1 | /***************************************************************************/ |
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2 | /* */ |
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3 | /* ftsmooth.c */ |
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4 | /* */ |
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5 | /* Anti-aliasing renderer interface (body). */ |
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6 | /* */ |
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7 | /* Copyright 2000-2001, 2002, 2003, 2004, 2005, 2006, 2009 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 "ftsmooth.h" |
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23 | #include "ftgrays.h" |
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24 | |
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25 | #include "ftsmerrs.h" |
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26 | |
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27 | |
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28 | /* initialize renderer -- init its raster */ |
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29 | static FT_Error |
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30 | ft_smooth_init( FT_Renderer render ) |
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31 | { |
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32 | FT_Library library = FT_MODULE_LIBRARY( render ); |
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33 | |
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34 | |
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35 | render->clazz->raster_class->raster_reset( render->raster, |
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36 | library->raster_pool, |
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37 | library->raster_pool_size ); |
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38 | |
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39 | return 0; |
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40 | } |
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41 | |
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42 | |
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43 | /* sets render-specific mode */ |
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44 | static FT_Error |
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45 | ft_smooth_set_mode( FT_Renderer render, |
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46 | FT_ULong mode_tag, |
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47 | FT_Pointer data ) |
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48 | { |
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49 | /* we simply pass it to the raster */ |
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50 | return render->clazz->raster_class->raster_set_mode( render->raster, |
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51 | mode_tag, |
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52 | data ); |
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53 | } |
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54 | |
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55 | /* transform a given glyph image */ |
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56 | static FT_Error |
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57 | ft_smooth_transform( FT_Renderer render, |
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58 | FT_GlyphSlot slot, |
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59 | const FT_Matrix* matrix, |
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60 | const FT_Vector* delta ) |
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61 | { |
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62 | FT_Error error = Smooth_Err_Ok; |
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63 | |
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64 | |
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65 | if ( slot->format != render->glyph_format ) |
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66 | { |
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67 | error = Smooth_Err_Invalid_Argument; |
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68 | goto Exit; |
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69 | } |
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70 | |
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71 | if ( matrix ) |
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72 | FT_Outline_Transform( &slot->outline, matrix ); |
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73 | |
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74 | if ( delta ) |
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75 | FT_Outline_Translate( &slot->outline, delta->x, delta->y ); |
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76 | |
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77 | Exit: |
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78 | return error; |
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79 | } |
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80 | |
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81 | |
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82 | /* return the glyph's control box */ |
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83 | static void |
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84 | ft_smooth_get_cbox( FT_Renderer render, |
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85 | FT_GlyphSlot slot, |
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86 | FT_BBox* cbox ) |
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87 | { |
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88 | FT_MEM_ZERO( cbox, sizeof ( *cbox ) ); |
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89 | |
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90 | if ( slot->format == render->glyph_format ) |
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91 | FT_Outline_Get_CBox( &slot->outline, cbox ); |
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92 | } |
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93 | |
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94 | |
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95 | /* convert a slot's glyph image into a bitmap */ |
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96 | static FT_Error |
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97 | ft_smooth_render_generic( FT_Renderer render, |
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98 | FT_GlyphSlot slot, |
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99 | FT_Render_Mode mode, |
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100 | const FT_Vector* origin, |
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101 | FT_Render_Mode required_mode ) |
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102 | { |
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103 | FT_Error error; |
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104 | FT_Outline* outline = NULL; |
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105 | FT_BBox cbox; |
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106 | FT_UInt width, height, height_org, width_org, pitch; |
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107 | FT_Bitmap* bitmap; |
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108 | FT_Memory memory; |
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109 | FT_Int hmul = mode == FT_RENDER_MODE_LCD; |
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110 | FT_Int vmul = mode == FT_RENDER_MODE_LCD_V; |
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111 | FT_Pos x_shift, y_shift, x_left, y_top; |
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112 | |
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113 | FT_Raster_Params params; |
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114 | |
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115 | |
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116 | /* check glyph image format */ |
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117 | if ( slot->format != render->glyph_format ) |
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118 | { |
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119 | error = Smooth_Err_Invalid_Argument; |
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120 | goto Exit; |
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121 | } |
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122 | |
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123 | /* check mode */ |
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124 | if ( mode != required_mode ) |
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125 | return Smooth_Err_Cannot_Render_Glyph; |
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126 | |
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127 | outline = &slot->outline; |
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128 | |
