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annotate dmtext_bm.c @ 76:7d201aed1fd9

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Cleanups, cosmetics.
author Matti Hamalainen <ccr@tnsp.org>
date Tue, 02 Oct 2012 05:51:25 +0300
parents e6535609c161
children b10884934aca
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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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10
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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 == '_')
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23 {
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24 xc += 4;
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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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50
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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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61
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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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71
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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 dmCreateBitmapFontFromImage(SDL_Surface *image, int width, int height, DMBitmapFont **pfont)
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107 {
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108 int nglyph, xc, yc, xglyphs, yglyphs;
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109 DMBitmapFont *font;
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110
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111 if (image->w < width || width < 4 || image->h < height || height < 4)
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112 return DMERR_INVALID_ARGS;
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113
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114 xglyphs = image->w / width;
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115 yglyphs = image->h / height;
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116
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117 if ((font = dmNewBitmapFont(xglyphs * yglyphs)) == NULL)
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118 return DMERR_MALLOC;
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119
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120 font->width = width;
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121 font->height = height;
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122
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123 /*
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124 fprintf(stderr, "%d x %d split as %d x %d blocks => %d x %d = %d glyphs\n",
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125 image->w, image->h,
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126 width, height,
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127 xglyphs, yglyphs, xglyphs * yglyphs);
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128 */
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129
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130 nglyph = 0;
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131 for (yc = 0; yc < yglyphs; yc++)
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132 for (xc = 0; xc < xglyphs; xc++)
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133 {
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134 SDL_Surface *glyph = SDL_CreateRGBSurface(SDL_SWSURFACE, width, height,
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135 image->format->BitsPerPixel,
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136 image->format->Rmask,
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137 image->format->Gmask,
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138 image->format->Bmask,
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139 image->format->Amask);
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140
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141 if (glyph == NULL)
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142 {
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143 dmFreeBitmapFont(font);
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144 return DMERR_MALLOC;
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145 }
70
a791146e3094 Make BM text work, a bit at least.
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146
a791146e3094 Make BM text work, a bit at least.
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147 SDL_Rect r;
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148 r.x = xc * width;
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149 r.y = yc * height;
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150 r.w = width;
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151 r.h = height;
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152
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153 SDL_BlitSurface(image, &r, glyph, NULL);
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154
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155 font->glyphs[nglyph++] = glyph;
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156 }
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157
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158 *pfont = font;
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159 return DMERR_OK;
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160 }
73
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161
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162
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163 int dmLoadBitmapFont(DMResource *res, DMBitmapFont **pfont)
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164 {
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165 DMBitmapFont *font;
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166 char magic[8];
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167 Uint16 version;
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168 Uint32 width, height, nglyphs;
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169
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170 // Check magic and version
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171 dmf_read_str(res, (Uint8 *) &magic, 6);
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172 dmf_read_le16(res, &version);
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173
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174 if (memcmp(magic, DMFONT_MAGIC, 6) != 0)
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175 return DMERR_INVALID;
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176
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177 if (version != DMFONT_VERSION)
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178 return DMERR_VERSION;
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179
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180 // Check other data
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181 dmf_read_le32(res, &width);
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182 dmf_read_le32(res, &height);
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183 dmf_read_le32(res, &nglyphs);
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184
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185 if (width > 128 || height > 128 || nglyphs > 1024)
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186 return DMERR_INVALID_DATA;
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187
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188 // Allocate font
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189 if ((*pfont = font = dmNewBitmapFont(nglyphs)) == NULL)
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190 return DMERR_MALLOC;
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191
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192 font->width = width;
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193 font->height = height;
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194 font->nglyphs = nglyphs;
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195
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196 // Read glyph data, if any
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197 if (nglyphs > 0)
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198 {
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199 Uint32 i, BitsPerPixel, Rmask, Gmask, Bmask, Amask, pitch;
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200
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201 BitsPerPixel = dmfgetc(res);
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202 dmf_read_le32(res, &Rmask);
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203 dmf_read_le32(res, &Gmask);
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204 dmf_read_le32(res, &Bmask);
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205 dmf_read_le32(res, &Amask);
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206
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207 for (i = 0; i < nglyphs; i++)
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208 {
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209 int y;
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210 Uint8 *pixels;
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211 SDL_Surface *glyph;
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212 dmf_read_le32(res, &width);
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213 dmf_read_le32(res, &height);
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214 dmf_read_le32(res, &pitch);
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215
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216 font->glyphs[i] = glyph = SDL_CreateRGBSurface(
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217 SDL_SWSURFACE, width, height,
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218 BitsPerPixel, Rmask, Gmask,
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219 Bmask,
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220 Amask);
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221
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222 if (glyph == NULL)
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223 return DMERR_MALLOC;
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224
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225 pixels = glyph->pixels;
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226 for (y = 0; y < glyph->h; y++)
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227 {
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228 if (dmfread(pixels, glyph->format->BytesPerPixel, glyph->w, res) != glyph->w)
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229 return DMERR_FREAD;
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230 pixels += glyph->pitch;
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231 }
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232 }
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233 }
e6535609c161 Initial implementation of loading and saving of bitmap fonts.
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234
e6535609c161 Initial implementation of loading and saving of bitmap fonts.
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235 return DMERR_OK;
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diff changeset
236 }
e6535609c161 Initial implementation of loading and saving of bitmap fonts.
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237
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238
73
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239 int dmSaveBitmapFont(DMResource *res, DMBitmapFont *font)
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240 {
75
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241 if (font == NULL)
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242 return DMERR_NULLPTR;
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243
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244 if (!dmf_write_str(res, (Uint8 *) DMFONT_MAGIC, 6))
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245 return DMERR_FWRITE;
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246
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247 dmf_write_le16(res, DMFONT_VERSION);
73
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248 dmf_write_le32(res, font->width);
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249 dmf_write_le32(res, font->height);
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250 dmf_write_le32(res, font->nglyphs);
75
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251
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252 if (font->nglyphs > 0)
73
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diff changeset
253 {
75
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diff changeset
254 int i;
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255 SDL_Surface *glyph = font->glyphs[0];
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diff changeset
256
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257 dmfputc(glyph->format->BitsPerPixel, res);
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258 dmf_write_le32(res, glyph->format->Rmask);
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259 dmf_write_le32(res, glyph->format->Gmask);
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260 dmf_write_le32(res, glyph->format->Bmask);
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261 dmf_write_le32(res, glyph->format->Amask);
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diff changeset
262
e6535609c161 Initial implementation of loading and saving of bitmap fonts.
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263 for (i = 0; i < font->nglyphs; i++)
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diff changeset
264 {
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diff changeset
265 int y;
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266 glyph = font->glyphs[i];
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267 Uint8 *pixels = glyph->pixels;
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diff changeset
268
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diff changeset
269 dmf_write_le32(res, glyph->w);
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diff changeset
270 dmf_write_le32(res, glyph->h);
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diff changeset
271
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272 for (y = 0; y < glyph->h; y++)
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diff changeset
273 {
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274 if (dmfwrite(pixels, glyph->format->BytesPerPixel, glyph->w, res) != glyph->w)
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275 return DMERR_FWRITE;
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276 pixels += glyph->pitch;
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277 }
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diff changeset
278 }
73
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279 }
75
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diff changeset
280
73
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281 return DMERR_OK;
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diff changeset
282 }