Function iLoadTplInternal

DevIL/src-IL/src/il_tpl.cpp:188–592

Internal function used to load the TPL.

// Internal function used to load the TPL.
ILboolean iLoadTplInternal(void)
{
	TPLHEAD		Header;
	ILimage		*Image/*, *BaseImage*/;
	ILuint		Pos, TexOff, PalOff, DataFormat, Bpp, DataOff, WrapS, WrapT;
	ILuint		x, y, xBlock, yBlock, i, j, k, n;
	ILenum		Format;
	ILushort	Width, Height, ShortPixel;
	ILubyte		BytePixel, CompData[8];
	Color8888	colours[4], *col;
	ILushort	color_0, color_1;
	ILuint		bitmask, Select;

	if (iCurImage == NULL) {
		ilSetError(IL_ILLEGAL_OPERATION);
		return IL_FALSE;
	}
	Image = iCurImage;  // Top-level image
	
	if (!iGetTplHead(&Header))
		return IL_FALSE;
	if (!iCheckTpl(&Header)) {
		ilSetError(IL_INVALID_FILE_HEADER);
		return IL_FALSE;
	}

	// Points to the beginning of the texture header directory.
	Pos = itell();

	for (n = 0; n < Header.nTextures; n++) {
		// Go back to the texture header directory for texture number n+1.
		iseek(Pos + n * 8, IL_SEEK_SET);
		TexOff = GetBigUInt();
		PalOff = GetBigUInt();
		// Go to the texture header.
		if (iseek(TexOff, IL_SEEK_SET))
			return IL_FALSE;

		Height = GetBigUShort();
		Width = GetBigUShort();
		// It looks like files actually have n-1 images, with the nth one having 0 height and width.
		if (Width == 0 || Height == 0) {
			// If this is our first image, however, we error out.
			if (Image == iCurImage) {
				ilSetError(IL_ILLEGAL_FILE_VALUE);
				return IL_FALSE;
			}
			// Break out of our for loop and run ilFixImage on the images.
			break;
		}

		DataFormat = GetBigUInt();
		TexOff = GetBigUInt();
		WrapS = GetBigUInt();
		WrapT = GetBigUInt();
		if (WrapS == TPL_REPEAT || WrapS == TPL_MIRROR) {
			// By the specs, repeated and mirrored textures must have dimensions of power of 2.
			if ((Width != ilNextPower2(Width)) || (Height != ilNextPower2(Height))) {