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annotate src/shape_stext.c @ 407:92a459a1c5aa

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author Thinker K.F. Li <thinker@branda.to>
date Tue, 07 Jul 2009 22:45:12 +0800
parents aee0f66b1154
children 1a923ea699c1
rev   line source
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7fe0b1ee92b6 Add extents supporting into Fontconfig and FreeType Layer
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diff changeset
1 #ifdef SHAPE_STEXT
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2
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3 #include <stdio.h>
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4 #include <cairo.h>
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5 #include <cairo-ft.h>
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6 #include <fontconfig/fontconfig.h>
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7 #include "mb_shapes.h"
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8
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9 #ifndef ASSERT
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10 #define ASSERT(x)
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11 #endif
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12 #define OK 0
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13 #define ERR -1
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14
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15 /*! \page stext Simple Text
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16 *
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17 * A sh_stext_t is broken into fragments. Each fragment comprises the text
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18 * and the styles applied on the fragement. The styles determines font face
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19 * used to show the text. The fragment of text with styles is called
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20 * styled block.
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21 */
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22
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23 /*! \defgroup fontconfig_freetype Fontconfig and FreeType Layer.
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24 *
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25 * This layer implements a font provider to reset of the system.
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26 * It bases on fontconfig and FreeType supporting of Cairo.
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27 *
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28 * @{
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29 */
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30 /*! \brief Stakeholder of scaled font.
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31 *
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32 * It is actually a cairo_scaled_font_t, now. But, it should not be
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33 * noticed by out-siders. Only \ref fontconfig_freetype
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34 * should known it.
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35 */
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36 typedef struct _mb_scaled_font mb_scaled_font_t;
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37
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38 /*! \brief Stakeholder of scaled font.
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39 *
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40 * Although, mb_text_extents_t is defined as a cairo_scaled_font_t, but
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41 * programmers should assume it is opague.
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42 *
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43 * An extents is the span of showing a fragement of text on the output device.
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44 * It includes x and y advance of cursor after showinng the text.
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45 * The cursor maybe not really existed. But, the advance is computed as
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46 * the cursor existed. It also includes width and height of the text.
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47 * The bearing of a styled block is the left-top corner of the bounding box.
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48 * The bounding box of a styled block is the minimal rectangle, on the
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49 * output device, that can contain the text. The bearing is related to
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50 * the base line for an extents.
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51 */
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52 typedef cairo_text_extents_t mb_text_extents_t;
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53
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54 #define MBE_GET_X_ADV(ext) ((ext)->x_advance)
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55 #define MBE_GET_Y_ADV(ext) ((ext)->y_advance)
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55f38c2cdb8f Refactor function of computing text extents
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56 #define MBE_GET_X_BEARING(ext) ((ext)->x_bearing)
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57 #define MBE_GET_Y_BEARING(ext) ((ext)->y_bearing)
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58 #define MBE_GET_WIDTH(ext) ((ext)->width)
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59 #define MBE_GET_HEIGHT(ext) ((ext)->height)
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60 #define MBE_SET_X_ADV(ext, v) do { ((ext)->x_advance) = v; } while(0)
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61 #define MBE_SET_Y_ADV(ext, v) do { ((ext)->y_advance) = v; } while(0)
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62 #define MBE_SET_X_BEARING(ext, v) do { ((ext)->x_bearing) = v; } while(0)
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63 #define MBE_SET_Y_BEARING(ext, v) do { ((ext)->y_bearing) = v; } while(0)
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64 #define MBE_SET_WIDTH(ext, v) do { ((ext)->width) = v; } while(0)
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65 #define MBE_SET_HEIGHT(ext, v) do { ((ext)->height) = v; } while(0)
396
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66
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67 /*! \brief Find out a font pattern.
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68 *
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69 * This function use fontconfig to decide a font file in pattern. It can
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70 * replaced by other mechanism if you think it is not what you want.
