1 /**************************************************************************** 2 * 3 * ftrend1.c 4 * 5 * The FreeType glyph rasterizer interface (body). 6 * 7 * Copyright (C) 1996-2020 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/ftdebug.h> 20 #include <freetype/internal/ftobjs.h> 21 #include <freetype/ftoutln.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 render->clazz->raster_class->raster_reset( render->raster, NULL, 0 ); 33 34 return FT_Err_Ok; 35 } 36 37 38 /* set render-specific mode */ 39 static FT_Error ft_raster1_set_mode(FT_Renderer render,FT_ULong mode_tag,FT_Pointer data)40 ft_raster1_set_mode( FT_Renderer render, 41 FT_ULong mode_tag, 42 FT_Pointer data ) 43 { 44 /* we simply pass it to the raster */ 45 return render->clazz->raster_class->raster_set_mode( render->raster, 46 mode_tag, 47 data ); 48 } 49 50 51 /* transform a given glyph image */ 52 static FT_Error ft_raster1_transform(FT_Renderer render,FT_GlyphSlot slot,const FT_Matrix * matrix,const FT_Vector * delta)53 ft_raster1_transform( FT_Renderer render, 54 FT_GlyphSlot slot, 55 const FT_Matrix* matrix, 56 const FT_Vector* delta ) 57 { 58 FT_Error error = FT_Err_Ok; 59 60 61 if ( slot->format != render->glyph_format ) 62 { 63 error = FT_THROW( Invalid_Argument ); 64 goto Exit; 65 } 66 67 if ( matrix ) 68 FT_Outline_Transform( &slot->outline, matrix ); 69 70 if ( delta ) 71 FT_Outline_Translate( &slot->outline, delta->x, delta->y ); 72 73 Exit: 74 return error; 75 } 76 77 78 /* return the glyph's control box */ 79 static void ft_raster1_get_cbox(FT_Renderer render,FT_GlyphSlot slot,FT_BBox * cbox)80 ft_raster1_get_cbox( FT_Renderer render, 81 FT_GlyphSlot slot, 82 FT_BBox* cbox ) 83 { 84 FT_ZERO( cbox ); 85 86 if ( slot->format == render->glyph_format ) 87 FT_Outline_Get_CBox( &slot->outline, cbox ); 88 } 89 90 91 /* convert a slot's glyph image into a bitmap */ 92 static FT_Error ft_raster1_render(FT_Renderer render,FT_GlyphSlot slot,FT_Render_Mode mode,const FT_Vector * origin)93 ft_raster1_render( FT_Renderer render, 94 FT_GlyphSlot slot, 95 FT_Render_Mode mode, 96 const FT_Vector* origin ) 97 { 98 FT_Error error = FT_Err_Ok; 99 FT_Outline* outline = &slot->outline; 100 FT_Bitmap* bitmap = &slot->bitmap; 101 FT_Memory memory = render->root.memory; 102 FT_Pos x_shift = 0; 103 FT_Pos y_shift = 0; 104 105 FT_Raster_Params params; 106 107 108 /* check glyph image format */ 109 if ( slot->format != render->glyph_format ) 110 { 111 error = FT_THROW( Invalid_Argument ); 112 goto Exit; 113 } 114 115 /* check rendering mode */ 116 if ( mode != FT_RENDER_MODE_MONO ) 117 { 118 /* raster1 is only capable of producing monochrome bitmaps */ 119 return FT_THROW( Cannot_Render_Glyph ); 120 } 121 122 /* release old bitmap buffer */ 123 if ( slot->internal->flags & FT_GLYPH_OWN_BITMAP ) 124 { 125 FT_FREE( bitmap->buffer ); 126 slot->internal->flags &= ~FT_GLYPH_OWN_BITMAP; 127 } 128 129 if ( ft_glyphslot_preset_bitmap( slot, mode, origin ) ) 130 { 131 error = FT_THROW( Raster_Overflow ); 132 goto Exit; 133 } 134 135 /* allocate new one */ 136 if ( FT_ALLOC_MULT( bitmap->buffer, bitmap->rows, bitmap->pitch ) ) 137 goto Exit; 138 139 slot->internal->flags |= FT_GLYPH_OWN_BITMAP; 140 141 x_shift = -slot->bitmap_left * 64; 142 y_shift = ( (FT_Int)bitmap->rows - slot->bitmap_top ) * 64; 143 144 if ( origin ) 145 { 146 x_shift += origin->x; 147 y_shift += origin->y; 148 } 149 150 /* translate outline to render it into the bitmap */ 151 if ( x_shift || y_shift ) 152 FT_Outline_Translate( outline, x_shift, y_shift ); 153 154 /* set up parameters */ 155 params.target = bitmap; 156 params.source = outline; 157 params.flags = FT_RASTER_FLAG_DEFAULT; 158 159 /* render outline into the bitmap */ 160 error = render->raster_render( render->raster, ¶ms ); 161 162 Exit: 163 if ( !error ) 164 /* everything is fine; the glyph is now officially a bitmap */ 165 slot->format = FT_GLYPH_FORMAT_BITMAP; 166 else if ( slot->internal->flags & FT_GLYPH_OWN_BITMAP ) 167 { 168 FT_FREE( bitmap->buffer ); 169 slot->internal->flags &= ~FT_GLYPH_OWN_BITMAP; 170 } 171 172 if ( x_shift || y_shift ) 173 FT_Outline_Translate( outline, -x_shift, -y_shift ); 174 175 return error; 176 } 177 178 179 FT_DEFINE_RENDERER( 180 ft_raster1_renderer_class, 181 182 FT_MODULE_RENDERER, 183 sizeof ( FT_RendererRec ), 184 185 "raster1", 186 0x10000L, 187 0x20000L, 188 189 NULL, /* module specific interface */ 190 191 (FT_Module_Constructor)ft_raster1_init, /* module_init */ 192 (FT_Module_Destructor) NULL, /* module_done */ 193 (FT_Module_Requester) NULL, /* get_interface */ 194 195 FT_GLYPH_FORMAT_OUTLINE, 196 197 (FT_Renderer_RenderFunc) ft_raster1_render, /* render_glyph */ 198 (FT_Renderer_TransformFunc)ft_raster1_transform, /* transform_glyph */ 199 (FT_Renderer_GetCBoxFunc) ft_raster1_get_cbox, /* get_glyph_cbox */ 200 (FT_Renderer_SetModeFunc) ft_raster1_set_mode, /* set_mode */ 201 202 (FT_Raster_Funcs*)&ft_standard_raster /* raster_class */ 203 ) 204 205 206 /* END */ 207