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annotate src/shape_stext.c @ 396:7fe0b1ee92b6

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Add extents supporting into Fontconfig and FreeType Layer
author Thinker K.F. Li <thinker@branda.to>
date Wed, 10 Jun 2009 22:46:13 +0800
parents d30b575a4ad4
children 55f38c2cdb8f
rev   line source
396
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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 /*! \defgroup fontconfig_freetype Fontconfig and FreeType Layer.
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16 *
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17 * This layer implements a font provider to reset of the system.
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18 * It bases on fontconfig and FreeType supporting of Cairo.
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19 *
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20 * @{
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21 */
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22 /*! \brief Stakeholder of scaled font.
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23 *
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24 * It is actually a cairo_scaled_font_t, now. But, it should not be
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25 * noticed by out-siders. Only \ref fontconfig_freetype
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26 * should known it.
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27 */
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28 typedef struct _mb_scaled_font mb_scaled_font_t;
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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 * Although, mb_text_extents_t is defined as a cairo_scaled_font_t, but
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33 * programmers should assume it is opague.
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34 */
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35 typedef cairo_text_extents_t mb_text_extents_t;
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36
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37 #define MBE_GET_X_ADV(ext) ((ext)->x_advance)
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38 #define MBE_GET_Y_ADV(ext) ((ext)->y_advance)
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39 #define MBE_GET_WIDTH(ext) ((ext)->width)
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40 #define MBE_GET_HEIGHT(ext) ((ext)->height)
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41
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42 /*! \brief Find out a font pattern.
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43 *
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44 * This function use fontconfig to decide a font file in pattern. It can
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45 * replaced by other mechanism if you think it is not what you want.
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46 */
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47 static
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48 FcPattern *query_font_pattern(const char *family, int slant, int weight) {
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49 FcPattern *ptn, *p;
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50 FcValue val;
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51 FcConfig *cfg;
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52 FcBool r;
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53 static int slant_map[] = { /* from MB_FONT_SLANT_* to FC_SLANT_* */
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54 FC_SLANT_ROMAN,
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55 FC_SLANT_ROMAN,
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56 FC_SLANT_ITALIC,
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57 FC_SLANT_OBLIQUE};
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58
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59 cfg = FcConfigGetCurrent();
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60 ptn = FcPatternCreate();
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61 p = FcPatternCreate();
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62 if(ptn == NULL || p == NULL)
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63 goto err;
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64
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65 val.type = FcTypeString;
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66 val.u.s = family;
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67 FcPatternAdd(ptn, "family", &val, FcTrue);
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68
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69 val.type = FcTypeInteger;
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70 val.u.i = slant_map[slant];
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71 FcPatternAdd(ptn, "slant", &val, FcTrue);
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72
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73 val.type = FcTypeInteger;
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74 val.u.i = weight;
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75 FcPatternAdd(ptn, "weight", &val, FcTrue);
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76
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77 r = FcConfigSubstituteWithPat(cfg, ptn, NULL, FcMatchPattern);
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78 if(!r)
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79 goto err;
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80
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81 r = FcConfigSubstituteWithPat(cfg, p, ptn, FcMatchFont);
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82 if(!r)
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83 goto err;
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84
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85 FcDefaultSubstitute(p);
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86
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87 FcPatternDestroy(ptn);
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88
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89 return p;
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90
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91 err:
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92 if(ptn)
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93 FcPatternDestroy(ptn);
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94 if(p)
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95 FcPatternDestroy(p);
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96 return NULL;
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97
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98 }
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99
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100 /*! \brief Find out a font face for a pattern specified.
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101 *
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102 * The pattern, here, is a vector of family, slant, and weight.
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103 * This function base on fontconfig and cairo FreeType font supporting.
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104 * You can replace this function with other font mechanisms.
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105 */
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106 static
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107 mb_font_face_t *query_font_face(const char *family, int slant, int weight) {
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108 cairo_font_face_t *cface;
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109 FcPattern *ptn;
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110
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111 ptn = query_font_pattern(family, slant, weight);
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112 cface = cairo_ft_font_face_create_for_pattern(ptn);
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113 FcPatternDestroy(ptn);
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114
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115 return (mb_font_face_t *)cface;
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116 }
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117
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118 static
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119 void free_font_face(mb_font_face_t *face) {
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120 ASSERT(face == NULL);
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121
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122 cairo_font_face_destroy((cairo_font_face_t *)face);
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123 }
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124
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125 /*! \brief This is scaled font for specified size and extent.
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126 *
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127 * Font face only specified which font would be used to draw text
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128 * message. But, it also need to scale glyphs to specified size and
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129 * rotation. This function return a scaled font specified by a
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130 * matrix that transform glyph from design space of the font to
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131 * user space of cairo surface.
