2015-12-10 05:06:13 +02:00
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/****************************************************************************
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**
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** Copyright (C) 2015 The Qt Company Ltd.
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2019-06-03 13:38:02 +00:00
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** Copyright (C) 2016-2019 Ivailo Monev
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2015-12-10 05:06:13 +02:00
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**
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2019-06-03 13:38:02 +00:00
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** This file is part of the QtGui module of the Katie Toolkit.
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2015-12-10 05:06:13 +02:00
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**
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** $QT_BEGIN_LICENSE:LGPL$
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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 or version 3 as published by the Free
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** Software Foundation and appearing in the file LICENSE.LGPLv21 and
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** LICENSE.LGPLv3 included in the packaging of this file. Please review the
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** following information to ensure the GNU Lesser General Public License
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** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
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** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** As a special exception, The Qt Company gives you certain additional
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** rights. These rights are described in The Qt Company 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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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3.0 as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU General Public License version 3.0 requirements will be
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** met: http://www.gnu.org/copyleft/gpl.html.
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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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#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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2019-06-03 13:38:02 +00:00
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// This file is not part of the Katie API. It exists purely as an
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2015-12-10 05:06:13 +02:00
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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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2019-05-13 22:39:47 +00:00
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QT_FT_BEGIN_HEADER
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2015-12-10 05:06:13 +02:00
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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 int 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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2019-05-13 22:39:47 +00:00
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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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2015-12-10 05:06:13 +02:00
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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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/* <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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/* */
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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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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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/*************************************************************************/
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/* */
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/* <Enum> */
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2016-06-28 13:49:11 +00:00
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/* QT_FT_OUTLINE_FLAGS */
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2015-12-10 05:06:13 +02:00
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/* */
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/* <Description> */
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/* A list of bit-field constants use for the flags in an outline's */
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/* `flags' field. */
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/* */
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/* <Values> */
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2016-06-28 13:49:11 +00:00
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/* QT_FT_OUTLINE_NONE :: Value 0 is reserved. */
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2015-12-10 05:06:13 +02:00
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/* */
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/* QT_FT_OUTLINE_EVEN_ODD_FILL :: By default, outlines are filled using */