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71 */
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72 static
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73 FcPattern *query_font_pattern(const char *family, int slant, int weight) {
394
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74 FcPattern *ptn, *p;
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75 FcValue val;
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76 FcConfig *cfg;
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77 FcBool r;
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78 static int slant_map[] = { /* from MB_FONT_SLANT_* to FC_SLANT_* */
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79 FC_SLANT_ROMAN,
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80 FC_SLANT_ROMAN,
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81 FC_SLANT_ITALIC,
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82 FC_SLANT_OBLIQUE};
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83
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84 cfg = FcConfigGetCurrent();
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85 ptn = FcPatternCreate();
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86 p = FcPatternCreate();
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87 if(ptn == NULL || p == NULL)
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88 goto err;
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89
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90 val.type = FcTypeString;
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91 val.u.s = family;
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92 FcPatternAdd(ptn, "family", &val, FcTrue);
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93
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94 val.type = FcTypeInteger;
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95 val.u.i = slant_map[slant];
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96 FcPatternAdd(ptn, "slant", &val, FcTrue);
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97
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98 val.type = FcTypeInteger;
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99 val.u.i = weight;
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100 FcPatternAdd(ptn, "weight", &val, FcTrue);
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101
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102 r = FcConfigSubstituteWithPat(cfg, ptn, NULL, FcMatchPattern);
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103 if(!r)
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104 goto err;
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105
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106 r = FcConfigSubstituteWithPat(cfg, p, ptn, FcMatchFont);
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107 if(!r)
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108 goto err;
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109
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110 FcDefaultSubstitute(p);
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111
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112 FcPatternDestroy(ptn);
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113
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114 return p;
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115
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116 err:
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117 if(ptn)
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118 FcPatternDestroy(ptn);
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119 if(p)
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120 FcPatternDestroy(p);
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121 return NULL;
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122
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123 }
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124
395
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125 /*! \brief Find out a font face for a pattern specified.
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126 *
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127 * The pattern, here, is a vector of family, slant, and weight.
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128 * This function base on fontconfig and cairo FreeType font supporting.
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129 * You can replace this function with other font mechanisms.
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130 */
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131 static
396
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132 mb_font_face_t *query_font_face(const char *family, int slant, int weight) {
395
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133 cairo_font_face_t *cface;
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134 FcPattern *ptn;
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135
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136 ptn = query_font_pattern(family, slant, weight);
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137 cface = cairo_ft_font_face_create_for_pattern(ptn);
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138 FcPatternDestroy(ptn);
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139
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140 return (mb_font_face_t *)cface;
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141 }
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142
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143 static
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144 void free_font_face(mb_font_face_t *face) {
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145 ASSERT(face == NULL);
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146
396
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147 cairo_font_face_destroy((cairo_font_face_t *)face);
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148 }
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149
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150 /*! \brief This is scaled font for specified size and extent.
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151 *
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152 * Font face only specified which font would be used to draw text
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153 * message. But, it also need to scale glyphs to specified size and
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154 * rotation. This function return a scaled font specified by a
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155 * matrix that transform glyph from design space of the font to
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156 * user space of cairo surface.
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157 */
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158 static
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159 mb_scaled_font_t *make_scaled_font_face_matrix(mb_font_face_t *face,
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160 co_aix *matrix) {
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161 cairo_font_face_t *scaled_font;
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162 cairo_matrix_t font_matrix;
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163 static cairo_matir_t id = {
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164 1, 0,
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165 0, 1,
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166 0, 0
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167 };
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168 static cairo_font_options_t *opt = NULL;
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169
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170 ASSERT(matrix != NULL);
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171
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172 if(opt == NULL) {
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173 opt = cairo_font_options_create();
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174 if(opt == NULL)
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175 return NULL;
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176 }
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177
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178 font_matrix.xx = *matrix++;
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179 font_matrix.xy = *matrix++;
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180 font_matrix.x0 = *matrix++;
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181 font_matrix.yx = *matrix++;
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182 font_matrix.yy = *matrix++;
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183 font_matrix.y0 = *matrix;
396
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184 scaled_font = cairo_scaled_font_create((cairo_font_face_t *)face,
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185 &font_matrix,
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186 &id, opt);
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187
396
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188 return (mb_scaled_font_t *)scaled_font;
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189 }
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190
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191 static
397
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192 void scaled_font_free(mb_scaled_font_t *scaled_font) {
396
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193 cairo_scaled_font_destroy((cairo_scaled_font_t *)scaled_font);
395
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194 }
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195
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196 static
397
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197 void compute_text_extents(mb_scaled_font_t *scaled_font, const char *txt,
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198 mb_text_extents_t *extents) {
396
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199 cairo_scaled_font_text_extents((cairo_scaled_font_t *)scaled_font,
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200 txt,
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201 (cairo_text_extents_t *)extents);
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202 }
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203
396
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204 static
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205 mb_text_extents_t *mb_text_extents_new(void) {
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206 cairo_text_extents_t *extents;
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207
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208 extents = (cairo_text_extents_t *)malloc(sizeof(cairo_text_extents_t));
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209 return extents;
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210 }
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211
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212 static
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213 void mb_text_extents_free(mb_text_extents_t *extents) {
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214 free(extents);
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215 }
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216
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217 /* @} */
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218
393
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219 /*! \brief Query and return a font face for a specified attribute vector.
