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annotate dmtext_bm.c @ 73:295d08376744

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Add function for saving a bitmap font.
author Matti Hamalainen <ccr@tnsp.org>
date Mon, 01 Oct 2012 14:18:35 +0300
parents a791146e3094
children e6535609c161
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1 /*
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2 * DMLib
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3 * -- Bitmap and TTF text & font support
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4 * Programmed and designed by Matti 'ccr' Hamalainen
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5 * (C) Copyright 2012 Tecnic Software productions (TNSP)
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6 */
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7 #include "dmtext.h"
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8 #include "dmresw.h"
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9
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11 void dmDrawBMTextConst(SDL_Surface *screen, DMBitmapFont *font, int mode, int xc, int yc, const char *fmt)
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12 {
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13 const char *ptr = fmt;
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14 DMScaledBlitFunc blit = dmGetScaledBlitFunc(font->glyphs[0]->format, screen->format, mode);
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15
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16 while (*ptr)
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17 {
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18 SDL_Surface *glyph;
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19 int pos;
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20 int ch = *ptr++;
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21
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22 if (ch == 'ยง')
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23 {
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24 xc += 15;
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25 continue;
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26 }
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27 else
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28 if (ch >= 'A' && ch <= 'Z')
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29 pos = ch - 'A' + 256 + 1;
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30 else
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31 if (ch >= 'a' && ch <= 'z')
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32 pos = ch - 'a' + 1;
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33 else
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34 if (ch >= '0' && ch <= '9')
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35 pos = ch - '0' + 48;
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36 else
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37 pos = ch;
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38
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39 if (pos >= 0 && pos < font->nglyphs)
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40 {
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41 glyph = font->glyphs[pos];
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42 blit(glyph, xc, yc, glyph->w, glyph->h, screen);
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43 xc += glyph->w;
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44 }
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45 else
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46 xc += font->width;
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47 }
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48 }
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51 void dmDrawBMTextVA(SDL_Surface *screen, DMBitmapFont *font, int mode, int xc, int yc, const char *fmt, va_list ap)
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52 {
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53 char *tmp = dm_strdup_vprintf(fmt, ap);
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54 if (tmp != NULL)
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55 {
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56 dmDrawBMTextConst(screen, font, mode, xc, yc, tmp);
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57 dmFree(tmp);
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58 }
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59 }
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62 void dmDrawBMText(SDL_Surface *screen, DMBitmapFont *font, int mode, int xc, int yc, const char *fmt, ...)
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63 {
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64 va_list ap;
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65
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66 va_start(ap, fmt);
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67 dmDrawBMTextVA(screen, font, mode, xc, yc, fmt, ap);
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68 va_end(ap);
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69 }
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72 DMBitmapFont *dmNewBitmapFont(int nglyphs)
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73 {
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74 DMBitmapFont *font = dmMalloc0(sizeof(DMBitmapFont));
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75 if (font == NULL)
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76 return NULL;
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77
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78 font->nglyphs = nglyphs;
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79 font->glyphs = dmCalloc(nglyphs, sizeof(SDL_Surface *));
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80
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81 return font;
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82 }
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84
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85 int dmFreeBitmapFont(DMBitmapFont *font)
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86 {
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87 int i;
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88
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89 if (font == NULL)
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90 return DMERR_NULLPTR;
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91
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92 for (i = 0; i < font->nglyphs; i++)
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93 {
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94 if (font->glyphs[i] != NULL)
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95 {
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96 SDL_FreeSurface(font->glyphs[i]);
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97 font->glyphs[i] = NULL;
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98 }
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99 }
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100
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101 dmFree(font);
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102 return DMERR_OK;
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103 }
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104
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105
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106 int dmLoadBitmapFont(DMResource *res, DMBitmapFont **pfont)
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107 {
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108 return DMERR_OK;
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109 }
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110
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111
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112 int dmCreateBitmapFontFromImage(SDL_Surface *image, int width, int height, DMBitmapFont **pfont)
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113 {
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114 int glyph, xc, yc, xglyphs, yglyphs;
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115 DMBitmapFont *font;
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116
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117 if (image->w < width || width < 4 || image->h < height || height < 4)
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118 return DMERR_INVALID_ARGS;
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119
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120 xglyphs = image->w / width;
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121 yglyphs = image->h / height;
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122
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123 if ((font = dmNewBitmapFont(xglyphs * yglyphs)) == NULL)
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124 return DMERR_MALLOC;
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125
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126 font->width = width;
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127 font->height = height;
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128
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129 fprintf(stderr, "%d x %d split as %d x %d blocks => %d x %d = %d glyphs\n",
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130 image->w, image->h,
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131 width, height,
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132 xglyphs, yglyphs, xglyphs * yglyphs);
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133
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134 glyph = 0;
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135 for (yc = 0; yc < yglyphs; yc++)
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136 for (xc = 0; xc < xglyphs; xc++)
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137 {
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138 SDL_Surface *bmp = SDL_CreateRGBSurface(SDL_SWSURFACE, width, height,
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139 image->format->BitsPerPixel,
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140 image->format->Rmask,
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141 image->format->Gmask,
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142 image->format->Bmask,
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143 image->format->Amask);
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144
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145 if (bmp == NULL)
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146 {
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147 dmFreeBitmapFont(font);
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148 return DMERR_MALLOC;
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149 }
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150
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151 SDL_Rect r;
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152 r.x = xc * width;
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153 r.y = yc * height;
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154 r.w = width;
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155 r.h = height;
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156
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157 SDL_BlitSurface(image, &r, bmp, NULL);
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158
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159 font->glyphs[glyph++] = bmp;
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160 }
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161
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162 *pfont = font;
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163 return DMERR_OK;
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164 }
73
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165
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166 int dmSaveBitmapFont(DMResource *res, DMBitmapFont *font)
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167 {
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168 int i;
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169
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170 dmf_write_str(res, (Uint8 *) "DMFONT", 6);
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171 dmf_write_le16(res, 0x0100);
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172 dmf_write_le32(res, font->width);
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173 dmf_write_le32(res, font->height);
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174 dmf_write_le32(res, font->nglyphs);
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175
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176 for (i = 0; i < font->nglyphs; i++)
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177 {
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178 SDL_Surface *glyph = font->glyphs[i];
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179 dmf_write_le32(res, glyph->w);
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180 dmf_write_le32(res, glyph->h);
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181 dmf_write_le32(res, glyph->pitch);
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182 dmf_write_str(res, glyph->pixels, glyph->h * glyph->pitch);
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183 }
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184
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185 return DMERR_OK;
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186 }