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Adjust text AA to be more gamma-correct. Switch everything to Open Sans.

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elasota
2020-01-19 07:36:44 -05:00
parent 93b4554961
commit 1b5720c118
17 changed files with 428 additions and 157 deletions
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66
PortabilityLayer/AntiAliasTable.cpp
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@@ -1,9 +1,10 @@
#include "AntiAliasTable.h"
#include "RGBAColor.h"
// TODO: This is not gamma correct... do we care?
// TODO: This is not gamma correct...
namespace PortabilityLayer
{
#if 0
void AntiAliasTable::GenerateForPalette(const RGBAColor &baseColorRef, const RGBAColor *colors, size_t numColors)
{
const RGBAColor baseColor = baseColorRef;
@@ -53,4 +54,67 @@ namespace PortabilityLayer
}
}
}
#else
void AntiAliasTable::GenerateForPalette(const RGBAColor &baseColorRef, const RGBAColor *colors, size_t numColors)
{
const RGBAColor baseColor = baseColorRef;
if (numColors > 256)
numColors = 256;
unsigned int baseCh[3] = { baseColor.r, baseColor.g, baseColor.b };
unsigned int baseChLinear[3];
for (int i = 0; i < 3; i++)
baseChLinear[i] = baseCh[i] * baseCh[i];
for (size_t i = 0; i < numColors; i++)
{
const RGBAColor existingColor = colors[i];
unsigned int existingCh[3] = { existingColor.r, existingColor.g, existingColor.b };
unsigned int existingChLinear[3];
for (int i = 0; i < 3; i++)
existingChLinear[i] = existingCh[i] * existingCh[i];
// 0 alpha is always the same color
m_aaTranslate[i][0] = static_cast<uint8_t>(i);
for (unsigned int b = 1; b < 16; b++)
{
uint32_t newChLinear[3];
for (unsigned int ch = 0; ch < 3; ch++)
newChLinear[ch] = (15 - b) * existingChLinear[ch] + b * baseChLinear[ch];
uint64_t bestError = UINT64_MAX;
size_t bestColor = 0;
for (size_t cmp = 0; cmp < numColors; cmp++)
{
int32_t compareColor[3] = { colors[cmp].r, colors[cmp].g, colors[cmp].b };
for (unsigned int ch = 0; ch < 3; ch++)
{
compareColor[ch] = compareColor[ch] * compareColor[ch] * 15;
}
uint64_t error = 0;
for (unsigned int ch = 0; ch < 3; ch++)
{
int64_t delta = static_cast<int32_t>(newChLinear[ch]) - compareColor[ch];
error += static_cast<uint64_t>(delta * delta);
}
if (error < bestError)
{
bestError = error;
bestColor = cmp;
}
}
m_aaTranslate[i][b] = static_cast<uint8_t>(bestColor);
}
}
}
#endif
}