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220 *
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221 * Programmers use mb_font_face_t to specify fonts used to show a
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222 * block of text on the output device. They can get mb_font_face_t with
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223 * this function. The objects return by mb_font_face_query() should be
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224 * freed with mb_font_face_free() when they are not more used.
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225 *
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226 * \param family is the name of a font family (times).
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227 * \param slant is one of \ref MB_FONT_SLANTS.
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228 * \param weight decides if a font is thin or heavy.
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229 */
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230 mb_font_face_t *mb_font_face_query(redraw_man_t *rdman,
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231 const char *family,
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232 int slant,
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233 int weight) {
396
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234 return query_font_face(family, slant, weight);
393
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235 }
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236
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237 void mb_font_face_free(mb_font_face_t *face) {
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238 ASSERT(face != NULL);
396
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239 free_font_face(face);
393
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240 }
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241
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242 /*! \brief A simple implementation of text shape.
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243 *
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244 */
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245 typedef struct _sh_stext {
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246 shape_t shape;
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247 const char *txt; /*!< \brief Text to be showed */
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248 const mb_style_blk_t *style_blks; /*!< \brief Style of text */
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249 int nblks; /*!< \brief Number of style blocks */
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250 int max_nblks;
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251 co_aix x, y;
396
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252 mb_scaled_font_t **scaled_fonts;
403
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253 mb_text_extents_t extents;
393
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254 } sh_stext_t;
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255
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256 shape_t *rdman_shape_stext_new(redraw_man_t *rdman, co_aix x, co_aix y,
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257 const char *txt) {
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258 sh_stext_t *txt_o;
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259
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260 ASSERT(txt != NULL);
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261
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262 txt_o = (sh_stext_t *)malloc(sizeof(sh_stext_t));
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263 if(txt_o == NULL)
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264 return NULL;
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265
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266 memset(&txt_o->shape, 0, sizeof(shape_t));
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Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
267 mb_obj_init(txt_o, MBO_STEXT);
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Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
268
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
269 txt_o->txt = strdup(txt);
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
270 txt_o->style_blks = NULL;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
271 txt_o->nblks = 0;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
272 txt_o->max_nblks = 0;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
273 txt_o->x = x;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
274 txt_o->y = y;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
275 txt_o->exts = NULL;
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Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
276
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
277 if(txt_o->txt == NULL) {
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
278 free(txt_o);
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
279 txt_o = NULL;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
280 }
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
281
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
282 return (shape_t *)txt_o;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
283 }
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
284
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
285 static
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
286 int compute_utf8_chars_sz(const char *txt, int n_chars) {
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
287 int i;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
288 const char *p = txt;
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parents:
diff changeset
289
27774b93521e Add sh_stext_t to implement a simple version of text shape.
