Hello,
I made python scripts that draw PM2.5 Pollution forecast heat maps as GIFs, example:
When I first implemented UNIGIF to read and display those GIFs in Unity the C# compiler came up with the following error:
So I tweaked the UnigifDecoder.cs script with AI to bypass that error:
` private static List<byte[]> GetColorTableAndSetBgColor(
GifData gifData,
ImageBlock imgBlock,
int transparentIndex,
out Color32 bgColor)
{
List<byte[]> colorTable = null;
// 1️⃣ Prefer LOCAL color table only if it is valid
if (imgBlock.m_localColorTableFlag &&
imgBlock.m_localColorTable != null &&
imgBlock.m_localColorTable.Count > 0)
{
colorTable = imgBlock.m_localColorTable;
}
// 2️⃣ Fallback to GLOBAL color table
else if (gifData.m_globalColorTableFlag &&
gifData.m_globalColorTable != null &&
gifData.m_globalColorTable.Count > 0)
{
colorTable = gifData.m_globalColorTable;
}
// 3️⃣ Final fallback: try whatever exists
if (colorTable == null)
{
if (gifData.m_globalColorTable != null && gifData.m_globalColorTable.Count > 0)
colorTable = gifData.m_globalColorTable;
else if (imgBlock.m_localColorTable != null && imgBlock.m_localColorTable.Count > 0)
colorTable = imgBlock.m_localColorTable;
}
// 4️⃣ Background color handling
if (colorTable != null && colorTable.Count > 0)
{
int bgIndex = gifData.m_bgColorIndex;
// Clamp background index safely
if (bgIndex < 0 || bgIndex >= colorTable.Count)
bgIndex = 0;
byte[] bgRgb = colorTable[bgIndex];
byte alpha = (transparentIndex == bgIndex)
? (byte)0
: (byte)255;
bgColor = new Color32(
bgRgb[0],
bgRgb[1],
bgRgb[2],
alpha
);
}
else
{
// Absolute fallback (rare but safe)
bgColor = new Color32(0, 0, 0, 255);
}
return colorTable;
}`
... and:
`private static void SetTexturePixelRow(GifData gifData,
Texture2D tex,
int y,
ImageBlock imgBlock,
byte[] decodedData,
ref int dataIndex,
List<byte[]> colorTable,
Color32 bgColor,
int transparentIndex,
bool filledTexture)
{
// Convert from top-left origin to bottom-left (Unity)
int row = tex.height - 1 - y;
for (int x = 0; x < tex.width; x++)
{
// Check if the pixel is outside the image block
if (row < imgBlock.m_imageTopPosition ||
row >= imgBlock.m_imageTopPosition + imgBlock.m_imageHeight ||
x < imgBlock.m_imageLeftPosition ||
x >= imgBlock.m_imageLeftPosition + imgBlock.m_imageWidth)
{
if (!filledTexture)
{
tex.SetPixel(x, y, bgColor);
}
continue;
}
// Check if decoded data is exhausted
if (dataIndex >= decodedData.Length)
{
if (!filledTexture)
{
tex.SetPixel(x, y, bgColor);
}
dataIndex++;
continue;
}
// --- Safe palette lookup ---
byte colorIndex = decodedData[dataIndex];
int safeIndex;
if (colorTable != null && colorIndex < colorTable.Count)
{
// Index is valid
safeIndex = colorIndex;
}
else
{
// Browser-style recovery: try background index, else 0
if (gifData.m_bgColorIndex >= 0 && gifData.m_bgColorIndex < colorTable.Count)
{
safeIndex = gifData.m_bgColorIndex;
}
else
{
safeIndex = 0;
}
}
byte[] rgb = colorTable[safeIndex];
// Handle transparency
byte alpha = (transparentIndex >= 0 && colorIndex == transparentIndex) ? (byte)0 : (byte)255;
// Set pixel if filledTexture is false or pixel is not fully transparent
if (!filledTexture || alpha != 0)
{
tex.SetPixel(x, y, new Color32(rgb[0], rgb[1], rgb[2], alpha));
}
dataIndex++;
}
}
`
But the GIF rendu in unity is degraded: https://youtu.be/GW0eJrVa9VI
Any idea of how I can fix this to replicate the exact GIF in unity?
B.R,
Ludovic
Hello,
I made python scripts that draw PM2.5 Pollution forecast heat maps as GIFs, example:
When I first implemented UNIGIF to read and display those GIFs in Unity the C# compiler came up with the following error:
So I tweaked the UnigifDecoder.cs script with AI to bypass that error:
` private static List<byte[]> GetColorTableAndSetBgColor(
GifData gifData,
ImageBlock imgBlock,
int transparentIndex,
out Color32 bgColor)
{
List<byte[]> colorTable = null;
... and:
`private static void SetTexturePixelRow(GifData gifData,
Texture2D tex,
int y,
ImageBlock imgBlock,
byte[] decodedData,
ref int dataIndex,
List<byte[]> colorTable,
Color32 bgColor,
int transparentIndex,
bool filledTexture)
{
// Convert from top-left origin to bottom-left (Unity)
int row = tex.height - 1 - y;
}
`
But the GIF rendu in unity is degraded: https://youtu.be/GW0eJrVa9VI
Any idea of how I can fix this to replicate the exact GIF in unity?
B.R,
Ludovic