1 /***************************************************************************/ |
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2 /* */ |
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3 /* ftrend1.c */ |
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4 /* */ |
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5 /* The FreeType glyph rasterizer interface (body). */ |
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6 /* */ |
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7 /* Copyright 1996-2001, 2002, 2003, 2005, 2006 by */ |
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8 /* David Turner, Robert Wilhelm, and Werner Lemberg. */ |
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9 /* */ |
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10 /* This file is part of the FreeType project, and may only be used, */ |
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11 /* modified, and distributed under the terms of the FreeType project */ |
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12 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ |
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13 /* this file you indicate that you have read the license and */ |
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14 /* understand and accept it fully. */ |
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15 /* */ |
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16 /***************************************************************************/ |
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17 |
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18 |
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19 #include <ft2build.h> |
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20 #include FT_INTERNAL_OBJECTS_H |
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21 #include FT_OUTLINE_H |
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22 #include "ftrend1.h" |
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23 #include "ftraster.h" |
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24 #include "rastpic.h" |
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25 |
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26 #include "rasterrs.h" |
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27 |
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28 |
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29 /* initialize renderer -- init its raster */ |
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30 static FT_Error |
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31 ft_raster1_init( FT_Renderer render ) |
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32 { |
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33 FT_Library library = FT_MODULE_LIBRARY( render ); |
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34 |
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35 |
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36 render->clazz->raster_class->raster_reset( render->raster, |
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37 library->raster_pool, |
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38 library->raster_pool_size ); |
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39 |
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40 return Raster_Err_Ok; |
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41 } |
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42 |
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43 |
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44 /* set render-specific mode */ |
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45 static FT_Error |
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46 ft_raster1_set_mode( FT_Renderer render, |
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47 FT_ULong mode_tag, |
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48 FT_Pointer data ) |
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49 { |
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50 /* we simply pass it to the raster */ |
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51 return render->clazz->raster_class->raster_set_mode( render->raster, |
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52 mode_tag, |
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53 data ); |
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54 } |
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55 |
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56 |
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57 /* transform a given glyph image */ |
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58 static FT_Error |
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59 ft_raster1_transform( FT_Renderer render, |
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60 FT_GlyphSlot slot, |
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61 const FT_Matrix* matrix, |
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62 const FT_Vector* delta ) |
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63 { |
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64 FT_Error error = Raster_Err_Ok; |
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65 |
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66 |
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67 if ( slot->format != render->glyph_format ) |
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68 { |
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69 error = Raster_Err_Invalid_Argument; |
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70 goto Exit; |
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71 } |
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72 |
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73 if ( matrix ) |
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74 FT_Outline_Transform( &slot->outline, matrix ); |
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75 |
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76 if ( delta ) |
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77 FT_Outline_Translate( &slot->outline, delta->x, delta->y ); |
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78 |
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79 Exit: |
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80 return error; |
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81 } |
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82 |
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83 |
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84 /* return the glyph's control box */ |
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85 static void |
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86 ft_raster1_get_cbox( FT_Renderer render, |
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87 FT_GlyphSlot slot, |
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88 FT_BBox* cbox ) |
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89 { |
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90 FT_MEM_ZERO( cbox, sizeof ( *cbox ) ); |
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91 |
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92 if ( slot->format == render->glyph_format ) |
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93 FT_Outline_Get_CBox( &slot->outline, cbox ); |
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94 } |
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95 |
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96 |
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97 /* convert a slot's glyph image into a bitmap */ |
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98 static FT_Error |
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99 ft_raster1_render( FT_Renderer render, |
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100 FT_GlyphSlot slot, |
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101 FT_Render_Mode mode, |
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102 const FT_Vector* origin ) |
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103 { |
