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#include "glbase.h"
#include "glfont.h"
#include "Input.h"
Uint8 prescale2[4] = { 0, 85, 170, 255 }, prescale3[8] = { 0, 36, 72, 109, 145, 182, 218, 255 };
#define DEBUG 1
/*
font file format
================
off|siz|description
---+---+-------------------------------
0 | 2 | Number of entries = nbentries
2 | 1 | Flags
3 | 1 | maxX (maximum width)
4 | 1 | maxY (maximum height)
5 | X | char entries
5+X| Y | char map
X = (maxX * maxY + 1) * nbentries
Y = nbentries * 4
Flags:
=====
0000000R
R = RGBA (=1) or Alpha (=0)
RGBA in 1232 format:
ABBGGGRR
Each entries:
============
off|siz|description
---+---+-------------------------------
0 | 1 | True size of the entry
1 | Z | Datas
Z = maxX * maxY
Datas are stored in order X first, then Y.
Char map:
========
nbentries entries, each entry = 4 bytes = 2 uint16
off|siz|description
---+---+-------------------------------
0 | 2 | Unicode (?)
2 | 2 | Corresponding char entry
I'm not sure about my word 'Unicode'. I write this only to say it's an attempt
to make the fonts "internationals". If the "unicode" is < 255, then it should
match only one byte in the string. Otherwise, it should match two bytes.
Variables comments
==================
nbcU = number of chars on X by texture
nbcV = number of chars on Y by texture
nbcT = number of char by texture
nbT = number of textures
*/
mogltk::font::font(Handle * ffont) {
int i;
ffont->SetZ();
ffont->read(&nbentries, 2);
ffont->read(&flags, 1);
ffont->read(&maxX, 1);
ffont->read(&maxY, 1);
nbcU = 256 / maxX;
nbcV = 256 / maxY;
nbcT = nbcU * nbcV;
nbT = nbentries / nbcT;
if (nbentries % nbcT) {
nbT++;
}
#ifdef DEBUG
printm(M_INFO, "Creating font texture: %i entries, flags = 0x%02x, maxX = %i, maxY = %i\n", nbentries, flags, maxX, maxY);
printm(M_INFO, "Which makes %i texture(s), with %i char by texture, %i on X, and %i on Y\n", nbT, nbcT, nbcU, nbcV);
#endif
fonttex = (texture **) malloc(nbT * sizeof(texture *));
for (i = 0; i < nbT; i++) {
fonttex[i] = new texture(256, 256, true);
}
sizes = (Uint8 *) malloc(nbentries * sizeof(Uint8));
Uint8 * curtex = (Uint8 *) fonttex[0]->GetSurface()->pixels;
Uint32 curU = 0, curV = 0, curT = 0;
for (int i = 0; i < nbentries; i++) {
ffont->read(&sizes[i], 1);
for (int v = 0; v < maxY; v++) {
for (int u = 0; u < maxX; u++) {
Uint8 f;
ffont->read(&f, 1);
if (flags & 1) {
Uint8 r, g, b, a;
r = f & 3;
g = (f >> 2) & 7;
b = (f >> 5) & 3;
a = (f >> 7) & 1;
curtex[(curU + u + (curV + v) * 256) * 4 + 0] = prescale2[r];
curtex[(curU + u + (curV + v) * 256) * 4 + 1] = prescale3[g];
curtex[(curU + u + (curV + v) * 256) * 4 + 2] = prescale2[b];
curtex[(curU + u + (curV + v) * 256) * 4 + 3] = a ? 255 : 0;
} else {
curtex[(curU + u + (curV + v) * 256) * 4 + 0] = 255;
curtex[(curU + u + (curV + v) * 256) * 4 + 1] = 255;
curtex[(curU + u + (curV + v) * 256) * 4 + 2] = 255;
curtex[(curU + u + (curV + v) * 256) * 4 + 3] = f;
}
}
}
if ((curU += maxX) >= 256) {
curU = 0;
if ((curV += maxY) >= 256) {
curV = 0;
if ((curT + 1) != nbT)
curtex = (Uint8 *) fonttex[++curT]->GetSurface()->pixels;
}
}
}
corresp = (Uint16 *) malloc(nbentries * 2 * sizeof(Uint16));
ffont->read(corresp, 2 * sizeof(Uint16) * nbentries);
}
mogltk::font::~font() {
int i;
for (i = 0; i < nbT; i++) {
delete fonttex[i];
}
free((void *) fonttex);
free(sizes);
}
void mogltk::font::drawentry(Uint16 entry, int x, int y, Color c) {
bool was2D;
int trueentry, cx, cy, px, py;
was2D = mogltk::glbase::is2D();
if (!was2D) {
mogltk::glbase::Enter2DMode();
}
Bind(entry / nbcT);
c.Bind();
trueentry = entry % nbcT;
cx = trueentry % nbcU;
cy = trueentry / nbcU;
px = cx * maxX;
py = cy * maxY;
glBegin(GL_TRIANGLE_STRIP);
glTexCoord2i(px , py ); glVertex2i(x , y );
glTexCoord2i(px + maxX - 1, py ); glVertex2i(x + maxX - 1, y );
glTexCoord2i(px , py + maxY - 1); glVertex2i(x , y + maxY - 1);
glTexCoord2i(px + maxX - 1, py + maxY - 1); glVertex2i(x + maxX - 1, y + maxY - 1);
glEnd();
if (!was2D) {
mogltk::glbase::Leave2DMode();
}
}
void mogltk::font::Bind(int index) {
fonttex[index]->Bind();
}
void mogltk::font::putcursor(int x, int y) {
cx = ox = x;
cy = y;
}
void mogltk::font::putentry(Uint16 entry, Color c) {
drawentry(entry, cx, cy, c);
cx += sizes[entry];
}
void mogltk::font::newline(void) {
cx = ox;
cy += maxY;
}
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