diff options
Diffstat (limited to 'gfx/cairo/win32-cleartype-clipping.patch')
-rw-r--r-- | gfx/cairo/win32-cleartype-clipping.patch | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/gfx/cairo/win32-cleartype-clipping.patch b/gfx/cairo/win32-cleartype-clipping.patch new file mode 100644 index 000000000..839e94039 --- /dev/null +++ b/gfx/cairo/win32-cleartype-clipping.patch @@ -0,0 +1,23 @@ +diff --git a/gfx/cairo/cairo/src/cairo-win32-font.c b/gfx/cairo/cairo/src/cairo-win32-font.c +--- a/gfx/cairo/cairo/src/cairo-win32-font.c ++++ b/gfx/cairo/cairo/src/cairo-win32-font.c +@@ -986,6 +986,19 @@ _cairo_win32_scaled_font_init_glyph_metr + &metrics, 0, NULL, &matrix) == GDI_ERROR) { + status = _cairo_win32_print_gdi_error ("_cairo_win32_scaled_font_init_glyph_metrics:GetGlyphOutlineW"); + memset (&metrics, 0, sizeof (GLYPHMETRICS)); ++ } else { ++ if (metrics.gmBlackBoxX > 0 && scaled_font->base.options.antialias != CAIRO_ANTIALIAS_NONE) { ++ /* The bounding box reported by Windows supposedly contains the glyph's "black" area; ++ * however, antialiasing (especially with ClearType) means that the actual image that ++ * needs to be rendered may "bleed" into the adjacent pixels, mainly on the right side. ++ * To avoid clipping the glyphs when drawn by _cairo_surface_fallback_show_glyphs, ++ * for example, or other code that uses glyph extents to determine the area to update, ++ * we add a pixel of "slop" to left side of the nominal "black" area returned by GDI, ++ * and two pixels to the right (as tests show some glyphs bleed into this column). ++ */ ++ metrics.gmptGlyphOrigin.x -= 1; ++ metrics.gmBlackBoxX += 3; ++ } + } + cairo_win32_scaled_font_done_font (&scaled_font->base); + if (status) |