freetype/src/truetype/rules.mk
Infinality 79e36baebb [truetype] Support subpixel hinting.
This is the large, famous `Infinality' patch to support ClearType
bytecode which has been available from
http://www.infinality.net/blog/ for some time, and which has been
refined over the last years.  While still experimental, it is now
mature enough to be included directly into FreeType.

Most of the code is based on the ClearType whitepaper written by
Greg Hitchcock

  http://www.microsoft.com/typography/cleartype/truetypecleartype.aspx

which gives a detailed overview of the necessary changes to the
Microsoft rasterizer so that older fonts are supported.  However, a
lot of details are still missing, and this patches provides a
framework to easily handle rendering issues down to the glyph level
of certain fonts.

Note that ClearType support is not completely implemented!  In
particular, full support for the options `compatible_widths',
`symmetrical_smoothing, and `bgr' (via the GETINFO bytecode
instruction) is missing.

* src/truetype/ttsubpix.c: New file, providing code to handle
`tweaks', this is, rules for certain glyphs in certain fonts
(including wildcards) which need a special treatment.

* src/truetype/ttsubpix.h: New file, holding the tweaking rules.

* include/freetype/config/ftoption.h, src/devel/ftoption.h
(TT_CONFIG_OPTION_SUBPIXEL_HINTING): New macro.

* include/freetype/internal/ftobjs.h (FT_PIX_FLOOR_GRID,
FT_PIX_ROUND_GRID, FT_PIX_CEIL_GRID): New macros.

* src/truetype/truetype.c [TT_USE_BYTECODE_INTERPRETER]: Include
`ttsubpix.c'.

* src/truetype/ttgload.c: Include `ttsubpix.h'.
[All changes below are guarded by TT_CONFIG_OPTION_SUBPIXEL_HINTING.]

(tt_get_metrics): Set tweak flags.
(TT_Hint_Glyph): Call `FT_Outline_EmboldenXY' if necessary.
(TT_Process_Simple_Glyph): Compensate emboldening if necessary.
(compute_glyph_metrics): Handle `compatible widths' option.
(tt_loader_init): Handle ClearType GETINFO information bits.

* src/truetype/rules.mk (TT_DRC_SRC): Updated.

* src/truetype/ttinterp.c: Include `ttsubpix.h'.
[Where necessary, changes below are guarded by
TT_CONFIG_OPTION_SUBPIXEL_HINTING.]

(Direct_Move, Direct_Move_X): Extended.
(Round_None, Round_To_Grid, Round_To_Half_Grid, Round_Down_To_Grid,
Round_Up_To_Grid, Round_To_Double_Grid, Round_Super, Round_Super_45,
SetSuperRound): Add parameter to handle the number of grid lines per
pixel.
(SET_SuperRound, ROUND_None, CUR_Func_round): Updated.
(DO_SROUND, DOS45ROUND, DO_ODD, DO_EVEN): Updated.
(DO_ROUND, DO_NROUND): Updated.
(DO_RS): Take care of `Typeman' bytecode patterns.
(Ins_FDEF): Add some debugging code.  Commented out.
(Ins_ENDF): Restore state.
(Ins_CALL, Ins_LOOPCALL): Handle inline delta functions.
(Ins_MD): Handle `Vacuform' rounds.
(Move_Zp2_Point, Ins_SHPIX, Ins_MSIRP, Ins_MDAP, Ins_MIAP,
Ins_MDRP, Ins_MIRP): Handle tweaks.
(Ins_ALIGNRP): Add tweak guard.
(Ins_IUP, Ins_DELTAP): Handle tweaks.
(Ins_GETINFO): Handle new ClearType bits.
(TT_RunIns): Handle tweaks.

* src/truetype/ttinterp.h: Updated.
(SPH_TweakRule, SPH_ScaleRule): New structures for tweaks.
(TT_ExecContextRec): Add members for subpixel hinting support.

* src/truetype/ttobjs.h (TT_DefRecord): Add `inline_delta' member.
2012-06-18 10:36:06 +02:00

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1.8 KiB
Makefile

#
# FreeType 2 TrueType driver configuration rules
#
# Copyright 1996-2001, 2003-2004, 2011-2012 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.
# TrueType driver directory
#
TT_DIR := $(SRC_DIR)/truetype
# compilation flags for the driver
#
TT_COMPILE := $(FT_COMPILE) $I$(subst /,$(COMPILER_SEP),$(TT_DIR))
# TrueType driver sources (i.e., C files)
#
TT_DRV_SRC := $(TT_DIR)/ttdriver.c \
$(TT_DIR)/ttgload.c \
$(TT_DIR)/ttgxvar.c \
$(TT_DIR)/ttinterp.c \
$(TT_DIR)/ttobjs.c \
$(TT_DIR)/ttpic.c \
$(TT_DIR)/ttpload.c \
$(TT_DIR)/ttsubpix.c
# TrueType driver headers
#
TT_DRV_H := $(TT_DRV_SRC:%.c=%.h) \
$(TT_DIR)/tterrors.h
# TrueType driver object(s)
#
# TT_DRV_OBJ_M is used during `multi' builds
# TT_DRV_OBJ_S is used during `single' builds
#
TT_DRV_OBJ_M := $(TT_DRV_SRC:$(TT_DIR)/%.c=$(OBJ_DIR)/%.$O)
TT_DRV_OBJ_S := $(OBJ_DIR)/truetype.$O
# TrueType driver source file for single build
#
TT_DRV_SRC_S := $(TT_DIR)/truetype.c
# TrueType driver - single object
#
$(TT_DRV_OBJ_S): $(TT_DRV_SRC_S) $(TT_DRV_SRC) $(FREETYPE_H) $(TT_DRV_H)
$(TT_COMPILE) $T$(subst /,$(COMPILER_SEP),$@ $(TT_DRV_SRC_S))
# driver - multiple objects
#
$(OBJ_DIR)/%.$O: $(TT_DIR)/%.c $(FREETYPE_H) $(TT_DRV_H)
$(TT_COMPILE) $T$(subst /,$(COMPILER_SEP),$@ $<)
# update main driver object lists
#
DRV_OBJS_S += $(TT_DRV_OBJ_S)
DRV_OBJS_M += $(TT_DRV_OBJ_M)
# EOF