1 /***************************************************************************/ 2 /* */ 3 /* ftrend1.c */ 4 /* */ 5 /* The FreeType glyph rasterizer interface (body). */ 6 /* */ 7 /* Copyright 1996-2001, 2002 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 <ft2build.h> 20 #include FT_INTERNAL_OBJECTS_H 21 #include FT_OUTLINE_H 22 #include "ftrend1.h" 23 #include "ftraster.h" 24 25 #include "rasterrs.h" 26 27 28 /* initialize renderer -- init its raster */ 29 static FT_Error ft_raster1_init(FT_Renderer render)30 ft_raster1_init( FT_Renderer render ) 31 { 32 FT_Library library = FT_MODULE_LIBRARY( render ); 33 34 35 render->clazz->raster_class->raster_reset( render->raster, 36 library->raster_pool, 37 library->raster_pool_size ); 38 39 return Raster_Err_Ok; 40 } 41 42 43 /* set render-specific mode */ 44 static FT_Error ft_raster1_set_mode(FT_Renderer render,FT_ULong mode_tag,FT_Pointer data)45 ft_raster1_set_mode( FT_Renderer render, 46 FT_ULong mode_tag, 47 FT_Pointer data ) 48 { 49 /* we simply pass it to the raster */ 50 return render->clazz->raster_class->raster_set_mode( render->raster, 51 mode_tag, 52 data ); 53 } 54 55 56 /* transform a given glyph image */ 57 static FT_Error ft_raster1_transform(FT_Renderer render,FT_GlyphSlot slot,FT_Matrix * matrix,FT_Vector * delta)58 ft_raster1_transform( FT_Renderer render, 59 FT_GlyphSlot slot, 60 FT_Matrix* matrix, 61 FT_Vector* delta ) 62 { 63 FT_Error error = Raster_Err_Ok; 64 65 66 if ( slot->format != render->glyph_format ) 67 { 68 error = Raster_Err_Invalid_Argument; 69 goto Exit; 70 } 71 72 if ( matrix ) 73 FT_Outline_Transform( &slot->outline, matrix ); 74 75 if ( delta ) 76 FT_Outline_Translate( &slot->outline, delta->x, delta->y ); 77 78 Exit: 79 return error; 80 } 81 82 83 /* return the glyph's control box */ 84 static void ft_raster1_get_cbox(FT_Renderer render,FT_GlyphSlot slot,FT_BBox * cbox)85 ft_raster1_get_cbox( FT_Renderer render, 86 FT_GlyphSlot slot, 87 FT_BBox* cbox ) 88 { 89 FT_MEM_ZERO( cbox, sizeof ( *cbox ) ); 90 91 if ( slot->format == render->glyph_format ) 92 FT_Outline_Get_CBox( &slot->outline, cbox ); 93 } 94 95 96 /* convert a slot's glyph image into a bitmap */ 97 static FT_Error ft_raster1_render(FT_Renderer render,FT_GlyphSlot slot,FT_Render_Mode mode,FT_Vector * origin)98 ft_raster1_render( FT_Renderer render, 99 FT_GlyphSlot slot, 100 FT_Render_Mode mode, 101 FT_Vector* origin ) 102 { 103 FT_Error error; 104 FT_Outline* outline; 105 FT_BBox cbox; 106 FT_UInt width, height, pitch; 107 FT_Bitmap* bitmap; 108 FT_Memory memory; 109 110 FT_Raster_Params params; 111 112 113 /* check glyph image format */ 114 if ( slot->format != render->glyph_format ) 115 { 116 error = Raster_Err_Invalid_Argument; 117 goto Exit; 118 } 119 120 /* check rendering mode */ 121 if ( mode != FT_RENDER_MODE_MONO ) 122 { 123 /* raster1 is only capable of producing monochrome bitmaps */ 124 if ( render->clazz == &ft_raster1_renderer_class ) 125 return Raster_Err_Cannot_Render_Glyph; 126 } 127 else 128 { 129 /* raster5 is only capable of producing 5-gray-levels bitmaps */ 130 if ( render->clazz == &ft_raster5_renderer_class ) 131 return Raster_Err_Cannot_Render_Glyph; 132 } 133 134 outline = &slot->outline; 135 136 /* translate the outline to the new origin if needed */ 137 if ( origin ) 138 FT_Outline_Translate( outline, origin->x, origin->y ); 139 140 /* compute the control box, and grid fit