430 lines
10 KiB
C++
430 lines
10 KiB
C++
// texturefont.cpp
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//
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// Copyright (C) 2001, Chris Laurel <claurel@shatters.net>
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 2
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// of the License, or (at your option) any later version.
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#include <cassert>
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#include <cstring>
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#include <fstream>
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#ifndef _WIN32
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#include "config.h"
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#endif
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#include "celutil/debug.h"
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#include "celutil/bytes.h"
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#include "celengine/gl.h"
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#include "texturefont.h"
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using namespace std;
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TextureFont::TextureFont() :
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maxAscent(0),
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maxDescent(0),
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maxWidth(0),
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texWidth(0),
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texHeight(0),
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fontImage(NULL),
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texName(0),
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glyphLookup(NULL),
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glyphLookupTableSize(0)
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{
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}
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TextureFont::~TextureFont()
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{
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if (texName != 0)
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glDeleteTextures(1, &texName);
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if (fontImage != NULL)
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delete[] fontImage;
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if (glyphLookup != NULL)
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delete[] glyphLookup;
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}
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void TextureFont::render(int c) const
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{
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const Glyph* glyph = getGlyph(c);
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if (glyph != NULL)
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{
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glBegin(GL_QUADS);
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glTexCoord2f(glyph->texCoords[0].u, glyph->texCoords[0].v);
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glVertex2f(glyph->xoff, glyph->yoff);
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glTexCoord2f(glyph->texCoords[1].u, glyph->texCoords[1].v);
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glVertex2f(glyph->xoff + glyph->width, glyph->yoff);
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glTexCoord2f(glyph->texCoords[2].u, glyph->texCoords[2].v);
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glVertex2f(glyph->xoff + glyph->width, glyph->yoff + glyph->height);
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glTexCoord2f(glyph->texCoords[3].u, glyph->texCoords[3].v);
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glVertex2f(glyph->xoff, glyph->yoff + glyph->height);
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glEnd();
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glTranslatef(glyph->advance, 0.0f, 0.0f);
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}
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}
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void TextureFont::render(const string& s) const
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{
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int len = s.length();
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for (int i = 0; i < len; i++)
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render(s[i]);
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}
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int TextureFont::getWidth(const string& s) const
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{
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int width = 0;
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int len = s.length();
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for (int i = 0; i < len; i++)
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{
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const Glyph* g = getGlyph(s[i]);
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if (g != NULL)
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width += g->advance;
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}
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return width;
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}
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int TextureFont::getHeight() const
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{
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return maxAscent + maxDescent;
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}
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int TextureFont::getMaxWidth() const
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{
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return maxWidth;
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}
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int TextureFont::getMaxAscent() const
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{
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return maxAscent;
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}
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void TextureFont::setMaxAscent(int _maxAscent)
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{
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maxAscent = _maxAscent;
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}
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int TextureFont::getMaxDescent() const
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{
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return maxDescent;
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}
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void TextureFont::setMaxDescent(int _maxDescent)
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{
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maxDescent = _maxDescent;
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}
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int TextureFont::getTextureName() const
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{
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return texName;
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}
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void TextureFont::bind()
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{
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if (texName != 0)
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glBindTexture(GL_TEXTURE_2D, texName);
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}
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void TextureFont::addGlyph(const TextureFont::Glyph& g)
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{
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glyphs.insert(glyphs.end(), g);
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if (g.width > maxWidth)
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maxWidth = g.width;
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}
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const TextureFont::Glyph* TextureFont::getGlyph(int c) const
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{
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if (c < 0 || c >= glyphLookupTableSize)
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return NULL;
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else
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return glyphLookup[c];
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}
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bool TextureFont::buildTexture()
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{
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assert(fontImage != NULL);
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if (texName != 0)
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glDeleteTextures(1, &texName);
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glGenTextures(1, &texName);
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if (texName == 0)
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{
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DPRINTF("Failed to allocate texture object for font.\n");
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return false;
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}
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glBindTexture(GL_TEXTURE_2D, texName);
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// Don't build mipmaps . . . should really make them an option.
