| author | eckhart.koppen@nokia.com |
| Wed, 31 Mar 2010 11:06:36 +0300 | |
| changeset 7 | f7bc934e204c |
| parent 0 | 1918ee327afb |
| child 33 | 3e2da88830cd |
| permissions | -rw-r--r-- |
| 0 | 1 |
/**************************************************************************** |
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** |
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f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
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changeset
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). |
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** All rights reserved. |
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** Contact: Nokia Corporation (qt-info@nokia.com) |
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** |
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** This file is part of the QtGui module of the Qt Toolkit. |
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** |
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** $QT_BEGIN_LICENSE:LGPL$ |
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** No Commercial Usage |
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** This file contains pre-release code and may not be distributed. |
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** You may use this file in accordance with the terms and conditions |
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** contained in the Technology Preview License Agreement accompanying |
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** this package. |
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** |
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** GNU Lesser General Public License Usage |
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** Alternatively, this file may be used under the terms of the GNU Lesser |
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** General Public License version 2.1 as published by the Free Software |
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** Foundation and appearing in the file LICENSE.LGPL included in the |
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** packaging of this file. Please review the following information to |
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** ensure the GNU Lesser General Public License version 2.1 requirements |
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. |
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** |
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** In addition, as a special exception, Nokia gives you certain additional |
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** rights. These rights are described in the Nokia Qt LGPL Exception |
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. |
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** |
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** If you have questions regarding the use of this file, please contact |
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** Nokia at qt-info@nokia.com. |
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** |
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** |
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** |
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** |
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** |
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** |
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** |
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** |
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** $QT_END_LICENSE$ |
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** |
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****************************************************************************/ |
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/***************************************************************************/ |
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/* */ |
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/* ftimage.h */ |
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/* */ |
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/* FreeType glyph image formats and default raster interface */ |
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/* (specification). */ |
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/* */ |
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/* Copyright 1996-2001, 2002, 2003, 2004 by */ |
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/* David Turner, Robert Wilhelm, and Werner Lemberg. */ |
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/* */ |
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/* This file is part of the FreeType project, and may only be used, */ |
|
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/* modified, and distributed under the terms of the FreeType project */ |
|
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/* license, LICENSE.TXT. By continuing to use, modify, or distribute */ |
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/* this file you indicate that you have read the license and */ |
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/* understand and accept it fully. */ |
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/* */ |
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/***************************************************************************/ |
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||
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/*************************************************************************/ |
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/* */ |
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/* Note: A `raster' is simply a scan-line converter, used to render */ |
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/* QT_FT_Outlines into QT_FT_Bitmaps. */ |
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/* */ |
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/*************************************************************************/ |
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#ifndef __QT_FTIMAGE_H__ |
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#define __QT_FTIMAGE_H__ |
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/* |
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// W A R N I N G |
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// ------------- |
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// |
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// This file is not part of the Qt API. It exists purely as an |
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// implementation detail. This header file may change from version to |
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// version without notice, or even be removed. |
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// |
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// We mean it. |
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*/ |
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QT_FT_BEGIN_HEADER |
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/*************************************************************************/ |
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/* */ |
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/* <Section> */ |
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/* basic_types */ |
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/* */ |
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/*************************************************************************/ |
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/*************************************************************************/ |
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/* */ |
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/* <Type> */ |
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/* QT_FT_Pos */ |
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/* */ |
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/* <Description> */ |
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/* The type QT_FT_Pos is a 32-bit integer used to store vectorial */ |
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/* coordinates. Depending on the context, these can represent */ |
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/* distances in integer font units, or 16,16, or 26.6 fixed float */ |
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/* pixel coordinates. */ |
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/* */ |
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typedef signed long QT_FT_Pos; |