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parents:
diff changeset
290 for(i = 0; i < n && *p; i++) {
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
291 if(*p++ & 0x80)
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Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
292 continue; /* single byte */
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parents:
diff changeset
293 /* multi-bytes */
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Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
294 while(*p && ((*p & 0xc0) == 0x80))
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Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
295 p++;
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Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
296 }
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
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diff changeset
297 if(i < n)
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parents:
diff changeset
298 return ERR;
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299
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Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
300 return p - txt;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
301 }
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Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
302
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
303 static
397
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Thinker K.F. Li <thinker@branda.to>
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diff changeset
304 mb_scaled_font_t *make_scaled_font_face(sh_stext_t *txt_o,
393
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
305 cairo_font_face_t *face,
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
306 co_aix shift_x, co_aix shift_y,
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
307 co_aix font_sz) {
397
55f38c2cdb8f Refactor function of computing text extents
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parents: 396
diff changeset
308 co_aix matrix[6], scaled_matrix[6];
55f38c2cdb8f Refactor function of computing text extents
Thinker K.F. Li <thinker@branda.to>
parents: 396
diff changeset
309 co_aix *aggr;
55f38c2cdb8f Refactor function of computing text extents
Thinker K.F. Li <thinker@branda.to>
parents: 396
diff changeset
310 mb_scaled_font_t *scaled;
393
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Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
311
397
55f38c2cdb8f Refactor function of computing text extents
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parents: 396
diff changeset
312 aggr = sh_get_aggr_matrix((shape_t *)txt_o);
55f38c2cdb8f Refactor function of computing text extents
Thinker K.F. Li <thinker@branda.to>
parents: 396
diff changeset
313 matrix[0] = font_sz;
55f38c2cdb8f Refactor function of computing text extents
Thinker K.F. Li <thinker@branda.to>
parents: 396
diff changeset
314 matrix[1] = 0;
55f38c2cdb8f Refactor function of computing text extents
Thinker K.F. Li <thinker@branda.to>
parents: 396
diff changeset
315 matrix[2] = shift_x;
55f38c2cdb8f Refactor function of computing text extents
Thinker K.F. Li <thinker@branda.to>
parents: 396
diff changeset
316 matrix[3] = 0;
55f38c2cdb8f Refactor function of computing text extents
Thinker K.F. Li <thinker@branda.to>
parents: 396
diff changeset
317 matrix[4] = font_sz;
55f38c2cdb8f Refactor function of computing text extents
Thinker K.F. Li <thinker@branda.to>
parents: 396
diff changeset
318 matrix[5] += shift_y;
55f38c2cdb8f Refactor function of computing text extents
Thinker K.F. Li <thinker@branda.to>
parents: 396
diff changeset
319 matrix_mul(aggr, matrix, scaled_matrix);
55f38c2cdb8f Refactor function of computing text extents
Thinker K.F. Li <thinker@branda.to>
parents: 396
diff changeset
320
55f38c2cdb8f Refactor function of computing text extents
Thinker K.F. Li <thinker@branda.to>
parents: 396
diff changeset
321 scaled = make_scaled_font_face_matrix(face, scaled_matrix);
393
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
322
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Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
323 return scaled;
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Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
324 }
27774b93521e Add sh_stext_t to implement a simple version of text shape.
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parents:
diff changeset
325
403
aee0f66b1154 Compute extents of a styled text
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parents: 397
diff changeset
326 /*! \brief Extend an extents from another sub-extents.
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parents: 397
diff changeset
327 *
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parents: 397
diff changeset
328 * A styled text is styled by several styled blocks, so extents of
aee0f66b1154 Compute extents of a styled text
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parents: 397
diff changeset
329 * blocks should be computed separated, collected, and aggreagated
aee0f66b1154 Compute extents of a styled text
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parents: 397
diff changeset
330 * into a full extents.