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104 FT_Error error; |
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105 FT_Outline* outline; |
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106 FT_BBox cbox; |
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107 FT_UInt width, height, pitch; |
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108 FT_Bitmap* bitmap; |
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109 FT_Memory memory; |
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110 |
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111 FT_Raster_Params params; |
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112 |
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113 |
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114 /* check glyph image format */ |
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115 if ( slot->format != render->glyph_format ) |
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116 { |
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117 error = Raster_Err_Invalid_Argument; |
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118 goto Exit; |
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119 } |
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120 |
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121 /* check rendering mode */ |
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122 #ifndef FT_CONFIG_OPTION_PIC |
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123 if ( mode != FT_RENDER_MODE_MONO ) |
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124 { |
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125 /* raster1 is only capable of producing monochrome bitmaps */ |
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126 if ( render->clazz == &ft_raster1_renderer_class ) |
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127 return Raster_Err_Cannot_Render_Glyph; |
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128 } |
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129 else |
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130 { |
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131 /* raster5 is only capable of producing 5-gray-levels bitmaps */ |
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132 if ( render->clazz == &ft_raster5_renderer_class ) |
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133 return Raster_Err_Cannot_Render_Glyph; |
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134 } |
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135 #else /* FT_CONFIG_OPTION_PIC */ |
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136 /* When PIC is enabled, we cannot get to the class object */ |
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137 /* so instead we check the final character in the class name */ |
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138 /* ("raster5" or "raster1"). Yes this is a hack. */ |
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139 /* The "correct" thing to do is have different render function */ |
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140 /* for each of the classes. */ |
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141 if ( mode != FT_RENDER_MODE_MONO ) |
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142 { |
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143 /* raster1 is only capable of producing monochrome bitmaps */ |
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144 if ( render->clazz->root.module_name[6] == '1' ) |
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145 return Raster_Err_Cannot_Render_Glyph; |
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146 } |
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147 else |
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148 { |
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149 /* raster5 is only capable of producing 5-gray-levels bitmaps */ |
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150 if ( render->clazz->root.module_name[6] == '5' ) |
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151 return Raster_Err_Cannot_Render_Glyph; |
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152 } |
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153 #endif /* FT_CONFIG_OPTION_PIC */ |
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154 |
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155 outline = &slot->outline; |
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156 |
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157 /* translate the outline to the new origin if needed */ |
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158 if ( origin ) |
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159 FT_Outline_Translate( outline, origin->x, origin->y ); |
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160 |
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161 /* compute the control box, and grid fit it */ |
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162 FT_Outline_Get_CBox( outline, &cbox ); |
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163 |
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164 /* undocumented but confirmed: bbox values get rounded */ |
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165 #if 1 |
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166 cbox.xMin = FT_PIX_ROUND( cbox.xMin ); |
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167 cbox.yMin = FT_PIX_ROUND( cbox.yMin ); |
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168 cbox.xMax = FT_PIX_ROUND( cbox.xMax ); |
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169 cbox.yMax = FT_PIX_ROUND( cbox.yMax ); |
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170 #else |
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171 cbox.xMin = FT_PIX_FLOOR( cbox.xMin ); |
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172 cbox.yMin = FT_PIX_FLOOR( cbox.yMin ); |
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173 cbox.xMax = FT_PIX_CEIL( cbox.xMax ); |
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174 cbox.yMax = FT_PIX_CEIL( cbox.yMax ); |
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175 #endif |
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176 |
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177 width = (FT_UInt)( ( cbox.xMax - cbox.xMin ) >> 6 ); |
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178 height = (FT_UInt)( ( cbox.yMax - cbox.yMin ) >> 6 ); |
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179 bitmap = &slot->bitmap; |
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180 memory = render->root.memory; |
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181 |
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182 /* release old bitmap buffer */ |
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183 if ( slot->internal->flags & FT_GLYPH_OWN_BITMAP ) |
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184 { |
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185 FT_FREE( bitmap->buffer ); |
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186 slot->internal->flags &= ~FT_GLYPH_OWN_BITMAP; |
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187 } |
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188 |
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189 /* allocate new one, depends on pixel format */ |
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190 if ( !( mode & FT_RENDER_MODE_MONO ) ) |
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191 { |
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192 /* we pad to 32 bits, only for backwards compatibility with FT 1.x */ |
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193 pitch = FT_PAD_CEIL( width, 4 ); |
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194 bitmap->pixel_mode = FT_PIXEL_MODE_GRAY; |
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195 bitmap->num_grays = 256; |
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196 } |
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197 else |
