forked from bartvdbraak/blender
304 lines
8.5 KiB
C++
304 lines
8.5 KiB
C++
/*
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* bmfont.c
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*
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* 04-10-2000 frank
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*
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* $Id$
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*
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* ***** BEGIN GPL LICENSE BLOCK *****
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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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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
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* All rights reserved.
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*
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* The Original Code is: all of this file.
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*
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* Contributor(s): none yet.
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*
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* ***** END GPL LICENSE BLOCK *****
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*
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*/
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/** \file gameengine/GamePlayer/common/bmfont.cpp
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* \ingroup player
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*/
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/**
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* Two external functions:
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*
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* void detectBitmapFont(ImBuf *ibuf)
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* detects if an image buffer contains a bitmap font. It makes the
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* specific bitmap data which is stored in the bitmap invisible to blender.
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*
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* void matrixGlyph(ImBuf * ibuf, unsigned short unicode, *float x 7)
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* returns all the information about the character (unicode) in the floats
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*
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* Room for improvement:
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* add kerning data in the bitmap
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* all calculations in matrixGlyph() are static and could be done during
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* initialization
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*/
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#include <stdio.h>
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#include "MEM_guardedalloc.h"
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#include "BLI_blenlib.h"
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#include "BKE_global.h"
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#include "IMB_imbuf_types.h"
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#include "BKE_bmfont.h"
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#include "BKE_bmfont_types.h"
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/*MAART:
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void printfGlyph(bmGlyph * glyph)
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{
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printf("unicode: %d '%c'\n", glyph->unicode, glyph->unicode);
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printf(" locx: %4d locy: %4d\n", glyph->locx, glyph->locy);
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printf(" sizex: %3d sizey: %3d\n", glyph->sizex, glyph->sizey);
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printf(" ofsx: %3d ofsy: %3d\n", glyph->ofsx, glyph->ofsy);
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printf(" advan: %3d reser: %3d\n", glyph->advance, glyph->reserved);
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}
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*/
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#define MAX2(x,y) ( (x)>(y) ? (x) : (y) )
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#define MAX3(x,y,z) MAX2( MAX2((x),(y)) , (z) )
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void calcAlpha(ImBuf * ibuf)
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{
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int i;
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char * rect;
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if (ibuf) {
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rect = (char *) ibuf->rect;
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for (i = ibuf->x * ibuf->y ; i > 0 ; i--) {
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rect[3] = MAX3(rect[0], rect[1], rect[2]);
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rect += 4;
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}
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}
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}
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void readBitmapFontVersion0(ImBuf * ibuf, unsigned char * rect, int step)
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{
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int glyphcount, bytes, i, index, linelength, ysize;
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unsigned char * buffer;
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bmFont * bmfont;
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linelength = ibuf->x * step;
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glyphcount = (rect[6 * step] << 8) | rect[7 * step];
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bytes = ((glyphcount - 1) * sizeof(bmGlyph)) + sizeof(bmFont);
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ysize = (bytes + (ibuf->x - 1)) / ibuf->x;
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if (ysize < ibuf->y) {
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// we're first going to copy all data into a liniar buffer.
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// step can be 4 or 1 bytes, and the data is not sequential because
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// the bitmap was flipped vertically.
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buffer = (unsigned char*)MEM_mallocN(bytes, "readBitmapFontVersion0:buffer");
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index = 0;
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for (i = 0; i < bytes; i++) {
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buffer[i] = rect[index];
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index += step;
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if (index >= linelength) {
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// we've read one line, no skip to the line *before* that
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rect -= linelength;
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index -= linelength;
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}
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}
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// we're now going to endian convert the data
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bmfont = (bmFont*)MEM_mallocN(bytes, "readBitmapFontVersion0:bmfont");
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index = 0;
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// first read the header
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bmfont->magic[0] = buffer[index++];
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bmfont->magic[1] = buffer[index++];
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bmfont->magic[2] = buffer[index++];
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bmfont->magic[3] = buffer[index++];
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bmfont->version = (buffer[index] << 8) | buffer[index + 1]; index += 2;
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bmfont->glyphcount = (buffer[index] << 8) | buffer[index + 1]; index += 2;
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bmfont->xsize = (buffer[index] << 8) | buffer[index + 1]; index += 2;
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bmfont->ysize = (buffer[index] << 8) | buffer[index + 1]; index += 2;
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for (i = 0; i < bmfont->glyphcount; i++) {
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bmfont->glyphs[i].unicode = (buffer[index] << 8) | buffer[index + 1]; index += 2;
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bmfont->glyphs[i].locx = (buffer[index] << 8) | buffer[index + 1]; index += 2;
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bmfont->glyphs[i].locy = (buffer[index] << 8) | buffer[index + 1]; index += 2;
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bmfont->glyphs[i].ofsx = buffer[index++];
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bmfont->glyphs[i].ofsy = buffer[index++];
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bmfont->glyphs[i].sizex = buffer[index++];
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bmfont->glyphs[i].sizey = buffer[index++];
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bmfont->glyphs[i].advance = buffer[index++];
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bmfont->glyphs[i].reserved = buffer[index++];
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/* MAART:
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if (G.f & G_DEBUG) {
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printfGlyph(&bmfont->glyphs[i]);
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}
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*/