aee0f66b1154 Compute extents of a styled text
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parents: 397
diff changeset
331 */
393
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
332 static
403
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parents: 397
diff changeset
333 void extent_extents(mb_text_extents_t *full, mb_text_extents_t *sub) {
407
92a459a1c5aa more comment
Thinker K.F. Li <thinker@branda.to>
parents: 403
diff changeset
334 co_aix f_rbx, f_rby; /* rb stands for right button */
403
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Thinker K.F. Li <thinker@branda.to>
parents: 397
diff changeset
335 co_aix s_rbx, s_rby;
aee0f66b1154 Compute extents of a styled text
Thinker K.F. Li <thinker@branda.to>
parents: 397
diff changeset
336
aee0f66b1154 Compute extents of a styled text
Thinker K.F. Li <thinker@branda.to>
parents: 397
diff changeset
337 f_rbx = MBE_GET_X_BEARING(full) + MBE_GET_WIDTH(full);
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parents: 397
diff changeset
338 f_rby = MBE_GET_Y_BEARING(full) + MBE_GET_HEIGHT(full);
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Thinker K.F. Li <thinker@branda.to>
parents: 397
diff changeset
339 s_rbx = MBE_GET_X_BEARING(sub) + MBE_GET_WIDTH(sub);
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parents: 397
diff changeset
340 s_rby = MBE_GET_Y_BEARING(sub) + MBE_GET_HEIGHT(sub);
aee0f66b1154 Compute extents of a styled text
Thinker K.F. Li <thinker@branda.to>
parents: 397
diff changeset
341
aee0f66b1154 Compute extents of a styled text
Thinker K.F. Li <thinker@branda.to>
parents: 397
diff changeset
342 /* set bearing */
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Thinker K.F. Li <thinker@branda.to>
parents: 397
diff changeset
343 if(MBE_GET_X_BEARING(full) > MBE_GET_X_BEARING(sub))
aee0f66b1154 Compute extents of a styled text
Thinker K.F. Li <thinker@branda.to>
parents: 397
diff changeset
344 MBE_SET_X_BEARING(full, MBE_GET_X_BEARING(sub));
aee0f66b1154 Compute extents of a styled text
Thinker K.F. Li <thinker@branda.to>
parents: 397
diff changeset
345 if(MBE_GET_Y_BEARING(full) > MBE_GET_Y_BEARING(sub))
aee0f66b1154 Compute extents of a styled text
Thinker K.F. Li <thinker@branda.to>
parents: 397
diff changeset
346 MBE_SET_Y_BEARING(full, MBE_GET_Y_BEARING(sub));
aee0f66b1154 Compute extents of a styled text
Thinker K.F. Li <thinker@branda.to>
parents: 397
diff changeset
347
aee0f66b1154 Compute extents of a styled text
Thinker K.F. Li <thinker@branda.to>
parents: 397
diff changeset
348 /* set width/height */
aee0f66b1154 Compute extents of a styled text
Thinker K.F. Li <thinker@branda.to>
parents: 397
diff changeset
349 if(f_rbx < s_rbx)
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Thinker K.F. Li <thinker@branda.to>
parents: 397
diff changeset
350 MBE_SET_WIDTH(full, s_rbx - MBE_GET_X_BEARING(full));
aee0f66b1154 Compute extents of a styled text
Thinker K.F. Li <thinker@branda.to>
parents: 397
diff changeset
351 if(f_rby < s_rby)
aee0f66b1154 Compute extents of a styled text
Thinker K.F. Li <thinker@branda.to>
parents: 397
diff changeset
352 MBE_SET_HEIGHT(full, s_rby - MBE_GET_Y_BEARING(full));
aee0f66b1154 Compute extents of a styled text
Thinker K.F. Li <thinker@branda.to>
parents: 397
diff changeset
353 }
aee0f66b1154 Compute extents of a styled text
Thinker K.F. Li <thinker@branda.to>
parents: 397
diff changeset
354
aee0f66b1154 Compute extents of a styled text
Thinker K.F. Li <thinker@branda.to>
parents: 397
diff changeset
355 /*! \brief Compute extents of a stext object according style blocks.
aee0f66b1154 Compute extents of a styled text
Thinker K.F. Li <thinker@branda.to>
parents: 397
diff changeset
356 *
aee0f66b1154 Compute extents of a styled text
Thinker K.F. Li <thinker@branda.to>
parents: 397
diff changeset
357 * It create scaled fonts for style blocks, compute their extents,
aee0f66b1154 Compute extents of a styled text
Thinker K.F. Li <thinker@branda.to>
parents: 397
diff changeset
358 * and compute where they should be draw acoording advance of style
aee0f66b1154 Compute extents of a styled text
Thinker K.F. Li <thinker@branda.to>
parents: 397
diff changeset
359 * blocks before a style block.
