--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/misc/libfreetype/src/smooth/ftsmooth.c Mon Apr 25 01:46:54 2011 +0200
@@ -0,0 +1,499 @@
+/***************************************************************************/
+/* */
+/* ftsmooth.c */
+/* */
+/* Anti-aliasing renderer interface (body). */
+/* */
+/* Copyright 2000-2001, 2002, 2003, 2004, 2005, 2006, 2009, 2010 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_UInt width, height, height_org, width_org, pitch;
+ 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 = (FT_UInt)( ( 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 = (FT_UInt)( ( cbox.yMax - cbox.yMin ) >> 6 );
+
+ bitmap = &slot->bitmap;
+ memory = render->root.memory;
+
+ width_org = width;
+ height_org = height;
+
+ /* 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 > 0x7FFFU || height > 0x7FFFU )
+ {
+ 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 */