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Add support to more color formats

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- RGBA4444: fully working
- RGBA5551: fully not working
- LA8, LA4: fully working
This commit is contained in:
tobid7
2026-01-08 18:59:47 +01:00
parent 86461481ae
commit f5a58278db
5 changed files with 137 additions and 13 deletions
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114
source/pica.cpp
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@@ -85,6 +85,64 @@ CTRFF_API void EncodeImage(std::vector<ctrff::u8>& ret,
}
}
break;
case RGBA4444:
ret.resize(w * h * 2);
for (int x = 0; x < w; x++) {
for (int y = 0; y < h; y++) {
int src = (y * w + x) * 4; // basic rgba indexing btw
int dst = ctrff::TileIndex(x, y, w) * 2;
ret[dst + 0] = rgba[src + 3] >> 4;
ret[dst + 0] |= (rgba[src + 2] >> 4) << 4;
ret[dst + 1] = rgba[src + 1] >> 4;
ret[dst + 1] |= (rgba[src + 0] >> 4) << 4;
}
}
break;
case RGBA5551: // not working ???
ret.resize(w * h * 2);
for (int x = 0; x < w; x++) {
for (int y = 0; y < h; y++) {
int src = (y * w + x) * 4; // basic rgba indexing btw
int dst = ctrff::TileIndex(x, y, w) * 2;
ctrff::u16 px = 0;
px |= (rgba[src + 3] < 128 ? 0 : 1) << 15; // A
px |= ((rgba[src + 2] >> 3) & 0x1f) << 10; // BBBBB
px |= ((rgba[src + 1] >> 3) & 0x1f) << 5; // GGGGG
px |= ((rgba[src + 0] >> 3) & 0x1f); // RRRRR
ret[dst] = px & 0xff;
ret[dst + 1] = (px << 8) & 0xff;
}
}
break;
case LA8:
ret.resize(w * h * 2);
for (int x = 0; x < w; x++) {
for (int y = 0; y < h; y++) {
int src = (y * w + x) * 4; // basic rgba indexing btw
int dst = ctrff::TileIndex(x, y, w) * 2;
ret[dst] =
(rgba[src + 0] * 77 + rgba[src + 1] * 150 + rgba[src + 2] * 29) >>
8;
ret[dst + 1] = rgba[src + 3];
}
}
break;
case LA4:
ret.resize(w * h);
for (int x = 0; x < w; x++) {
for (int y = 0; y < h; y++) {
int src = (y * w + x) * 4; // basic rgba indexing btw
int dst = ctrff::TileIndex(x, y, w);
ret[dst] = 0;
ret[dst] |= (((rgba[src + 0] * 77 + rgba[src + 1] * 150 +
rgba[src + 2] * 29) >>
8) >>
4) &
0xf;
ret[dst] |= (((rgba[src + 3] >> 4) & 0xf) << 4) | ret[dst];
}
}
break;
default:
throw std::runtime_error("[ctrff] Pica: Unsupported Color format: " +
@@ -186,6 +244,62 @@ CTRFF_API void DecodeImage(std::vector<ctrff::u8>& ret,
}
}
break;
case RGBA4444:
ret.resize(w * h * 4);
for (int x = 0; x < w; x++) {
for (int y = 0; y < h; y++) {
int src = ctrff::TileIndex(x, y, w) * 2;
int dst = (y * w + x) * 4; // basic rgba indexing btw
ret[dst + 0] = ((pixels[src + 1] >> 4) & 0xf) << 4;
ret[dst + 1] = (pixels[src + 1] & 0xf) << 4;
ret[dst + 2] = ((pixels[src + 0] >> 4) & 0xf) << 4;
ret[dst + 3] = (pixels[src + 0] & 0xf) << 4;
}
}
break;
case RGBA5551: // not working
ret.resize(w * h * 4);
for (int x = 0; x < w; x++) {
for (int y = 0; y < h; y++) {
int src = ctrff::TileIndex(x, y, w) * 2;
int dst = (y * w + x) * 4; // basic rgba indexing btw
ctrff::u16 px = ret[src] | (ret[src + 1] << 8);
ret[dst + 0] = (px & 0x1f) * 0x1f;
ret[dst + 1] = ((px >> 5) & 0x1f) * 0x1f;
ret[dst + 2] = ((px >> 10) & 0x1f) * 0x1f;
ret[dst + 3] = 255; // ((*px >> 15) & 0x1) ? 255 : 0;
}
}
break;
case LA8:
ret.resize(w * h * 4);
for (int x = 0; x < w; x++) {
for (int y = 0; y < h; y++) {
int src = ctrff::TileIndex(x, y, w) * 2;
int dst = (y * w + x) * 4;
ret[dst + 0] = pixels[src];
ret[dst + 1] = pixels[src];
ret[dst + 2] = pixels[src];
ret[dst + 3] = pixels[src + 1];
}
}
break;
case LA4:
ret.resize(w * h * 4);
for (int x = 0; x < w; x++) {
for (int y = 0; y < h; y++) {
int src = ctrff::TileIndex(x, y, w);
int dst = (y * w + x) * 4;
uint8_t l = (pixels[src] & 0xf) * 0x11;
uint8_t a = ((pixels[src] >> 4) & 0xf) * 0x11;
ret[dst + 0] = l;
ret[dst + 1] = l;
ret[dst + 2] = l;
ret[dst + 3] = a;
}
}
break;
default:
throw std::runtime_error("[ctrff] Pica: Unsupported Color format: " +