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Merge pull request #7967 from jdgleaver/rgui-gekko-colour-fix

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(RGUI) Fix background + border colours for Gekko platforms
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Twinaphex 2019-01-10 15:16:31 +01:00 committed by GitHub
commit 5a12ca642c
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1 changed files with 35 additions and 5 deletions
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40
menu/drivers/rgui.c
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@ -451,11 +451,41 @@ static uint16_t argb32_to_abgr1555(uint32_t col)
static uint16_t argb32_to_rgb5a3(uint32_t col)
{
unsigned a = ((col >> 24) & 0xff) >> 5;
unsigned r = ((col >> 16) & 0xff) >> 4;
unsigned g = ((col >> 8) & 0xff) >> 4;
unsigned b = ((col & 0xff) ) >> 4;
return (a << 12) | (r << 8) | (g << 4) | b;
/* Extract colour components */
unsigned a = (col >> 24) & 0xff;
unsigned r = (col >> 16) & 0xff;
unsigned g = (col >> 8) & 0xff;
unsigned b = col & 0xff;
/* Gekko platforms only have a 3 bit alpha channel, which
* is one bit less than all 'standard' target platforms.
* As a result, Gekko colours are effectively ~6-7% less
* transparent than expected, which causes backgrounds and
* borders to appear too bright. We therefore have to darken
* each RGB component according to the difference between Gekko
* alpha and normal 4 bit alpha values... */
unsigned a4 = a >> 4;
unsigned a3 = a >> 5;
float a_factor = 1.0;
if (a3 > 0)
{
/* Avoid divide by zero errors... */
a_factor = ((float)a4 * (1.0 / 15.0)) / ((float)a3 * (1.0 / 7.0));
}
r = (unsigned)(((float)r * a_factor) + 0.5);
g = (unsigned)(((float)g * a_factor) + 0.5);
b = (unsigned)(((float)b * a_factor) + 0.5);
/* a_factor can actually be greater than 1. This will never happen
* with the current preset theme colour values, but users can set
* any custom values they like, so we have to play it safe... */
r = (r <= 0xff) ? r : 0xff;
g = (g <= 0xff) ? g : 0xff;
b = (b <= 0xff) ? b : 0xff;
/* Convert RGB from 8 bit to 4 bit */
r = r >> 4;
g = g >> 4;
b = b >> 4;
/* Return final value */
return (a3 << 12) | (r << 8) | (g << 4) | b;
}
#define argb32_to_pixel_platform_format(color) argb32_to_rgb5a3(color)