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/*************************************************************************/ |
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/* */ |
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/* <Struct> */ |
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/* QT_FT_Vector */ |
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/* */ |
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/* <Description> */ |
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/* A simple structure used to store a 2D vector; coordinates are of */ |
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/* the QT_FT_Pos type. */ |
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/* */ |
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/* <Fields> */ |
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/* x :: The horizontal coordinate. */ |
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/* y :: The vertical coordinate. */ |
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/* */ |
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typedef struct QT_FT_Vector_ |
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{
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QT_FT_Pos x; |
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QT_FT_Pos y; |
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} QT_FT_Vector; |
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/*************************************************************************/ |
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/* */ |
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/* <Struct> */ |
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/* QT_FT_BBox */ |
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/* */ |
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/* <Description> */ |
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/* A structure used to hold an outline's bounding box, i.e., the */ |
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/* coordinates of its extrema in the horizontal and vertical */ |
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/* directions. */ |
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/* */ |
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/* <Fields> */ |
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/* xMin :: The horizontal minimum (left-most). */ |
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/* */ |
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/* yMin :: The vertical minimum (bottom-most). */ |
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/* */ |
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/* xMax :: The horizontal maximum (right-most). */ |
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/* */ |
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/* yMax :: The vertical maximum (top-most). */ |
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/* */ |
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typedef struct QT_FT_BBox_ |
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{
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QT_FT_Pos xMin, yMin; |
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QT_FT_Pos xMax, yMax; |
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} QT_FT_BBox; |
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/*************************************************************************/ |
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/* */ |
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/* <Enum> */ |
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/* QT_FT_Pixel_Mode */ |
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/* */ |
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/* <Description> */ |
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/* An enumeration type used to describe the format of pixels in a */ |
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/* given bitmap. Note that additional formats may be added in the */ |
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/* future. */ |
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/* */ |
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/* <Values> */ |
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/* QT_FT_PIXEL_MODE_NONE :: */ |
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/* Value 0 is reserved. */ |
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/* */ |
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/* QT_FT_PIXEL_MODE_MONO :: */ |
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/* A monochrome bitmap, using 1 bit per pixel. Note that pixels */ |
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/* are stored in most-significant order (MSB), which means that */ |
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/* the left-most pixel in a byte has value 128. */ |
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/* */ |
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/* QT_FT_PIXEL_MODE_GRAY :: */ |
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/* An 8-bit bitmap, generally used to represent anti-aliased glyph */ |
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/* images. Each pixel is stored in one byte. Note that the number */ |
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/* of value "gray" levels is stored in the `num_bytes' field of */ |
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/* the @QT_FT_Bitmap structure (it generally is 256). */ |
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/* */ |
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/* QT_FT_PIXEL_MODE_GRAY2 :: */ |
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/* A 2-bit/pixel bitmap, used to represent embedded anti-aliased */ |
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/* bitmaps in font files according to the OpenType specification. */ |
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/* We haven't found a single font using this format, however. */ |
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/* */ |
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/* QT_FT_PIXEL_MODE_GRAY4 :: */ |
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/* A 4-bit/pixel bitmap, used to represent embedded anti-aliased */ |
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/* bitmaps in font files according to the OpenType specification. */ |
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/* We haven't found a single font using this format, however. */ |
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/* */ |
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/* QT_FT_PIXEL_MODE_LCD :: */ |
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/* An 8-bit bitmap, used to represent RGB or BGR decimated glyph */ |
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/* images used for display on LCD displays; the bitmap's width is */ |
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/* three times wider than the original glyph image. See also */ |
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/* @QT_FT_RENDER_MODE_LCD. */ |
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/* */ |
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/* QT_FT_PIXEL_MODE_LCD_V :: */ |
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/* An 8-bit bitmap, used to represent RGB or BGR decimated glyph */ |
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/* images used for display on rotated LCD displays; the bitmap's */ |
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/* height is three times taller than the original glyph image. */ |
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/* See also @QT_FT_RENDER_MODE_LCD_V. */ |
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/* */ |
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typedef enum QT_FT_Pixel_Mode_ |
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{
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QT_FT_PIXEL_MODE_NONE = 0, |
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QT_FT_PIXEL_MODE_MONO, |
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QT_FT_PIXEL_MODE_GRAY, |
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QT_FT_PIXEL_MODE_GRAY2, |
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QT_FT_PIXEL_MODE_GRAY4, |
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QT_FT_PIXEL_MODE_LCD, |
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QT_FT_PIXEL_MODE_LCD_V, |
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QT_FT_PIXEL_MODE_MAX /* do not remove */ |
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} QT_FT_Pixel_Mode; |
