/src/freetype/src/smooth/ftsmooth.c
https://bitbucket.org/cabalistic/ogredeps/ · C · 504 lines · 336 code · 122 blank · 46 comment · 49 complexity · 9da7b26a585d878689b3b33cac362847 MD5 · raw file
- /***************************************************************************/
- /* */
- /* ftsmooth.c */
- /* */
- /* Anti-aliasing renderer interface (body). */
- /* */
- /* Copyright 2000-2006, 2009-2012 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 "ftspic.h"
- #include "ftsmerrs.h"
- /* initialize renderer -- init its raster */
- static FT_Error
- ft_smooth_init( FT_Renderer render )
- {
- FT_Library library = FT_MODULE_LIBRARY( render );
- render->clazz->raster_class->raster_reset( render->raster,
- library->raster_pool,
- library->raster_pool_size );
- 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 = Smooth_Err_Ok;
- if ( slot->format != render->glyph_format )
- {
- error = Smooth_Err_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_MEM_ZERO( cbox, sizeof ( *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_Outline* outline = NULL;
- FT_BBox cbox;
- FT_Pos width, height, pitch;
- #ifndef FT_CONFIG_OPTION_SUBPIXEL_RENDERING
- FT_Pos height_org, width_org;
- #endif
- FT_Bitmap* bitmap;
- FT_Memory memory;
- FT_Int hmul = mode == FT_RENDER_MODE_LCD;
- FT_Int vmul = mode == FT_RENDER_MODE_LCD_V;
- FT_Pos x_shift, y_shift, x_left, y_top;
- FT_Raster_Params params;
- /* check glyph image format */
- if ( slot->format != render->glyph_format )
- {
- error = Smooth_Err_Invalid_Argument;
- goto Exit;
- }
- /* check mode */
- if ( mode != required_mode )
- return Smooth_Err_Cannot_Render_Glyph;
- outline = &slot->outline;
- /* translate the outline to the new origin if needed */
- if ( origin )
- FT_Outline_Translate( outline, origin->x, origin->y );
- /* compute the control box, and grid fit it */
- FT_Outline_Get_CBox( outline, &cbox );
- cbox.xMin = FT_PIX_FLOOR( cbox.xMin );
- cbox.yMin = FT_PIX_FLOOR( cbox.yMin );
- cbox.xMax = FT_PIX_CEIL( cbox.xMax );
- cbox.yMax = FT_PIX_CEIL( cbox.yMax );
- if ( cbox.xMin < 0 && cbox.xMax > FT_INT_MAX + cbox.xMin )
- {
- FT_ERROR(( "ft_smooth_render_generic: glyph too large:"
- " xMin = %d, xMax = %d\n",
- cbox.xMin >> 6, cbox.xMax >> 6 ));
- return Smooth_Err_Raster_Overflow;
- }
- else
- width = ( cbox.xMax - cbox.xMin ) >> 6;
- if ( cbox.yMin < 0 && cbox.yMax > FT_INT_MAX + cbox.yMin )
- {
- FT_ERROR(( "ft_smooth_render_generic: glyph too large:"
- " yMin = %d, yMax = %d\n",
- cbox.yMin >> 6, cbox.yMax >> 6 ));
- return Smooth_Err_Raster_Overflow;
- }
- else
- height = ( cbox.yMax - cbox.yMin ) >> 6;
- bitmap = &slot->bitmap;
- memory = render->root.memory;
- #ifndef FT_CONFIG_OPTION_SUBPIXEL_RENDERING
- width_org = width;
- height_org = height;
- #endif
- /* release old bitmap buffer */
- if ( slot->internal->flags & FT_GLYPH_OWN_BITMAP )
- {
- FT_FREE( bitmap->buffer );
- slot->internal->flags &= ~FT_GLYPH_OWN_BITMAP;
- }
- /* allocate new one */
- pitch = width;
- if ( hmul )
- {
- width = width * 3;
- pitch = FT_PAD_CEIL( width, 4 );
- }
- if ( vmul )
- height *= 3;
- x_shift = (FT_Int) cbox.xMin;
- y_shift = (FT_Int) cbox.yMin;
- x_left = (FT_Int)( cbox.xMin >> 6 );
- y_top = (FT_Int)( cbox.yMax >> 6 );
- #ifdef FT_CONFIG_OPTION_SUBPIXEL_RENDERING
- if ( slot->library->lcd_filter_func )
- {
- FT_Int extra = slot->library->lcd_extra;
- if ( hmul )
- {
- x_shift -= 64 * ( extra >> 1 );
- width += 3 * extra;
- pitch = FT_PAD_CEIL( width, 4 );
- x_left -= extra >> 1;
- }
- if ( vmul )
- {
- y_shift -= 64 * ( extra >> 1 );
- height += 3 * extra;
- y_top += extra >> 1;
- }
- }
- #endif
- #if FT_UINT_MAX > 0xFFFFU
- /* Required check is ( pitch * height < FT_ULONG_MAX ), */
- /* but we care realistic cases only. Always pitch <= width. */
- if ( width > 0x7FFF || height > 0x7FFF )
- {
- FT_ERROR(( "ft_smooth_render_generic: glyph too large: %u x %u\n",
- width, height ));
- return Smooth_Err_Raster_Overflow;
- }
- #endif
- bitmap->pixel_mode = FT_PIXEL_MODE_GRAY;
- bitmap->num_grays = 256;
- bitmap->width = width;