aee0f66b1154 Compute extents of a styled text
Thinker K.F. Li <thinker@branda.to>
parents: 397
diff changeset
360 */
aee0f66b1154 Compute extents of a styled text
Thinker K.F. Li <thinker@branda.to>
parents: 397
diff changeset
361 static
aee0f66b1154 Compute extents of a styled text
Thinker K.F. Li <thinker@branda.to>
parents: 397
diff changeset
362 void compute_styled_extents_n_scaled_font(sh_stext_t *txt_o) {
aee0f66b1154 Compute extents of a styled text
Thinker K.F. Li <thinker@branda.to>
parents: 397
diff changeset
363 mb_text_extents_t sub_extents;
aee0f66b1154 Compute extents of a styled text
Thinker K.F. Li <thinker@branda.to>
parents: 397
diff changeset
364 mb_text_extents_t *extents;
393
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
365 mb_style_blk_t *blk;
397
55f38c2cdb8f Refactor function of computing text extents
Thinker K.F. Li <thinker@branda.to>
parents: 396
diff changeset
366 int blk_txt_len;
55f38c2cdb8f Refactor function of computing text extents
Thinker K.F. Li <thinker@branda.to>
parents: 396
diff changeset
367 mb_scaled_font_t *scaled_font;
55f38c2cdb8f Refactor function of computing text extents
Thinker K.F. Li <thinker@branda.to>
parents: 396
diff changeset
368 char *txt, saved;
393
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
369 co_aix shift_x, shift_y;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
370 int i;
397
55f38c2cdb8f Refactor function of computing text extents
Thinker K.F. Li <thinker@branda.to>
parents: 396
diff changeset
371
55f38c2cdb8f Refactor function of computing text extents
Thinker K.F. Li <thinker@branda.to>
parents: 396
diff changeset
372 memset(&full_extents, sizeof(mb_text_extents_t), 0);
55f38c2cdb8f Refactor function of computing text extents
Thinker K.F. Li <thinker@branda.to>
parents: 396
diff changeset
373
393
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
374 blk = txt_o->style_blks;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
375 scaled_font = txt_o->scaled_fonts;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
376 txt = (char *)txt_o->txt;
403
aee0f66b1154 Compute extents of a styled text
Thinker K.F. Li <thinker@branda.to>
parents: 397
diff changeset
377 extents = &txt_o->extents;
393
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
378 for(i = 0; i < txt_o->nblks; i++) {
397
55f38c2cdb8f Refactor function of computing text extents
Thinker K.F. Li <thinker@branda.to>
parents: 396
diff changeset
379 shift_x = txt_o->x + full_extents.x_adv;
55f38c2cdb8f Refactor function of computing text extents
Thinker K.F. Li <thinker@branda.to>
parents: 396
diff changeset
380 shift_y = txt_o->y + full_extents.y_adv;
55f38c2cdb8f Refactor function of computing text extents
Thinker K.F. Li <thinker@branda.to>
parents: 396
diff changeset
381
55f38c2cdb8f Refactor function of computing text extents
Thinker K.F. Li <thinker@branda.to>
parents: 396
diff changeset
382 *scaled_font = make_scaled_font_face(txt_o, blk->face,
55f38c2cdb8f Refactor function of computing text extents
Thinker K.F. Li <thinker@branda.to>
parents: 396
diff changeset
383 shift_x, shift_y, font_sz);
393
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
384 ASSERT(*scaled_font != NULL);
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
385
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
386 blk_txt_len = compute_utf8_chars_sz(txt, blk->n_chars);
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
387 ASSERT(blk_txt_len != ERR);
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
388
397
55f38c2cdb8f Refactor function of computing text extents
Thinker K.F. Li <thinker@branda.to>
parents: 396
diff changeset
389 saved = txt[blk_txt_len];
55f38c2cdb8f Refactor function of computing text extents
Thinker K.F. Li <thinker@branda.to>
parents: 396
diff changeset
390 txt[blk_txt_len] = 0;
403
aee0f66b1154 Compute extents of a styled text
Thinker K.F. Li <thinker@branda.to>
parents: 397
diff changeset
391 compute_text_extents(*scaled_font, txt, extents);
397
55f38c2cdb8f Refactor function of computing text extents
Thinker K.F. Li <thinker@branda.to>
parents: 396
diff changeset
392 txt[blk_txt_len] = saved;
55f38c2cdb8f Refactor function of computing text extents
Thinker K.F. Li <thinker@branda.to>
parents: 396
diff changeset
393
403
aee0f66b1154 Compute extents of a styled text
Thinker K.F. Li <thinker@branda.to>
parents: 397
diff changeset
394 extent_extents(&txt_o->full_extents, extents);
aee0f66b1154 Compute extents of a styled text
Thinker K.F. Li <thinker@branda.to>
parents: 397
diff changeset
395
393
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
396 scaled_font++;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
397 blk++;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
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398 txt += blk_txt_len;
403
aee0f66b1154 Compute extents of a styled text
Thinker K.F. Li <thinker@branda.to>
parents: 397
diff changeset
399 extents = &sub_extents;
393
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
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400 }
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
401 }
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
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402
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
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403 /*
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
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404 * What we have to do in sh_stext_transform() is
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
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405 * - computing bounding box for the text,
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
406 * - computing offset x,y for the text of style blocks,
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
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407 * - free old scaled fonts, and
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
