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Calculate blended palette index

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Marijn van der Werf
2017-10-13 14:21:44 +02:00
parent 0ed3ef3704
commit d6349d0095
1 changed files with 45 additions and 21 deletions
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66
src/openrct2/drawing/string.c
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@@ -717,6 +717,48 @@ static void ttf_draw_string_raw_sprite(rct_drawpixelinfo *dpi, const utf8 *text,
#ifndef NO_TTF
static uint8 colormap[256][256] = {0};
uint8 findClosestIndex(uint8 red, uint8 green, uint8 blue)
{
sint16 closest = -1;
sint32 closestDistance = INT32_MAX;
for (int i = 0; i < 256; i++)
{
const int distance =
pow(gPalette[i].red - red, 2) + pow(gPalette[i].green - green, 2) + pow(gPalette[i].blue - blue, 2);
if (distance < closestDistance)
{
closest = i;
closestDistance = distance;
}
}
return closest;
}
uint8 blend(const uint8 base, const uint8 layer)
{
const uint8 cMin = min(base, layer);
const uint8 cMax = max(base, layer);
if (colormap[cMin][cMax] != 0)
{
return colormap[cMin][cMax];
}
log_info("Blending colours %d and %d", cMin, cMax);
uint8 red = (gPalette[cMin].red + gPalette[cMax].red) / 2;
uint8 green = (gPalette[cMin].green + gPalette[cMax].green) / 2;
uint8 blue = (gPalette[cMin].blue + gPalette[cMax].blue) / 2;
colormap[cMin][cMax] = findClosestIndex(red, green, blue);
return colormap[cMin][cMax];
}
static void ttf_draw_string_raw_ttf(rct_drawpixelinfo *dpi, const utf8 *text, text_draw_info *info)
{
if (!ttf_initialise())
@@ -805,36 +847,18 @@ static void ttf_draw_string_raw_ttf(rct_drawpixelinfo *dpi, const utf8 *text, te
// Centre of the glyph: use full colour.
*dst = colour;
}
else if (*dst < 10 && *src > 50)
{
// For black backgrounds, hint using grey pixels.
*dst = ColourMapA[COLOUR_WHITE].colour_0;
}
else if (*src > 70)
else if (*src > 80)
{
// Simulate font hinting by shading the background colour instead.
if (info->flags & TEXT_DRAW_FLAG_OUTLINE)
{
// As outlines are black, these texts should always use a darker shade
// of the foreground colour for font hinting.
*dst = ColourMapA[COLOUR_WHITE].colour_1;
}
else if (colour == ColourMapA[COLOUR_DARK_GREEN].colour_11)
{
// Exception: theme window text colour.
*dst = ColourMapA[COLOUR_DARK_GREEN].lightest;
}
else if (colour == ColourMapA[COLOUR_BRIGHT_RED].light)
{
// Exception: losses in finance window.
*dst = ColourMapA[COLOUR_BRIGHT_RED].lightest;
*dst = blend(colour, PALETTE_INDEX_0);
}
else
{
// For other texts, hinting direction depends on the intensity of the
// foreground colour.
bool intensive = colour % 12 > 4 && colour % 12 < 10;
*dst += intensive ? 2 : -3;
*dst = blend(colour, *dst);
}
}
}