sdlterm/src/sdlterm.cc
author Radek Brich <radek.brich@devl.cz>
Sat, 05 Jan 2013 12:40:32 +0100
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parent 47 537d7c6b48a2
child 49 1611c462c3e3
permissions -rw-r--r--
Add SDL driver prototype. Update sdlterm: Handle keyboard, mouse events. Add glyph cache.
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#include "sdlterm.h"
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#include <stdexcept>
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SDL_Surface *GlyphCache::lookup_glyph(Uint16 ch)
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{
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	auto iter = _glyph_map.find(ch);
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	if (iter == _glyph_map.end())
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	{
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		return NULL;
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	}
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	return iter->second;
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}
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void GlyphCache::put_glyph(Uint16 ch, SDL_Surface *srf)
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{
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	_glyph_map[ch] = srf;
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}
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void GlyphCache::flush()
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{
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	for (auto iter = _glyph_map.begin(); iter != _glyph_map.end(); iter++)
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	{
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		SDL_FreeSurface(iter->second);
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	}
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	_glyph_map.clear();
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}
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GlyphRenderer::GlyphRenderer()
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 : _font_regular(NULL), _font_bold(NULL)
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{
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	if (TTF_Init() == -1)
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	{
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	    printf("TTF_Init: %s\n", TTF_GetError());
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	    throw std::exception();
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	}
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}
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GlyphRenderer::~GlyphRenderer()
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{
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	_cache.flush();
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	close_font();
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	TTF_Quit();
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}
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void GlyphRenderer::open_font(const char *fname_regular, const char *fname_bold, int ptsize)
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{
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	close_font();
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	// open regular font
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	_font_regular = TTF_OpenFont(fname_regular, ptsize);
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	if (!_font_regular)
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	{
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		printf("TTF_OpenFont: %s\n", TTF_GetError());
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		throw std::exception();
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	}
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	// open bold font
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	_font_bold = TTF_OpenFont(fname_bold, ptsize);
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	if (!_font_bold)
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	{
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		printf("TTF_OpenFont: %s\n", TTF_GetError());
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		throw std::exception();
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	}
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	// update metrics for regular font
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	int advance;
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	if (TTF_GlyphMetrics(_font_regular, 'M', NULL, NULL, NULL, NULL, &advance) == -1)
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	{
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	    printf("TTF_GlyphMetrics: %s\n", TTF_GetError());
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	}
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	_cell_width = advance;
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	_cell_height = TTF_FontHeight(_font_regular);
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	// read metrics for bold font
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	if (TTF_GlyphMetrics(_font_bold, 'M', NULL, NULL, NULL, NULL, &advance) == -1)
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	{
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		printf("TTF_GlyphMetrics: %s\n", TTF_GetError());
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	}
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	if (advance > _cell_width)
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	{
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		_cell_width = advance;
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	}
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	int height = TTF_FontHeight(_font_bold);
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	if (height > _cell_height)
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	{
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		_cell_height = height;
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	}
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}
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void GlyphRenderer::close_font()
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{
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	if (_font_regular)
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	{
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		TTF_CloseFont(_font_regular);
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		_font_regular = NULL;
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	}
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	if (_font_bold)
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	{
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		TTF_CloseFont(_font_bold);
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		_font_bold = NULL;
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	}
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}
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SDL_Surface *GlyphRenderer::render_glyph(Uint16 ch)
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{
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	SDL_Surface *cell_surface;
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	// try cache
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	cell_surface = _cache.lookup_glyph(ch);
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	if (cell_surface)
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	{
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		return cell_surface;
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	}
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	TTF_Font *font = _font_regular;
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	SDL_Color color={0xff,0xff,0xff}, bgcolor={0,100,100};
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	if (ch != 'W')
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	{
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		bgcolor.g = 0;
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		bgcolor.b = 0;
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	}
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	// create surface for whole cell and fill it with bg color
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	cell_surface = SDL_CreateRGBSurface(SDL_SWSURFACE,
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			_cell_width, _cell_height, 32, 0, 0, 0, 0);
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	SDL_Rect dst_rect;
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	dst_rect.x = 0;
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	dst_rect.y = 0;
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	dst_rect.w = _cell_width;
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	dst_rect.h = _cell_height;
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	Uint32 bgcolor_mapped = SDL_MapRGB(cell_surface->format, bgcolor.r, bgcolor.g, bgcolor.b);
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	SDL_FillRect(cell_surface, &dst_rect, bgcolor_mapped);
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	// render glyph, blit it onto cell surface
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	SDL_Surface *glyph_surface = TTF_RenderGlyph_Shaded(font, ch, color, bgcolor);
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	int minx, maxy;
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	TTF_GlyphMetrics(font, ch, &minx, NULL, NULL, &maxy, NULL);
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	dst_rect.x = minx;
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	dst_rect.y = TTF_FontAscent(font) - maxy;
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	SDL_BlitSurface(glyph_surface, NULL, cell_surface, &dst_rect);
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	SDL_FreeSurface(glyph_surface);
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	_cache.put_glyph(ch, cell_surface);
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	return cell_surface;
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}
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TerminalScreen::~TerminalScreen()
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{
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	if (_cells)
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	{
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		delete[] _cells;
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	}
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}
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void TerminalScreen::select_font(const char *fname_regular, const char *fname_bold, int ptsize)
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{
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	_render.open_font(fname_regular, fname_bold, ptsize);
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	_reset_cells();
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}
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void TerminalScreen::resize(int pxwidth, int pxheight)
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{
