ref: c13635ee4bf34e621816cd09d7f2baf918e20af8
dir: /src/smooth/ftsmooth.c/
/**************************************************************************** * * ftsmooth.c * * Anti-aliasing renderer interface (body). * * Copyright 2000-2018 by * David Turner, Robert Wilhelm, and Werner Lemberg. * * This file is part of the FreeType project, and may only be used, * modified, and distributed under the terms of the FreeType project * license, LICENSE.TXT. By continuing to use, modify, or distribute * this file you indicate that you have read the license and * understand and accept it fully. * */ #include <ft2build.h> #include FT_INTERNAL_DEBUG_H #include FT_INTERNAL_OBJECTS_H #include FT_OUTLINE_H #include "ftsmooth.h" #include "ftgrays.h" #include "ftsmerrs.h" /* initialize renderer -- init its raster */ static FT_Error ft_smooth_init( FT_Renderer render ) { #ifndef FT_CONFIG_OPTION_SUBPIXEL_RENDERING FT_Vector* sub = render->root.library->lcd_geometry; /* set up default subpixel geometry for striped RGB panels. */ sub[0].x = -21; sub[0].y = 0; sub[1].x = 0; sub[1].y = 0; sub[2].x = 21; sub[2].y = 0; #endif render->clazz->raster_class->raster_reset( render->raster, NULL, 0 ); return 0; } /* sets render-specific mode */ static FT_Error ft_smooth_set_mode( FT_Renderer render, FT_ULong mode_tag, FT_Pointer data ) { /* we simply pass it to the raster */ return render->clazz->raster_class->raster_set_mode( render->raster, mode_tag, data ); } /* transform a given glyph image */ static FT_Error ft_smooth_transform( FT_Renderer render, FT_GlyphSlot slot, const FT_Matrix* matrix, const FT_Vector* delta ) { FT_Error error = FT_Err_Ok; if ( slot->format != render->glyph_format ) { error = FT_THROW( Invalid_Argument ); goto Exit; } if ( matrix ) FT_Outline_Transform( &slot->outline, matrix ); if ( delta ) FT_Outline_Translate( &slot->outline, delta->x, delta->y ); Exit: return error; } /* return the glyph's control box */ static void ft_smooth_get_cbox( FT_Renderer render, FT_GlyphSlot slot, FT_BBox* cbox ) { FT_ZERO( cbox ); if ( slot->format == render->glyph_format ) FT_Outline_Get_CBox( &slot->outline, cbox ); } /* convert a slot's glyph image into a bitmap */ static FT_Error ft_smooth_render_generic( FT_Renderer render, FT_GlyphSlot slot, FT_Render_Mode mode, const FT_Vector* origin, FT_Render_Mode required_mode ) { FT_Error error = FT_Err_Ok; FT_Outline* outline = &slot->outline; FT_Bitmap* bitmap = &slot->bitmap; FT_Memory memory = render->root.memory; FT_Pos x_shift = 0; FT_Pos y_shift = 0; FT_Int hmul = ( mode == FT_RENDER_MODE_LCD ); FT_Int vmul = ( mode == FT_RENDER_MODE_LCD_V ); FT_Raster_Params params; /* check glyph image format */ if ( slot->format != render->glyph_format ) { error = FT_THROW( Invalid_Argument ); goto Exit; } /* check mode */ if ( mode != required_mode ) { error = FT_THROW( Cannot_Render_Glyph ); goto Exit; } /* release old bitmap buffer */ if ( slot->internal->flags & FT_GLYPH_OWN_BITMAP ) { FT_FREE( bitmap->buffer ); slot->internal->flags &= ~FT_GLYPH_OWN_BITMAP; } if ( ft_glyphslot_preset_bitmap( slot, mode, origin ) ) { error = FT_THROW( Raster_Overflow ); goto Exit; } /* allocate new one */ if ( FT_ALLOC_MULT( bitmap->buffer, bitmap->rows, bitmap->pitch ) ) goto Exit; slot->internal->flags |= FT_GLYPH_OWN_BITMAP; x_shift = 64 * -slot->bitmap_left; y_shift = 64 * -slot->bitmap_top; if ( bitmap->pixel_mode == FT_PIXEL_MODE_LCD_V ) y_shift += 64 * (FT_Int)bitmap->rows / 3; else y_shift += 64 * (FT_Int)bitmap->rows; if ( origin ) { x_shift += origin->x; y_shift += origin->y; } /* translate outline