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/* the non-zero winding rule. If set to */
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/* 1, the outline will be filled using */
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/* the even-odd fill rule (only works */
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/* with the smooth raster). */
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#define QT_FT_OUTLINE_NONE 0x0
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#define QT_FT_OUTLINE_EVEN_ODD_FILL 0x2
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/* */
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#define QT_FT_CURVE_TAG( flag ) ( flag & 3 )
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#define QT_FT_CURVE_TAG_ON 1
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#define QT_FT_CURVE_TAG_CUBIC 2
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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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/*************************************************************************/
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/***** *****/
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/***** R A S T E R D E F I N I T I O N S *****/
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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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/* A raster is a scan converter, in charge of rendering an outline into */
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/* a a bitmap. This section contains the public API for rasters. */
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/* */
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/* Note that in FreeType 2, all rasters are now encapsulated within */
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/* specific modules called `renderers'. See `freetype/ftrender.h' for */
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/* more details on renderers. */
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/* */
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/*************************************************************************/
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/*************************************************************************/
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/* */
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/* <Section> */
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/* raster */
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/* */
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/* <Title> */
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/* Scanline converter */
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/* */
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/* <Abstract> */
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/* How vectorial outlines are converted into bitmaps and pixmaps. */
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/* */
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/* <Description> */
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/* This section contains technical definitions. */
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/* */
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/*************************************************************************/
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2019-05-13 22:39:47 +00:00
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/*************************************************************************/
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/* */
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/* <Type> */
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/* QT_FT_Raster */
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/* */
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/* <Description> */
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/* A handle (pointer) to a raster object. Each object can be used */
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/* independently to convert an outline into a bitmap or pixmap. */
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/* */
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typedef struct TRaster_ *QT_FT_Raster;
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|
2015-12-10 05:06:13 +02:00
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/*************************************************************************/
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/* */
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/* <Struct> */
|
2016-06-28 13:49:11 +00:00
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/* QT_FT_Span */
|
2015-12-10 05:06:13 +02:00
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/* */
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/* <Description> */
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/* A structure used to model a single span of gray (or black) pixels */
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/* when rendering a monochrome or anti-aliased bitmap. */
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/* */
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/* <Fields> */
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/* x :: The span's horizontal start position. */