it */ 141 FT_Outline_Get_CBox( outline, &cbox ); 142 143 cbox.xMin &= -64; 144 cbox.yMin &= -64; 145 cbox.xMax = ( cbox.xMax + 63 ) & -64; 146 cbox.yMax = ( cbox.yMax + 63 ) & -64; 147 148 width = (FT_UInt)( ( cbox.xMax - cbox.xMin ) >> 6 ); 149 height = (FT_UInt)( ( cbox.yMax - cbox.yMin ) >> 6 ); 150 bitmap = &slot->bitmap; 151 memory = render->root.memory; 152 153 /* release old bitmap buffer */ 154 if ( slot->flags & FT_GLYPH_OWN_BITMAP ) 155 { 156 FT_FREE( bitmap->buffer ); 157 slot->flags &= ~FT_GLYPH_OWN_BITMAP; 158 } 159 160 /* allocate new one, depends on pixel format */ 161 if ( !( mode & FT_RENDER_MODE_MONO ) ) 162 { 163 /* we pad to 32 bits, only for backwards compatibility with FT 1.x */ 164 pitch = ( width + 3 ) & -4; 165 bitmap->pixel_mode = FT_PIXEL_MODE_GRAY; 166 bitmap->num_grays = 256; 167 } 168 else 169 { 170 pitch = ( ( width + 15 ) >> 4 ) << 1; 171 bitmap->pixel_mode = FT_PIXEL_MODE_MONO; 172 } 173 174 bitmap->width = width; 175 bitmap->rows = height; 176 bitmap->pitch = pitch; 177 178 if ( FT_ALLOC( bitmap->buffer, (FT_ULong)pitch * height ) ) 179 goto Exit; 180 181 slot->flags |= FT_GLYPH_OWN_BITMAP; 182 183 /* translate outline to render it into the bitmap */ 184 FT_Outline_Translate( outline, -cbox.xMin, -cbox.yMin ); 185 186 /* set up parameters */ 187 params.target = bitmap; 188 params.source = outline; 189 params.flags = 0; 190 191 if ( bitmap->pixel_mode == FT_PIXEL_MODE_GRAY ) 192 params.flags |= FT_RASTER_FLAG_AA; 193 194 /* render outline into the bitmap */ 195 error = render->raster_render( render->raster, ¶ms ); 196 197 FT_Outline_Translate( outline, cbox.xMin, cbox.yMin ); 198 199 if ( error ) 200 goto Exit; 201 202 slot->format = FT_GLYPH_FORMAT_BITMAP; 203 slot->bitmap_left = (FT_Int)( cbox.xMin >> 6 ); 204 slot->bitmap_top = (FT_Int)( cbox.yMax >> 6 ); 205 206 Exit: 207 return error; 208 } 209 210 211 FT_CALLBACK_TABLE_DEF 212 const FT_Renderer_Class ft_raster1_renderer_class = 213 { 214 { 215 ft_module_renderer, 216 sizeof( FT_RendererRec ), 217 218 "raster1", 219 0x10000L, 220 0x20000L, 221 222 0, /* module specific interface */ 223 224 (FT_Module_Constructor)ft_raster1_init, 225 (FT_Module_Destructor) 0, 226 (FT_Module_Requester) 0 227 }, 228 229 FT_GLYPH_FORMAT_OUTLINE, 230 231 (FT_Renderer_RenderFunc) ft_raster1_render, 232 (FT_Renderer_TransformFunc)ft_raster1_transform, 233 (FT_Renderer_GetCBoxFunc) ft_raster1_get_cbox, 234 (FT_Renderer_SetModeFunc) ft_raster1_set_mode, 235 236 (FT_Raster_Funcs*) &ft_standard_raster 237 }; 238 239 240 /* This renderer is _NOT_ part of the default modules; you will need */ 241 /* to register it by hand in your application. It should only be */ 242 /* used for backwards-compatibility with FT 1.x anyway. */ 243 /* */ 244 FT_CALLBACK_TABLE_DEF 245 const FT_Renderer_Class ft_raster5_renderer_class = 246 { 247 { 248 ft_module_renderer, 249 sizeof( FT_RendererRec ), 250 251 "raster5", 252 0x10000L, 253 0x20000L, 254 255 0, /* module specific interface */ 256 257 (FT_Module_Constructor)ft_raster1_init, 258 (FT_Module_Destructor) 0, 259 (FT_Module_Requester) 0 260 }, 261 262 FT_GLYPH_FORMAT_OUTLINE, 263 264 (FT_Renderer_RenderFunc) ft_raster1_render, 265 (FT_Renderer_TransformFunc)ft_raster1_transform, 266 (FT_Renderer_GetCBoxFunc) ft_raster1_get_cbox, 267 (FT_Renderer_SetModeFunc) ft_raster1_set_mode, 268 269 (FT_Raster_Funcs*) &ft_standard_raster 270 }; 271 272 273 /* END */ 274