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/*************************************************************************/ |
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/* */ |
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/* <Enum> */ |
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/* qt_ft_pixel_mode_xxx */ |
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/* */ |
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/* <Description> */ |
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/* A list of deprecated constants. Use the corresponding */ |
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/* @QT_FT_Pixel_Mode values instead. */ |
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/* */ |
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/* <Values> */ |
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/* qt_ft_pixel_mode_none :: see @QT_FT_PIXEL_MODE_NONE */ |
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/* qt_ft_pixel_mode_mono :: see @QT_FT_PIXEL_MODE_MONO */ |
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/* qt_ft_pixel_mode_grays :: see @QT_FT_PIXEL_MODE_GRAY */ |
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/* qt_ft_pixel_mode_pal2 :: see @QT_FT_PIXEL_MODE_GRAY2 */ |
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/* qt_ft_pixel_mode_pal4 :: see @QT_FT_PIXEL_MODE_GRAY4 */ |
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/* */ |
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#define qt_ft_pixel_mode_none QT_FT_PIXEL_MODE_NONE |
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#define qt_ft_pixel_mode_mono QT_FT_PIXEL_MODE_MONO |
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#define qt_ft_pixel_mode_grays QT_FT_PIXEL_MODE_GRAY |
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#define qt_ft_pixel_mode_pal2 QT_FT_PIXEL_MODE_GRAY2 |
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#define qt_ft_pixel_mode_pal4 QT_FT_PIXEL_MODE_GRAY4 |
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/* */ |
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#if 0 |
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/*************************************************************************/ |
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/* */ |
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/* <Enum> */ |
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/* QT_FT_Palette_Mode */ |
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/* */ |
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/* <Description> */ |
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/* THIS TYPE IS DEPRECATED. DO NOT USE IT! */ |
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/* */ |
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/* An enumeration type used to describe the format of a bitmap */ |
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/* palette, used with qt_ft_pixel_mode_pal4 and qt_ft_pixel_mode_pal8. */ |
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/* */ |
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/* <Fields> */ |
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/* qt_ft_palette_mode_rgb :: The palette is an array of 3-bytes RGB */ |
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/* records. */ |
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/* */ |
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/* qt_ft_palette_mode_rgba :: The palette is an array of 4-bytes RGBA */ |
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/* records. */ |
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/* */ |
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/* <Note> */ |
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/* As qt_ft_pixel_mode_pal2, pal4 and pal8 are currently unused by */ |
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/* FreeType, these types are not handled by the library itself. */ |
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/* */ |
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typedef enum QT_FT_Palette_Mode_ |
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{
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qt_ft_palette_mode_rgb = 0, |
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qt_ft_palette_mode_rgba, |
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qt_ft_palettte_mode_max /* do not remove */ |
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} QT_FT_Palette_Mode; |
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/* */ |
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#endif |
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/*************************************************************************/ |
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/* */ |
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/* <Struct> */ |
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/* QT_FT_Bitmap */ |
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/* */ |
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/* <Description> */ |
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/* A structure used to describe a bitmap or pixmap to the raster. */ |
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/* Note that we now manage pixmaps of various depths through the */ |
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/* `pixel_mode' field. */ |
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/* */ |
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/* <Fields> */ |
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/* rows :: The number of bitmap rows. */ |
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/* */ |
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/* width :: The number of pixels in bitmap row. */ |
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/* */ |
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/* pitch :: The pitch's absolute value is the number of bytes */ |
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/* taken by one bitmap row, including padding. */ |
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/* However, the pitch is positive when the bitmap has */ |
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/* a `down' flow, and negative when it has an `up' */ |
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/* flow. In all cases, the pitch is an offset to add */ |
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/* to a bitmap pointer in order to go down one row. */ |
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/* */ |
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/* buffer :: A typeless pointer to the bitmap buffer. This */ |
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/* value should be aligned on 32-bit boundaries in */ |
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/* most cases. */ |
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/* */ |
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/* num_grays :: This field is only used with */ |
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/* `QT_FT_PIXEL_MODE_GRAY'; it gives the number of gray */ |
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/* levels used in the bitmap. */ |
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/* */ |
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/* pixel_mode :: The pixel mode, i.e., how pixel bits are stored. */ |
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/* See @QT_FT_Pixel_Mode for possible values. */ |
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/* */ |
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/* palette_mode :: This field is only used with paletted pixel modes; */ |
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/* it indicates how the palette is stored. */ |
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/* */ |
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/* palette :: A typeless pointer to the bitmap palette; only */ |
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/* used for paletted pixel modes. */ |
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/* */ |
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/* <Note> */ |
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/* For now, the only pixel mode supported by FreeType are mono and */ |
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/* grays. However, drivers might be added in the future to support */ |
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/* more `colorful' options. */ |
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/* */ |
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/* When using pixel modes pal2, pal4 and pal8 with a void `palette' */ |