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/* */
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/* len :: The span's length in pixels. */
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/* */
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/* coverage :: The span color/coverage, ranging from 0 (background) */
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/* to 255 (foreground). Only used for anti-aliased */
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/* rendering. */
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/* */
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/* <Note> */
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/* This structure is used by the span drawing callback type named */
|
2016-06-28 13:49:11 +00:00
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/* QT_FT_SpanFunc which takes the y-coordinate of the span as a */
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2015-12-10 05:06:13 +02:00
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/* a parameter. */
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/* */
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/* The coverage value is always between 0 and 255, even if the number */
|
2016-06-28 13:49:11 +00:00
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/* of gray levels have been set through QT_FT_Set_Gray_Levels(). */
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2015-12-10 05:06:13 +02:00
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/* */
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typedef struct QT_FT_Span_
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{
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short x;
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unsigned short len;
|
2019-05-13 22:39:47 +00:00
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short y;
|
2015-12-10 05:06:13 +02:00
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unsigned char coverage;
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} QT_FT_Span;
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/*************************************************************************/
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/* */
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/* <FuncType> */
|
2016-06-28 13:49:11 +00:00
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/* QT_FT_SpanFunc */
|
2015-12-10 05:06:13 +02:00
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/* */
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/* <Description> */
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/* A function used as a call-back by the anti-aliased renderer in */
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/* order to let client applications draw themselves the gray pixel */
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/* spans on each scan line. */
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/* */
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/* <Input> */
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/* y :: The scanline's y-coordinate. */
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/* */
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|
/* count :: The number of spans to draw on this scanline. */
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/* */
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|
|
/* spans :: A table of `count' spans to draw on the scanline. */
|
|
|
|
|
/* */
|
|
|
|
|
/* user :: User-supplied data that is passed to the callback. */
|
|
|
|
|
/* */
|
|
|
|
|
/* <Note> */
|
|
|
|
|
/* This callback allows client applications to directly render the */
|
|
|
|
|
/* gray spans of the anti-aliased bitmap to any kind of surfaces. */
|
|
|
|
|
/* */
|
|
|
|
|
/* This can be used to write anti-aliased outlines directly to a */
|
|
|
|
|
/* given background bitmap, and even perform translucency. */
|
|
|
|
|
/* */
|
|
|
|
|
/* Note that the `count' field cannot be greater than a fixed value */
|
2016-06-28 13:49:11 +00:00
|
|
|
/* defined by the QT_FT_MAX_GRAY_SPANS configuration macro in */
|
2015-12-10 05:06:13 +02:00
|
|
|
/* ftoption.h. By default, this value is set to 32, which means that */
|
|
|
|
|
/* if there are more than 32 spans on a given scanline, the callback */
|
|
|
|
|
/* will be called several times with the same `y' parameter in order */
|
|
|
|
|
/* to draw all callbacks. */
|
|
|
|
|
/* */
|
|
|
|
|
/* Otherwise, the callback is only called once per scan-line, and */
|
|
|
|
|
/* only for those scanlines that do have `gray' pixels on them. */
|
|
|
|
|
/* */
|
|
|
|
|
typedef void
|
|
|
|
|
(*QT_FT_SpanFunc)(int count,
|
|
|
|
|
const QT_FT_Span* spans,
|
|
|
|
|
void* worker);
|
|
|
|
|
|
2019-05-13 22:39:47 +00:00
|
|
|
|
|
|
|
|
/*************************************************************************/
|
|
|
|
|
/* */
|
|
|
|
|
/* <Struct> */
|
|
|
|
|
/* QT_FT_Raster_Params */
|
|
|
|
|
/* */
|
|
|
|
|
/* <Description> */
|
|
|
|
|
/* A structure to hold the arguments used by a raster's render */
|
|
|
|
|
/* function. */
|
|
|
|
|
/* */
|
|
|
|
|
/* <Fields> */
|
|
|
|
|
/* target :: The target bitmap. */
|
|
|
|
|
/* */
|
|
|
|
|
/* source :: A pointer to the source glyph image (e.g. an */
|
|
|
|
|
/* QT_FT_Outline). */
|
|
|
|
|
/* */
|
|
|
|
|
/* flags :: The rendering flags. */
|
|
|
|
|
/* */
|
|
|
|
|
/* gray_spans :: The gray span drawing callback. */
