1 /***************************************************************************/ 2 /* */ 3 /* ftrend1.c */ 4 /* */ 5 /* The FreeType glyph rasterizer interface (body). */ 6 /* */ 7 /* Copyright 1996-2015 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, cbox0; 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 if ( mode != FT_RENDER_MODE_MONO ) 124 { 125 /* raster1 is only capable of producing monochrome bitmaps */ 126 return FT_THROW( Cannot_Render_Glyph ); 127 } 128 129 outline = &slot->outline; 130 131 /* translate the outline to the new origin if needed */ 132 if ( origin ) 133 FT_Outline_Translate( outline, origin->x, origin->y ); 134 135 /* compute the control box, and grid fit it */ 136 FT_Outline_Get_CBox( outline, &cbox0 ); 137 138 /* undocumented but confirmed: bbox values get rounded */ 139 #if 1 140 cbox.xMin = FT_PIX_ROUND( cbox0.xMin ); 141 cbox.yMin = FT_PIX_ROUND( cbox0.yMin ); 142 cbox.xMax = FT_PIX_ROUND( cbox0.xMax ); 143 cbox.yMax = FT_PIX_ROUND( cbox0.yMax ); 144 #else 145 cbox.xMin = FT_PIX_FLOOR( cbox.xMin ); 146 cbox.yMin = FT_PIX_FLOOR( cbox.yMin ); 147 cbox.xMax = FT_PIX_CEIL( cbox.xMax ); 148 cbox.yMax = FT_PIX_CEIL( cbox.yMax ); 149 #endif 150 151 /* If either `width' or `height' round to 0, try */ 152 /* explicitly rounding up/down. In the case of */ 153 /* glyphs containing only one very narrow feature, */ 154 /* this gives the drop-out compensation in the scan */ 155 /* conversion code a chance to do its stuff. */ 156 width = (FT_UInt)( ( cbox.xMax - cbox.xMin ) >> 6 ); 157 if ( width == 0 ) 158 { 159 cbox.xMin = FT_PIX_FLOOR( cbox0.xMin ); 160 cbox.xMax = FT_PIX_CEIL( cbox0.xMax ); 161 162 width = (FT_UInt)( ( cbox.xMax - cbox.xMin ) >> 6 ); 163 } 164 165 height = (FT_UInt)( ( cbox.yMax - cbox.yMin ) >> 6 ); 166 if ( height == 0 ) 167 { 168 cbox.yMin = FT_PIX_FLOOR( cbox0.yMin ); 169 cbox.yMax = FT_PIX_CEIL( cbox0.yMax ); 170 171 height = (FT_UInt)( ( cbox.yMax - cbox.yMin ) >> 6 ); 172 } 173 174 if ( width > FT_USHORT_MAX || height > FT_USHORT_MAX ) 175 { 176 error = FT_THROW( Invalid_Argument ); 177 goto Exit; 178 } 179 180 bitmap = &slot->bitmap; 181 memory = render->root.memory; 182 183 /* release old bitmap buffer */ 184 if ( slot->internal->flags & FT_GLYPH_OWN_BITMAP ) 185 { 186 FT_FREE( bitmap->buffer ); 187 slot->internal->flags &= ~FT_GLYPH_OWN_BITMAP; 188 } 189 190 pitch = ( ( width + 15 ) >> 4 ) << 1; 191 bitmap->pixel_mode = FT_PIXEL_MODE_MONO; 192 193 bitmap->width = width; 194 bitmap->rows = height; 195 bitmap->pitch = (int)pitch; 196 197 if ( FT_ALLOC_MULT( bitmap->buffer, pitch, height ) ) 198 goto Exit; 199 200 slot->internal->flags |= FT_GLYPH_OWN_BITMAP; 201 202 /* translate outline to render it into the bitmap */ 203 FT_Outline_Translate( outline, -cbox.xMin, -cbox.yMin ); 204 205 /* set up parameters */ 206 params.target = bitmap; 207 params.source = outline; 208 params.flags = 0; 209 210 /* render outline into the bitmap */ 211 error = render->raster_render( render->raster, ¶ms ); 212 213 FT_Outline_Translate( outline, cbox.xMin, cbox.yMin ); 214 215 if ( error ) 216 goto Exit; 217 218 slot->format = FT_GLYPH_FORMAT_BITMAP; 219 slot->bitmap_left = (FT_Int)( cbox.xMin >> 6 ); 220 slot->bitmap_top = (FT_Int)( cbox.yMax >> 6 ); 221 222 Exit: 223 return error; 224 } 225 226 227 FT_DEFINE_RENDERER( ft_raster1_renderer_class, 228 229 FT_MODULE_RENDERER, 230 sizeof ( FT_RendererRec ), 231 232 "raster1", 233 0x10000L, 234 0x20000L, 235 236 0, /* module specific interface */ 237 238 (FT_Module_Constructor)ft_raster1_init, 239 (FT_Module_Destructor) 0, 240 (FT_Module_Requester) 0 241 , 242 243 FT_GLYPH_FORMAT_OUTLINE, 244 245 (FT_Renderer_RenderFunc) ft_raster1_render, 246 (FT_Renderer_TransformFunc)ft_raster1_transform, 247 (FT_Renderer_GetCBoxFunc) ft_raster1_get_cbox, 248 (FT_Renderer_SetModeFunc) ft_raster1_set_mode, 249 250 (FT_Raster_Funcs*) &FT_STANDARD_RASTER_GET 251 ) 252 253 254 /* END */ 255