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129 | /* translate the outline to the new origin if needed */ |
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130 | if ( origin ) |
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131 | FT_Outline_Translate( outline, origin->x, origin->y ); |
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132 | |
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133 | /* compute the control box, and grid fit it */ |
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134 | FT_Outline_Get_CBox( outline, &cbox ); |
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135 | |
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136 | cbox.xMin = FT_PIX_FLOOR( cbox.xMin ); |
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137 | cbox.yMin = FT_PIX_FLOOR( cbox.yMin ); |
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138 | cbox.xMax = FT_PIX_CEIL( cbox.xMax ); |
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139 | cbox.yMax = FT_PIX_CEIL( cbox.yMax ); |
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140 | |
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141 | width = (FT_UInt)( ( cbox.xMax - cbox.xMin ) >> 6 ); |
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142 | height = (FT_UInt)( ( cbox.yMax - cbox.yMin ) >> 6 ); |
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143 | bitmap = &slot->bitmap; |
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144 | memory = render->root.memory; |
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145 | |
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146 | width_org = width; |
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147 | height_org = height; |
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148 | |
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149 | /* release old bitmap buffer */ |
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150 | if ( slot->internal->flags & FT_GLYPH_OWN_BITMAP ) |
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151 | { |
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152 | FT_FREE( bitmap->buffer ); |
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153 | slot->internal->flags &= ~FT_GLYPH_OWN_BITMAP; |
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154 | } |
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155 | |
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156 | /* allocate new one, depends on pixel format */ |
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157 | pitch = width; |
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158 | if ( hmul ) |
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159 | { |
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160 | width = width * 3; |
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161 | pitch = FT_PAD_CEIL( width, 4 ); |
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162 | } |
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163 | |
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164 | if ( vmul ) |
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165 | height *= 3; |
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166 | |
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167 | x_shift = (FT_Int) cbox.xMin; |
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168 | y_shift = (FT_Int) cbox.yMin; |
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169 | x_left = (FT_Int)( cbox.xMin >> 6 ); |
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170 | y_top = (FT_Int)( cbox.yMax >> 6 ); |
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171 | |
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172 | #ifdef FT_CONFIG_OPTION_SUBPIXEL_RENDERING |
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173 | |
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174 | if ( slot->library->lcd_filter_func ) |
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175 | { |
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176 | FT_Int extra = slot->library->lcd_extra; |
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177 | |
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178 | |
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179 | if ( hmul ) |
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180 | { |
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181 | x_shift -= 64 * ( extra >> 1 ); |
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182 | width += 3 * extra; |
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183 | pitch = FT_PAD_CEIL( width, 4 ); |
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184 | x_left -= extra >> 1; |
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185 | } |
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186 | |
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187 | if ( vmul ) |
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188 | { |
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189 | y_shift -= 64 * ( extra >> 1 ); |
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190 | height += 3 * extra; |
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191 | y_top += extra >> 1; |
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192 | } |
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193 | } |
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194 | |
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195 | #endif |
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196 | |
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197 | bitmap->pixel_mode = FT_PIXEL_MODE_GRAY; |
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198 | bitmap->num_grays = 256; |
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199 | bitmap->width = width; |
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200 | bitmap->rows = height; |
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201 | bitmap->pitch = pitch; |
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202 | |
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203 | /* translate outline to render it into the bitmap */ |
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204 | FT_Outline_Translate( outline, -x_shift, -y_shift ); |
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205 | |
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206 | if ( FT_ALLOC( bitmap->buffer, (FT_ULong)pitch * height ) ) |
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207 | goto Exit; |
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208 | |
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209 | slot->internal->flags |= FT_GLYPH_OWN_BITMAP; |
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210 | |
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211 | /* set up parameters */ |
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212 | params.target = bitmap; |
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213 | params.source = outline; |
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214 | params.flags = FT_RASTER_FLAG_AA; |
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215 | |
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216 | #ifdef FT_CONFIG_OPTION_SUBPIXEL_RENDERING |
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217 | |
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218 | /* implode outline if needed */ |
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219 | { |
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220 | FT_Vector* points = outline->points; |
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221 | FT_Vector* points_end = points + outline->n_points; |
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222 | FT_Vector* vec; |
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223 | |
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224 | |
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225 | if ( hmul ) |
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226 | for ( vec = points; vec < points_end; vec++ ) |
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227 | vec->x *= 3; |
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228 | |
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229 | if ( vmul ) |
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230 | for ( vec = points; vec < points_end; vec++ ) |
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231 | vec->y *= 3; |
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232 | } |
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233 | |
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234 | /* render outline into the bitmap */ |
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235 | error = render->raster_render( render->raster, ¶ms ); |
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236 | |
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237 | /* deflate outline if needed */ |
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238 | { |
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239 | FT_Vector* points = outline->points; |