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/* field, a gray pixmap with respectively 4, 16, and 256 levels of */ |
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/* gray is assumed. This, in order to be compatible with some */ |
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/* embedded bitmap formats defined in the TrueType specification. */ |
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/* */ |
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/* Note that no font was found presenting such embedded bitmaps, so */ |
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/* this is currently completely unhandled by the library. */ |
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/* */ |
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typedef struct QT_FT_Bitmap_ |
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{
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int rows; |
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int width; |
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int pitch; |
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unsigned char* buffer; |
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short num_grays; |
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char pixel_mode; |
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char palette_mode; |
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void* palette; |
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} QT_FT_Bitmap; |
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/*************************************************************************/ |
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/* */ |
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/* <Section> */ |
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/* outline_processing */ |
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/* */ |
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/*************************************************************************/ |
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||
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/*************************************************************************/ |
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/* */ |
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/* <Struct> */ |
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/* QT_FT_Outline */ |
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/* */ |
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/* <Description> */ |
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/* This structure is used to describe an outline to the scan-line */ |
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/* converter. */ |
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/* */ |
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/* <Fields> */ |
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/* n_contours :: The number of contours in the outline. */ |
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/* */ |
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/* n_points :: The number of points in the outline. */ |
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/* */ |
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/* points :: A pointer to an array of `n_points' QT_FT_Vector */ |
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/* elements, giving the outline's point coordinates. */ |
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/* */ |
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/* tags :: A pointer to an array of `n_points' chars, giving */ |
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/* each outline point's type. If bit 0 is unset, the */ |
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/* point is `off' the curve, i.e. a Bezier control */ |
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/* point, while it is `on' when set. */ |
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/* */ |
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/* Bit 1 is meaningful for `off' points only. If set, */ |
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/* it indicates a third-order Bezier arc control point; */ |
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/* and a second-order control point if unset. */ |
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/* */ |
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/* contours :: An array of `n_contours' shorts, giving the end */ |
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/* point of each contour within the outline. For */ |
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/* example, the first contour is defined by the points */ |
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/* `0' to `contours[0]', the second one is defined by */ |
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/* the points `contours[0]+1' to `contours[1]', etc. */ |
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/* */ |
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/* flags :: A set of bit flags used to characterize the outline */ |
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/* and give hints to the scan-converter and hinter on */ |
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/* how to convert/grid-fit it. See QT_FT_Outline_Flags. */ |
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388 |
/* */ |
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typedef struct QT_FT_Outline_ |
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{
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int n_contours; /* number of contours in glyph */ |
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int n_points; /* number of points in the glyph */ |
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||
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QT_FT_Vector* points; /* the outline's points */ |
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char* tags; /* the points flags */ |
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int* contours; /* the contour end points */ |
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int flags; /* outline masks */ |
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} QT_FT_Outline; |
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401 |
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||
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/*************************************************************************/ |
|
404 |
/* */ |
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405 |
/* <Enum> */ |
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406 |
/* QT_FT_OUTLINE_FLAGS */ |
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407 |
/* */ |
|
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/* <Description> */ |
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409 |
/* A list of bit-field constants use for the flags in an outline's */ |
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/* `flags' field. */ |
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411 |
/* */ |
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/* <Values> */ |
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413 |
/* QT_FT_OUTLINE_NONE :: Value 0 is reserved. */ |
|
414 |
/* */ |
|
415 |
/* QT_FT_OUTLINE_OWNER :: If set, this flag indicates that the */ |
|
416 |
/* outline's field arrays (i.e. */ |
|
417 |
/* `points', `flags' & `contours') are */ |
|
418 |
/* `owned' by the outline object, and */ |
|
419 |
/* should thus be freed when it is */ |
|
420 |
/* destroyed. */ |
|
421 |
/* */ |
|
422 |
/* QT_FT_OUTLINE_EVEN_ODD_FILL :: By default, outlines are filled using */ |
|
423 |
/* the non-zero winding rule. If set to */ |
|
424 |
/* 1, the outline will be filled using */ |
|
425 |
/* the even-odd fill rule (only works */ |
|
426 |
/* with the smooth raster). */ |
|
427 |
/* */ |
|
428 |
/* QT_FT_OUTLINE_REVERSE_FILL :: By default, outside contours of an */ |
|
429 |
/* outline are oriented in clock-wise */ |
|
430 |
/* direction, as defined in the TrueType */ |
|
431 |
/* specification. This flag is set if */ |
|
432 |
/* the outline uses the opposite */ |
|
433 |
/* direction (typically for Type 1 */ |
|
434 |
/* fonts). This flag is ignored by the */ |
|
435 |
/* scan-converter. However, it is very */ |
|
436 |
/* important for the auto-hinter. */ |
|
437 |
/* */ |
|
438 |
/* QT_FT_OUTLINE_IGNORE_DROPOUTS :: By default, the scan converter will */ |
|
439 |
/* try to detect drop-outs in an outline */ |
|
440 |
/* and correct the glyph bitmap to */ |
|
441 |
/* ensure consistent shape continuity. */ |
|
442 |
/* If set, this flag hints the scan-line */ |
|
443 |