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA,
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texWidth, texHeight,
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0,
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GL_ALPHA, GL_UNSIGNED_BYTE,
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fontImage);
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return true;
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}
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void TextureFont::rebuildGlyphLookupTable()
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{
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if (glyphs.size() == 0)
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return;
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// Find the largest glyph id
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int maxID = glyphs[0].id;
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vector<Glyph>::const_iterator iter;
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for (iter = glyphs.begin(); iter != glyphs.end(); iter++)
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{
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if (iter->id > maxID)
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maxID = iter->id;
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}
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// If there was already a lookup table, delete it.
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if (glyphLookup != NULL)
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delete[] glyphLookup;
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DPRINTF("texturefont: allocating glyph lookup table with %d entries.\n",
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maxID + 1);
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glyphLookup = new const Glyph*[maxID + 1];
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for (int i = 0; i <= maxID; i++)
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glyphLookup[i] = NULL;
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// Fill the table with glyph pointers
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for (iter = glyphs.begin(); iter != glyphs.end(); iter++)
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glyphLookup[iter->id] = iter;
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glyphLookupTableSize = maxID + 1;
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}
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static uint32 readUint32(istream& in, bool swap)
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{
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uint32 x;
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in.read(reinterpret_cast<char*>(&x), sizeof x);
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return swap ? bswap_32(x) : x;
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}
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static uint16 readUint16(istream& in, bool swap)
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{
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uint16 x;
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in.read(reinterpret_cast<char*>(&x), sizeof x);
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return swap ? bswap_16(x) : x;
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}
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static uint8 readUint8(istream& in)
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{
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uint8 x;
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in.read(reinterpret_cast<char*>(&x), sizeof x);
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return x;
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}
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/* Not currently used
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static int32 readInt32(istream& in, bool swap)
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{
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int32 x;
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in.read(reinterpret_cast<char*>(&x), sizeof x);
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return swap ? static_cast<int32>(bswap_32(static_cast<uint32>(x))) : x;
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}*/
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static int16 readInt16(istream& in, bool swap)
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{
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int16 x;
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in.read(reinterpret_cast<char*>(&x), sizeof x);
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return swap ? static_cast<int16>(bswap_16(static_cast<uint16>(x))) : x;
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}
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static int8 readInt8(istream& in)
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{
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int8 x;
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in.read(reinterpret_cast<char*>(&x), sizeof x);
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return x;
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}
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TextureFont* TextureFont::load(istream& in)
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{
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char header[4];
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in.read(header, sizeof header);
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if (!in.good() || strncmp(header, "\377txf", 4) != 0)
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{
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DPRINTF("Stream is not a texture font!.\n");
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return NULL;
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}
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uint32 endiannessTest = 0;
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in.read(reinterpret_cast<char*>(&endiannessTest), sizeof endiannessTest);
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if (!in.good())
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{
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DPRINTF("Error reading endianness bytes in txf header.\n");
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return NULL;
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}
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bool byteSwap;
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if (endiannessTest == 0x78563412)
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byteSwap = true;
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else if (endiannessTest == 0x12345678)
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byteSwap = false;
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else
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{
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DPRINTF("Stream is not a texture font!.\n");
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return NULL;
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}
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int format = readUint32(in, byteSwap);
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unsigned int texWidth = readUint32(in, byteSwap);
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unsigned int texHeight = readUint32(in, byteSwap);
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unsigned int maxAscent = readUint32(in, byteSwap);
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unsigned int maxDescent = readUint32(in, byteSwap);
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unsigned int nGlyphs = readUint32(in, byteSwap);
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if (!in)
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{
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DPRINTF("Texture font stream is incomplete");
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return NULL;
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}
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DPRINTF("Font contains %d glyphs.\n", nGlyphs);
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TextureFont* font = new TextureFont();
