annotate include/mb_shapes.h @ 427:8f900da42eed

Make sh_text_draw() passes first test case.
author Thinker K.F. Li <thinker@branda.to>
date Tue, 28 Jul 2009 15:11:42 +0800
parents 5791263ebe7b
children 9d5506968efb
rev   line source
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1 /*! \file
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2 * \brief Declare interfaces of shapes.
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3 *
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4 * \todo Add ellipse shape.
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5 * \todo Add circle shape.
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6 */
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7 #ifndef __SHAPES_H_
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8 #define __SHAPES_H_
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10 #include <cairo.h>
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11 #include "mb_types.h"
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12 #include "mb_redraw_man.h"
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13 #include "mb_img_ldr.h"
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14 #include <pango/pangocairo.h>
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16 /*! \page define_shape How to Define Shapes
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17 *
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18 * A shape implementation must include
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19 * - rdman_shape_*_new()
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20 * - clear memory for shape_t member.
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21 * - mb_obj_init() to initialize shape_t::obj.
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22 * - assign *_free() to \ref shape_t::free.
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23 * - make new object been managed by a redraw manager.
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24 * - call rdman_shape_man()
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25 * - *_free()
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26 * - assigned to \ref shape_t::free.
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27 * - *_transform()
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28 * - *_draw()
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29 * - *_draw() is responsive to define shape. How the shape is filled
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30 * or stroked is defined by paint.
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31 * - first member variable of a shape type must be a shape_t.
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32 *
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33 * Must modify
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34 * - event.c::draw_shape_path()
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35 * - redraw_man.c::clean_shape()
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36 * - redraw_man.c::draw_shape()
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37 *
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38 * \section shape_transform Shape Transform
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39 *
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40 * All shape types must have a shape transform function. It is invoked by
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41 * redraw_man.c::clean_shape(). It's task is to update \ref geo_t of the
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42 * shape object. In most situtation, it call geo_from_positions() to
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43 * update geo_t.
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44 *
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45 * \section rdman_man_shape Make a redraw manager managing a shape.
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46 *
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47 * It means managing life cycle of a shape to make a redraw manager
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48 * managing a shape. Shapes are referenced by a redraw manager to
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49 * update output device. So, a redraw manager must make sure all
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50 * shapes are valid when they are needed to update output. To make sure
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51 * lifecycle of shapes are synchronized with status of a redraw manager,
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52 * lifecycle of shapes are managed by associated redraw manager.
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53 *
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54 */
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56 /*! \defgroup shapes Shapes
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57 * @{
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58 */
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60 /*! \defgroup shape_path Shape of Path
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61 * @{
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62 */
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63 extern shape_t *rdman_shape_path_new(redraw_man_t *rdman, char *data);
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64 extern shape_t *rdman_shape_path_new_from_binary(redraw_man_t *rdman, char *commands, co_aix *arg,int arg_cnt,int *fix_arg,int fix_arg_cnt);
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65 extern void sh_path_transform(shape_t *shape);
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66 extern void sh_path_draw(shape_t *shape, cairo_t *cr);
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67 /* @} */
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69 /*! \defgroup shape_text Shape of Text
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70 * @{
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71 */
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72 extern shape_t *rdman_shape_text_new(redraw_man_t *rdman,
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73 const char *txt, co_aix x, co_aix y,
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74 co_aix font_size,
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75 cairo_font_face_t *face,PangoAttrList *attrs);
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76 /*! \brief Change the content of the text element.
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77 * In the SVG, the content of a text tag can be composed of several tspan inside it. The Madbutterfly parser will collect all content of a
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78 * text segement as a single string. The attribute of these characters are saved in a seperate data structure. In the program level, we will
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79 * not keep the SVG text tree. Instead, all attributes will be expanded into a list.
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80 *
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81 * When you change the content of a text element, please remember that the attributes will not be removed by the way. You need to change
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82 * them seperately.