to render it into the bitmap */ if ( x_shift || y_shift ) FT_Outline_Translate( outline, x_shift, y_shift ); /* set up parameters */ params.target = bitmap; params.source = outline; params.flags = FT_RASTER_FLAG_AA; #ifdef FT_CONFIG_OPTION_SUBPIXEL_RENDERING /* implode outline if needed */ { FT_Vector* points = outline->points; FT_Vector* points_end = points + outline->n_points; FT_Vector* vec; if ( hmul ) for ( vec = points; vec < points_end; vec++ ) vec->x *= 3; if ( vmul ) for ( vec = points; vec < points_end; vec++ ) vec->y *= 3; } /* render outline into the bitmap */ error = render->raster_render( render->raster, ¶ms ); /* deflate outline if needed */ { FT_Vector* points = outline->points; FT_Vector* points_end = points + outline->n_points; FT_Vector* vec; if ( hmul ) for ( vec = points; vec < points_end; vec++ ) vec->x /= 3; if ( vmul ) for ( vec = points; vec < points_end; vec++ ) vec->y /= 3; } if ( error ) goto Exit; /* finally apply filtering */ if ( hmul || vmul ) { FT_Byte* lcd_weights; FT_Bitmap_LcdFilterFunc lcd_filter_func; /* Per-face LCD filtering takes priority if set up. */ if ( slot->face && slot->face->internal->lcd_filter_func ) { lcd_weights = slot->face->internal->lcd_weights; lcd_filter_func = slot->face->internal->lcd_filter_func; } else { lcd_weights = slot->library->lcd_weights; lcd_filter_func = slot->library->lcd_filter_func; } if ( lcd_filter_func ) lcd_filter_func( bitmap, mode, lcd_weights ); } #else /* !FT_CONFIG_OPTION_SUBPIXEL_RENDERING */ if ( hmul ) /* lcd */ { FT_Byte* line; FT_Byte* temp = NULL; FT_UInt i, j; unsigned int height = bitmap->rows; unsigned int width = bitmap->width; int pitch = bitmap->pitch; FT_Vector* sub = slot->library->lcd_geometry; /* Render 3 separate monochrome bitmaps, shifting the outline. */ width /= 3; FT_Outline_Translate( outline, -sub[0].x, -sub[0].y ); error = render->raster_render( render->raster, ¶ms ); if ( error ) goto Exit; bitmap->buffer += width; FT_Outline_Translate( outline, sub[0].x - sub[1].x, sub[0].y - sub[1].y ); error = render->raster_render( render->raster, ¶ms ); bitmap->buffer -= width; if ( error ) goto Exit; bitmap->buffer += 2 * width; FT_Outline_Translate( outline, sub[1].x - sub[2].x, sub[1].y - sub[2].y ); error = render->raster_render( render->raster, ¶ms ); bitmap->buffer -= 2 * width; if ( error ) goto Exit; x_shift -= sub[2].x; y_shift -= sub[2].y; /* XXX: Rearrange the bytes according to FT_PIXEL_MODE_LCD. */ /* XXX: It is more efficient to render every third byte above. */ if ( FT_ALLOC( temp, (FT_ULong)pitch ) ) goto Exit; for ( i = 0; i < height; i++ ) { line = bitmap->buffer + i * (FT_ULong)pitch; for ( j = 0; j < width; j++ ) { temp[3 * j ] = line[j]; temp[3 * j + 1] = line[j + width]; temp[3 * j + 2] = line[j + width + width]; } FT_MEM_COPY( line, temp, pitch ); } FT_FREE( temp ); } else if ( vmul ) /* lcd_v */ { int pitch = bitmap->pitch; FT_Vector* sub = slot->library->lcd_geometry; /* Render 3 separate monochrome bitmaps, shifting the outline. */ /* Notice that the subpixel geometry vectors are rotated. */ /* Triple the pitch to render on each third row. */ bitmap->pitch *= 3; bitmap->rows /= 3; FT_Outline_Translate( outline, -sub[0].y, sub[0].x ); error = render->raster_render( render->raster, ¶ms ); if ( error ) goto Exit; bitmap->buffer += pitch; FT_Outline_Translate( outline, sub[0].y - sub[1].y, sub[1].x - sub[0].x ); error = render->raster_render( render->raster, ¶ms ); bitmap->buffer -= pitch; if ( error ) goto Exit; bitmap->buffer += 2 * pitch; FT_Outline_Translate( outline, sub[1].y - sub[2].y, sub[2].x - sub[1].x ); error = render->raster_render( render->raster, ¶ms ); bitmap->buffer -= 2 * pitch; if ( error ) goto Exit; x_shift -= sub[2].y; y_shift += sub[2].x; bitmap->pitch /= 3; bitmap->rows *= 3; } else /* grayscale */ error = render->raster_render( render->raster, ¶ms ); #endif /* !FT_CONFIG_OPTION_SUBPIXEL_RENDERING */ Exit: if ( !error ) { /* everything is fine; the glyph is now officially a bitmap */ slot->format = FT_GLYPH_FORMAT_BITMAP; } else if ( slot->internal->flags & FT_GLYPH_OWN_BITMAP ) { FT_FREE( bitmap->buffer ); slot->internal->flags &= ~FT_GLYPH_OWN_BITMAP; } if ( x_shift || y_shift ) FT_Outline_Translate( outline, -x_shift, -y_shift ); return error; } /* convert a slot's glyph image into a bitmap */ static FT_Error ft_smooth_render( FT_Renderer render, FT_GlyphSlot slot, FT_Render_Mode mode, const FT_Vector* origin ) { if ( mode == FT_RENDER_MODE_LIGHT ) mode = FT_RENDER_MODE_NORMAL; return ft_smooth_render_generic( render, slot, mode, origin, FT_RENDER_MODE_NORMAL ); } /* convert a slot's glyph image into a horizontal LCD bitmap */ static FT_Error ft_smooth_render_lcd( FT_Renderer render, FT_GlyphSlot slot, FT_Render_Mode mode, const FT_Vector* origin ) { return ft_smooth_render_generic( render, slot, mode, origin, FT_RENDER_MODE_LCD ); } /* convert a slot's glyph image into a vertical LCD bitmap */ static FT_Error ft_smooth_render_lcd_v( FT_Renderer render, FT_GlyphSlot slot, FT_Render_Mode mode, const FT_Vector* origin ) { return ft_smooth_render_generic( render, slot, mode, origin, FT_RENDER_MODE_LCD_V ); } FT_DEFINE_RENDERER( ft_smooth_renderer_class, FT_MODULE_RENDERER, sizeof ( FT_RendererRec ), "smooth", 0x10000L, 0x20000L, NULL, /* module specific interface */ (FT_Module_Constructor)ft_smooth_init, /* module_init */ (FT_Module_Destructor) NULL, /* module_done */ (FT_Module_Requester) NULL, /* get_interface */ FT_GLYPH_FORMAT_OUTLINE, (FT_Renderer_RenderFunc) ft_smooth_render, /* render_glyph */ (FT_Renderer_TransformFunc)ft_smooth_transform, /* transform_glyph */ (FT_Renderer_GetCBoxFunc) ft_smooth_get_cbox, /* get_glyph_cbox */ (FT_Renderer_SetModeFunc) ft_smooth_set_mode, /* set_mode */ (FT_Raster_Funcs*)&ft_grays_raster /* raster_class */ ) FT_DEFINE_RENDERER( ft_smooth_lcd_renderer_class, FT_MODULE_RENDERER, sizeof ( FT_RendererRec ), "smooth-lcd", 0x10000L, 0x20000L, NULL, /* module specific interface */ (FT_Module_Constructor)ft_smooth_init, /* module_init */ (FT_Module_Destructor) NULL, /* module_done */ (FT_Module_Requester) NULL, /* get_interface */ FT_GLYPH_FORMAT_OUTLINE, (FT_Renderer_RenderFunc) ft_smooth_render_lcd, /* render_glyph */ (FT_Renderer_TransformFunc)ft_smooth_transform, /* transform_glyph */ (FT_Renderer_GetCBoxFunc) ft_smooth_get_cbox, /* get_glyph_cbox */ (FT_Renderer_SetModeFunc) ft_smooth_set_mode, /* set_mode */ (FT_Raster_Funcs*)&ft_grays_raster /* raster_class */ ) FT_DEFINE_RENDERER( ft_smooth_lcdv_renderer_class, FT_MODULE_RENDERER, sizeof ( FT_RendererRec ), "smooth-lcdv", 0x10000L, 0x20000L, NULL, /* module specific interface */ (FT_Module_Constructor)ft_smooth_init, /* module_init */ (FT_Module_Destructor) NULL, /* module_done */ (FT_Module_Requester) NULL, /* get_interface */ FT_GLYPH_FORMAT_OUTLINE, (FT_Renderer_RenderFunc) ft_smooth_render_lcd_v, /* render_glyph */ (FT_Renderer_TransformFunc)ft_smooth_transform, /* transform_glyph */ (FT_Renderer_GetCBoxFunc) ft_smooth_get_cbox, /* get_glyph_cbox */ (FT_Renderer_SetModeFunc) ft_smooth_set_mode, /* set_mode */ (FT_Raster_Funcs*)&ft_grays_raster /* raster_class */ ) /* END */