Function ReadGrey

DevIL/src-IL/src/il_psd.cpp:227–282

ILboolean ReadGrey(PSDHEAD *Head)
{
	ILuint		ColorMode, ResourceSize, MiscInfo;
	ILushort	Compressed;
	ILenum		Type;
	ILubyte		*Resources = NULL;

	ColorMode = GetBigUInt();  // Skip over the 'color mode data section'
	iseek(ColorMode, IL_SEEK_CUR);

	ResourceSize = GetBigUInt();  // Read the 'image resources section'
	Resources = (ILubyte*)ialloc(ResourceSize);
	if (Resources == NULL) {
		return IL_FALSE;
	}
	if (iread(Resources, 1, ResourceSize) != ResourceSize)
		goto cleanup_error;

	MiscInfo = GetBigUInt();
	iseek(MiscInfo, IL_SEEK_CUR);

	Compressed = GetBigUShort();

	ChannelNum = Head->Channels;
	Head->Channels = 1;  // Temporary to read only one channel...some greyscale .psd files have 2.
	if (Head->Channels != 1) {
		ilSetError(IL_FORMAT_NOT_SUPPORTED);
		return IL_FALSE;
	}
	switch (Head->Depth)
	{
		case 8:
			Type = IL_UNSIGNED_BYTE;
			break;
		case 16:
			Type = IL_UNSIGNED_SHORT;
			break;
		default:
			ilSetError(IL_FORMAT_NOT_SUPPORTED);
			return IL_FALSE;
	}

	if (!ilTexImage(Head->Width, Head->Height, 1, 1, IL_LUMINANCE, Type, NULL))
		goto cleanup_error;
	if (!PsdGetData(Head, iCurImage->Data, (ILboolean)Compressed))
		goto cleanup_error;
	if (!ParseResources(ResourceSize, Resources))
		goto cleanup_error;
	ifree(Resources);

	return IL_TRUE;

cleanup_error:
	ifree(Resources);
	return IL_FALSE;
}