/* converter to ignore such cases. */ |
|
444 |
/* */ |
|
445 |
/* QT_FT_OUTLINE_HIGH_PRECISION :: This flag indicates that the */ |
|
446 |
/* scan-line converter should try to */ |
|
447 |
/* convert this outline to bitmaps with */ |
|
448 |
/* the highest possible quality. It is */ |
|
449 |
/* typically set for small character */ |
|
450 |
/* sizes. Note that this is only a */ |
|
451 |
/* hint, that might be completely */ |
|
452 |
/* ignored by a given scan-converter. */ |
|
453 |
/* */ |
|
454 |
/* QT_FT_OUTLINE_SINGLE_PASS :: This flag is set to force a given */ |
|
455 |
/* scan-converter to only use a single */ |
|
456 |
/* pass over the outline to render a */ |
|
457 |
/* bitmap glyph image. Normally, it is */ |
|
458 |
/* set for very large character sizes. */ |
|
459 |
/* It is only a hint, that might be */ |
|
460 |
/* completely ignored by a given */ |
|
461 |
/* scan-converter. */ |
|
462 |
/* */ |
|
463 |
#define QT_FT_OUTLINE_NONE 0x0 |
|
464 |
#define QT_FT_OUTLINE_OWNER 0x1 |
|
465 |
#define QT_FT_OUTLINE_EVEN_ODD_FILL 0x2 |
|
466 |
#define QT_FT_OUTLINE_REVERSE_FILL 0x4 |
|
467 |
#define QT_FT_OUTLINE_IGNORE_DROPOUTS 0x8 |
|
468 |
||
469 |
#define QT_FT_OUTLINE_HIGH_PRECISION 0x100 |
|
470 |
#define QT_FT_OUTLINE_SINGLE_PASS 0x200 |
|
471 |
||
472 |
||
473 |
/************************************************************************* |
|
474 |
* |
|
475 |
* @enum: |
|
476 |
* qt_ft_outline_flags |
|
477 |
* |
|
478 |
* @description: |
|
479 |
* These constants are deprecated. Please use the corresponding |
|
480 |
* @QT_FT_OUTLINE_FLAGS values. |
|
481 |
* |
|
482 |
* @values: |
|
483 |
* qt_ft_outline_none :: See @QT_FT_OUTLINE_NONE. |
|
484 |
* qt_ft_outline_owner :: See @QT_FT_OUTLINE_OWNER. |
|
485 |
* qt_ft_outline_even_odd_fill :: See @QT_FT_OUTLINE_EVEN_ODD_FILL. |
|
486 |
* qt_ft_outline_reverse_fill :: See @QT_FT_OUTLINE_REVERSE_FILL. |
|
487 |
* qt_ft_outline_ignore_dropouts :: See @QT_FT_OUTLINE_IGNORE_DROPOUTS. |
|
488 |
* qt_ft_outline_high_precision :: See @QT_FT_OUTLINE_HIGH_PRECISION. |
|
489 |
* qt_ft_outline_single_pass :: See @QT_FT_OUTLINE_SINGLE_PASS. |
|
490 |
*/ |
|
491 |
#define qt_ft_outline_none QT_FT_OUTLINE_NONE |
|
492 |
#define qt_ft_outline_owner QT_FT_OUTLINE_OWNER |
|
493 |
#define qt_ft_outline_even_odd_fill QT_FT_OUTLINE_EVEN_ODD_FILL |
|
494 |
#define qt_ft_outline_reverse_fill QT_FT_OUTLINE_REVERSE_FILL |
|
495 |
#define qt_ft_outline_ignore_dropouts QT_FT_OUTLINE_IGNORE_DROPOUTS |
|
496 |
#define qt_ft_outline_high_precision QT_FT_OUTLINE_HIGH_PRECISION |
|
497 |
#define qt_ft_outline_single_pass QT_FT_OUTLINE_SINGLE_PASS |
|
498 |
||
499 |
/* */ |
|
500 |
||
501 |
#define QT_FT_CURVE_TAG( flag ) ( flag & 3 ) |
|
502 |
||
503 |
#define QT_FT_CURVE_TAG_ON 1 |
|
504 |
#define QT_FT_CURVE_TAG_CONIC 0 |
|
505 |
#define QT_FT_CURVE_TAG_CUBIC 2 |
|
506 |
||
507 |
#define QT_FT_CURVE_TAG_TOUCH_X 8 /* reserved for the TrueType hinter */ |
|
508 |
#define QT_FT_CURVE_TAG_TOUCH_Y 16 /* reserved for the TrueType hinter */ |
|
509 |
||
510 |
#define QT_FT_CURVE_TAG_TOUCH_BOTH ( QT_FT_CURVE_TAG_TOUCH_X | \ |
|
511 |
QT_FT_CURVE_TAG_TOUCH_Y ) |
|
512 |
||
513 |
#define QT_FT_Curve_Tag_On QT_FT_CURVE_TAG_ON |
|
514 |
#define QT_FT_Curve_Tag_Conic QT_FT_CURVE_TAG_CONIC |
|
515 |
#define QT_FT_Curve_Tag_Cubic QT_FT_CURVE_TAG_CUBIC |
|
516 |
#define QT_FT_Curve_Tag_Touch_X QT_FT_CURVE_TAG_TOUCH_X |
|
517 |
#define QT_FT_Curve_Tag_Touch_Y QT_FT_CURVE_TAG_TOUCH_Y |
|
518 |
||
519 |
/*************************************************************************/ |
|
520 |
/* */ |
|
521 |
/* <FuncType> */ |
|
522 |
/* QT_FT_Outline_MoveToFunc */ |
|
523 |
/* */ |
|
524 |
/* <Description> */ |
|
525 |
/* A function pointer type used to describe the signature of a `move */ |
|
526 |
/* to' function during outline walking/decomposition. */ |
|
527 |
/* */ |
|
528 |
/* A `move to' is emitted to start a new contour in an outline. */ |
|
529 |
/* */ |
|
530 |
/* <Input> */ |
|
531 |
/* to :: A pointer to the target point of the `move to'. */ |
|
532 |
/* */ |
|
533 |
/* user :: A typeless pointer which is passed from the caller of the */ |
|
534 |
/* decomposition function. */ |
|
535 |
/* */ |
|
536 |
/* <Return> */ |
|
537 |
/* Error code. 0 means success. */ |
|
538 |
/* */ |
|
539 |
typedef int |
|
540 |
(*QT_FT_Outline_MoveToFunc)( QT_FT_Vector* to, |
|
541 |
void* user ); |
|
542 |
||
543 |
#define QT_FT_Outline_MoveTo_Func QT_FT_Outline_MoveToFunc |
|
544 |
||
545 |
/*************************************************************************/ |
|
546 |
/* */ |
|
547 |
/* <FuncType> */ |
|
548 |
/* QT_FT_Outline_LineToFunc */ |
|
549 |
/* */ |
|
550 |
/* <Description> */ |
|
551 |
/* A function pointer type used to describe the signature of a `line */ |
|
552 |
/* to' function during outline walking/decomposition. */ |
|
553 |
/* */ |
|
554 |
/* A `line to' is emitted to indicate a segment in the outline. */ |
|
555 |
/* */ |
|
556 |
/* <Input> */ |
|
557 |
/* to :: A pointer to the target point of the `line to'. */ |
|
558 |
/* */ |
|
559 |
/* user :: A typeless pointer which is passed from the caller of the */ |
|
560 |
/* decomposition function. */ |
|
561 |
/* */ |
|
562 |
/* <Return> */ |
|
563 |
/* Error code. 0 means success. */ |
|
564 |
/* */ |
|
565 |
typedef int |
|
566 |
(*QT_FT_Outline_LineToFunc)( QT_FT_Vector* to, |
|
567 |
void* user ); |
|
568 |
||
569 |
#define QT_FT_Outline_LineTo_Func QT_FT_Outline_LineToFunc |
|
570 |
||
571 |
/*************************************************************************/ |
|
572 |
/* */ |
|
573 |
/* <FuncType> */ |
|
574 |
/* QT_FT_Outline_ConicToFunc */ |
|
575 |
/* */ |
|
576 |
/* <Description> */ |
|
577 |
/* A function pointer type use to describe the signature of a `conic */ |
|
578 |
/* to' function during outline walking/decomposition. */ |
|
579 |
/* */ |
|
580 |
/* A `conic to' is emitted to indicate a second-order Bezier arc in */ |
|
581 |
/* the outline. */ |
|
582 |
/* */ |
|
583 |
/* <Input> */ |
|
584 |
/* control :: An intermediate control point between the last position */ |
|
585 |
/* and the new target in `to'. */ |
|
586 |
/* */ |
|
587 |
/* to :: A pointer to the target end point of the conic arc. */ |
|
588 |
/* */ |
|
589 |
/* user :: A typeless pointer which is passed from the caller of */ |
|
590 |
/* the decomposition function. */ |
|
591 |
/* */ |
|
592 |
/* <Return> */ |
|
593 |
/* Error code. 0 means success. */ |
|
594 |
/* */ |
|
595 |
typedef int |
|
596 |
(*QT_FT_Outline_ConicToFunc)( QT_FT_Vector* control, |
|
597 |
QT_FT_Vector* to, |
|
598 |
void* user ); |
|
599 |
||
600 |
#define QT_FT_Outline_ConicTo_Func QT_FT_Outline_ConicToFunc |
|
601 |
||
602 |
/*************************************************************************/ |
|
603 |
/* */ |
|
604 |
/* <FuncType> */ |
|
605 |
/* QT_FT_Outline_CubicToFunc */ |
|
606 |
/* */ |
|
607 |
/* <Description> */ |
|
608 |
/* A function pointer type used to describe the signature of a `cubic */ |
|
609 |
/* to' function during outline walking/decomposition. */ |
|
610 |
/* */ |
|
611 |
/* A `cubic to' is emitted to indicate a third-order Bezier arc. */ |
|
612 |
/* */ |
|
613 |
/* <Input> */ |
|
614 |
/* control1 :: A pointer to the first Bezier control point. */ |
|
615 |
/* */ |
|
616 |
/* control2 :: A pointer to the second Bezier control point. */ |
|
617 |
/* */ |
|
618 |
/* to :: A pointer to the target end point. */ |
|
619 |
/* */ |
|
620 |
/* user :: A typeless pointer which is passed from the caller of */ |
|
621 |
/* the decomposition function. */ |
|
622 |
/* */ |
|
623 |
/* <Return> */ |
|
624 |
/* Error code. 0 means success. */ |
|
625 |
/* */ |
|
626 |
typedef int |
|
627 |
(*QT_FT_Outline_CubicToFunc)( QT_FT_Vector* control1, |
|
628 |
QT_FT_Vector* control2, |
|
629 |
QT_FT_Vector* to, |
|
630 |
void* user ); |
|
631 |
||
632 |
#define QT_FT_Outline_CubicTo_Func QT_FT_Outline_CubicToFunc |
|
633 |
||
634 |
||
635 |
/*************************************************************************/ |
|
636 |
/* */ |
|
637 |
/* <Struct> */ |
|
638 |
/* QT_FT_Outline_Funcs */ |
|
639 |
/* */ |
|
640 |
/* <Description> */ |
|
641 |
/* A structure to hold various function pointers used during outline */ |
|
642 |
/* decomposition in order to emit segments, conic, and cubic Beziers, */ |
|
643 |
/* as well as `move to' and `close to' operations. */ |
|
644 |
/* */ |
|
645 |
/* <Fields> */ |
|
646 |
/* move_to :: The `move to' emitter. */ |
|
647 |
/* */ |
|
648 |
/* line_to :: The segment emitter. */ |
|
649 |
/* */ |
|
650 |
/* conic_to :: The second-order Bezier arc emitter. */ |
|
651 |
/* */ |
|
652 |
/* cubic_to :: The third-order Bezier arc emitter. */ |
|
653 |
/* */ |
|
654 |
/* shift :: The shift that is applied to coordinates before they */ |