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240 | FT_Vector* points_end = points + outline->n_points; |
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241 | FT_Vector* vec; |
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242 | |
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243 | |
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244 | if ( hmul ) |
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245 | for ( vec = points; vec < points_end; vec++ ) |
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246 | vec->x /= 3; |
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247 | |
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248 | if ( vmul ) |
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249 | for ( vec = points; vec < points_end; vec++ ) |
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250 | vec->y /= 3; |
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251 | } |
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252 | |
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253 | if ( slot->library->lcd_filter_func ) |
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254 | slot->library->lcd_filter_func( bitmap, mode, slot->library ); |
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255 | |
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256 | #else /* !FT_CONFIG_OPTION_SUBPIXEL_RENDERING */ |
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257 | |
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258 | /* render outline into bitmap */ |
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259 | error = render->raster_render( render->raster, ¶ms ); |
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260 | |
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261 | /* expand it horizontally */ |
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262 | if ( hmul ) |
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263 | { |
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264 | FT_Byte* line = bitmap->buffer; |
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265 | FT_UInt hh; |
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266 | |
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267 | |
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268 | for ( hh = height_org; hh > 0; hh--, line += pitch ) |
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269 | { |
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270 | FT_UInt xx; |
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271 | FT_Byte* end = line + width; |
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272 | |
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273 | |
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274 | for ( xx = width_org; xx > 0; xx-- ) |
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275 | { |
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276 | FT_UInt pixel = line[xx-1]; |
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277 | |
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278 | |
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279 | end[-3] = (FT_Byte)pixel; |
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280 | end[-2] = (FT_Byte)pixel; |
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281 | end[-1] = (FT_Byte)pixel; |
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282 | end -= 3; |
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283 | } |
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284 | } |
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285 | } |
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286 | |
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287 | /* expand it vertically */ |
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288 | if ( vmul ) |
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289 | { |
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290 | FT_Byte* read = bitmap->buffer + ( height - height_org ) * pitch; |
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291 | FT_Byte* write = bitmap->buffer; |
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292 | FT_UInt hh; |
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293 | |
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294 | |
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295 | for ( hh = height_org; hh > 0; hh-- ) |
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296 | { |
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297 | ft_memcpy( write, read, pitch ); |
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298 | write += pitch; |
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299 | |
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300 | ft_memcpy( write, read, pitch ); |
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301 | write += pitch; |
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302 | |
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303 | ft_memcpy( write, read, pitch ); |
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304 | write += pitch; |
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305 | read += pitch; |
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306 | } |
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307 | } |
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308 | |
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309 | #endif /* !FT_CONFIG_OPTION_SUBPIXEL_RENDERING */ |
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310 | |
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311 | FT_Outline_Translate( outline, x_shift, y_shift ); |
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312 | |
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313 | if ( error ) |
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314 | goto Exit; |
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315 | |
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316 | slot->format = FT_GLYPH_FORMAT_BITMAP; |
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317 | slot->bitmap_left = x_left; |
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318 | slot->bitmap_top = y_top; |
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319 | |
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320 | Exit: |
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321 | if ( outline && origin ) |
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322 | FT_Outline_Translate( outline, -origin->x, -origin->y ); |
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323 | |
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324 | return error; |
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325 | } |
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326 | |
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327 | |
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328 | /* convert a slot's glyph image into a bitmap */ |
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329 | static FT_Error |
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330 | ft_smooth_render( FT_Renderer render, |
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331 | FT_GlyphSlot slot, |
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332 | FT_Render_Mode mode, |
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333 | const FT_Vector* origin ) |
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334 | { |
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335 | if ( mode == FT_RENDER_MODE_LIGHT ) |
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336 | mode = FT_RENDER_MODE_NORMAL; |
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337 | |
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338 | return ft_smooth_render_generic( render, slot, mode, origin, |
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339 | FT_RENDER_MODE_NORMAL ); |
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340 | } |
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341 | |
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342 | |
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343 | /* convert a slot's glyph image into a horizontal LCD bitmap */ |
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344 | static FT_Error |
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345 | ft_smooth_render_lcd( FT_Renderer render, |
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346 | FT_GlyphSlot slot, |
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347 | FT_Render_Mode mode, |
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348 | const FT_Vector* origin ) |
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349 | { |
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350 | FT_Error error; |
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351 | |
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352 | error = ft_smooth_render_generic( render, slot, mode, origin, |
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353 | FT_RENDER_MODE_LCD ); |
