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annotate dmtext_bm.c @ 70:a791146e3094

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Make BM text work, a bit at least.
author Matti Hamalainen <ccr@tnsp.org>
date Mon, 01 Oct 2012 13:42:47 +0300
parents f18ad054a695
children 295d08376744
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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
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9
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10 void dmDrawBMTextConst(SDL_Surface *screen, DMBitmapFont *font, int mode, int xc, int yc, const char *fmt)
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11 {
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12 const char *ptr = fmt;
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13 DMScaledBlitFunc blit = dmGetScaledBlitFunc(font->glyphs[0]->format, screen->format, mode);
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14
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15 while (*ptr)
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16 {
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17 SDL_Surface *glyph;
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18 int pos;
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19 int ch = *ptr++;
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20
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21 if (ch == 'ยง')
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22 {
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23 xc += 15;
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24 continue;
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25 }
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26 else
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27 if (ch >= 'A' && ch <= 'Z')
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28 pos = ch - 'A' + 256 + 1;
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29 else
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30 if (ch >= 'a' && ch <= 'z')
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31 pos = ch - 'a' + 1;
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32 else
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33 if (ch >= '0' && ch <= '9')
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34 pos = ch - '0' + 48;
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35 else
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36 pos = ch;
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37
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38 if (pos >= 0 && pos < font->nglyphs)
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39 {
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40 glyph = font->glyphs[pos];
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41 blit(glyph, xc, yc, glyph->w, glyph->h, screen);
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42 xc += glyph->w;
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43 }
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44 else
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45 xc += font->width;
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46 }
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47 }
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49
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50 void dmDrawBMTextVA(SDL_Surface *screen, DMBitmapFont *font, int mode, int xc, int yc, const char *fmt, va_list ap)
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51 {
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52 char *tmp = dm_strdup_vprintf(fmt, ap);
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53 if (tmp != NULL)
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54 {
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55 dmDrawBMTextConst(screen, font, mode, xc, yc, tmp);
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56 dmFree(tmp);
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57 }
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58 }
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59
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60
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61 void dmDrawBMText(SDL_Surface *screen, DMBitmapFont *font, int mode, int xc, int yc, const char *fmt, ...)
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62 {
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63 va_list ap;
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64
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65 va_start(ap, fmt);
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66 dmDrawBMTextVA(screen, font, mode, xc, yc, fmt, ap);
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67 va_end(ap);
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68 }
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69
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71 DMBitmapFont *dmNewBitmapFont(int nglyphs)
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72 {
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73 DMBitmapFont *font = dmMalloc0(sizeof(DMBitmapFont));
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74 if (font == NULL)
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75 return NULL;
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76
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77 font->nglyphs = nglyphs;
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78 font->glyphs = dmCalloc(nglyphs, sizeof(SDL_Surface *));
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79
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80 return font;
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81 }
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82
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83
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84 int dmFreeBitmapFont(DMBitmapFont *font)
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85 {
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86 int i;
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87
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88 if (font == NULL)
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89 return DMERR_NULLPTR;
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90
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91 for (i = 0; i < font->nglyphs; i++)
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92 {
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93 if (font->glyphs[i] != NULL)
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94 {
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95 SDL_FreeSurface(font->glyphs[i]);
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96 font->glyphs[i] = NULL;
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97 }
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98 }
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99
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100 dmFree(font);
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101 return DMERR_OK;
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102 }
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103
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104
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105 int dmLoadBitmapFont(DMResource *res, DMBitmapFont **pfont)
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106 {
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107 return DMERR_OK;
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108 }
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109
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110
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111 int dmCreateBitmapFontFromImage(SDL_Surface *image, int width, int height, DMBitmapFont **pfont)
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112 {
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113 int glyph, xc, yc, xglyphs, yglyphs;
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114 DMBitmapFont *font;
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115
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116 if (image->w < width || width < 4 || image->h < height || height < 4)
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117 return DMERR_INVALID_ARGS;
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118
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119 xglyphs = image->w / width;
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120 yglyphs = image->h / height;
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121
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122 if ((font = dmNewBitmapFont(xglyphs * yglyphs)) == NULL)
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123 return DMERR_MALLOC;
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124
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125 font->width = width;
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126 font->height = height;
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127
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128 fprintf(stderr, "%d x %d split as %d x %d blocks => %d x %d = %d glyphs\n",
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129 image->w, image->h,
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130 width, height,
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131 xglyphs, yglyphs, xglyphs * yglyphs);
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132
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133 glyph = 0;
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134 for (yc = 0; yc < yglyphs; yc++)
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135 for (xc = 0; xc < xglyphs; xc++)
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136 {
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137 SDL_Surface *bmp = SDL_CreateRGBSurface(SDL_SWSURFACE, width, height,
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138 image->format->BitsPerPixel,
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139 image->format->Rmask,
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140 image->format->Gmask,
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141 image->format->Bmask,
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142 image->format->Amask);
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143
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144 if (bmp == NULL)
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145 {
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146 dmFreeBitmapFont(font);
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147 return DMERR_MALLOC;
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148 }
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149
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150 SDL_Rect r;
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151 r.x = xc * width;
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152 r.y = yc * height;
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153 r.w = width;
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154 r.h = height;
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155
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156 SDL_BlitSurface(image, &r, bmp, NULL);
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157
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158 font->glyphs[glyph++] = bmp;
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159 }
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160
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161 *pfont = font;
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162 return DMERR_OK;
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163 }