1 /***************************************************************************/ 2 /* */ 3 /* ftrend1.c */ 4 /* */ 5 /* The FreeType glyph rasterizer interface (body). */ 6 /* */ 7 /* Copyright 1996-2003, 2005, 2006, 2011, 2013 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_DEBUG_H 21 #include FT_INTERNAL_OBJECTS_H 22 #include FT_OUTLINE_H 23 #include "ftrend1.h" 24 #include "ftraster.h" 25 #include "rastpic.h" 26 27 #include "rasterrs.h" 28 29 30 /* initialize renderer -- init its raster */ 31 static FT_Error 32 ft_raster1_init( FT_Renderer render ) 33 { 34 FT_Library library = FT_MODULE_LIBRARY( render ); 35 36 37 render->clazz->raster_class->raster_reset( render->raster, 38 library->raster_pool, 39 library->raster_pool_size ); 40 41 return FT_Err_Ok; 42 } 43 44 45 /* set render-specific mode */ 46 static FT_Error 47 ft_raster1_set_mode( FT_Renderer render, 48 FT_ULong mode_tag, 49 FT_Pointer data ) 50 { 51 /* we simply pass it to the raster */ 52 return render->clazz->raster_class->raster_set_mode( render->raster, 53 mode_tag, 54 data ); 55 } 56 57 58 /* transform a given glyph image */ 59 static FT_Error 60 ft_raster1_transform( FT_Renderer render, 61 FT_GlyphSlot slot, 62 const FT_Matrix* matrix, 63 const FT_Vector* delta ) 64 { 65 FT_Error error = FT_Err_Ok; 66 67 68 if ( slot->format != render->glyph_format ) 69 { 70 error = FT_THROW( Invalid_Argument ); 71 goto Exit; 72 } 73 74 if ( matrix ) 75 FT_Outline_Transform( &slot->outline, matrix ); 76 77 if ( delta ) 78 FT_Outline_Translate( &slot->outline, delta->x, delta->y ); 79 80 Exit: 81 return error; 82 } 83 84 85 /* return the glyph's control box */ 86 static void 87 ft_raster1_get_cbox( FT_Renderer render, 88 FT_GlyphSlot slot, 89 FT_BBox* cbox ) 90 { 91 FT_MEM_ZERO( cbox, sizeof ( *cbox ) ); 92 93 if ( slot->format == render->glyph_format ) 94 FT_Outline_Get_CBox( &slot->outline, cbox ); 95 } 96 97 98 /* convert a slot's glyph image into a bitmap */ 99 static FT_Error 100 ft_raster1_render( FT_Renderer render, 101 FT_GlyphSlot slot, 102 FT_Render_Mode mode, 103 const FT_Vector* origin ) 104 { 105 FT_Error error; 106 FT_Outline* outline; 107 FT_BBox cbox; 108 FT_UInt width, height, pitch; 109 FT_Bitmap* bitmap; 110 FT_Memory memory; 111 112 FT_Raster_Params params; 113 114 115 /* check glyph image format */ 116 if ( slot->format != render->glyph_format ) 117 { 118 error = FT_THROW( Invalid_Argument ); 119 goto Exit; 120 } 121 122 /* check rendering mode */ 123 #ifndef FT_CONFIG_OPTION_PIC 124 if ( mode != FT_RENDER_MODE_MONO ) 125 { 126 /* raster1 is only capable of producing monochrome bitmaps */ 127 if ( render->clazz == &ft_raster1_renderer_class ) 128 return FT_THROW( Cannot_Render_Glyph ); 129 } 130 else 131 { 132 /* raster5 is only capable of producing 5-gray-levels bitmaps */ 133 if ( render->clazz == &ft_raster5_renderer_class ) 134 return FT_THROW( Cannot_Render_Glyph ); 135 } 136 #else /* FT_CONFIG_OPTION_PIC */ 137 /* When PIC is enabled, we cannot get to the class object */ 138 /* so instead we check the final character in the class name */ 139 /* ("raster5" or "raster1"). Yes this is a hack. */ 140 /* The "correct" thing to do is have different render function */ 141 /* for each of the classes. */ 142 if ( mode != FT_RENDER_MODE_MONO ) 143 { 144 /* raster1 is only capable of producing monochrome bitmaps */ 145 if ( render->clazz->root.module_name[6] == '1' ) 146 return FT_THROW( Cannot_Render_Glyph ); 147 } 148 else 149 { 150 /* raster5 is only capable of producing 5-gray-levels bitmaps */ 151 if ( render->clazz->root.module_name[6] == '5' ) 152 return FT_THROW( Cannot_Render_Glyph ); 153 } 154 #endif /* FT_CONFIG_OPTION_PIC */ 155 156 outline = &slot->outline; 157 158 /* translate the outline to the new origin if needed */ 159 if ( origin ) 160 FT_Outline_Translate( outline, origin->x, origin->y ); 161 162 /* compute the control box, and grid fit it */ 163 FT_Outline_Get_CBox( outline, &cbox ); 164 165 /* undocumented but confirmed: bbox values get rounded */ 166 #if 1 167 cbox.xMin = FT_PIX_ROUND( cbox.xMin ); 168 cbox.yMin = FT_PIX_ROUND( cbox.yMin ); 169 cbox.xMax = FT_PIX_ROUND( cbox.xMax ); 170 cbox.yMax = FT_PIX_ROUND( cbox.yMax ); 171 #else 172 cbox.xMin = FT_PIX_FLOOR( cbox.xMin ); 173 cbox.yMin = FT_PIX_FLOOR( cbox.yMin ); 174 cbox.xMax = FT_PIX_CEIL( cbox.xMax ); 175 cbox.yMax = FT_PIX_CEIL( cbox.yMax ); 176 #endif 177 178 width = (FT_UInt)( ( cbox.xMax - cbox.xMin ) >> 6 ); 179 height = (FT_UInt)( ( cbox.yMax - cbox.yMin ) >> 6 ); 180 181 if ( width > FT_USHORT_MAX || height > FT_USHORT_MAX ) 182 { 183 error = FT_THROW( Invalid_Argument ); 184 goto Exit; 185 } 186 187 bitmap = &slot->bitmap; 188 memory = render->root.memory; 189 190 /* release old bitmap buffer */ 191 if ( slot->internal->flags & FT_GLYPH_OWN_BITMAP ) 192 { 193 FT_FREE( bitmap->buffer ); 194 slot->internal->flags &= ~FT_GLYPH_OWN_BITMAP; 195 } 196 197 /* allocate new one, depends on pixel format */ 198 if ( !( mode & FT_RENDER_MODE_MONO ) ) 199 { 200 /* we pad to 32 bits, only for backwards compatibility with FT 1.x */ 201 pitch = FT_PAD_CEIL( width, 4 ); 202 bitmap->pixel_mode = FT_PIXEL_MODE_GRAY; 203 bitmap->num_grays = 256; 204 } 205 else 206 { 207 pitch = ( ( width + 15 ) >> 4 ) << 1; 208 bitmap->pixel_mode = FT_PIXEL_MODE_MONO; 209 } 210 211 bitmap->width = width; 212 bitmap->rows = height; 213 bitmap->pitch = pitch; 214 215 if ( FT_ALLOC_MULT( bitmap->buffer, pitch, height ) ) 216 goto Exit; 217 218 slot->internal->flags |= FT_GLYPH_OWN_BITMAP; 219 220 /* translate outline to render it into the bitmap */ 221 FT_Outline_Translate( outline, -cbox.xMin, -cbox.yMin ); 222 223 /* set up parameters */ 224 params.target = bitmap; 225 params.source = outline; 226 params.flags = 0; 227 228 if ( bitmap->pixel_mode == FT_PIXEL_MODE_GRAY ) 229 params.flags |= FT_RASTER_FLAG_AA; 230 231 /* render outline into the bitmap */ 232 error = render->raster_render( render->raster, ¶ms ); 233 234 FT_Outline_Translate( outline, cbox.xMin, cbox.yMin ); 235 236 if ( error ) 237 goto Exit; 238 239 slot->format = FT_GLYPH_FORMAT_BITMAP; 240 slot->bitmap_left = (FT_Int)( cbox.xMin >> 6 ); 241 slot->bitmap_top = (FT_Int)( cbox.yMax >> 6 ); 242 243 Exit: 244 return error; 245 } 246 247 248 FT_DEFINE_RENDERER( ft_raster1_renderer_class, 249 250 FT_MODULE_RENDERER, 251 sizeof ( FT_RendererRec ), 252 253 "raster1", 254 0x10000L, 255 0x20000L, 256 257 0, /* module specific interface */ 258 259 (FT_Module_Constructor)ft_raster1_init, 260 (FT_Module_Destructor) 0, 261 (FT_Module_Requester) 0 262 , 263 264 FT_GLYPH_FORMAT_OUTLINE, 265 266 (FT_Renderer_RenderFunc) ft_raster1_render, 267 (FT_Renderer_TransformFunc)ft_raster1_transform, 268 (FT_Renderer_GetCBoxFunc) ft_raster1_get_cbox, 269 (FT_Renderer_SetModeFunc) ft_raster1_set_mode, 270 271 (FT_Raster_Funcs*) &FT_STANDARD_RASTER_GET 272 ) 273 274 275 /* This renderer is _NOT_ part of the default modules; you will need */ 276 /* to register it by hand in your application. It should only be */ 277 /* used for backwards-compatibility with FT 1.x anyway. */ 278 /* */ 279 FT_DEFINE_RENDERER( ft_raster5_renderer_class, 280 281 FT_MODULE_RENDERER, 282 sizeof ( FT_RendererRec ), 283 284 "raster5", 285 0x10000L, 286 0x20000L, 287 288 0, /* module specific interface */ 289 290 (FT_Module_Constructor)ft_raster1_init, 291 (FT_Module_Destructor) 0, 292 (FT_Module_Requester) 0 293 , 294 295 FT_GLYPH_FORMAT_OUTLINE, 296 297 (FT_Renderer_RenderFunc) ft_raster1_render, 298 (FT_Renderer_TransformFunc)ft_raster1_transform, 299 (FT_Renderer_GetCBoxFunc) ft_raster1_get_cbox, 300 (FT_Renderer_SetModeFunc) ft_raster1_set_mode, 301 302 (FT_Raster_Funcs*) &FT_STANDARD_RASTER_GET 303 ) 304 305 306 /* END */ 307
