c-灰度图彩色化

void Test_fakeColorDis(uint8_t *gray, uint8_t* dstColor, int32_t dstWidth, int32_t dstHeight, int32_t dstStride)
{
    for (int32_t h = 0, i = 0; h < dstHeight; h++)
    {
        for (int32_t w = 0; w < dstWidth; w++, i += 3)
        {
            uint8_t grayValues = gray[h * dstStride + w];

            if (grayValues < 64)
            {
                dstColor[i + 2] = 0;
                dstColor[i + 1] = (byte)(4 * grayValues);
                dstColor[i] = 255;
            }
            else if (grayValues < 128)
            {
                dstColor[i + 2] = 0;
                dstColor[i + 1] = 255;
                dstColor[i] = (byte)(-4 * grayValues + 2 * 255);
            }
            else if (grayValues < 192)
            {
                dstColor[i + 2] = (byte)(4 * grayValues - 2 * 255);
                dstColor[i + 1] = 255;
                dstColor[i] = 0;
            }
            else
            {
                dstColor[i + 2] = 255;
                dstColor[i + 1] = (byte)(-4 * grayValues + 4 * 255);
                dstColor[i] = 0;
            }
        }
    }
}