|
655 |
/* are sent to the emitter. */ |
|
656 |
/* */ |
|
657 |
/* delta :: The delta that is applied to coordinates before they */ |
|
658 |
/* are sent to the emitter, but after the shift. */ |
|
659 |
/* */ |
|
660 |
/* <Note> */ |
|
661 |
/* The point coordinates sent to the emitters are the transformed */ |
|
662 |
/* version of the original coordinates (this is important for high */ |
|
663 |
/* accuracy during scan-conversion). The transformation is simple: */ |
|
664 |
/* */ |
|
665 |
/* x' = (x << shift) - delta */ |
|
666 |
/* y' = (x << shift) - delta */ |
|
667 |
/* */ |
|
668 |
/* Set the value of `shift' and `delta' to 0 to get the original */ |
|
669 |
/* point coordinates. */ |
|
670 |
/* */ |
|
671 |
typedef struct QT_FT_Outline_Funcs_ |
|
672 |
{
|
|
673 |
QT_FT_Outline_MoveToFunc move_to; |
|
674 |
QT_FT_Outline_LineToFunc line_to; |
|
675 |
QT_FT_Outline_ConicToFunc conic_to; |
|
676 |
QT_FT_Outline_CubicToFunc cubic_to; |
|
677 |
||
678 |
int shift; |
|
679 |
QT_FT_Pos delta; |
|
680 |
||
681 |
} QT_FT_Outline_Funcs; |
|
682 |
||
683 |
||
684 |
/*************************************************************************/ |
|
685 |
/* */ |
|
686 |
/* <Section> */ |
|
687 |
/* basic_types */ |
|
688 |
/* */ |
|
689 |
/*************************************************************************/ |
|
690 |
||
691 |
||
692 |
/*************************************************************************/ |
|
693 |
/* */ |
|
694 |
/* <Macro> */ |
|
695 |
/* QT_FT_IMAGE_TAG */ |
|
696 |
/* */ |
|
697 |
/* <Description> */ |
|
698 |
/* This macro converts four letter tags into an unsigned long. */ |
|
699 |
/* */ |
|
700 |
/* <Note> */ |
|
701 |
/* Since many 16bit compilers don't like 32bit enumerations, you */ |
|
702 |
/* should redefine this macro in case of problems to something like */ |
|
703 |
/* this: */ |
|
704 |
/* */ |
|
705 |
/* #define QT_FT_IMAGE_TAG( value, _x1, _x2, _x3, _x4 ) value */ |
|
706 |
/* */ |
|
707 |
/* to get a simple enumeration without assigning special numbers. */ |
|
708 |
/* */ |
|
709 |
#ifndef QT_FT_IMAGE_TAG |
|
710 |
#define QT_FT_IMAGE_TAG( value, _x1, _x2, _x3, _x4 ) \ |
|
711 |
value = ( ( (unsigned long)_x1 << 24 ) | \ |
|
712 |
( (unsigned long)_x2 << 16 ) | \ |
|
713 |
( (unsigned long)_x3 << 8 ) | \ |
|
714 |
(unsigned long)_x4 ) |
|
715 |
#endif /* QT_FT_IMAGE_TAG */ |
|
716 |
||
717 |
||
718 |
/*************************************************************************/ |
|
719 |
/* */ |
|
720 |
/* <Enum> */ |
|
721 |
/* QT_FT_Glyph_Format */ |
|
722 |
/* */ |
|
723 |
/* <Description> */ |
|
724 |
/* An enumeration type used to describe the format of a given glyph */ |
|
725 |
/* image. Note that this version of FreeType only supports two image */ |
|
726 |
/* formats, even though future font drivers will be able to register */ |
|
727 |
/* their own format. */ |
|
728 |
/* */ |
|
729 |
/* <Values> */ |
|
730 |
/* QT_FT_GLYPH_FORMAT_NONE :: */ |
|
731 |
/* The value 0 is reserved and does describe a glyph format. */ |
|
732 |
/* */ |
|
733 |
/* QT_FT_GLYPH_FORMAT_COMPOSITE :: */ |
|
734 |
/* The glyph image is a composite of several other images. This */ |
|
735 |
/* format is _only_ used with @QT_FT_LOAD_NO_RECURSE, and is used to */ |
|
736 |
/* report compound glyphs (like accented characters). */ |
|
737 |
/* */ |
|
738 |
/* QT_FT_GLYPH_FORMAT_BITMAP :: */ |
|
739 |
/* The glyph image is a bitmap, and can be described as an */ |
|
740 |
/* @QT_FT_Bitmap. You generally need to access the `bitmap' field of */ |
|
741 |
/* the @QT_FT_GlyphSlotRec structure to read it. */ |
|
742 |
/* */ |
|
743 |
/* QT_FT_GLYPH_FORMAT_OUTLINE :: */ |
|
744 |
/* The glyph image is a vertorial outline made of line segments */ |
|
745 |
/* and Bezier arcs; it can be described as an @QT_FT_Outline; you */ |
|
746 |
/* generally want to access the `outline' field of the */ |
|
747 |
/* @QT_FT_GlyphSlotRec structure to read it. */ |
|
748 |
/* */ |
|
749 |
/* QT_FT_GLYPH_FORMAT_PLOTTER :: */ |
|
750 |
/* The glyph image is a vectorial path with no inside/outside */ |
|
751 |
/* contours. Some Type 1 fonts, like those in the Hershey family, */ |
|
752 |
/* contain glyphs in this format. These are described as */ |
|
753 |
/* @QT_FT_Outline, but FreeType isn't currently capable of rendering */ |
|
754 |
/* them correctly. */ |
|
755 |
/* */ |
|
756 |
typedef enum QT_FT_Glyph_Format_ |
|
757 |
{
|
|
758 |
QT_FT_IMAGE_TAG( QT_FT_GLYPH_FORMAT_NONE, 0, 0, 0, 0 ), |
|
759 |
||
760 |
QT_FT_IMAGE_TAG( QT_FT_GLYPH_FORMAT_COMPOSITE, 'c', 'o', 'm', 'p' ), |
|
761 |
QT_FT_IMAGE_TAG( QT_FT_GLYPH_FORMAT_BITMAP, 'b', 'i', 't', 's' ), |
|
762 |
QT_FT_IMAGE_TAG( QT_FT_GLYPH_FORMAT_OUTLINE, 'o', 'u', 't', 'l' ), |
|
763 |
QT_FT_IMAGE_TAG( QT_FT_GLYPH_FORMAT_PLOTTER, 'p', 'l', 'o', 't' ) |
|
764 |
||
765 |
} QT_FT_Glyph_Format; |
|
766 |
||
767 |
||
768 |
/*************************************************************************/ |
|
769 |
/* */ |
|
770 |
/* <Enum> */ |
|
771 |
/* qt_ft_glyph_format_xxx */ |
|
772 |
/* */ |
|
773 |
/* <Description> */ |
|
774 |
/* A list of decprecated constants. Use the corresponding */ |
|
775 |
/* @QT_FT_Glyph_Format values instead. */ |
|
776 |
/* */ |
|
777 |
/* <Values> */ |
|
778 |
/* qt_ft_glyph_format_none :: see @QT_FT_GLYPH_FORMAT_NONE */ |
|
779 |
/* qt_ft_glyph_format_composite :: see @QT_FT_GLYPH_FORMAT_COMPOSITE */ |
|
780 |
/* qt_ft_glyph_format_bitmap :: see @QT_FT_GLYPH_FORMAT_BITMAP */ |
|
781 |
/* qt_ft_glyph_format_outline :: see @QT_FT_GLYPH_FORMAT_OUTLINE */ |
|
782 |
/* qt_ft_glyph_format_plotter :: see @QT_FT_GLYPH_FORMAT_PLOTTER */ |
|
783 |
/* */ |
|
784 |
#define qt_ft_glyph_format_none QT_FT_GLYPH_FORMAT_NONE |
|
785 |
#define qt_ft_glyph_format_composite QT_FT_GLYPH_FORMAT_COMPOSITE |
|
786 |
#define qt_ft_glyph_format_bitmap QT_FT_GLYPH_FORMAT_BITMAP |
|
787 |
#define qt_ft_glyph_format_outline QT_FT_GLYPH_FORMAT_OUTLINE |
|
788 |
#define qt_ft_glyph_format_plotter QT_FT_GLYPH_FORMAT_PLOTTER |
|
789 |
||
790 |
||
791 |
/*************************************************************************/ |
|
792 |
/*************************************************************************/ |
|
793 |
/*************************************************************************/ |
|
794 |
/***** *****/ |
|
795 |
/***** R A S T E R D E F I N I T I O N S *****/ |
|
796 |
/***** *****/ |
|
797 |
/*************************************************************************/ |
|
798 |
/*************************************************************************/ |
|
799 |
/*************************************************************************/ |
|
800 |
||
801 |
||
802 |
/*************************************************************************/ |
|
803 |
/* */ |
|
804 |
/* A raster is a scan converter, in charge of rendering an outline into */ |
|
805 |
/* a a bitmap. This section contains the public API for rasters. */ |
|
806 |
/* */ |
|
807 |
/* Note that in FreeType 2, all rasters are now encapsulated within */ |
|
808 |
/* specific modules called `renderers'. See `freetype/ftrender.h' for */ |
|
809 |
/* more details on renderers. */ |
|
810 |
/* */ |
|
811 |
/*************************************************************************/ |
|
812 |
||
813 |
||
814 |
/*************************************************************************/ |
|
815 |
/* */ |
|
816 |
/* <Section> */ |
|
817 |
/* raster */ |
|
818 |
/* */ |
|
819 |
/* <Title> */ |
|
820 |
/* Scanline converter */ |
|
821 |
/* */ |
|
822 |
/* <Abstract> */ |
|
823 |
/* How vectorial outlines are converted into bitmaps and pixmaps. */ |
|
824 |
/* */ |
|
825 |
/* <Description> */ |
|
826 |
/* This section contains technical definitions. */ |
|
827 |
/* */ |
|
828 |
/*************************************************************************/ |
|
829 |
||
830 |
||
831 |
/*************************************************************************/ |
|
832 |
/* */ |
|
833 |
/* <Type> */ |
|
834 |
/* QT_FT_Raster */ |
|
835 |
/* */ |
|
836 |
/* <Description> */ |
|
837 |
/* A handle (pointer) to a raster object. Each object can be used */ |
|
838 |
/* independently to convert an outline into a bitmap or pixmap. */ |
|
839 |
/* */ |
|
840 |
typedef struct QT_FT_RasterRec_* QT_FT_Raster; |
|
841 |
||
842 |
||
843 |
/*************************************************************************/ |
|
844 |
/* */ |
|
845 |
/* <Struct> */ |
|
846 |
/* QT_FT_Span */ |
|
847 |
/* */ |
|
848 |
/* <Description> */ |
|
849 |
/* A structure used to model a single span of gray (or black) pixels */ |
|
850 |
/* when rendering a monochrome or anti-aliased bitmap. */ |
|
851 |
/* */ |
|
852 |
/* <Fields> */ |
|
853 |
/* x :: The span's horizontal start position. */ |
|
854 |
/* */ |
