1 /**************************************************************************** 2 * 3 * ftrend1.c 4 * 5 * The FreeType glyph rasterizer interface (body). 6 * 7 * Copyright 1996-2018 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 26 #include "rasterrs.h" 27 28 29 /* initialize renderer -- init its raster */ 30 static FT_Error ft_raster1_init(FT_Renderer render)31 ft_raster1_init( FT_Renderer render ) 32 { 33 render->clazz->raster_class->raster_reset( render->raster, NULL, 0 ); 34 35 return FT_Err_Ok; 36 } 37 38 39 /* set render-specific mode */ 40 static FT_Error ft_raster1_set_mode(FT_Renderer render,FT_ULong mode_tag,FT_Pointer data)41 ft_raster1_set_mode( FT_Renderer render, 42 FT_ULong mode_tag, 43 FT_Pointer data ) 44 { 45 /* we simply pass it to the raster */ 46 return render->clazz->raster_class->raster_set_mode( render->raster, 47 mode_tag, 48 data ); 49 } 50 51 52 /* transform a given glyph image */ 53 static FT_Error ft_raster1_transform(FT_Renderer render,FT_GlyphSlot slot,const FT_Matrix * matrix,const FT_Vector * delta)54 ft_raster1_transform( FT_Renderer render, 55 FT_GlyphSlot slot, 56 const FT_Matrix* matrix, 57 const FT_Vector* delta ) 58 { 59 FT_Error error = FT_Err_Ok; 60 61 62 if ( slot->format != render->glyph_format ) 63 { 64 error = FT_THROW( Invalid_Argument ); 65 goto Exit; 66 } 67 68 if ( matrix ) 69 FT_Outline_Transform( &slot->outline, matrix ); 70 71 if ( delta ) 72 FT_Outline_Translate( &slot->outline, delta->x, delta->y ); 73 74 Exit: 75 return error; 76 } 77 78 79 /* return the glyph's control box */ 80 static void ft_raster1_get_cbox(FT_Renderer render,FT_GlyphSlot slot,FT_BBox * cbox)81 ft_raster1_get_cbox( FT_Renderer render, 82 FT_GlyphSlot slot, 83 FT_BBox* cbox ) 84 { 85 FT_ZERO( cbox ); 86 87 if ( slot->format == render->glyph_format ) 88 FT_Outline_Get_CBox( &slot->outline, cbox ); 89 } 90 91 92 /* convert a slot's glyph image into a bitmap */ 93 static FT_Error ft_raster1_render(FT_Renderer render,FT_GlyphSlot slot,FT_Render_Mode mode,const FT_Vector * origin)94 ft_raster1_render( FT_Renderer render, 95 FT_GlyphSlot slot, 96 FT_Render_Mode mode, 97 const FT_Vector* origin ) 98 { 99 FT_Error error = FT_Err_Ok; 100 FT_Outline* outline = &slot->outline; 101 FT_Bitmap* bitmap = &slot->bitmap; 102 FT_Memory memory = render->root.memory; 103 FT_Pos x_shift = 0; 104 FT_Pos y_shift = 0; 105 106 FT_Raster_Params params; 107 108 109 /* check glyph image format */ 110 if ( slot->format != render->glyph_format ) 111 { 112 error = FT_THROW( Invalid_Argument ); 113 goto Exit; 114 } 115 116 /* check rendering mode */ 117 if ( mode != FT_RENDER_MODE_MONO ) 118 { 119 /* raster1 is only capable of producing monochrome bitmaps */ 120 return FT_THROW( Cannot_Render_Glyph ); 121 } 122 123 /* release old bitmap buffer */ 124 if ( slot->internal->flags & FT_GLYPH_OWN_BITMAP ) 125 { 126 FT_FREE( bitmap->buffer ); 127 slot->internal->flags &= ~FT_GLYPH_OWN_BITMAP; 128 } 129 130 ft_glyphslot_preset_bitmap( slot, mode, origin ); 131 132 if ( bitmap->width > 0x7FFF || bitmap->rows > 0x7FFF ) 133 { 134 FT_ERROR(( "ft_raster1_render: glyph is too large: %u x %u\n", 135 bitmap->width, bitmap->rows )); 136 error = FT_THROW( Raster_Overflow ); 137 goto Exit; 138 } 139 140 /* allocate new one */ 141 if ( FT_ALLOC_MULT( bitmap->buffer, bitmap->rows, bitmap->pitch ) ) 142 goto Exit; 143 144 slot->internal->flags |= FT_GLYPH_OWN_BITMAP; 145 146 x_shift = -slot->bitmap_left * 64; 147 y_shift = ( (FT_Int)bitmap->rows - slot->bitmap_top ) * 64; 148 149 if ( origin ) 150 { 151 x_shift += origin->x; 152 y_shift += origin->y; 153 } 154 155 /* translate outline to render it into the bitmap */ 156 if ( x_shift || y_shift ) 157 FT_Outline_Translate( outline, x_shift, y_shift ); 158 159 /* set up parameters */ 160 params.target = bitmap; 161 params.source = outline; 162 params.flags = FT_RASTER_FLAG_DEFAULT; 163 164 /* render outline into the bitmap */ 165 error = render->raster_render( render->raster, ¶ms ); 166 167 Exit: 168 if ( !error ) 169 /* everything is fine; the glyph is now officially a bitmap */ 170 slot->format = FT_GLYPH_FORMAT_BITMAP; 171 else if ( slot->internal->flags & FT_GLYPH_OWN_BITMAP ) 172 { 173 FT_FREE( bitmap->buffer ); 174 slot->internal->flags &= ~FT_GLYPH_OWN_BITMAP; 175 } 176 177 if ( x_shift || y_shift ) 178 FT_Outline_Translate( outline, -x_shift, -y_shift ); 179 180 return error; 181 } 182 183 184 FT_DEFINE_RENDERER( 185 ft_raster1_renderer_class, 186 187 FT_MODULE_RENDERER, 188 sizeof ( FT_RendererRec ), 189 190 "raster1", 191 0x10000L, 192 0x20000L, 193 194 NULL, /* module specific interface */ 195 196 (FT_Module_Constructor)ft_raster1_init, /* module_init */ 197 (FT_Module_Destructor) NULL, /* module_done */ 198 (FT_Module_Requester) NULL, /* get_interface */ 199 200 FT_GLYPH_FORMAT_OUTLINE, 201 202 (FT_Renderer_RenderFunc) ft_raster1_render, /* render_glyph */ 203 (FT_Renderer_TransformFunc)ft_raster1_transform, /* transform_glyph */ 204 (FT_Renderer_GetCBoxFunc) ft_raster1_get_cbox, /* get_glyph_cbox */ 205 (FT_Renderer_SetModeFunc) ft_raster1_set_mode, /* set_mode */ 206 207 (FT_Raster_Funcs*)&ft_standard_raster /* raster_class */ 208 ) 209 210 211 /* END */ 212