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132 */
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133 static
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134 mb_scaled_font_t *get_cairo_scaled_font(mb_font_face_t *face,
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135 co_aix *matrix) {
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136 cairo_font_face_t *scaled_font;
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137 cairo_matrix_t font_matrix;
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138 static cairo_matir_t id = {
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139 1, 0,
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140 0, 1,
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141 0, 0
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142 };
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143 static cairo_font_options_t *opt = NULL;
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144
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145 ASSERT(matrix != NULL);
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146
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147 if(opt == NULL) {
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148 opt = cairo_font_options_create();
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149 if(opt == NULL)
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150 return NULL;
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151 }
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152
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153 font_matrix.xx = *matrix++;
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154 font_matrix.xy = *matrix++;
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155 font_matrix.x0 = *matrix++;
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156 font_matrix.yx = *matrix++;
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157 font_matrix.yy = *matrix++;
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158 font_matrix.y0 = *matrix;
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159 scaled_font = cairo_scaled_font_create((cairo_font_face_t *)face,
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160 &font_matrix,
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161 &id, opt);
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162
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163 return (mb_scaled_font_t *)scaled_font;
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164 }
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165
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166 static
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167 void free_scaled_font(mb_scaled_font_t *scaled_font) {
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168 cairo_scaled_font_destroy((cairo_scaled_font_t *)scaled_font);
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169 }
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170
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171 static
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172 void text_extents(mb_scaled_font_t *scaled_font, const char *txt,
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173 mb_text_extents_t *extents) {
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174 cairo_scaled_font_text_extents((cairo_scaled_font_t *)scaled_font,
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175 txt,
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176 (cairo_text_extents_t *)extents);
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177 }
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178
396
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179 static
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180 mb_text_extents_t *mb_text_extents_new(void) {
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181 cairo_text_extents_t *extents;
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182
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183 extents = (cairo_text_extents_t *)malloc(sizeof(cairo_text_extents_t));
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184 return extents;
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185 }
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186
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187 static
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188 void mb_text_extents_free(mb_text_extents_t *extents) {
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189 free(extents);
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190 }
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191
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192 /* @} */
395
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193
393
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194 /*! \brief Query and return a font face for a specified attribute vector.
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195 *
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196 * Programmers use mb_font_face_t to specify fonts used to show a
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197 * block of text on the output device. They can get mb_font_face_t with
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198 * this function. The objects return by mb_font_face_query() should be
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199 * freed with mb_font_face_free() when they are not more used.
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200 *
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201 * \param family is the name of a font family (times).
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202 * \param slant is one of \ref MB_FONT_SLANTS.
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203 * \param weight decides if a font is thin or heavy.
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204 */
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205 mb_font_face_t *mb_font_face_query(redraw_man_t *rdman,
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206 const char *family,
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207 int slant,
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208 int weight) {
396
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209 return query_font_face(family, slant, weight);
393
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210 }
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211
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212 void mb_font_face_free(mb_font_face_t *face) {
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213 ASSERT(face != NULL);
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214 free_font_face(face);
393
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215 }
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216
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217 /*! \brief A simple implementation of text shape.
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218 *
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219 */
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220 typedef struct _sh_stext {
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221 shape_t shape;
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222 const char *txt; /*!< \brief Text to be showed */
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223 const mb_style_blk_t *style_blks; /*!< \brief Style of text */
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224 int nblks; /*!< \brief Number of style blocks */
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225 int max_nblks;
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226 co_aix x, y;
396
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227 mb_scaled_font_t **scaled_fonts;
393
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228 } sh_stext_t;
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229
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230 shape_t *rdman_shape_stext_new(redraw_man_t *rdman, co_aix x, co_aix y,
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231 const char *txt) {
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232 sh_stext_t *txt_o;
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233
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234 ASSERT(txt != NULL);
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235
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236 txt_o = (sh_stext_t *)malloc(sizeof(sh_stext_t));
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237 if(txt_o == NULL)
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238 return NULL;
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239
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240 memset(&txt_o->shape, 0, sizeof(shape_t));
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241 mb_obj_init(txt_o, MBO_STEXT);
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242
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243 txt_o->txt = strdup(txt);
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244 txt_o->style_blks = NULL;
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245 txt_o->nblks = 0;
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246 txt_o->max_nblks = 0;
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247 txt_o->x = x;
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248 txt_o->y = y;
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249 txt_o->exts = NULL;
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250
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251 if(txt_o->txt == NULL) {
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252 free(txt_o);
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253 txt_o = NULL;
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254 }
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255
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256 return (shape_t *)txt_o;
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257 }
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258
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259 static
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260 int compute_utf8_chars_sz(const char *txt, int n_chars) {
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261 int i;
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262 const char *p = txt;
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263
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264 for(i = 0; i < n && *p; i++) {
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265 if(*p++ & 0x80)
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266 continue; /* single byte */
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
267 /* multi-bytes */
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
268 while(*p && ((*p & 0xc0) == 0x80))
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
269 p++;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
270 }
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
271 if(i < n)
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
272 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
273
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
274 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
275 }
27774b93521e Add sh_stext_t to implement a simple version of text shape.