|
855 |
/* len :: The span's length in pixels. */ |
|
856 |
/* */ |
|
857 |
/* coverage :: The span color/coverage, ranging from 0 (background) */ |
|
858 |
/* to 255 (foreground). Only used for anti-aliased */ |
|
859 |
/* rendering. */ |
|
860 |
/* */ |
|
861 |
/* <Note> */ |
|
862 |
/* This structure is used by the span drawing callback type named */ |
|
863 |
/* QT_FT_SpanFunc which takes the y-coordinate of the span as a */ |
|
864 |
/* a parameter. */ |
|
865 |
/* */ |
|
866 |
/* The coverage value is always between 0 and 255, even if the number */ |
|
867 |
/* of gray levels have been set through QT_FT_Set_Gray_Levels(). */ |
|
868 |
/* */ |
|
869 |
typedef struct QT_FT_Span_ |
|
870 |
{
|
|
871 |
short x; |
|
872 |
unsigned short len; |
|
873 |
short y; |
|
874 |
unsigned char coverage; |
|
875 |
} QT_FT_Span; |
|
876 |
||
877 |
||
878 |
/*************************************************************************/ |
|
879 |
/* */ |
|
880 |
/* <FuncType> */ |
|
881 |
/* QT_FT_SpanFunc */ |
|
882 |
/* */ |
|
883 |
/* <Description> */ |
|
884 |
/* A function used as a call-back by the anti-aliased renderer in */ |
|
885 |
/* order to let client applications draw themselves the gray pixel */ |
|
886 |
/* spans on each scan line. */ |
|
887 |
/* */ |
|
888 |
/* <Input> */ |
|
889 |
/* y :: The scanline's y-coordinate. */ |
|
890 |
/* */ |
|
891 |
/* count :: The number of spans to draw on this scanline. */ |
|
892 |
/* */ |
|
893 |
/* spans :: A table of `count' spans to draw on the scanline. */ |
|
894 |
/* */ |
|
895 |
/* user :: User-supplied data that is passed to the callback. */ |
|
896 |
/* */ |
|
897 |
/* <Note> */ |
|
898 |
/* This callback allows client applications to directly render the */ |
|
899 |
/* gray spans of the anti-aliased bitmap to any kind of surfaces. */ |
|
900 |
/* */ |
|
901 |
/* This can be used to write anti-aliased outlines directly to a */ |
|
902 |
/* given background bitmap, and even perform translucency. */ |
|
903 |
/* */ |
|
904 |
/* Note that the `count' field cannot be greater than a fixed value */ |
|
905 |
/* defined by the QT_FT_MAX_GRAY_SPANS configuration macro in */ |
|
906 |
/* ftoption.h. By default, this value is set to 32, which means that */ |
|
907 |
/* if there are more than 32 spans on a given scanline, the callback */ |
|
908 |
/* will be called several times with the same `y' parameter in order */ |
|
909 |
/* to draw all callbacks. */ |
|
910 |
/* */ |
|
911 |
/* Otherwise, the callback is only called once per scan-line, and */ |
|
912 |
/* only for those scanlines that do have `gray' pixels on them. */ |
|
913 |
/* */ |
|
914 |
typedef void |
|
915 |
(*QT_FT_SpanFunc)(int count, |
|
916 |
const QT_FT_Span* spans, |
|
917 |
void* worker); |
|
918 |
||
919 |
#define QT_FT_Raster_Span_Func QT_FT_SpanFunc |
|
920 |
||
921 |
||
922 |
/*************************************************************************/ |
|
923 |
/* */ |
|
924 |
/* <FuncType> */ |
|
925 |
/* QT_FT_Raster_BitTest_Func */ |
|
926 |
/* */ |
|
927 |
/* <Description> */ |
|
928 |
/* THIS TYPE IS DEPRECATED. DO NOT USE IT. */ |
|
929 |
/* */ |
|
930 |
/* A function used as a call-back by the monochrome scan-converter */ |
|
931 |
/* to test whether a given target pixel is already set to the drawing */ |
|
932 |
/* `color'. These tests are crucial to implement drop-out control */ |
|
933 |
/* per-se the TrueType spec. */ |
|
934 |
/* */ |
|
935 |
/* <Input> */ |
|
936 |
/* y :: The pixel's y-coordinate. */ |
|
937 |
/* */ |
|
938 |
/* x :: The pixel's x-coordinate. */ |
|
939 |
/* */ |
|
940 |
/* user :: User-supplied data that is passed to the callback. */ |
|
941 |
/* */ |
|
942 |
/* <Return> */ |
|
943 |
/* 1 if the pixel is `set', 0 otherwise. */ |
|
944 |
/* */ |
|
945 |
typedef int |
|
946 |
(*QT_FT_Raster_BitTest_Func)( int y, |
|
947 |
int x, |
|
948 |
void* user ); |
|
949 |
||
950 |
||
951 |
/*************************************************************************/ |
|
952 |
/* */ |
|
953 |
/* <FuncType> */ |
|
954 |
/* QT_FT_Raster_BitSet_Func */ |
|
955 |
/* */ |
|
956 |
/* <Description> */ |
|
957 |
/* THIS TYPE IS DEPRECATED. DO NOT USE IT. */ |
|
958 |
/* */ |
|
959 |
/* A function used as a call-back by the monochrome scan-converter */ |
|
960 |
/* to set an individual target pixel. This is crucial to implement */ |
|
961 |
/* drop-out control according to the TrueType specification. */ |
|
962 |
/* */ |
|
963 |
/* <Input> */ |
|
964 |
/* y :: The pixel's y-coordinate. */ |
|
965 |
/* */ |
|
966 |
/* x :: The pixel's x-coordinate. */ |
|
967 |
/* */ |
|
968 |
/* user :: User-supplied data that is passed to the callback. */ |
|
969 |
/* */ |
|
970 |
/* <Return> */ |
|
971 |
/* 1 if the pixel is `set', 0 otherwise. */ |
|
972 |
/* */ |
|
973 |
typedef void |
|
974 |
(*QT_FT_Raster_BitSet_Func)( int y, |
|
975 |
int x, |
|
976 |
void* user ); |
|
977 |
||
978 |
||
979 |
/*************************************************************************/ |
|
980 |
/* */ |
|
981 |
/* <Enum> */ |
|
982 |
/* QT_FT_RASTER_FLAG_XXX */ |
|
983 |
/* */ |
|
984 |
/* <Description> */ |
|
985 |
/* A list of bit flag constants as used in the `flags' field of a */ |
|
986 |
/* @QT_FT_Raster_Params structure. */ |
|
987 |
/* */ |
|
988 |
/* <Values> */ |
|
989 |
/* QT_FT_RASTER_FLAG_DEFAULT :: This value is 0. */ |
|
990 |
/* */ |
|
991 |
/* QT_FT_RASTER_FLAG_AA :: This flag is set to indicate that an */ |
|
992 |
/* anti-aliased glyph image should be */ |
|
993 |
/* generated. Otherwise, it will be */ |
|
994 |
/* monochrome (1-bit). */ |
|
995 |
/* */ |
|
996 |
/* QT_FT_RASTER_FLAG_DIRECT :: This flag is set to indicate direct */ |
|
997 |
/* rendering. In this mode, client */ |
|
998 |
/* applications must provide their own span */ |
|
999 |
/* callback. This lets them directly */ |
|
1000 |
/* draw or compose over an existing bitmap. */ |
|
1001 |
/* If this bit is not set, the target */ |
|
1002 |
/* pixmap's buffer _must_ be zeroed before */ |
|
1003 |
/* rendering. */ |
|
1004 |
/* */ |
|
1005 |
/* Note that for now, direct rendering is */ |
|
1006 |
/* only possible with anti-aliased glyphs. */ |
|
1007 |
/* */ |
|
1008 |
/* QT_FT_RASTER_FLAG_CLIP :: This flag is only used in direct */ |
|
1009 |
/* rendering mode. If set, the output will */ |
|
1010 |
/* be clipped to a box specified in the */ |
|
1011 |
/* "clip_box" field of the QT_FT_Raster_Params */ |
|
1012 |
/* structure. */ |
|
1013 |
/* */ |
|
1014 |
/* Note that by default, the glyph bitmap */ |
|
1015 |
/* is clipped to the target pixmap, except */ |
|
1016 |
/* in direct rendering mode where all spans */ |
|
1017 |
/* are generated if no clipping box is set. */ |
|
1018 |
/* */ |
|
1019 |
#define QT_FT_RASTER_FLAG_DEFAULT 0x0 |
|
1020 |
#define QT_FT_RASTER_FLAG_AA 0x1 |
|
1021 |
#define QT_FT_RASTER_FLAG_DIRECT 0x2 |
|
1022 |
#define QT_FT_RASTER_FLAG_CLIP 0x4 |
|
1023 |
||
1024 |
/* deprecated */ |
|
1025 |
#define qt_ft_raster_flag_default QT_FT_RASTER_FLAG_DEFAULT |
|
1026 |
#define qt_ft_raster_flag_aa QT_FT_RASTER_FLAG_AA |
|
1027 |
#define qt_ft_raster_flag_direct QT_FT_RASTER_FLAG_DIRECT |
|
1028 |
#define qt_ft_raster_flag_clip QT_FT_RASTER_FLAG_CLIP |
|
1029 |
||
1030 |
||
1031 |
/*************************************************************************/ |
|
1032 |
/* */ |
|
1033 |
/* <Struct> */ |
|
1034 |
/* QT_FT_Raster_Params */ |
|
1035 |
/* */ |
|
1036 |
/* <Description> */ |
|
1037 |
/* A structure to hold the arguments used by a raster's render */ |
|
1038 |
/* function. */ |
|
1039 |
/* */ |
|
1040 |
/* <Fields> */ |
|
1041 |
/* target :: The target bitmap. */ |
|
1042 |
/* */ |
|
1043 |
/* source :: A pointer to the source glyph image (e.g. an */ |
|
1044 |
/* QT_FT_Outline). */ |
|
1045 |
/* */ |
|
1046 |
/* flags :: The rendering flags. */ |
|
1047 |
/* */ |
|
1048 |
/* gray_spans :: The gray span drawing callback. */ |
|
1049 |
/* */ |
|
1050 |
/* black_spans :: The black span drawing callback. */ |
|
1051 |
/* */ |
|
1052 |
/* bit_test :: The bit test callback. UNIMPLEMENTED! */ |
|
1053 |
/* */ |
|
1054 |
/* bit_set :: The bit set callback. UNIMPLEMENTED! */ |
|
1055 |
/* */ |
|
1056 |
/* user :: User-supplied data that is passed to each drawing */ |
|
1057 |
/* callback. */ |
|
1058 |
/* */ |
|
1059 |
/* clip_box :: An optional clipping box. It is only used in */ |
|
1060 |
/* direct rendering mode. Note that coordinates here */ |
|
1061 |
/* should be expressed in _integer_ pixels (and not in */ |
|
1062 |
/* 26.6 fixed-point units). */ |
|
1063 |
/* */ |
|
1064 |
/* <Note> */ |
|
1065 |
/* An anti-aliased glyph bitmap is drawn if the QT_FT_RASTER_FLAG_AA bit */ |
|
1066 |
/* flag is set in the `flags' field, otherwise a monochrome bitmap */ |
|
1067 |
/* will be generated. */ |