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408 * - making scaled fonts for style blocks.
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
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409 */
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
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410 void sh_stext_transform(shape_t *shape) {
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
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411 sh_stext_t *txt_o = (sh_stext_t *)shape;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
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412
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
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413 ASSERT(txt_o != NULL);
403
aee0f66b1154 Compute extents of a styled text
Thinker K.F. Li <thinker@branda.to>
parents: 397
diff changeset
414 compute_styled_extents_n_scaled_font(txt_o);
393
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
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415 }
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
416
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
417 void sh_stext_draw(shape_t *shape, cairo_t *cr) {
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
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418 sh_stext_t *txt_o = (sh_stext_t *)shape;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
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419
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
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420 ASSERT(txt_o != NULL);
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
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421 }
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
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422
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
423 int sh_stext_set_text(shape_t *shape, const char *txt) {
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
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424 sh_stext_t *txt_o = (sh_stext_t *)shape;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
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425 char *new_txt;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
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426 int sz;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
427
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
428 ASSERT(txt_o != NULL);
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
429 ASSERT(txt != NULL);
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
430
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
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431 sz = strlen(txt) + 1;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
432 new_txt = realloc(txt_o->txt, sz);
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
433 if(new_txt == NULL)
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
434 return ERR;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
435
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
436 memcpy(new_txt, txt, sz);
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
437 txt_o->txt = new_txt;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
438
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
439 return OK;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
440 }
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
441
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
442 int sh_stext_set_style(shape_t *shape,
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
443 const mb_style_blk_t *blks,
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
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444 int nblks) {
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
445 sh_stext_t *txt_o = (sh_stext_t *)shape;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
446 mb_style_blk_t *new_blks;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
447 co_aix *new_exts;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
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448 int sz;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
449
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
450 ASSERT(txt_o != NULL);
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
451 ASSERT(nblks >= 0);
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
452
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
453 if(nblks > txt_o->max_nblks) {
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
454 sz = nblks * (sizeof(mb_style_blk_t) + sizeof(int));
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
455 new_blks = (mb_style_blk_t *)realloc(txt_o->style_blks, sz);
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
456 if(new_blks == NULL)
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
457 return ERR;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
458 new_exts = (int *)(new_blks + nblks);
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
459
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
460 txt_o->style_blks = new_blks;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
461 txt_o->exts = new_exts;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
462 txt_o->max_nblks = nblks;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
463 }
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
464
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
465 memcpy(txt_o->blks, blks, nblks * sizeof(mb_style_blk_t));
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
466 txt_o->nblks = nblks;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
467
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
468 return OK;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
469 }
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
470
396
7fe0b1ee92b6 Add extents supporting into Fontconfig and FreeType Layer
Thinker K.F. Li <thinker@branda.to>
parents: 395
diff changeset
471 #endif /* SHAPE_STEXT */