- bitmap->rows = height;
- bitmap->pitch = pitch;
- /* translate outline to render it into the bitmap */
- FT_Outline_Translate( outline, -x_shift, -y_shift );
- if ( FT_ALLOC( bitmap->buffer, (FT_ULong)pitch * height ) )
- goto Exit;
- slot->internal->flags |= FT_GLYPH_OWN_BITMAP;
- /* 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 ( slot->library->lcd_filter_func )
- slot->library->lcd_filter_func( bitmap, mode, slot->library );
- #else /* !FT_CONFIG_OPTION_SUBPIXEL_RENDERING */
- /* render outline into bitmap */
- error = render->raster_render( render->raster, ¶ms );
- /* expand it horizontally */
- if ( hmul )
- {
- FT_Byte* line = bitmap->buffer;
- FT_UInt hh;
- for ( hh = height_org; hh > 0; hh--, line += pitch )
- {
- FT_UInt xx;
- FT_Byte* end = line + width;
- for ( xx = width_org; xx > 0; xx-- )
- {
- FT_UInt pixel = line[xx-1];
- end[-3] = (FT_Byte)pixel;
- end[-2] = (FT_Byte)pixel;
- end[-1] = (FT_Byte)pixel;
- end -= 3;
- }
- }
- }
- /* expand it vertically */
- if ( vmul )
- {
- FT_Byte* read = bitmap->buffer + ( height - height_org ) * pitch;
- FT_Byte* write = bitmap->buffer;
- FT_UInt hh;
- for ( hh = height_org; hh > 0; hh-- )
- {
- ft_memcpy( write, read, pitch );
- write += pitch;
- ft_memcpy( write, read, pitch );
- write += pitch;
- ft_memcpy( write, read, pitch );
- write += pitch;
- read += pitch;
- }
- }
- #endif /* !FT_CONFIG_OPTION_SUBPIXEL_RENDERING */
- FT_Outline_Translate( outline, x_shift, y_shift );
- /*
- * XXX: on 16bit system, we return an error for huge bitmap
- * to prevent an overflow.
- */
- if ( x_left > FT_INT_MAX || y_top > FT_INT_MAX )
- return Smooth_Err_Invalid_Pixel_Size;
- if ( error )
- goto Exit;
- slot->format = FT_GLYPH_FORMAT_BITMAP;
- slot->bitmap_left = (FT_Int)x_left;
- slot->bitmap_top = (FT_Int)y_top;
- Exit:
- if ( outline && origin )
- FT_Outline_Translate( outline, -origin->x, -origin->y );
- 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 )
- {
- FT_Error error;
- error = ft_smooth_render_generic( render, slot, mode, origin,
- FT_RENDER_MODE_LCD );
- if ( !error )
- slot->bitmap.pixel_mode = FT_PIXEL_MODE_LCD;
- return error;
- }
- /* 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 )
- {
- FT_Error error;
- error = ft_smooth_render_generic( render, slot, mode, origin,
- FT_RENDER_MODE_LCD_V );
- if ( !error )
- slot->bitmap.pixel_mode = FT_PIXEL_MODE_LCD_V;
- return error;
- }
- FT_DEFINE_RENDERER( ft_smooth_renderer_class,
- FT_MODULE_RENDERER,
- sizeof ( FT_RendererRec ),
- "smooth",
- 0x10000L,
- 0x20000L,
- 0, /* module specific interface */
- (FT_Module_Constructor)ft_smooth_init,
- (FT_Module_Destructor) 0,
- (FT_Module_Requester) 0
- ,
- FT_GLYPH_FORMAT_OUTLINE,
- (FT_Renderer_RenderFunc) ft_smooth_render,
- (FT_Renderer_TransformFunc)ft_smooth_transform,
- (FT_Renderer_GetCBoxFunc) ft_smooth_get_cbox,
- (FT_Renderer_SetModeFunc) ft_smooth_set_mode,
- (FT_Raster_Funcs*) &FT_GRAYS_RASTER_GET
- )
- FT_DEFINE_RENDERER( ft_smooth_lcd_renderer_class,
- FT_MODULE_RENDERER,
- sizeof ( FT_RendererRec ),
- "smooth-lcd",
- 0x10000L,
- 0x20000L,
- 0, /* module specific interface */
- (FT_Module_Constructor)ft_smooth_init,
- (FT_Module_Destructor) 0,
- (FT_Module_Requester) 0
- ,
- FT_GLYPH_FORMAT_OUTLINE,
- (FT_Renderer_RenderFunc) ft_smooth_render_lcd,
- (FT_Renderer_TransformFunc)ft_smooth_transform,
- (FT_Renderer_GetCBoxFunc) ft_smooth_get_cbox,
- (FT_Renderer_SetModeFunc) ft_smooth_set_mode,
- (FT_Raster_Funcs*) &FT_GRAYS_RASTER_GET
- )
- FT_DEFINE_RENDERER( ft_smooth_lcdv_renderer_class,
- FT_MODULE_RENDERER,
- sizeof ( FT_RendererRec ),
- "smooth-lcdv",
- 0x10000L,
- 0x20000L,
- 0, /* module specific interface */
- (FT_Module_Constructor)ft_smooth_init,
- (FT_Module_Destructor) 0,
- (FT_Module_Requester) 0
- ,
- FT_GLYPH_FORMAT_OUTLINE,
- (FT_Renderer_RenderFunc) ft_smooth_render_lcd_v,
- (FT_Renderer_TransformFunc)ft_smooth_transform,
- (FT_Renderer_GetCBoxFunc) ft_smooth_get_cbox,
- (FT_Renderer_SetModeFunc) ft_smooth_set_mode,
- (FT_Raster_Funcs*) &FT_GRAYS_RASTER_GET
- )
- /* END */