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Resolves: fdo#47432 Improve the "faux bold" in cairo canvas

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The "faux bold" make the bold font in Asian ugly & unacceptable,
Adjust & improve the "faux bold" to make the bold font better.

Change-Id: I2e02156ffc30629476b80134ffb0b50e793f7ead
This commit is contained in:
Flex Liu
2012-10-26 15:18:35 +01:00
committed by Caolán McNamara
parent 9ffc1f4e03
commit b6aa58c4d8
1 changed files with 3 additions and 2 deletions
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5
canvas/source/cairo/cairo_textlayout.cxx
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@@ -609,14 +609,15 @@ namespace cairocanvas
if (rSysFontData.bFakeBold)
{
double bold_dx = 0.5 * sqrt( 0.7 * aFont.GetHeight() );
int total_steps = 2 * ((int) (bold_dx + 0.5));
int total_steps = 1 * ((int) (bold_dx + 0.5));
// loop to draw the text for every half pixel of displacement
for (int nSteps = 0; nSteps < total_steps; nSteps++)
{
for(int nGlyphIdx = 0; nGlyphIdx < (int) cairo_glyphs.size(); nGlyphIdx++)
{
cairo_glyphs[nGlyphIdx].x += bold_dx * nSteps / total_steps;
cairo_glyphs[nGlyphIdx].x += (bold_dx * nSteps / total_steps) / 4;
cairo_glyphs[nGlyphIdx].y -= (bold_dx * nSteps / total_steps) / 4;
}
cairo_show_glyphs(pSCairo.get(), &cairo_glyphs[0], cairo_glyphs.size());
}