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1 /*
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2 Copyright 2004 John Tsiombikas <nuclear@siggraph.org>
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3
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4 This file is part of gbasys, a library for GameBoy Advance development.
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5
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6 This program is free software; you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 2 of the License, or
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9 (at your option) any later version.
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10
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11 This program is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with this program; if not, write to the Free Software
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18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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19 */
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20
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21 #include "config.h"
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22 #include <stdlib.h>
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23 #include "font.h"
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24 #include "gbasys.h"
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25
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26 #define DEFAULT_FONT &font_8x8
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27
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28 /* active font */
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29 static struct font *font = DEFAULT_FONT;
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30
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31 /* active color */
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32 static unsigned short fg_color = 0xffff;
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33 static unsigned short bg_color = 0;
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34
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35 /* transparent background */
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36 static unsigned char bg_transparent = 1;
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37
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38 /* ---- state manipulation ---- */
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39 void set_font(struct font *fnt) {
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40 font = fnt;
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41 }
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42
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43 struct font *get_font(void) {
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44 return font;
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45 }
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46
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47 void set_text_color(unsigned short fg, unsigned short bg) {
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48 fg_color = fg;
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49 bg_color = bg;
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50 }
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51
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52 void set_text_writebg(int enable) {
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53 bg_transparent = !enable;
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54 }
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55
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56 struct pixel_buffer *get_glyph(unsigned char c, unsigned short fg, unsigned short bg, int bpp) {
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57 static struct pixel_buffer glyph;
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58
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59 if(glyph.x != font->x || glyph.y != font->y || glyph.bpp != bpp) {
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60 glyph.x = font->x;
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61 glyph.y = font->y;
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62 glyph.bpp = bpp;
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63 free(glyph.pixels);
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64 if(!(glyph.pixels = malloc(glyph.x * glyph.y * (bpp >> 3)))) {
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65 return 0;
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66 }
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67 }
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68
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69 if(bpp == 16) {
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70 int i, j;
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71 unsigned short *dptr = glyph.pixels;
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72 const unsigned char *bit_ptr = (unsigned char*)font->bitmap + font->y * (int)c;
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73 int sz = glyph.x * glyph.y;
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74
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75 for(i=0, j=0; i<sz; i++) {
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76 *dptr++ = (*bit_ptr & (0x80 >> j++)) ? fg : bg;
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77
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78 if(j > 7) {
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79 j = 0;
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80 bit_ptr++;
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81 }
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82 }
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83
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84 return &glyph;
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85 }
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86
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87 return 0;
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88 }
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89
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90 int draw_glyph(unsigned char c, int x, int y, struct pixel_buffer *pbuf) {
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91 struct pixel_buffer *glyph;
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92
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93 if(!(glyph = get_glyph(c, fg_color, bg_color, pbuf->bpp))) return -1;
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94
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95 if(pbuf->bpp == 16) {
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96 int i, j;
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97 unsigned short *dptr = (unsigned short*)pbuf->pixels + y * pbuf->x + x;
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98 unsigned short *sptr = glyph->pixels;
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99 int advance = pbuf->x - glyph->x;
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100
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101 for(j=0; j<glyph->y; j++) {
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102 for(i=0; i<glyph->x; i++) {
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103 if(bg_transparent && *sptr == bg_color) {
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104 dptr++;
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105 sptr++;
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106 } else {
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107 *dptr++ = *sptr++;
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108 }
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109 }
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110 dptr += advance;
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111 }
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112 }
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113
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114 return 0;
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115 }
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116
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117 /* low level string rendering */
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118 int draw_string(const char *str, int x, int y, struct pixel_buffer *pbuf) {
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119 while(*str) {
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120 if(draw_glyph(*str++, x, y, pbuf) == -1) return -1;
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121 x += font->x;
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122 }
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123 return 0;
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124 }
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