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libpayload: video: Add support for font scaling with a factor

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This introduces support for font scaling with a factor provided via
Kconfig. In practice, the font itself is not scaled at any point in
memory and only the logic to determine whether a pixel should be filled
or not is changed.

Thus, it should not significantly impact either the access time or
memory use.

Change-Id: Idff210617c9ec08c6034aef107cfdb34c7cdf029
Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
Reviewed-on: https://review.coreboot.org/20709
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
This commit is contained in:
Paul Kocialkowski
2017-07-23 16:05:47 +03:00
committed by Martin Roth
parent 1c0b603673
commit d85e485c58
5 changed files with 24 additions and 7 deletions
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5
payloads/libpayload/drivers/video/font.h
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@@ -34,13 +34,14 @@
extern int font_width;
extern int font_height;
extern int font_scale;
inline int font_glyph_filled(unsigned int ch, int x, int y)
{
unsigned char *glyph = font8x16 + ((ch & 0xFF) * FONT_HEIGHT);
return glyph[y] & (1 << x);
return glyph[y/font_scale] & (1 << x/font_scale);
}
void font_init(void);
void font_init(int width);
#endif