|
1068 |
/* */ |
|
1069 |
/* If the QT_FT_RASTER_FLAG_DIRECT bit flag is set in `flags', the */ |
|
1070 |
/* raster will call the `gray_spans' callback to draw gray pixel */ |
|
1071 |
/* spans, in the case of an aa glyph bitmap, it will call */ |
|
1072 |
/* `black_spans', and `bit_test' and `bit_set' in the case of a */ |
|
1073 |
/* monochrome bitmap. This allows direct composition over a */ |
|
1074 |
/* pre-existing bitmap through user-provided callbacks to perform the */ |
|
1075 |
/* span drawing/composition. */ |
|
1076 |
/* */ |
|
1077 |
/* Note that the `bit_test' and `bit_set' callbacks are required when */ |
|
1078 |
/* rendering a monochrome bitmap, as they are crucial to implement */ |
|
1079 |
/* correct drop-out control as defined in the TrueType specification. */ |
|
1080 |
/* */ |
|
1081 |
typedef struct QT_FT_Raster_Params_ |
|
1082 |
{
|
|
1083 |
QT_FT_Bitmap* target; |
|
1084 |
void* source; |
|
1085 |
int flags; |
|
1086 |
QT_FT_SpanFunc gray_spans; |
|
1087 |
QT_FT_SpanFunc black_spans; |
|
1088 |
QT_FT_Raster_BitTest_Func bit_test; /* doesn't work! */ |
|
1089 |
QT_FT_Raster_BitSet_Func bit_set; /* doesn't work! */ |
|
1090 |
void* user; |
|
1091 |
QT_FT_BBox clip_box; |
|
1092 |
||
1093 |
} QT_FT_Raster_Params; |
|
1094 |
||
1095 |
||
1096 |
/*************************************************************************/ |
|
1097 |
/* */ |
|
1098 |
/* <FuncType> */ |
|
1099 |
/* QT_FT_Raster_NewFunc */ |
|
1100 |
/* */ |
|
1101 |
/* <Description> */ |
|
1102 |
/* A function used to create a new raster object. */ |
|
1103 |
/* */ |
|
1104 |
/* <Input> */ |
|
1105 |
/* memory :: A handle to the memory allocator. */ |
|
1106 |
/* */ |
|
1107 |
/* <Output> */ |
|
1108 |
/* raster :: A handle to the new raster object. */ |
|
1109 |
/* */ |
|
1110 |
/* <Return> */ |
|
1111 |
/* Error code. 0 means success. */ |
|
1112 |
/* */ |
|
1113 |
/* <Note> */ |
|
1114 |
/* The `memory' parameter is a typeless pointer in order to avoid */ |
|
1115 |
/* un-wanted dependencies on the rest of the FreeType code. In */ |
|
1116 |
/* practice, it is a QT_FT_Memory, i.e., a handle to the standard */ |
|
1117 |
/* FreeType memory allocator. However, this field can be completely */ |
|
1118 |
/* ignored by a given raster implementation. */ |
|
1119 |
/* */ |
|
1120 |
typedef int |
|
1121 |
(*QT_FT_Raster_NewFunc)( void* memory, |
|
1122 |
QT_FT_Raster* raster ); |
|
1123 |
||
1124 |
#define QT_FT_Raster_New_Func QT_FT_Raster_NewFunc |
|
1125 |
||
1126 |
/*************************************************************************/ |
|
1127 |
/* */ |
|
1128 |
/* <FuncType> */ |
|
1129 |
/* QT_FT_Raster_DoneFunc */ |
|
1130 |
/* */ |
|
1131 |
/* <Description> */ |
|
1132 |
/* A function used to destroy a given raster object. */ |
|
1133 |
/* */ |
|
1134 |
/* <Input> */ |
|
1135 |
/* raster :: A handle to the raster object. */ |
|
1136 |
/* */ |
|
1137 |
typedef void |
|
1138 |
(*QT_FT_Raster_DoneFunc)( QT_FT_Raster raster ); |
|
1139 |
||
1140 |
#define QT_FT_Raster_Done_Func QT_FT_Raster_DoneFunc |
|
1141 |
||
1142 |
/*************************************************************************/ |
|
1143 |
/* */ |
|
1144 |
/* <FuncType> */ |
|
1145 |
/* QT_FT_Raster_ResetFunc */ |
|
1146 |
/* */ |
|
1147 |
/* <Description> */ |
|
1148 |
/* FreeType provides an area of memory called the `render pool', */ |
|
1149 |
/* available to all registered rasters. This pool can be freely used */ |
|
1150 |
/* during a given scan-conversion but is shared by all rasters. Its */ |
|
1151 |
/* content is thus transient. */ |
|
1152 |
/* */ |
|
1153 |
/* This function is called each time the render pool changes, or just */ |
|
1154 |
/* after a new raster object is created. */ |
|
1155 |
/* */ |
|
1156 |
/* <Input> */ |
|
1157 |
/* raster :: A handle to the new raster object. */ |
|
1158 |
/* */ |
|
1159 |
/* pool_base :: The address in memory of the render pool. */ |
|
1160 |
/* */ |
|
1161 |
/* pool_size :: The size in bytes of the render pool. */ |
|
1162 |
/* */ |
|
1163 |
/* <Note> */ |
|
1164 |
/* Rasters can ignore the render pool and rely on dynamic memory */ |
|
1165 |
/* allocation if they want to (a handle to the memory allocator is */ |
|
1166 |
/* passed to the raster constructor). However, this is not */ |
|
1167 |
/* recommended for efficiency purposes. */ |
|
1168 |
/* */ |
|
1169 |
typedef void |
|
1170 |
(*QT_FT_Raster_ResetFunc)( QT_FT_Raster raster, |
|
1171 |
unsigned char* pool_base, |
|
1172 |
unsigned long pool_size ); |
|
1173 |
||
1174 |
#define QT_FT_Raster_Reset_Func QT_FT_Raster_ResetFunc |
|
1175 |
||
1176 |
/*************************************************************************/ |
|
1177 |
/* */ |
|
1178 |
/* <FuncType> */ |
|
1179 |
/* QT_FT_Raster_SetModeFunc */ |
|
1180 |
/* */ |
|
1181 |
/* <Description> */ |
|
1182 |
/* This function is a generic facility to change modes or attributes */ |
|
1183 |
/* in a given raster. This can be used for debugging purposes, or */ |
|
1184 |
/* simply to allow implementation-specific `features' in a given */ |
|
1185 |
/* raster module. */ |
|
1186 |
/* */ |
|
1187 |
/* <Input> */ |
|
1188 |
/* raster :: A handle to the new raster object. */ |
|
1189 |
/* */ |
|
1190 |
/* mode :: A 4-byte tag used to name the mode or property. */ |
|
1191 |
/* */ |
|
1192 |
/* args :: A pointer to the new mode/property to use. */ |
|
1193 |
/* */ |
|
1194 |
typedef int |
|
1195 |
(*QT_FT_Raster_SetModeFunc)( QT_FT_Raster raster, |
|
1196 |
unsigned long mode, |
|
1197 |
void* args ); |
|
1198 |
||
1199 |
#define QT_FT_Raster_Set_Mode_Func QT_FT_Raster_SetModeFunc |
|
1200 |
||
1201 |
/*************************************************************************/ |
|
1202 |
/* */ |
|
1203 |
/* <FuncType> */ |
|
1204 |
/* QT_FT_Raster_RenderFunc */ |
|
1205 |
/* */ |
|
1206 |
/* <Description> */ |
|
1207 |
/* Invokes a given raster to scan-convert a given glyph image into a */ |
|
1208 |
/* target bitmap. */ |
|
1209 |
/* */ |
|
1210 |
/* <Input> */ |
|
1211 |
/* raster :: A handle to the raster object. */ |
|
1212 |
/* */ |
|
1213 |
/* params :: A pointer to a QT_FT_Raster_Params structure used to store */ |
|
1214 |
/* the rendering parameters. */ |
|
1215 |
/* */ |
|
1216 |
/* <Return> */ |
|
1217 |
/* Error code. 0 means success. */ |
|
1218 |
/* */ |
|
1219 |
/* <Note> */ |
|
1220 |
/* The exact format of the source image depends on the raster's glyph */ |
|
1221 |
/* format defined in its QT_FT_Raster_Funcs structure. It can be an */ |
|
1222 |
/* QT_FT_Outline or anything else in order to support a large array of */ |
|
1223 |
/* glyph formats. */ |
|
1224 |
/* */ |
|
1225 |
/* Note also that the render function can fail and return a */ |
|
1226 |
/* QT_FT_Err_Unimplemented_Feature error code if the raster used does */ |
|
1227 |
/* not support direct composition. */ |
|
1228 |
/* */ |
|
1229 |
/* XXX: For now, the standard raster doesn't support direct */ |
|
1230 |
/* composition but this should change for the final release (see */ |
|
1231 |
/* the files demos/src/ftgrays.c and demos/src/ftgrays2.c for */ |
|
1232 |
/* examples of distinct implementations which support direct */ |
|
1233 |
/* composition). */ |
|
1234 |
/* */ |
|
1235 |
typedef int |
|
1236 |
(*QT_FT_Raster_RenderFunc)( QT_FT_Raster raster, |
|
1237 |
QT_FT_Raster_Params* params ); |
|
1238 |
||
1239 |
#define QT_FT_Raster_Render_Func QT_FT_Raster_RenderFunc |
|
1240 |
||
1241 |
/*************************************************************************/ |
|
1242 |
/* */ |
|
1243 |
/* <Struct> */ |
|
1244 |
/* QT_FT_Raster_Funcs */ |
|
1245 |
/* */ |
|
1246 |
/* <Description> */ |
|
1247 |
/* A structure used to describe a given raster class to the library. */ |
|
1248 |
/* */ |
|
1249 |
/* <Fields> */ |
|
1250 |
/* glyph_format :: The supported glyph format for this raster. */ |
|
1251 |
/* */ |
|
1252 |
/* raster_new :: The raster constructor. */ |
|
1253 |
/* */ |
|
1254 |
/* raster_reset :: Used to reset the render pool within the raster. */ |
|
1255 |
/* */ |
|
1256 |
/* raster_render :: A function to render a glyph into a given bitmap. */ |
|
1257 |
/* */ |
|
1258 |
/* raster_done :: The raster destructor. */ |
|
1259 |
/* */ |
|
1260 |
typedef struct QT_FT_Raster_Funcs_ |
|
1261 |
{
|
|
1262 |
QT_FT_Glyph_Format glyph_format; |
|
1263 |
QT_FT_Raster_NewFunc raster_new; |
|
1264 |
QT_FT_Raster_ResetFunc raster_reset; |
|
1265 |
QT_FT_Raster_SetModeFunc raster_set_mode; |
|
1266 |
QT_FT_Raster_RenderFunc raster_render; |
|
1267 |
QT_FT_Raster_DoneFunc raster_done; |
|
1268 |
||
1269 |
} QT_FT_Raster_Funcs; |
|
1270 |
||
1271 |
||
1272 |
/* */ |
|
1273 |
||
1274 |
||
1275 |
QT_FT_END_HEADER |
|
1276 |
||
1277 |
#endif /* __FTIMAGE_H__ */ |
|
1278 |
||
1279 |
||
1280 |
/* END */ |