1 | /*
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2 | * Copyright (c) 2020 Jiri Svoboda
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3 | * All rights reserved.
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4 | *
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5 | * Redistribution and use in source and binary forms, with or without
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6 | * modification, are permitted provided that the following conditions
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7 | * are met:
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8 | *
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9 | * - Redistributions of source code must retain the above copyright
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10 | * notice, this list of conditions and the following disclaimer.
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11 | * - Redistributions in binary form must reproduce the above copyright
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12 | * notice, this list of conditions and the following disclaimer in the
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13 | * documentation and/or other materials provided with the distribution.
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14 | * - The name of the author may not be used to endorse or promote products
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15 | * derived from this software without specific prior written permission.
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16 | *
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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27 | */
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28 |
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29 | /** @addtogroup libgfxfont
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30 | * @{
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31 | */
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32 | /**
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33 | * @file Glyph bitmap
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34 | */
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35 |
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36 | #include <errno.h>
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37 | #include <gfx/bitmap.h>
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38 | #include <gfx/coord.h>
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39 | #include <gfx/glyph_bmp.h>
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40 | #include <io/pixelmap.h>
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41 | #include <stdlib.h>
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42 | #include "../private/font.h"
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43 | #include "../private/glyph.h"
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44 | #include "../private/glyph_bmp.h"
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45 |
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46 | static errno_t gfx_glyph_bmp_extend(gfx_glyph_bmp_t *, gfx_coord2_t *);
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47 |
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48 | /** Open glyph bitmap for editing.
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49 | *
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50 | * @param glyph Glyph
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51 | * @param rbmp Place to store glyph bitmap
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52 | * @return EOK on success, ENOMEM if out of memory
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53 | */
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54 | errno_t gfx_glyph_bmp_open(gfx_glyph_t *glyph, gfx_glyph_bmp_t **rbmp)
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55 | {
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56 | gfx_font_t *font = glyph->font;
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57 | gfx_glyph_bmp_t *bmp;
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58 | pixelmap_t pmap;
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59 | gfx_bitmap_alloc_t alloc;
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60 | gfx_coord_t x, y;
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61 | pixel_t pixel;
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62 | errno_t rc;
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63 |
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64 | bmp = calloc(1, sizeof(gfx_glyph_bmp_t));
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65 | if (bmp == NULL)
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66 | return ENOMEM;
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67 |
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68 | /* Bitmap coordinates are relative to glyph origin point */
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69 | gfx_rect_rtranslate(&glyph->origin, &glyph->rect, &bmp->rect);
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70 |
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71 | bmp->pixels = calloc((bmp->rect.p1.x - bmp->rect.p0.x) *
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72 | (bmp->rect.p1.y - bmp->rect.p0.y), sizeof(int));
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73 | if (bmp->pixels == NULL) {
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74 | free(bmp);
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75 | return ENOMEM;
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76 | }
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77 |
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78 | rc = gfx_bitmap_get_alloc(font->bitmap, &alloc);
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79 | if (rc != EOK) {
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80 | free(bmp->pixels);
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81 | free(bmp);
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82 | return rc;
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83 | }
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84 |
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85 | assert(font->rect.p0.x == 0);
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86 | assert(font->rect.p0.y == 0);
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87 | pmap.width = font->rect.p1.x;
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88 | pmap.height = font->rect.p1.y;
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89 | pmap.data = alloc.pixels;
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90 |
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91 | /* Copy pixels from font bitmap */
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92 |
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93 | for (y = bmp->rect.p0.y; y < bmp->rect.p1.y; y++) {
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94 | for (x = bmp->rect.p0.x; x < bmp->rect.p1.x; x++) {
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95 | pixel = pixelmap_get_pixel(&pmap, glyph->origin.x + x,
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96 | glyph->origin.y + y);
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97 | bmp->pixels[(y - bmp->rect.p0.y) *
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98 | (bmp->rect.p1.x - bmp->rect.p0.x) +
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99 | (x - bmp->rect.p0.x)] = (pixel != 0) ? 1 : 0;
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100 | }
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101 | }
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102 |
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103 | bmp->glyph = glyph;
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104 | *rbmp = bmp;
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105 | return EOK;
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106 | }
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107 |
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108 | /** Save glyph bitmap.
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109 | *
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110 | * @param bmp Glyph bitmap
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111 | * @return EOK on success, ENOMEM if out of memory
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112 | */
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113 | errno_t gfx_glyph_bmp_save(gfx_glyph_bmp_t *bmp)
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114 | {
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115 | gfx_glyph_t *glyph = bmp->glyph;
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116 | gfx_font_t *font = glyph->font;
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117 | gfx_coord_t x, y;
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118 | gfx_rect_t used_rect;
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119 | pixel_t pixel;
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120 | pixelmap_t pmap;
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121 | gfx_bitmap_alloc_t alloc;
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122 | errno_t rc;
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123 |
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124 | /* Find actual rectangle being used */
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125 | gfx_glyph_bmp_find_used_rect(bmp, &used_rect);
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126 |
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127 | /*
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128 | * Replace glyph with empty space in the font bitmap, the width
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129 | * of the empty equal to new glyph bitmap width. The glyph width
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130 | * is adjusted.
