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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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 (at your option) 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*
*/
#include "common/file.h"
#include "draci/draci.h"
#include "draci/font.h"
namespace Draci {
DraciFont::DraciFont(Common::String &filename) :
_fontHeight(0), _maxCharWidth(0),
_charWidths(NULL), _charData(0) {
setFont(filename);
}
DraciFont::~DraciFont() {
freeFont();
}
/**
* @brief Loads fonts from a file
* @param path Path to font file
* @return true if the font was loaded successfully, false otherwise
*
* Loads fonts from a file into a DraciFont instance. The original game uses two
* fonts (located inside files "Small.fon" and "Big.fon"). The characters in the
* font are indexed from the ASCII space (decimal value 32) so an appropriate
* offset must be added to convert them to equivalent char values,
* i.e. kDraciIndexOffset.
*
* font format: [1 byte] maximum character width
* [1 byte] font height
* [138 bytes] character widths of all 138 characters in the font
* [138 * fontHeight * maxWidth bytes] character data, stored row-wise
*/
bool DraciFont::setFont(Common::String &filename) {
// If there is a font already loaded, free it
if (_charData) {
freeFont();
}
Common::File f;
f.open(filename);
if (f.isOpen()) {
debugC(6, kDraciGeneralDebugLevel, "Opened font file %s",
filename.c_str());
} else {
debugC(6, kDraciGeneralDebugLevel, "Error opening font file %s",
filename.c_str());
return false;
}
_maxCharWidth = f.readByte();
_fontHeight = f.readByte();
// Read in the widths of the glyphs
_charWidths = new uint8[kCharNum];
for (unsigned int i = 0; i < kCharNum; ++i) {
_charWidths[i] = f.readByte();
}
// Calculate size of font data
unsigned int fontDataSize = kCharNum * _maxCharWidth * _fontHeight;
// Read in all glyphs
_charData = new byte[fontDataSize];
f.read(_charData, fontDataSize);
debugC(5, kDraciGeneralDebugLevel, "Font %s loaded", filename.c_str());
return true;
}
void DraciFont::freeFont() {
delete[] _charWidths;
delete[] _charData;
}
uint8 DraciFont::getCharWidth(uint8 chr) const {
return _charWidths[chr - kCharIndexOffset];
}
/**
* @brief Draw a char to a Graphics::Surface
* @param dst Pointer to the destination surface
* @param chr Character to draw (ASCII value)
* @param tx Horizontal offset on the surface
* @param ty Vertical offset on the surface
*/
void DraciFont::drawChar(Graphics::Surface *dst, uint8 chr, int tx, int ty) const {
assert(dst != NULL);
byte *ptr = (byte *)dst->getBasePtr(tx, ty);
uint8 charIndex = chr - kCharIndexOffset;
int charOffset = charIndex * _fontHeight * _maxCharWidth;
uint8 currentWidth = _charWidths[charIndex];
for (uint8 y = 0; y < _fontHeight; ++y) {
// Check for vertical overflow
if (ty + y < 0 || ty + y >= dst->h) {
continue;
}
for (uint8 x = 0; x <= currentWidth; ++x) {
// Check for horizontal overflow
if (tx + x < 0 || tx + x >= dst->w) {
continue;
}
// Paint pixel
int curr = ((int)y) * _maxCharWidth + x;
ptr[x] = _charData[charOffset + curr];
}
// Advance to next row
ptr += dst->pitch;
}
}
/**
* @brief Draw a string to a Graphics::Surface
*
* @param dst Pointer to the destination surface
* @param str String to draw
* @param x Horizontal offset on the surface
* @param y Vertical offset on the surface
* @param spacing Space to leave between individual characters. Defaults to 0.
*/
void DraciFont::drawString(Graphics::Surface *dst, Common::String str,
int x, int y, int spacing) const {
assert(dst != NULL);
int curx = x;
uint len = str.size();
for (unsigned int i = 0; i < len; ++i) {
drawChar(dst, str[i], curx, y);
curx += getCharWidth(str[i]) + spacing;
}
}
/**
* @brief Calculate the width of a string when drawn in the current font
*
* @param str String to draw
* @param spacing Space to leave between individual characters. Defaults to 0.
*
* @return The calculated width of the string
*/
int DraciFont::getStringWidth(Common::String &str, int spacing) const {
int width = 0;
uint len = str.size();
for (unsigned int i = 0; i < len; ++i) {
uint8 charIndex = str[i] - kCharIndexOffset;
width += _charWidths[charIndex];
}
// Add width of spaces, if any
width += (len - 1) * spacing;
return width;
}
} // End of namespace Draci
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