| 1 | /***************************************************************************/ |
| 2 | /* */ |
| 3 | /* ftsmooth.c */ |
| 4 | /* */ |
| 5 | /* Anti-aliasing renderer interface (body). */ |
| 6 | /* */ |
| 7 | /* Copyright 2000 by */ |
| 8 | /* David Turner, Robert Wilhelm, and Werner Lemberg. */ |
| 9 | /* */ |
| 10 | /* This file is part of the FreeType project, and may only be used, */ |
| 11 | /* modified, and distributed under the terms of the FreeType project */ |
| 12 | /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ |
| 13 | /* this file you indicate that you have read the license and */ |
| 14 | /* understand and accept it fully. */ |
| 15 | /* */ |
| 16 | /***************************************************************************/ |
| 17 | |
| 18 | |
| 19 | #include <freetype/internal/ftobjs.h> |
| 20 | #include <freetype/ftoutln.h> |
| 21 | |
| 22 | |
| 23 | #ifdef FT_FLAT_COMPILE |
| 24 | |
| 25 | #include "ftsmooth.h" |
| 26 | #include "ftgrays.h" |
| 27 | |
| 28 | #else |
| 29 | |
| 30 | #include <smooth/ftsmooth.h> |
| 31 | #include <smooth/ftgrays.h> |
| 32 | |
| 33 | #endif |
| 34 | |
| 35 | |
| 36 | /* initialize renderer -- init its raster */ |
| 37 | static |
| 38 | FT_Error ft_smooth_init( FT_Renderer render ) |
| 39 | { |
| 40 | FT_Library library = FT_MODULE_LIBRARY( render ); |
| 41 | |
| 42 | |
| 43 | render->clazz->raster_class->raster_reset( render->raster, |
| 44 | library->raster_pool, |
| 45 | library->raster_pool_size ); |
| 46 | |
| 47 | return 0; |
| 48 | } |
| 49 | |
| 50 | |
| 51 | /* sets render-specific mode */ |
| 52 | static |
| 53 | FT_Error ft_smooth_set_mode( FT_Renderer render, |
| 54 | FT_ULong mode_tag, |
| 55 | FT_Pointer data ) |
| 56 | { |
| 57 | /* we simply pass it to the raster */ |
| 58 | return render->clazz->raster_class->raster_set_mode( render->raster, |
| 59 | mode_tag, |
| 60 | data ); |
| 61 | } |
| 62 | |
| 63 | /* transform a given glyph image */ |
| 64 | static |
| 65 | FT_Error ft_smooth_transform( FT_Renderer render, |
| 66 | FT_GlyphSlot slot, |
| 67 | FT_Matrix* matrix, |
| 68 | FT_Vector* delta ) |
| 69 | { |
| 70 | FT_Error error = FT_Err_Ok; |
| 71 | |
| 72 | |
| 73 | if ( slot->format != render->glyph_format ) |
| 74 | { |
| 75 | error = FT_Err_Invalid_Argument; |
| 76 | goto Exit; |
| 77 | } |
| 78 | |
| 79 | if ( matrix ) |
| 80 | FT_Outline_Transform( &slot->outline, matrix ); |
| 81 | |
| 82 | if ( delta ) |
| 83 | FT_Outline_Translate( &slot->outline, delta->x, delta->y ); |
| 84 | |
| 85 | Exit: |
| 86 | return error; |
| 87 | } |
| 88 | |
| 89 | |
| 90 | /* return the glyph's control box */ |
| 91 | static |
| 92 | void ft_smooth_get_cbox( FT_Renderer render, |
| 93 | FT_GlyphSlot slot, |
| 94 | FT_BBox* cbox ) |
| 95 | { |
| 96 | MEM_Set( cbox, 0, sizeof ( *cbox ) ); |
| 97 | |
| 98 | if ( slot->format == render->glyph_format ) |
| 99 | FT_Outline_Get_CBox( &slot->outline, cbox ); |
| 100 | } |
| 101 | |
| 102 | |
| 103 | /* convert a slot's glyph image into a bitmap */ |
| 104 | static |
| 105 | FT_Error ft_smooth_render( FT_Renderer render, |
| 106 | FT_GlyphSlot slot, |
| 107 | FT_UInt mode, |
| 108 | FT_Vector* origin ) |
| 109 | { |
| 110 | FT_Error error; |
| 111 | FT_Outline* outline; |
| 112 | FT_BBox cbox; |