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354 | if ( !error ) |
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355 | slot->bitmap.pixel_mode = FT_PIXEL_MODE_LCD; |
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356 | |
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357 | return error; |
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358 | } |
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359 | |
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360 | |
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361 | /* convert a slot's glyph image into a vertical LCD bitmap */ |
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362 | static FT_Error |
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363 | ft_smooth_render_lcd_v( FT_Renderer render, |
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364 | FT_GlyphSlot slot, |
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365 | FT_Render_Mode mode, |
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366 | const FT_Vector* origin ) |
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367 | { |
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368 | FT_Error error; |
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369 | |
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370 | error = ft_smooth_render_generic( render, slot, mode, origin, |
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371 | FT_RENDER_MODE_LCD_V ); |
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372 | if ( !error ) |
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373 | slot->bitmap.pixel_mode = FT_PIXEL_MODE_LCD_V; |
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374 | |
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375 | return error; |
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376 | } |
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377 | |
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378 | |
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379 | FT_CALLBACK_TABLE_DEF |
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380 | const FT_Renderer_Class ft_smooth_renderer_class = |
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381 | { |
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382 | { |
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383 | FT_MODULE_RENDERER, |
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384 | sizeof( FT_RendererRec ), |
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385 | |
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386 | "smooth", |
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387 | 0x10000L, |
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388 | 0x20000L, |
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389 | |
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390 | 0, /* module specific interface */ |
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391 | |
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392 | (FT_Module_Constructor)ft_smooth_init, |
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393 | (FT_Module_Destructor) 0, |
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394 | (FT_Module_Requester) 0 |
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395 | }, |
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396 | |
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397 | FT_GLYPH_FORMAT_OUTLINE, |
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398 | |
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399 | (FT_Renderer_RenderFunc) ft_smooth_render, |
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400 | (FT_Renderer_TransformFunc)ft_smooth_transform, |
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401 | (FT_Renderer_GetCBoxFunc) ft_smooth_get_cbox, |
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402 | (FT_Renderer_SetModeFunc) ft_smooth_set_mode, |
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403 | |
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404 | (FT_Raster_Funcs*) &ft_grays_raster |
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405 | }; |
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406 | |
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407 | |
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408 | FT_CALLBACK_TABLE_DEF |
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409 | const FT_Renderer_Class ft_smooth_lcd_renderer_class = |
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410 | { |
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411 | { |
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412 | FT_MODULE_RENDERER, |
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413 | sizeof( FT_RendererRec ), |
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414 | |
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415 | "smooth-lcd", |
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416 | 0x10000L, |
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417 | 0x20000L, |
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418 | |
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419 | 0, /* module specific interface */ |
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420 | |
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421 | (FT_Module_Constructor)ft_smooth_init, |
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422 | (FT_Module_Destructor) 0, |
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423 | (FT_Module_Requester) 0 |
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424 | }, |
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425 | |
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426 | FT_GLYPH_FORMAT_OUTLINE, |
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427 | |
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428 | (FT_Renderer_RenderFunc) ft_smooth_render_lcd, |
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429 | (FT_Renderer_TransformFunc)ft_smooth_transform, |
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430 | (FT_Renderer_GetCBoxFunc) ft_smooth_get_cbox, |
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431 | (FT_Renderer_SetModeFunc) ft_smooth_set_mode, |
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432 | |
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433 | (FT_Raster_Funcs*) &ft_grays_raster |
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434 | }; |
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435 | |
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436 | |
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437 | |
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438 | FT_CALLBACK_TABLE_DEF |
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439 | const FT_Renderer_Class ft_smooth_lcdv_renderer_class = |
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440 | { |
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441 | { |
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442 | FT_MODULE_RENDERER, |
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443 | sizeof( FT_RendererRec ), |
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444 | |
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445 | "smooth-lcdv", |
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446 | 0x10000L, |
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447 | 0x20000L, |
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448 | |
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449 | 0, /* module specific interface */ |
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450 | |
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451 | (FT_Module_Constructor)ft_smooth_init, |
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452 | (FT_Module_Destructor) 0, |
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453 | (FT_Module_Requester) 0 |
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454 | }, |
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455 | |
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456 | FT_GLYPH_FORMAT_OUTLINE, |
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457 | |
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458 | (FT_Renderer_RenderFunc) ft_smooth_render_lcd_v, |
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459 | (FT_Renderer_TransformFunc)ft_smooth_transform, |
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460 | (FT_Renderer_GetCBoxFunc) ft_smooth_get_cbox, |
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461 | (FT_Renderer_SetModeFunc) ft_smooth_set_mode, |
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462 | |
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463 | (FT_Raster_Funcs*) &ft_grays_raster |
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464 | }; |
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465 | |
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466 | |
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467 | /* END */ |
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