C++ CStr::BeforeFirst方法代码示例

void GUIRenderer::UpdateDrawCallCache(DrawCalls& Calls, const CStr& SpriteName, const CRect& Size, int CellID, std::map<CStr, CGUISprite*>& Sprites)
{
	// This is called only when something has changed (like the size of the
	// sprite), so it doesn't need to be particularly efficient.

	// Clean up the old data
	Calls.clear();

	// If this object has zero size, there's nothing to render. (This happens
	// with e.g. tooltips that have zero size before they're first drawn, so
	// it isn't necessarily an error.)
	if (Size.left == Size.right && Size.top == Size.bottom)
		return;


	std::map<CStr, CGUISprite*>::iterator it(Sprites.find(SpriteName));
	if (it == Sprites.end())
	{
		/*
		 * Sprite not found. Check whether this a special sprite,
		 * and if so create a new sprite:
		 * "stretched:filename.ext" - stretched image
		 * "stretched:grayscale:filename.ext" - stretched grayscale image.
		 * "cropped:0.5, 0.25"    - stretch this ratio (x,y) of the top left of the image
		 * "color:r g b a"        - solid color
		 *     > "textureAsMask"  - when using color, use the (optional) texture alpha channel as mask.
		 * These can be combined, but they must be separated by a ":"
		 * so you can have a white overlay over an stretched grayscale image with:
		 * "grayscale:color:255 255 255 100:stretched:filename.ext"
		 */
		// Check that this can be a special sprite.
		if (SpriteName.ReverseFind(":") == -1 && SpriteName.Find("color(") == -1)
		{
			LOGERROR("Trying to use a sprite that doesn't exist (\"%s\").", SpriteName.c_str());
			return;
		}
		CGUISprite* Sprite = new CGUISprite;
		VfsPath TextureName = VfsPath("art/textures/ui") / wstring_from_utf8(SpriteName.AfterLast(":"));
		if (SpriteName.Find("stretched:") != -1)
		{
			// TODO: Should check (nicely) that this is a valid file?
			SGUIImage* Image = new SGUIImage;

			Image->m_TextureName = TextureName;
			// Allow grayscale images for disabled portraits
			if (SpriteName.Find("grayscale:") != -1)
			{
				Image->m_Effects = new SGUIImageEffects;
				Image->m_Effects->m_Greyscale = true;
			}

			CClientArea ca(CRect(0, 0, 0, 0), CRect(0, 0, 100, 100));
			Image->m_Size = ca;
			Image->m_TextureSize = ca;

			Sprite->AddImage(Image);

			Sprites[SpriteName] = Sprite;
		}
		else if (SpriteName.Find("cropped:") != -1)
		{
			// TODO: Should check (nicely) that this is a valid file?
			SGUIImage* Image = new SGUIImage;

			CStr info = SpriteName.AfterLast("cropped:").BeforeFirst(":");
			double xRatio = info.BeforeFirst(",").ToDouble();
			double yRatio = info.AfterLast(",").ToDouble();

			Image->m_TextureName = TextureName;

			CClientArea ca(CRect(0, 0, 0, 0), CRect(0, 0, 100, 100));
			CClientArea cb(CRect(0, 0, 0, 0), CRect(0, 0, 100/xRatio, 100/yRatio));
			Image->m_Size = ca;
			Image->m_TextureSize = cb;

			Sprite->AddImage(Image);

			Sprites[SpriteName] = Sprite;
		}
		if (SpriteName.Find("color:") != -1)
		{
			CStrW value = wstring_from_utf8(SpriteName.AfterLast("color:").BeforeFirst(":"));
			CColor color;

			// Check color is valid
			if (!GUI<CColor>::ParseString(value, color))
			{
				LOGERROR("GUI: Error parsing sprite 'color' (\"%s\")", utf8_from_wstring(value));
				return;
			}

			SGUIImage* Image = new SGUIImage;

			// If we are using a mask, this is an effect.
			// Otherwise we can fallback to the "back color" attribute
			// TODO: we are assuming there is a filename here.
			if (SpriteName.Find("textureAsMask:") != -1)
			{
				Image->m_TextureName = TextureName;
				Image->m_Effects = new SGUIImageEffects;
//.........这里部分代码省略.........