| 113 | FT_UInt width, height, pitch; |
| 114 | FT_Bitmap* bitmap; |
| 115 | FT_Memory memory; |
| 116 | |
| 117 | FT_Raster_Params params; |
| 118 | |
| 119 | |
| 120 | /* check glyph image format */ |
| 121 | if ( slot->format != render->glyph_format ) |
| 122 | { |
| 123 | error = FT_Err_Invalid_Argument; |
| 124 | goto Exit; |
| 125 | } |
| 126 | |
| 127 | /* check mode */ |
| 128 | if ( mode != ft_render_mode_normal ) |
| 129 | return FT_Err_Cannot_Render_Glyph; |
| 130 | |
| 131 | outline = &slot->outline; |
| 132 | |
| 133 | /* translate the outline to the new origin if needed */ |
| 134 | if ( origin ) |
| 135 | FT_Outline_Translate( outline, origin->x, origin->y ); |
| 136 | |
| 137 | /* compute the control box, and grid fit it */ |
| 138 | FT_Outline_Get_CBox( outline, &cbox ); |
| 139 | |
| 140 | cbox.xMin &= -64; |
| 141 | cbox.yMin &= -64; |
| 142 | cbox.xMax = ( cbox.xMax + 63 ) & -64; |
| 143 | cbox.yMax = ( cbox.yMax + 63 ) & -64; |
| 144 | |
| 145 | width = ( cbox.xMax - cbox.xMin ) >> 6; |
| 146 | height = ( cbox.yMax - cbox.yMin ) >> 6; |
| 147 | bitmap = &slot->bitmap; |
| 148 | memory = render->root.memory; |
| 149 | |
| 150 | /* release old bitmap buffer */ |
| 151 | if ( slot->flags & ft_glyph_own_bitmap ) |
| 152 | { |
| 153 | FREE( bitmap->buffer ); |
| 154 | slot->flags &= ~ft_glyph_own_bitmap; |
| 155 | } |
| 156 | |
| 157 | /* allocate new one, depends on pixel format */ |
| 158 | pitch = width; |
| 159 | bitmap->pixel_mode = ft_pixel_mode_grays; |
| 160 | bitmap->num_grays = 256; |
| 161 | bitmap->width = width; |
| 162 | bitmap->rows = height; |
| 163 | bitmap->pitch = pitch; |
| 164 | |
| 165 | if ( ALLOC( bitmap->buffer, (FT_ULong)pitch * height ) ) |
| 166 | goto Exit; |
| 167 | |
| 168 | slot->flags |= ft_glyph_own_bitmap; |
| 169 | |
| 170 | /* translate outline to render it into the bitmap */ |
| 171 | FT_Outline_Translate( outline, -cbox.xMin, -cbox.yMin ); |
| 172 | |
| 173 | /* set up parameters */ |
| 174 | params.target = bitmap; |
| 175 | params.source = outline; |
| 176 | params.flags = ft_raster_flag_aa; |
| 177 | |
| 178 | /* render outline into the bitmap */ |
| 179 | error = render->raster_render( render->raster, ¶ms ); |
| 180 | if ( error ) |
| 181 | goto Exit; |
| 182 | |
| 183 | slot->format = ft_glyph_format_bitmap; |
| 184 | slot->bitmap_left = cbox.xMin >> 6; |
| 185 | slot->bitmap_top = cbox.yMax >> 6; |
| 186 | |
| 187 | Exit: |
| 188 | return error; |
| 189 | } |
| 190 | |
| 191 | |
| 192 | const FT_Renderer_Class ft_smooth_renderer_class = |
| 193 | { |
| 194 | { |
| 195 | ft_module_renderer, |
| 196 | sizeof( FT_RendererRec ), |
| 197 | |
| 198 | "smooth", |
| 199 | 0x10000L, |
| 200 | 0x20000L, |
| 201 | |
| 202 | 0, /* module specific interface */ |
| 203 | |
| 204 | (FT_Module_Constructor)ft_smooth_init, |
| 205 | (FT_Module_Destructor) 0, |
| 206 | (FT_Module_Requester) 0 |
| 207 | }, |
| 208 | |
| 209 | ft_glyph_format_outline, |
| 210 | |
| 211 | (FTRenderer_render) ft_smooth_render, |
| 212 | (FTRenderer_transform)ft_smooth_transform, |
| 213 | (FTRenderer_getCBox) ft_smooth_get_cbox, |
| 214 | (FTRenderer_setMode) ft_smooth_set_mode, |
| 215 | |
| 216 | (FT_Raster_Funcs*) &ft_grays_raster |
| 217 | }; |
| 218 | |
| 219 | |
| 220 | /* END */ |