advtrains.git - Advtrains mod for minetest.

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/*
   CGUITTFont FreeType class for Irrlicht
   Copyright (c) 2009-2010 John Norman

   This software is provided 'as-is', without any express or implied
   warranty. In no event will the authors be held liable for any
   damages arising from the use of this software.

   Permission is granted to anyone to use this software for any
   purpose, including commercial applications, and to alter it and
   redistribute it freely, subject to the following restrictions:

   1. The origin of this software must not be misrepresented; you
      must not claim that you wrote the original software. If you use
      this software in a product, an acknowledgment in the product
      documentation would be appreciated but is not required.

   2. Altered source versions must be plainly marked as such, and
      must not be misrepresented as being the original software.

   3. This notice may not be removed or altered from any source
      distribution.

   The original version of this class can be located at:
   http://irrlicht.suckerfreegames.com/

   John Norman
   john@suckerfreegames.com
*/

#ifndef __C_GUI_TTFONT_H_INCLUDED__
#define __C_GUI_TTFONT_H_INCLUDED__

#include <irrlicht.h>
#include <ft2build.h>
#include FT_FREETYPE_H

namespace irr
{
namespace gui
{
	struct SGUITTFace;
	class CGUITTFont;

	//! Class to assist in deleting glyphs.
	class CGUITTAssistDelete
	{
		public:
			template <class T, typename TAlloc>
			static void Delete(core::array<T, TAlloc>& a)
			{
				TAlloc allocator;
				allocator.deallocate(a.pointer());
			}
	};

	//! Structure representing a single TrueType glyph.
	struct SGUITTGlyph
	{
		//! Constructor.
		SGUITTGlyph() : isLoaded(false), glyph_page(0), surface(0), parent(0) {}

		//! Destructor.
		~SGUITTGlyph() { unload(); }

		//! Preload the glyph.
		//!	The preload process occurs when the program tries to cache the glyph from FT_Library.
		//! However, it simply defines the SGUITTGlyph's properties and will only create the page
		//! textures if necessary.  The actual creation of the textures should only occur right
		//! before the batch draw call.
		void preload(u32 char_index, FT_Face face, video::IVideoDriver* driver, u32 font_size, const FT_Int32 loadFlags);

		//! Unloads the glyph.
		void unload();

		//! Creates the IImage object from the FT_Bitmap.
		video::IImage* createGlyphImage(const FT_Bitmap& bits, video::IVideoDriver* driver) const;

		//! If true, the glyph has been loaded.
		bool isLoaded;

		//! The page the glyph is on.
		u32 glyph_page;

		//! The source rectangle for the glyph.
		core::recti source_rect;

		//! The offset of glyph when drawn.
		core::vector2di offset;

		//! Glyph advance information.
		FT_Vector advance;

		//! This is just the temporary image holder.  After this glyph is paged,
		//! it will be dropped.
		mutable video::IImage* surface;

		//! The pointer pointing to the parent (CGUITTFont)
		CGUITTFont* parent;
	};

	//! Holds a sheet of glyphs.
	class CGUITTGlyphPage
	{
		public:
			CGUITTGlyphPage(video::IVideoDriver* Driver, const io::path& texture_name) :texture(0), available_slots(0), used_slots(0), dirty(false), driver(Driver), name(texture_name) {}
			~CGUITTGlyphPage()
			{
				if (texture)
				{
					if (driver)
						driver->removeTexture(texture);
					else texture->drop();
				}
			}

			//! Create the actual page texture,
			bool createPageTexture(const u8& pixel_mode, const core::dimension2du& texture_size)
			{
				if( texture )
					return false;

				bool flgmip = driver->getTextureCreationFlag(video::ETCF_CREATE_MIP_MAPS);
				driver->setTextureCreationFlag(video::ETCF_CREATE_MIP_MAPS, false);

				// Set the texture color format.
				switch (pixel_mode)
				{
					case FT_PIXEL_MODE_MONO:
						texture = driver->addTexture(texture_size, name, video::ECF_A1R5G5B5);
						break;
					case FT_PIXEL_MODE_GRAY:
					default:
						texture = driver->addTexture(texture_size, name, video::ECF_A8R8G8B8);
						break;
				}

				// Restore our texture creation flags.
				driver->setTextureCreationFlag(video::ETCF_CREATE_MIP_MAPS, flgmip);
				return texture ? true : false;
			}

			//! Add the glyph to a list of glyphs to be paged.
			//! This collection will be cleared after updateTexture is called.
			void pushGlyphToBePaged(const SGUITTGlyph* glyph)
			{
				glyph_to_be_paged.push_back(glyph);
			}

			//! Updates the texture atlas with new glyphs.
			void updateTexture()
			{
				if (!dirty) return;

				void* ptr = texture->lock();
				video::ECOLOR_FORMAT format = texture->getColorFormat();
				core::dimension2du size = texture->getOriginalSize();
				video::IImage* pageholder = driver->createImageFromData(format, size, ptr, true, false);

				for (u32 i = 0; i < glyph_to_be_paged.size(); ++i)
				{
					const SGUITTGlyph* glyph = glyph_to_be_paged[i];
					if (glyph && glyph->isLoaded)
					{
						if (glyph->surface)
						{
							glyph->surface->copyTo(pageholder, glyph->source_rect.UpperLeftCorner);
							glyph->surface->drop();
							glyph->surface = 0;
						}
						else
						{
							; // TODO: add error message?
							//currently, if we failed to create the image, just ignore this operation.
						}
					}
				}

				pageholder->drop();
				texture->unlock();
				glyph_to_be_paged.clear();
				dirty = false;
			}

			video::ITexture* texture;
			u32 available_slots;
			u32 used_slots;
			bool dirty;

			core::array<core::vector2di> render_positions;
			core::array<core::recti> render_source_rects;

		private:
			core::array<const SGUITTGlyph*> glyph_to_be_paged;
			video::IVideoDriver* driver;
			io::path name;
	};

	//! Class representing a TrueType font.
	class CGUITTFont : public IGUIFont


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