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    _screen_surface = SDL_SetVideoMode(pxwidth, pxheight, 32, SDL_HWSURFACE|SDL_RESIZABLE);
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    if (_screen_surface == NULL)
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    {
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		fprintf(stderr, "Unable to set video: %s\n", SDL_GetError());
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		throw std::exception();
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    }
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    SDL_WM_SetCaption("terminal", NULL);
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    _pixel_width = pxwidth;
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    _pixel_height = pxheight;
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    _reset_cells();
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}
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void TerminalScreen::erase()
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{
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	TerminalCell * cell = _cells;
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	for (int i = 0; i < _width * _height; i++)
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	{
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		cell->ch = ' ';
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		cell->attr = 0;
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		cell++;
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	}
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}
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void TerminalScreen::putch(int x, int y, Uint16 ch, Uint16 attr)
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{
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	TerminalCell &cell = _cells[y * _width + x];
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	cell.ch = ch;
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	cell.attr = attr;
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}
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void TerminalScreen::commit()
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{
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	TerminalCell * cell = _cells;
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	SDL_Surface *glyph_surface;
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	SDL_Rect dst_rect;
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	for (int y = 0; y < _height; y++)
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	{
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		for (int x = 0; x < _width; x++)
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		{
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			dst_rect.x = x * _cell_width;
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			dst_rect.y = y * _cell_height;
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			glyph_surface = _render.render_glyph(cell->ch);
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			SDL_BlitSurface(glyph_surface, NULL, _screen_surface, &dst_rect);
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			cell++;
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		}
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	}
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	SDL_UpdateRect(_screen_surface, 0, 0, 0, 0);
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}
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void TerminalScreen::_reset_cells()
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{
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	if (_cells)
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	{
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		delete[] _cells;
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		_cells = NULL;
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	}
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	_cell_width = _render.get_cell_width();
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	_cell_height = _render.get_cell_height();
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	_width = _pixel_width / _cell_width;
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	_height = _pixel_height / _cell_height;
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	int num_cells = _width * _height;
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	_cells = new TerminalCell[num_cells];
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}
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Terminal::Terminal()
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 : _screen()
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{
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    if (SDL_Init(SDL_INIT_VIDEO) == -1)
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    {
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		fprintf(stderr, "Unable to initialize SDL: %s\n", SDL_GetError());
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		throw std::exception();
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    }
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    SDL_EnableUNICODE(1);
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}
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Terminal::~Terminal()
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{
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	SDL_Quit();
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}
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void Terminal::get_next_event(Event &event)
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{
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	SDL_Event sdl_event;
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	while (SDL_WaitEvent(&sdl_event))
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	{
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		switch (sdl_event.type)
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		{
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			case SDL_QUIT:
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				event.type = Event::QUIT;
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				return;
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			case SDL_KEYDOWN:
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				//switch(event.key.keysym.sym)
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				event.type = Event::KEYPRESS;
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				event.key.unicode = sdl_event.key.keysym.unicode;
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				strncpy(event.key.keyname, _translate_keyname(sdl_event.key.keysym.sym), 10);
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				return;
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			case SDL_MOUSEBUTTONDOWN:
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			case SDL_MOUSEBUTTONUP:
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				event.type = (sdl_event.type == SDL_MOUSEBUTTONDOWN) ? Event::MOUSEDOWN : Event::MOUSEUP;
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				event.mouse.x = sdl_event.button.x / _screen.get_cell_width();
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				event.mouse.y = sdl_event.button.y / _screen.get_cell_height();
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				event.mouse.button = sdl_event.button.button;
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				return;
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			case SDL_MOUSEMOTION:
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				event.type = Event::MOUSEMOVE;
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				event.mouse.x = sdl_event.motion.x / _screen.get_cell_width();
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				event.mouse.y = sdl_event.motion.y / _screen.get_cell_height();
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				return;
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			default:
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				break; // continue loop
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		}
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	}
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}
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const char *Terminal::_translate_keyname(SDLKey sym)
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{
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	switch (sym)
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	{
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		case SDLK_BACKSPACE: 	return "backspace";
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		case SDLK_TAB:			return "tab";
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		case SDLK_RETURN:		return "enter";
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		case SDLK_KP_ENTER:		return "enter";
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		case SDLK_PAUSE:	    return "pause";
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		case SDLK_ESCAPE:		return "escape";
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		case SDLK_DELETE:		return "delete";
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		case SDLK_INSERT:		return "insert";
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		case SDLK_UP:			return "up";
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		case SDLK_DOWN:			return "down";
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		case SDLK_LEFT:			return "left";
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		case SDLK_RIGHT:		return "right";
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		case SDLK_HOME:			return "home";
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		case SDLK_END:			return "end";
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		case SDLK_PAGEUP:		return "pageup";
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		case SDLK_PAGEDOWN:		return "pagedown";
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		case SDLK_F1:			return "f1";
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		case SDLK_F2:			return "f2";
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		case SDLK_F3:			return "f3";
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		case SDLK_F4:			return "f4";
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		case SDLK_F5:			return "f5";
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		case SDLK_F6:			return "f6";
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		case SDLK_F7:			return "f7";
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		case SDLK_F8:			return "f8";
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		case SDLK_F9:			return "f9";
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		case SDLK_F10:			return "f10";
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		case SDLK_F11:			return "f11";
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		case SDLK_F12:			return "f12";
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		default: return "";
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	}
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}
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