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 static
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
278 void compute_text_extents(char *txt, int txt_len,
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
279 cairo_scaled_font_t *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
280 cairo_text_extents_t *extents) {
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
281 char saved;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
282
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
283 saved = txt[txt_len];
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
284 txt[txt_len] = 0;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
285 cairo_scaled_font_text_extents(scaled_font, txt, extents);
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
286 txt[txt_len] = saved;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
287 }
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
288
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
289 static
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
290 cairo_scaled_font_t *make_scaled_font_face(sh_stext_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
291 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
292 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
293 co_aix font_sz) {
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
294 cairo_matrix_t cmtx;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
295 static cairo_matrix_t cid;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
296 static cairo_font_options_t *fopt = NULL;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
297 co_aix *matrix;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
298 cairo_scaled_font_t *scaled;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
299 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
300
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
301 if(fopt == NULL) {
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
302 cairo_matrix_init_identify(&cid);
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
303 fopt = cairo_font_options_create();
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
304 if(fopt == NULL)
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
305 return NULL;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
306 }
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
307
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
308 matrix = sh_get_aggr_matrix((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
309 i = 0;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
310 cmtx.xx = matrix[i++];
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
311 cmtx.xy = matrix[i++];
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
312 cmtx.x0 = matrix[i++] + shift_x;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
313 cmtx.yx = matrix[i++];
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
314 cmtx.yy = matrix[i++];
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
315 cmtx.y0 = matrix[i] + 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
316
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
317 scaled = cairo_scaled_font_create(face, &cmtx, &cid, fopt);
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
318
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
319 return scaled;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
320 }
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
321
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
322 static
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
323 void compute_extents(sh_stext_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
324 co_aix adv_x, adv_y;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
325 cairo_text_extents_t extents;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
326 mb_style_blk_t *blk;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
327 cairo_scaled_font_t *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
328 char *txt;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
329 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
330 int blk_txt_len;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
331 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
332
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
333 adv_x = adv_y = 0;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
334 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
335 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
336 txt = (char *)txt_o->txt;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
337 shift_x = txt_o->x;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
338 shift_y = txt_o->y;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
339 for(i = 0; i < txt_o->nblks; i++) {
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
340 *scaled_font = make_scaled_fonts(txt_o, blk->face,
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
341 shift_x, shift_y, font_sz);
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
342 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
343
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
344 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
345 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
346
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
347 compute_text_extents(txt, blk_txt_len, *scaled_font, &extents);
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
348 adv_x += extents.x_advance;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
349 adv_y += extents.y_advance;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
350
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
351 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
352 blk++;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
353 txt += blk_txt_len;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
354 }
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
355 }
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
356
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
357 /*
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
358 * 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:
diff changeset
359 * - 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
360 * - 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:
diff changeset
361 * - 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:
diff changeset
362 * - 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:
diff changeset
363 */
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
364 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:
diff changeset
365 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
366
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
367 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
368 }
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
369
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
370 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:
diff changeset
371 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
372
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
373 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
374 }
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
375
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
376 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:
diff changeset
377 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
378 char *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
379 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
380
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
381 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
382 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
383
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
384 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
385 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
386 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
387 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
388
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
389 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
390 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
391
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
392 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
393 }
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
394
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
395 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>
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396 const mb_style_blk_t *blks,
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397 int nblks) {
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398 sh_stext_t *txt_o = (sh_stext_t *)shape;
27774b93521e Add sh_stext_t to implement a simple version of text shape.
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399 mb_style_blk_t *new_blks;
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400 co_aix *new_exts;
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401 int sz;
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402
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Thinker K.F. Li <thinker@branda.to>
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403 ASSERT(txt_o != NULL);
27774b93521e Add sh_stext_t to implement a simple version of text shape.
Thinker K.F. Li <thinker@branda.to>
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404 ASSERT(nblks >= 0);
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Thinker K.F. Li <thinker@branda.to>
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405
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Thinker K.F. Li <thinker@branda.to>
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406 if(nblks > txt_o->max_nblks) {
27774b93521e Add sh_stext_t to implement a simple version of text shape.
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407 sz = nblks * (sizeof(mb_style_blk_t) + sizeof(int));
27774b93521e Add sh_stext_t to implement a simple version of text shape.
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408 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.
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409 if(new_blks == NULL)
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Thinker K.F. Li <thinker@branda.to>
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410 return ERR;
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411 new_exts = (int *)(new_blks + nblks);
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412
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413 txt_o->style_blks = new_blks;
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414 txt_o->exts = new_exts;
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415 txt_o->max_nblks = nblks;
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Thinker K.F. Li <thinker@branda.to>
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416 }
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417
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Thinker K.F. Li <thinker@branda.to>
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418 memcpy(txt_o->blks, blks, nblks * sizeof(mb_style_blk_t));
27774b93521e Add sh_stext_t to implement a simple version of text shape.
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419 txt_o->nblks = nblks;
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420
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421 return OK;
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422 }
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423
396
7fe0b1ee92b6 Add extents supporting into Fontconfig and FreeType Layer
Thinker K.F. Li <thinker@branda.to>
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424 #endif /* SHAPE_STEXT */