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assert(font != NULL);
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font->setMaxAscent(maxAscent);
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font->setMaxDescent(maxDescent);
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float dx = 0.5f / texWidth;
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float dy = 0.5f / texHeight;
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for (unsigned int i = 0; i < nGlyphs; i++)
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{
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uint16 id = readUint16(in, byteSwap);
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TextureFont::Glyph glyph(id);
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glyph.width = readUint8(in);
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glyph.height = readUint8(in);
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glyph.xoff = readInt8(in);
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glyph.yoff = readInt8(in);
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glyph.advance = readInt8(in);
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readInt8(in);
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glyph.x = readInt16(in, byteSwap);
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glyph.y = readInt16(in, byteSwap);
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if (!in)
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{
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DPRINTF("Error reading glyph %ud from texture font stream.\n", i);
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delete font;
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return NULL;
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}
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float fWidth = texWidth;
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float fHeight = texHeight;
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glyph.texCoords[0].u = glyph.x / fWidth + dx;
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glyph.texCoords[0].v = glyph.y / fHeight + dy;
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glyph.texCoords[1].u = (glyph.x + glyph.width) / fWidth + dx;
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glyph.texCoords[1].v = glyph.y / fHeight + dy;
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glyph.texCoords[2].u = (glyph.x + glyph.width) / fWidth + dx;
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glyph.texCoords[2].v = (glyph.y + glyph.height) / fHeight + dy;
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glyph.texCoords[3].u = glyph.x / fWidth + dx;
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glyph.texCoords[3].v = (glyph.y + glyph.height) / fHeight + dy;
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font->addGlyph(glyph);
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}
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font->texWidth = texWidth;
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font->texHeight = texHeight;
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if (format == TxfByte)
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{
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unsigned char* fontImage = new unsigned char[texWidth * texHeight];
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if (fontImage == NULL)
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{
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DPRINTF("Not enough memory for font bitmap.\n");
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delete font;
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return NULL;
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}
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DPRINTF("Reading %d x %d 8-bit font image.\n", texWidth, texHeight);
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in.read(reinterpret_cast<char*>(fontImage), texWidth * texHeight);
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if (in.fail())
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{
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DPRINTF("Missing bitmap data in font stream.\n");
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delete font;
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delete[] fontImage;
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return NULL;
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}
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font->fontImage = fontImage;
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}
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else
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{
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int rowBytes = (texWidth + 7) >> 3;
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unsigned char* fontBits = new unsigned char[rowBytes * texHeight];
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unsigned char* fontImage = new unsigned char[texWidth * texHeight];
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if (fontImage == NULL || fontBits == NULL)
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{
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DPRINTF("Not enough memory for font bitmap.\n");
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delete font;
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if (fontBits != NULL)
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delete[] fontBits;
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if (fontImage != NULL)
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delete[] fontImage;
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return NULL;
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}
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DPRINTF("Reading %d x %d 1-bit font image.\n", texWidth, texHeight);
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in.read(reinterpret_cast<char*>(fontBits), rowBytes * texHeight);
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if (in.fail())
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{
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DPRINTF("Missing bitmap data in font stream.\n");
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delete font;
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return NULL;
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}
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for (unsigned int y = 0; y < texHeight; y++)
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{
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for (unsigned int x = 0; x < texWidth; x++)
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{
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if ((fontBits[y * rowBytes + (x >> 3)] & (1 << (x & 0x7))) != 0)
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fontImage[y * texWidth + x] = 0xff;
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else
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fontImage[y * texWidth + x] = 0x0;
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}
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}
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font->fontImage = fontImage;
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delete[] fontBits;
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}
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font->rebuildGlyphLookupTable();
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return font;
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}
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TextureFont* LoadTextureFont(const string& filename)
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{
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ifstream in(filename.c_str(), ios::in | ios::binary);
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if (!in.good())
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{
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DPRINTF("Could not open font file %s\n", filename.c_str());
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return NULL;
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}
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return TextureFont::load(in);
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}
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