|
|
|
|
|
/* */
|
|
|
|
|
/* black_spans :: The black span drawing callback. */
|
|
|
|
|
/* */
|
|
|
|
|
/* user :: User-supplied data that is passed to each drawing */
|
|
|
|
|
/* callback. */
|
|
|
|
|
/* */
|
|
|
|
|
/* clip_box :: An optional clipping box. It is only used in */
|
|
|
|
|
/* direct rendering mode. Note that coordinates here */
|
|
|
|
|
/* should be expressed in _integer_ pixels (and not in */
|
|
|
|
|
/* 26.6 fixed-point units). */
|
|
|
|
|
/* */
|
|
|
|
|
/* <Note> */
|
|
|
|
|
/* An anti-aliased glyph bitmap is drawn if the QT_FT_RASTER_FLAG_AA bit */
|
|
|
|
|
/* flag is set in the `flags' field, otherwise a monochrome bitmap */
|
|
|
|
|
/* will be generated. */
|
|
|
|
|
/* */
|
|
|
|
|
/* If the QT_FT_RASTER_FLAG_DIRECT bit flag is set in `flags', the */
|
|
|
|
|
/* raster will call the `gray_spans' callback to draw gray pixel */
|
|
|
|
|
/* spans, in the case of an aa glyph bitmap, it will call */
|
|
|
|
|
/* `black_spans' in the case of a monochrome bitmap. This allows */
|
|
|
|
|
/* direct composition over a pre-existing bitmap through */
|
|
|
|
|
/* user-provided callbacks to perform the span drawing/composition. */
|
|
|
|
|
/* */
|
|
|
|
|
/* Note that the `bit_test' and `bit_set' callbacks are required when */
|
|
|
|
|
/* rendering a monochrome bitmap, as they are crucial to implement */
|
|
|
|
|
/* correct drop-out control as defined in the TrueType specification. */
|
|
|
|
|
/* */
|
|
|
|
|
typedef struct QT_FT_Raster_Params_
|
|
|
|
|
{
|
2019-06-07 13:57:20 +00:00
|
|
|
QT_FT_Outline* source;
|
2019-05-13 22:39:47 +00:00
|
|
|
QT_FT_SpanFunc gray_spans;
|
|
|
|
|
void* user;
|
|
|
|
|
QT_FT_BBox clip_box;
|
|
|
|
|
|
|
|
|
|
} QT_FT_Raster_Params;
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/*************************************************************************/
|
|
|
|
|
/* */
|
|
|
|
|
/* <Func> */
|
|
|
|
|
/* gray_raster_reset */
|
|
|
|
|
/* */
|
|
|
|
|
/* <Description> */
|
|
|
|
|
/* FreeType provides an area of memory called the `render pool', */
|
|
|
|
|
/* available to all registered rasters. This pool can be freely used */
|
|
|
|
|
/* during a given scan-conversion but is shared by all rasters. Its */
|
|
|
|
|
/* content is thus transient. */
|
|
|
|
|
/* */
|
|
|
|
|
/* This function is called each time the render pool changes, or just */
|
|
|
|
|
/* after a new raster object is created. */
|
|
|
|
|
/* */
|
|
|
|
|
/* <Note> */
|
|
|
|
|
/* Rasters can ignore the render pool and rely on dynamic memory */
|
|
|
|
|
/* allocation if they want to (a handle to the memory allocator is */
|
|
|
|
|
/* passed to the raster constructor). However, this is not */
|
|
|
|
|
/* recommended for efficiency purposes. */
|
|
|
|
|
/* */
|
|
|
|
|
#ifdef __cplusplus
|
|
|
|
|
extern "C"
|
|
|
|
|
#endif
|
|
|
|
|
void gray_raster_reset( );
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/*************************************************************************/
|
|
|
|
|
/* */
|
|
|
|
|
/* <Func> */
|
|
|
|
|
/* gray_raster_render */
|
|
|
|
|
/* */
|
|
|
|
|
/* <Description> */
|
|
|
|
|
/* Invokes a given raster to scan-convert a given glyph image into a */
|
|
|
|
|
/* target bitmap. */
|
|
|
|
|
/* */
|
|
|
|
|
/* <Input> */
|
|
|
|
|
/* raster :: A handle to the raster object. */
|
|
|
|
|
/* */
|
|
|
|
|
/* params :: A pointer to a QT_FT_Raster_Params structure used to store */
|
|
|
|
|
/* the rendering parameters. */
|
|
|
|
|
/* */
|
|
|
|
|
/* <Return> */
|
|
|
|
|
/* Error code. 0 means success. */
|
|
|
|
|
/* */
|
|
|
|
|
/* <Note> */
|
|
|
|
|
/* The exact format of the source image depends on the raster's glyph */
|
|
|
|
|
/* format defined in its QT_FT_Raster_Funcs structure. It can be an */
|
|
|
|
|
/* QT_FT_Outline or anything else in order to support a large array of */
|
|
|
|
|
/* glyph formats. */
|
|
|
|
|
/* */
|
|
|
|
|
/* Note also that the render function can fail and return a */
|
|
|
|
|
/* QT_FT_Err_Unimplemented_Feature error code if the raster used does */
|
|
|
|
|
/* not support direct composition. */
|
|
|
|
|
/* */
|
|
|
|
|
/* XXX: For now, the standard raster doesn't support direct */
|
|
|
|
|
/* composition but this should change for the final release (see */
|
|
|
|
|
/* the files demos/src/ftgrays.c and demos/src/ftgrays2.c for */
|
|
|
|
|
/* examples of distinct implementations which support direct */
|
|
|
|
|
/* composition). */
|
|
|
|
|
/* */
|
|
|
|
|
#ifdef __cplusplus
|
|
|
|
|
extern "C"
|
|
|
|
|
#endif
|
|
|
|
|
int gray_raster_render( const QT_FT_Raster_Params* params );
|
|
|
|
|
|
|
|
|
|
/*************************************************************************/
|
|
|
|
|
/* */
|
|
|
|
|
/* Minimum buffer size for raster object, that accounts for TWorker and */
|
|
|
|
|
/* TCell sizes. */
|
|
|
|
|
/* */
|
|
|
|
|
#define RASTER_POOL_SIZE 8192
|
|
|
|
|
|
2016-09-24 15:27:59 +00:00
|
|
|
/*************************************************************************/
|
|
|
|
|
/* */
|
|
|
|
|
/* Any higher and rasterization of shapes will produce incorrect */
|
|
|
|
|
/* results. */
|
|
|
|
|
/* */
|
|
|
|
|
#define RASTER_COORD_LIMIT 32767
|
|
|
|
|
|
2015-12-10 05:06:13 +02:00
|
|
|
/* */
|
|
|
|
|
|
2019-05-13 22:39:47 +00:00
|
|
|
|
|
|
|
|
QT_FT_END_HEADER
|
|
|
|
|
|
2015-12-10 05:06:13 +02:00
|
|
|
#endif /* __FTIMAGE_H__ */
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/* END */
|