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}
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MEM_freeN(buffer);
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/* MAART:
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if (G.f & G_DEBUG) {
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printf("Oldy = %d Newy = %d\n", ibuf->y, ibuf->y - ysize);
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printf("glyphcount = %d\n", glyphcount);
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printf("bytes = %d\n", bytes);
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}
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*/
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// we've read the data from the image. Now we're going
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// to crop the image vertically so only the bitmap data
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// remains visible
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ibuf->y -= ysize;
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ibuf->userdata = bmfont;
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ibuf->userflags |= IB_BITMAPFONT;
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if (ibuf->depth < 32) {
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// we're going to fake alpha here:
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calcAlpha(ibuf);
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}
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} else {
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/* MAART:
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printf("readBitmapFontVersion0: corrupted bitmapfont\n");
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*/
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}
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}
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void detectBitmapFont(ImBuf *ibuf)
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{
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unsigned char * rect;
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unsigned short version;
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long i;
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if (ibuf != NULL) {
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// bitmap must have an x size that is a power of two
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if (is_power_of_two(ibuf->x)) {
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rect = (unsigned char *) (ibuf->rect + (ibuf->x * (ibuf->y - 1)));
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// printf ("starts with: %s %c %c %c %c\n", rect, rect[0], rect[1], rect[2], rect[3]);
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if (rect[0] == 'B' && rect[1] == 'F' && rect[2] == 'N' && rect[3] == 'T') {
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// printf("found 8bit font !\n");
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// round y size down
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// do the 8 bit font stuff. (not yet)
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} else {
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// we try all 4 possible combinations
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for (i = 0; i < 4; i++) {
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if (rect[0] == 'B' && rect[4] == 'F' && rect[8] == 'N' && rect[12] == 'T') {
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// printf("found 24bit font !\n");
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// We're going to parse the file:
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version = (rect[16] << 8) | rect[20];
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if (version == 0) {
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readBitmapFontVersion0(ibuf, rect, 4);
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} else {
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//printf("detectBitmapFont :Unsupported version %d\n", version);
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}
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// on succes ibuf->userdata points to the bitmapfont
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if (ibuf->userdata) {
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break;
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}
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}
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rect++;
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}
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}
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}
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}
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}
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int locateGlyph(bmFont *bmfont, unsigned short unicode)
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{
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int min, max, current = 0;
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if (bmfont) {
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min = 0;
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max = bmfont->glyphcount;
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while (1) {
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// look halfway for glyph
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current = (min + max) >> 1;
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if (bmfont->glyphs[current].unicode == unicode) {
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break;
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} else if (bmfont->glyphs[current].unicode < unicode) {
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// have to move up
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min = current;
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} else {
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// have to move down
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max = current;
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}
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if (max - min <= 1) {
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// unable to locate glyph
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current = 0;
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break;
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}
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}
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}
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return(current);
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}
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void matrixGlyph(ImBuf * ibuf, unsigned short unicode,
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float *centerx, float *centery,
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float *sizex, float *sizey,
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float *transx, float *transy,
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float *movex, float *movey,
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float *advance)
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{
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int index;
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bmFont *bmfont;
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*centerx = *centery = 0.0;
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*sizex = *sizey = 1.0;
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*transx = *transy = 0.0;
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*movex = *movey = 0.0;
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*advance = 1.0;
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if (ibuf) {
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bmfont = (bmFont*)ibuf->userdata;
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if (bmfont && (ibuf->userflags & IB_BITMAPFONT)) {
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index = locateGlyph(bmfont, unicode);
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if (index) {
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*sizex = (bmfont->glyphs[index].sizex) / (float) (bmfont->glyphs[0].sizex);
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*sizey = (bmfont->glyphs[index].sizey) / (float) (bmfont->glyphs[0].sizey);
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*transx = bmfont->glyphs[index].locx / (float) ibuf->x;
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*transy = (ibuf->y - bmfont->glyphs[index].locy) / (float) ibuf->y;
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*centerx = bmfont->glyphs[0].locx / (float) ibuf->x;
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*centery = (ibuf->y - bmfont->glyphs[0].locy) / (float) ibuf->y;
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// 2.0 units is the default size of an object
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*movey = (float)(1.0 - *sizey + 2.0 * (bmfont->glyphs[index].ofsy - bmfont->glyphs[0].ofsy) / (float) bmfont->glyphs[0].sizey);
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*movex = (float)(*sizex - 1.0 + 2.0 * (bmfont->glyphs[index].ofsx - bmfont->glyphs[0].ofsx) / (float) bmfont->glyphs[0].sizex);
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*advance = (float)(2.0 * bmfont->glyphs[index].advance / (float) bmfont->glyphs[0].advance);
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// printfGlyph(&bmfont->glyphs[index]);
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// printf("%c %d %0.5f %0.5f %0.5f %0.5f %0.5f \n", unicode, index, *sizex, *sizey, *transx, *transy, *advance);
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}
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}
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}
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}
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