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83 *
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84 */
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85 extern void sh_text_set_text(shape_t *shape, const char *txt);
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86
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87 extern void sh_text_transform(shape_t *shape);
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88 extern void sh_text_draw(shape_t *shape, cairo_t *cr);
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89 /* @} */
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91 /*! \defgroup mb_text_t Shape of Text
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92 * @{
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93 */
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94 #define TEXTSTYLE_BOLD 1
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95 #define TEXTSTYLE_ITALIC 2
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96 #define TEXTSTYLE_UNDERLINE 4
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97 #define TEXTSTYLE_COLOR 8
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98 #define TEXTSTYLE_FONT 0x10
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99 #define TEXTSTYLE_ALIGN 0x20
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101
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102 #define TEXTALIGN_START 1
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103 #define TEXTALIGN_MIDDLE 2
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104 #define TEXTALIGN_END 3
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105
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106 typedef struct {
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107 int property;
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108 unsigned int color;
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109 unsigned int align;
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110 char *font;
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111 } mb_textstyle_t;
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112
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113 typedef struct _textsegment {
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114 int x;
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115 int y;
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116 mb_textstyle_t style;
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117 int size;
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118 char *buf;
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119 struct _textsegment *next;
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120 } mb_text_segment_t;
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121
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122 #define MBTEXT_DIRTY 1
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123
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124 typedef struct {
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125 int nseg;
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126 mb_text_segment_t *segs;
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127 int flag;
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128 cairo_surface_t *surface;
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129 } mb_text_t;
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130
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131 /*! \brief Change the style of the text.
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132 *
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133 * This function can add a couple of attributes to a segment of text or the whole text field. If the @end is -1, the attributes
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134 * will be applied to the whole text field. The @style should be initialized by using the mb_textstyle_xxx functions. All attributes
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135 * which is not initialized will not be changed. It means that the @style will be added into all existing style instead of reaplcing
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136 * it.
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137 */
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138 extern void sh_text_set_style(shape_t *shape,int begin,int end,mb_textstyle_t *format);
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139 /*! \brief Change the color of the text field
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140 * Change the color of the whole text field. This will removed all existing color attribute. If you want to change part of the text
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141 * field only, please use the sh_text_set_style instead.
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142 */
292
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143 extern void sh_text_set_color(shape_t *shape, unsigned color);
293
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144 /*! \brief Turn on/off the bold attribute.
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145 * Turn on/off the font weight of the whole text field. This will removed all existing bold setting. If you want to change part of the text
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146 * field only, please use the sh_text_set_style instead.
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147 */
292
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148 extern void sh_text_set_bold(shape_t *shape, int bold);
293
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149 /*! \brief Turn on/off the italic attribute.
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150 * Turn on/off the italic of the whole text field. This will removed all existing italic setting. If you want to change part of the text
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151 * field only, please use the sh_text_set_style instead.
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152 */
292
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153 extern void sh_text_set_italic(shape_t *shape, int italic);
293
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154 /*! \brief Turn on/off the underline attribute.
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155 * Turn on/off the underline of the whole text field. This will removed all existing underline setting. If you want to change part of the text
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156 * field only, please use the sh_text_set_style instead.
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157 */
292
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158 extern void sh_text_set_underline(shape_t *shape, int underline);
293
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159 /*! \brief Change the font of the text field.
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160 * Change the font of the whole text field. This will removed all existing underline setting. If you want to change part of the text
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161 * field only, please use the sh_text_set_style instead.
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162 */
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163 extern void sh_text_set_font(shape_t *shape, char *family);
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164 /*! \brief Init the text style data structure.
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165 *
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166 * This is usually used to initialize the mb_textstyle_t which is allocate in the stack. It will mark all property as undefined. All undefined
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167 * property will not change when the sh_text_set_style is called.
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168 *
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169 */
291
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170 static inline void mb_textstyle_init(mb_textstyle_t *style)
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171 {
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172 style->property = 0;
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173 }
278
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174 extern void mb_textstyle_set_font(mb_textstyle_t *style, char *font);
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175 static inline char *mb_textstyle_get_font(mb_textstyle_t *style)
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176 {
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177 if (style->property & TEXTSTYLE_FONT)
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178 return style->font;
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179 else
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180 return NULL;
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181 }
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182 extern void mb_textstyle_set_bold(mb_textstyle_t *style, int bold);
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183 static inline int mb_textstyle_get_bold(mb_textstyle_t *style)
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184 {
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185 return style->property & TEXTSTYLE_BOLD;
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186 }
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187 extern void mb_textstyle_set_italic(mb_textstyle_t *style, int italic);
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188 static inline int mb_textstyle_get_italic(mb_textstyle_t *style)
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189 {
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190 return style->property & TEXTSTYLE_ITALIC;
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191 }
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192 extern void mb_textstyle_set_underline(mb_textstyle_t *style, int underline);
