diff options
| -rw-r--r-- | src/opengl/gl2paintengineex/qtextureglyphcache_gl.cpp | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/src/opengl/gl2paintengineex/qtextureglyphcache_gl.cpp b/src/opengl/gl2paintengineex/qtextureglyphcache_gl.cpp index 4034448..0720170 100644 --- a/src/opengl/gl2paintengineex/qtextureglyphcache_gl.cpp +++ b/src/opengl/gl2paintengineex/qtextureglyphcache_gl.cpp @@ -81,7 +81,7 @@ void QGLTextureGlyphCache::createTextureData(int width, int height) data[i] = 0; if (m_type == QFontEngineGlyphCache::Raster_RGBMask) - glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_ALPHA, GL_UNSIGNED_BYTE, &data[0]); + glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_ALPHA, GL_UNSIGNED_BYTE, &data[0]); else glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, width, height, 0, GL_ALPHA, GL_UNSIGNED_BYTE, &data[0]); @@ -196,8 +196,20 @@ void QGLTextureGlyphCache::fillTexture(const Coord &c, glyph_t glyph) for (int x = 0; x < maskWidth; ++x) src[x] = -src[x]; // convert 0 and 1 into 0 and 255 } - } - + } else if (mask.format() == QImage::Format_RGB32) { + // Make the alpha component equal to the average of the RGB values. + // This is needed when drawing sub-pixel antialiased text on translucent targets. + for (int y = 0; y < maskHeight; ++y) { + quint32 *src = (quint32 *) mask.scanLine(y); + for (int x = 0; x < maskWidth; ++x) { + uchar r = src[x] >> 16; + uchar g = src[x] >> 8; + uchar b = src[x]; + quint32 avg = (quint32(r) + quint32(g) + quint32(b) + 1) / 3; // "+1" for rounding. + src[x] = (src[x] & 0x00ffffff) | (avg << 24); + } + } + } glBindTexture(GL_TEXTURE_2D, m_texture); if (mask.format() == QImage::Format_RGB32) { |