diff options
Diffstat (limited to 'src/gui/painting/qtextureglyphcache.cpp')
| -rw-r--r-- | src/gui/painting/qtextureglyphcache.cpp | 26 |
1 files changed, 18 insertions, 8 deletions
diff --git a/src/gui/painting/qtextureglyphcache.cpp b/src/gui/painting/qtextureglyphcache.cpp index 7f32d19..cf3957b 100644 --- a/src/gui/painting/qtextureglyphcache.cpp +++ b/src/gui/painting/qtextureglyphcache.cpp @@ -55,6 +55,20 @@ QT_BEGIN_NAMESPACE // #define CACHE_DEBUG +// returns the highest number closest to v, which is a power of 2 +// NB! assumes 32 bit ints +int qt_next_power_of_two(int v) +{ + v--; + v |= v >> 1; + v |= v >> 2; + v |= v >> 4; + v |= v >> 8; + v |= v >> 16; + ++v; + return v; +} + void QTextureGlyphCache::populate(QFontEngine *fontEngine, int numGlyphs, const glyph_t *glyphs, const QFixedPoint *) { @@ -115,7 +129,7 @@ void QTextureGlyphCache::populate(QFontEngine *fontEngine, int numGlyphs, const rowHeight += margin * 2; if (isNull()) - createCache(QT_DEFAULT_TEXTURE_GLYPH_CACHE_WIDTH, rowHeight); + createCache(QT_DEFAULT_TEXTURE_GLYPH_CACHE_WIDTH, qt_next_power_of_two(rowHeight)); // now actually use the coords and paint the wanted glyps into cache. QHash<glyph_t, Coord>::iterator iter = listItemCoordinates.begin(); @@ -128,13 +142,9 @@ void QTextureGlyphCache::populate(QFontEngine *fontEngine, int numGlyphs, const m_cy = m_h; } if (m_cy + c.h > m_h) { - int new_height; - if (m_cx == 0) { // add a whole row - new_height = m_h + rowHeight; - m_cy = m_h; - } else { // just extend row - new_height = m_cy + rowHeight; - } + int new_height = m_h*2; + while (new_height < m_cy + c.h) + new_height *= 2; // if no room in the current texture - realloc a larger texture resizeTextureData(m_w, new_height); m_h = new_height; |