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/*
* The Mana Client
* Copyright (C) 2004-2010 The Mana World Development Team
* Copyright (C) 2009 Aethyra Development Team
*
* This file is part of The Mana Client.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "gui/truetypefont.h"
#include "graphics.h"
#include "resources/image.h"
#include <guichan/exception.hpp>
#define CACHE_SIZE 256
class TextChunk
{
public:
TextChunk(const std::string &text, const gcn::Color &color) :
img(NULL), text(text), color(color)
{
}
~TextChunk()
{
delete img;
}
bool operator==(const TextChunk &chunk) const
{
return (chunk.text == text && chunk.color == color);
}
void generate(TTF_Font *font)
{
SDL_Color sdlCol;
sdlCol.b = color.b;
sdlCol.r = color.r;
sdlCol.g = color.g;
SDL_Surface *surface = TTF_RenderUTF8_Blended(
font, text.c_str(), sdlCol);
if (!surface)
{
throw "Rendering font to surface failed: " +
std::string(TTF_GetError());
}
img = Image::load(surface);
SDL_FreeSurface(surface);
}
Image *img;
std::string text;
gcn::Color color;
};
typedef std::list<TextChunk>::iterator CacheIterator;
static int fontCounter;
TrueTypeFont::TrueTypeFont(const std::string &filename, int size, int style)
{
if (fontCounter == 0 && TTF_Init() == -1)
{
throw GCN_EXCEPTION("Unable to initialize SDL_ttf: " +
std::string(TTF_GetError()));
}
++fontCounter;
mFont = TTF_OpenFont(filename.c_str(), size);
if (!mFont)
{
throw GCN_EXCEPTION("SDLTrueTypeFont::SDLTrueTypeFont: " +
std::string(TTF_GetError()));
}
TTF_SetFontStyle(mFont, style);
}
TrueTypeFont::~TrueTypeFont()
{
TTF_CloseFont(mFont);
--fontCounter;
if (fontCounter == 0)
{
TTF_Quit();
}
}
void TrueTypeFont::drawString(gcn::Graphics *graphics,
const std::string &text,
int x, int y)
{
if (text.empty())
return;
Graphics *g = dynamic_cast<Graphics *>(graphics);
if (!g)
{
throw "Not a valid graphics object!";
}
gcn::Color col = g->getColor();
const float alpha = col.a / 255.0f;
/* The alpha value is ignored at string generation so avoid caching the
* same text with different alpha values.
*/
col.a = 255;
TextChunk chunk(text, col);
bool found = false;
for (CacheIterator i = mCache.begin(); i != mCache.end(); ++i)
{
if (chunk == (*i))
{
// Raise priority: move it to front
mCache.splice(mCache.begin(), mCache, i);
found = true;
break;
}
}
// Surface not found
if (!found)
{
if (mCache.size() >= CACHE_SIZE)
{
mCache.pop_back();
}
mCache.push_front(chunk);
mCache.front().generate(mFont);
}
mCache.front().img->setAlpha(alpha);
g->drawImage(mCache.front().img, x, y);
}
int TrueTypeFont::getWidth(const std::string &text) const
{
for (CacheIterator i = mCache.begin(); i != mCache.end(); i++)
{
if (i->text == text)
{
// Raise priority: move it to front
// Assumption is that TTF::draw will be called next
mCache.splice(mCache.begin(), mCache, i);
return i->img->getWidth();
}
}
int w, h;
TTF_SizeUTF8(mFont, text.c_str(), &w, &h);
return w;
}
int TrueTypeFont::getHeight() const
{
return TTF_FontHeight(mFont);
}
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