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198 { |
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199 pitch = ( ( width + 15 ) >> 4 ) << 1; |
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200 bitmap->pixel_mode = FT_PIXEL_MODE_MONO; |
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201 } |
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202 |
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203 bitmap->width = width; |
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204 bitmap->rows = height; |
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205 bitmap->pitch = pitch; |
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206 |
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207 if ( FT_ALLOC_MULT( bitmap->buffer, pitch, height ) ) |
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208 goto Exit; |
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209 |
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210 slot->internal->flags |= FT_GLYPH_OWN_BITMAP; |
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211 |
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212 /* translate outline to render it into the bitmap */ |
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213 FT_Outline_Translate( outline, -cbox.xMin, -cbox.yMin ); |
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214 |
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215 /* set up parameters */ |
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216 params.target = bitmap; |
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217 params.source = outline; |
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218 params.flags = 0; |
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219 |
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220 if ( bitmap->pixel_mode == FT_PIXEL_MODE_GRAY ) |
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221 params.flags |= FT_RASTER_FLAG_AA; |
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222 |
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223 /* render outline into the bitmap */ |
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224 error = render->raster_render( render->raster, ¶ms ); |
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225 |
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226 FT_Outline_Translate( outline, cbox.xMin, cbox.yMin ); |
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227 |
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228 if ( error ) |
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229 goto Exit; |
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230 |
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231 slot->format = FT_GLYPH_FORMAT_BITMAP; |
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232 slot->bitmap_left = (FT_Int)( cbox.xMin >> 6 ); |
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233 slot->bitmap_top = (FT_Int)( cbox.yMax >> 6 ); |
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234 |
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235 Exit: |
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236 return error; |
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237 } |
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238 |
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239 |
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240 FT_DEFINE_RENDERER(ft_raster1_renderer_class, |
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241 |
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242 FT_MODULE_RENDERER, |
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243 sizeof( FT_RendererRec ), |
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244 |
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245 "raster1", |
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246 0x10000L, |
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247 0x20000L, |
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248 |
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249 0, /* module specific interface */ |
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250 |
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251 (FT_Module_Constructor)ft_raster1_init, |
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252 (FT_Module_Destructor) 0, |
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253 (FT_Module_Requester) 0 |
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254 , |
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255 |
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256 FT_GLYPH_FORMAT_OUTLINE, |
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257 |
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258 (FT_Renderer_RenderFunc) ft_raster1_render, |
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259 (FT_Renderer_TransformFunc)ft_raster1_transform, |
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260 (FT_Renderer_GetCBoxFunc) ft_raster1_get_cbox, |
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261 (FT_Renderer_SetModeFunc) ft_raster1_set_mode, |
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262 |
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263 (FT_Raster_Funcs*) &FT_STANDARD_RASTER_GET |
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264 ) |
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265 |
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266 |
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267 /* This renderer is _NOT_ part of the default modules; you will need */ |
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268 /* to register it by hand in your application. It should only be */ |
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269 /* used for backwards-compatibility with FT 1.x anyway. */ |
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270 /* */ |
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271 FT_DEFINE_RENDERER(ft_raster5_renderer_class, |
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272 |
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273 |
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274 FT_MODULE_RENDERER, |
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275 sizeof( FT_RendererRec ), |
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276 |
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277 "raster5", |
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278 0x10000L, |
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279 0x20000L, |
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280 |
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281 0, /* module specific interface */ |
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282 |
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283 (FT_Module_Constructor)ft_raster1_init, |
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284 (FT_Module_Destructor) 0, |
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285 (FT_Module_Requester) 0 |
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286 , |
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287 |
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288 FT_GLYPH_FORMAT_OUTLINE, |
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289 |
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290 (FT_Renderer_RenderFunc) ft_raster1_render, |
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291 (FT_Renderer_TransformFunc)ft_raster1_transform, |
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292 (FT_Renderer_GetCBoxFunc) ft_raster1_get_cbox, |
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293 (FT_Renderer_SetModeFunc) ft_raster1_set_mode, |
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294 |
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295 (FT_Raster_Funcs*) &FT_STANDARD_RASTER_GET |
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296 ) |
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297 |
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298 |
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299 /* END */ |
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