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cleaner YUV/RGB conversion code

This commit is contained in:
Arisotura 2022-04-17 13:34:59 +02:00
parent e637f9d91d
commit 34f0c2e6ed
1 changed files with 12 additions and 14 deletions
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26
src/DSi_Camera.cpp
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@ -194,18 +194,18 @@ void TransferScanline(u32 line)
int y2 = (val >> 16) & 0xFF;
int v = (val >> 24) & 0xFF;
int r1 = y1 + (((v-0x80) * 91881) >> 16);
int g1 = y1 - (((v-0x80) * 46793) >> 16) - (((u-0x80) * 22544) >> 16);
int b1 = y1 + (((u-0x80) * 116129) >> 16);
u -= 128; v -= 128;
int r2 = y2 + (((v-0x80) * 91881) >> 16);
int g2 = y2 - (((v-0x80) * 46793) >> 16) - (((u-0x80) * 22544) >> 16);
int b2 = y2 + (((u-0x80) * 116129) >> 16);
int r1 = y1 + ((v * 91881) >> 16);
int g1 = y1 - ((v * 46793) >> 16) - ((u * 22544) >> 16);
int b1 = y1 + ((u * 116129) >> 16);
#define CLAMP(v) if (v < 0) v = 0; else if (v > 255) v = 255;
CLAMP(r1); CLAMP(g1); CLAMP(b1);
CLAMP(r2); CLAMP(g2); CLAMP(b2);
#undef CLAMP
int r2 = y2 + ((v * 91881) >> 16);
int g2 = y2 - ((v * 46793) >> 16) - ((u * 22544) >> 16);
int b2 = y2 + ((u * 116129) >> 16);
r1 = std::clamp(r1, 0, 255); g1 = std::clamp(g1, 0, 255); b1 = std::clamp(b1, 0, 255);
r2 = std::clamp(r2, 0, 255); g2 = std::clamp(g2, 0, 255); b2 = std::clamp(b2, 0, 255);
u32 col1 = (r1 >> 3) | ((g1 >> 3) << 5) | ((b1 >> 3) << 10) | 0x8000;
u32 col2 = (r2 >> 3) | ((g2 >> 3) << 5) | ((b2 >> 3) << 10) | 0x8000;
@ -559,10 +559,8 @@ int Camera::TransferScanline(u32* buffer, int maxlen)
u1 += 128; v1 += 128;
u2 += 128; v2 += 128;
#define CLAMP(v) if (v < 0) v = 0; else if (v > 255) v = 255;
CLAMP(y1); CLAMP(u1); CLAMP(v1);
CLAMP(y2); CLAMP(u2); CLAMP(v2);
#undef CLAMP
y1 = std::clamp(y1, 0, 255); u1 = std::clamp(u1, 0, 255); v1 = std::clamp(v1, 0, 255);
y2 = std::clamp(y2, 0, 255); u2 = std::clamp(u2, 0, 255); v2 = std::clamp(v2, 0, 255);
// huh
u1 = (u1 + u2) >> 1;