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193 static inline int mb_textstyle_get_undeline(mb_textstyle_t *style)
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194 {
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195 return style->property & TEXTSTYLE_UNDERLINE;
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196 }
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197 #define TEXTCOLOR_RED(c) (((c)&0xff0000)>>16)
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198 #define TEXTCOLOR_GREEN(c) (((c)&0xff00)>>8)
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199 #define TEXTCOLOR_BLUE(c) (((c)&0xff))
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200 #define TEXTCOLOR_RGB(r,g,b) (((r)<<16)|((g)<<8)|(b))
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201 static inline void mb_textstyle_set_color(mb_textstyle_t *style, unsigned int color)
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202 {
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203 style->property |= TEXTSTYLE_COLOR;
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204 style->color = color;
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205 }
278
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206 static inline unsigned int mb_textstyle_get_color(mb_textstyle_t *style)
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207 {
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208 if (style->property & TEXTSTYLE_COLOR)
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209 return style->color;
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210 else
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211 return 0;
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212 }
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213
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214 static inline int mb_textstyle_has_color(mb_textstyle_t *style)
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215 {
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216 return style->property & TEXTSTYLE_COLOR;
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217 }
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218 extern void mb_textstyle_set_alignment(mb_textstyle_t *style, int alignment);
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219 extern int mb_textstyle_get_alignment(mb_textstyle_t *style);
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220
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221
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222
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223 extern void mb_text_set_style(mb_text_t *text, int begin,int end,mb_textstyle_t *style);
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224 extern void mb_text_get_style(mb_text_t *text, int n,mb_textstyle_t *style);
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225 extern void mb_text_set_text(mb_text_t *text, char *string,int begin,int end);
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226 extern void mb_text_get_text(mb_text_t *text, int begin,int end, char *string);
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227
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228
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229 /* @} */
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230
101
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231 /*! \defgroup shape_rect Shape of Rectangle
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232 * @{
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233 */
159
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234 extern shape_t *rdman_shape_rect_new(redraw_man_t *rdman,
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235 co_aix x, co_aix y,
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236 co_aix w, co_aix h,
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237 co_aix rx, co_aix ry);
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238 extern void sh_rect_transform(shape_t *shape);
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239 extern void sh_rect_draw(shape_t *shape, cairo_t *cr);
40
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240 extern void sh_rect_set(shape_t *shape, co_aix x, co_aix y,
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241 co_aix w, co_aix h, co_aix rx, co_aix ry);
101
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242 /* @} */
257
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243
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244 /*! \defgroup shape_image Shape of Image
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245 * @{
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246 */
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247 extern shape_t *rdman_shape_image_new(redraw_man_t *rdman,
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248 co_aix x, co_aix y,
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249 co_aix w, co_aix h);
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250 extern void sh_image_transform(shape_t *shape);
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251 extern void sh_image_draw(shape_t *shape, cairo_t *cr);
265
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252 extern void sh_image_set_geometry(shape_t *shape, co_aix x, co_aix y,
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253 co_aix w, co_aix h);
257
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254 /* @} */
393
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255
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256 /*! \defgroup shape_stext A Simple Implementation of Shape of Image
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257 * @{
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258 */
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259
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260 /*! \defgroup font_face Define font face used to describe style of text.
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261 * @{
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262 */
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263 /*! \brief Font face of MadButterfly.
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264 *
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265 * It actully a cairo_font_face_t, now. But, it can be change for latter.
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266 * So, programmer should not depend on cairo_font_face_t.
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267 */
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268 typedef struct _mb_font_face mb_font_face_t;
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269
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270 enum MB_FONT_SLANTS {
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271 MB_FONT_SLANT_DUMMY,
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272 MB_FONT_SLANT_ROMAN,
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273 MB_FONT_SLANT_ITALIC,
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274 MB_FONT_SLANT_OBLIQUE,
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275 MB_FONT_SLANT_MAX
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276 };
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277
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278 extern mb_font_face_t *mb_font_face_query(redraw_man_t *rdman,
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279 const char *family,
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280 int slant,
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281 int weight);
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282 extern void mb_font_face_free(mb_font_face_t *face);
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283 /* @} */
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284
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285 /*! \brief Describe style of a block of text.
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286 *
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287 * \ref sh_stext_t describes style of a text by a list of
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288 * \ref mb_style_blk_t.
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289 */
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290 typedef struct {
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291 int n_chars;
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292 mb_font_face_t *face;
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293 co_aix font_sz;
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294 } mb_style_blk_t;
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295
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296 extern shape_t *rdman_shape_stext_new(redraw_man_t *rdman,
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297 co_aix x, co_aix y,
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298 const char *txt);
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299 extern void sh_stext_transform(shape_t *shape);
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300 extern void sh_stext_draw(shape_t *shape, cairo_t *cr);
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301 extern int sh_stext_set_text(shape_t *shape, const char *txt);
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302 extern int sh_stext_set_style(shape_t *shape,
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303 const mb_style_blk_t *blks,
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304 int nblks);
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305
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306 /* @} */
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307 /* @} */
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308
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309 #endif /* __SHAPES_H_ */