfo(wch);
if (gi && gi->mMetricsValid)
{
return gi->mXAdvance;
}
const LLFont* fontp = this;
// Initialize char to glyph map
glyph_index = FT_Get_Char_Index(mFTFace, wch);
if (glyph_index == 0 && mFallbackFontp)
{
LLFontList::iterator iter;
for(iter = mFallbackFontp->begin(); (iter != mFallbackFontp->end()) && (glyph_index == 0); iter++)
{
glyph_index = FT_Get_Char_Index((*iter)->mFTFace, wch);
if(glyph_index)
{
fontp = *iter;
}
}
}
if (glyph_index)
{
// This font has this glyph
fontp->renderGlyph(glyph_index);
// Create the entry if it's not there
char_glyph_info_map_t::iterator iter2 = mCharGlyphInfoMap.find(wch);
if (iter2 == mCharGlyphInfoMap.end())
{
gi = new LLFontGlyphInfo(glyph_index);
insertGlyphInfo(wch, gi);
}
else
{
gi = iter2->second;
}
gi->mWidth = fontp->mFTFace->glyph->bitmap.width;
gi->mHeight = fontp->mFTFace->glyph->bitmap.rows;
// Convert these from 26.6 units to float pixels.
gi->mXAdvance = fontp->mFTFace->glyph->advance.x / 64.f;
gi->mYAdvance = fontp->mFTFace->glyph->advance.y / 64.f;
gi->mMetricsValid = TRUE;
return gi->mXAdvance;
}
else
{
gi = get_if_there(mCharGlyphInfoMap, (llwchar)0, (LLFontGlyphInfo*)NULL);
if (gi)
{
return gi->mXAdvance;
}
}
// Last ditch fallback - no glyphs defined at all.
return (F32)mFontBitmapCachep->getMaxCharWidth();
}
