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// Copyright 2009 Dolphin Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include "Common/ColorUtil.h"
#include "Common/Swap.h"
namespace Common
{
static const int s_lut5to8[] = {0x00, 0x08, 0x10, 0x18, 0x20, 0x29, 0x31, 0x39, 0x41, 0x4A, 0x52,
0x5A, 0x62, 0x6A, 0x73, 0x7B, 0x83, 0x8B, 0x94, 0x9C, 0xA4, 0xAC,
0xB4, 0xBD, 0xC5, 0xCD, 0xD5, 0xDE, 0xE6, 0xEE, 0xF6, 0xFF};
static const int s_lut4to8[] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
0x88, 0x99, 0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xFF};
static const int s_lut3to8[] = {0x00, 0x24, 0x48, 0x6D, 0x91, 0xB6, 0xDA, 0xFF};
static u32 Decode5A3(u16 val)
{
const u32 bg_color = 0x00000000;
int r, g, b, a;
if (val & 0x8000)
{
r = s_lut5to8[(val >> 10) & 0x1f];
g = s_lut5to8[(val >> 5) & 0x1f];
b = s_lut5to8[(val) & 0x1f];
a = 0xFF;
}
else
{
a = s_lut3to8[(val >> 12) & 0x7];
r = (s_lut4to8[(val >> 8) & 0xf] * a + (bg_color & 0xFF) * (255 - a)) / 255;
g = (s_lut4to8[(val >> 4) & 0xf] * a + ((bg_color >> 8) & 0xFF) * (255 - a)) / 255;
b = (s_lut4to8[(val) & 0xf] * a + ((bg_color >> 16) & 0xFF) * (255 - a)) / 255;
a = 0xFF;
}
return (a << 24) | (r << 16) | (g << 8) | b;
}
void Decode5A3Image(u32* dst, const u16* src, int width, int height)
{
for (int y = 0; y < height; y += 4)
{
for (int x = 0; x < width; x += 4)
{
for (int iy = 0; iy < 4; iy++, src += 4)
{
for (int ix = 0; ix < 4; ix++)
{
u32 RGBA = Decode5A3(Common::swap16(src[ix]));
dst[(y + iy) * width + (x + ix)] = RGBA;
}
}
}
}
}
void DecodeCI8Image(u32* dst, const u8* src, const u16* pal, int width, int height)
{
for (int y = 0; y < height; y += 4)
{
for (int x = 0; x < width; x += 8)
{
for (int iy = 0; iy < 4; iy++, src += 8)
{
u32* tdst = dst + (y + iy) * width + x;
for (int ix = 0; ix < 8; ix++)
{
// huh, this seems wrong. CI8, not 5A3, no?
tdst[ix] = Decode5A3(Common::swap16(pal[src[ix]]));
}
}
}
}
}
} // namespace Common
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