Function convertRG8ToRGBA4

core/renderer/backend/PixelFormatUtils.cpp:199–209

IIIIIIIIAAAAAAAA -> RRRRGGGGBBBBAAAA

// IIIIIIIIAAAAAAAA -> RRRRGGGGBBBBAAAA
static void convertRG8ToRGBA4(const unsigned char* data, size_t dataLen, unsigned char* outData)
{
    unsigned short* out16 = (unsigned short*)outData;
    for (ssize_t i = 0, l = dataLen - 1; i < l; i += 2)
    {
        *out16++ = (data[i] & 0x00F0) << 8         // R
                   | (data[i + 1] & 0x00F0) << 4   // G
                   | (data[i] & 0x00F0)            // B
                   | (data[i + 1] & 0x00F0) >> 4;  // A
    }
}

// IIIIIIII -> RRRRRGGGGGBBBBBA
static void convertR8ToRGB5A1(const unsigned char* data, size_t dataLen, unsigned char* outData)