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131 | */
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132 | rc = gfx_font_splice_at_glyph(font, glyph, &used_rect);
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133 | if (rc != EOK)
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134 | return rc;
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135 |
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136 | rc = gfx_bitmap_get_alloc(font->bitmap, &alloc);
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137 | if (rc != EOK)
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138 | return rc;
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139 |
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140 | assert(font->rect.p0.x == 0);
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141 | assert(font->rect.p0.y == 0);
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142 | pmap.width = font->rect.p1.x;
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143 | pmap.height = font->rect.p1.y;
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144 | pmap.data = alloc.pixels;
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145 |
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146 | /* Copy pixels to font bitmap */
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147 |
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148 | for (y = used_rect.p0.y; y < used_rect.p1.y; y++) {
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149 | for (x = used_rect.p0.x; x < used_rect.p1.x; x++) {
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150 | pixel = bmp->pixels[(y - bmp->rect.p0.y) *
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151 | (bmp->rect.p1.x - bmp->rect.p0.x) +
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152 | (x - bmp->rect.p0.x)] ?
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153 | PIXEL(255, 255, 255, 255) : PIXEL(0, 0, 0, 0);
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154 | pixelmap_put_pixel(&pmap, glyph->origin.x + x,
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155 | glyph->origin.y + y, pixel);
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156 | }
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157 | }
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158 |
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159 | return EOK;
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160 | }
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161 |
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162 | /** Close glyph bitmap.
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163 | *
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164 | * @param bmp Glyph bitmap
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165 | */
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166 | void gfx_glyph_bmp_close(gfx_glyph_bmp_t *bmp)
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167 | {
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168 | free(bmp->pixels);
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169 | free(bmp);
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170 | }
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171 |
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172 | /** Get rectangle covered by glyph bitmap.
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173 | *
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174 | * @param bmp Glyph bitmap
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175 | * @param rect Place to store rectangle
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176 | */
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177 | void gfx_glyph_bmp_get_rect(gfx_glyph_bmp_t *bmp, gfx_rect_t *rect)
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178 | {
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179 | *rect = bmp->rect;
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180 | }
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181 |
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182 | /** Find minimum rectangle covering all non-background pixels.
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183 | *
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184 | * @param bmp Glyph bitmap
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185 | * @param rect Place to store rectangle
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186 | */
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187 | void gfx_glyph_bmp_find_used_rect(gfx_glyph_bmp_t *bmp, gfx_rect_t *rect)
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188 | {
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189 | gfx_coord_t x, y;
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190 | gfx_coord2_t min;
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191 | gfx_coord2_t max;
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192 | bool anypix;
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193 | int pix;
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194 |
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195 | min.x = bmp->rect.p1.x;
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196 | min.y = bmp->rect.p1.y;
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197 | max.x = bmp->rect.p0.x;
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198 | max.y = bmp->rect.p0.y;
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199 |
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200 | anypix = false;
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201 | for (y = bmp->rect.p0.y; y < bmp->rect.p1.y; y++) {
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202 | for (x = bmp->rect.p0.x; x < bmp->rect.p1.x; x++) {
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203 | pix = gfx_glyph_bmp_getpix(bmp, x, y);
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204 | if (pix != 0) {
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205 | anypix = true;
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206 | if (x < min.x)
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207 | min.x = x;
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208 | if (y < min.y)
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209 | min.y = y;
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210 | if (x > max.x)
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211 | max.x = x;
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212 | if (y > max.y)
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213 | max.y = y;
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214 | }
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215 | }
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216 | }
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217 |
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218 | if (anypix) {
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219 | rect->p0.x = min.x;
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220 | rect->p0.y = min.y;
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221 | rect->p1.x = max.x + 1;
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222 | rect->p1.y = max.y + 1;
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223 | } else {
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224 | rect->p0.x = 0;
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225 | rect->p0.y = 0;
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226 | rect->p1.x = 0;
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227 | rect->p1.y = 0;
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228 | }
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229 | }
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230 |
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231 | /** Get pixel from glyph bitmap.
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232 | *
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233 | * @param bmp Glyph bitmap
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234 | * @param x X-coordinate
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235 | * @param y Y-coordinate
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236 | * @return Pixel value
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237 | */
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238 | int gfx_glyph_bmp_getpix(gfx_glyph_bmp_t *bmp, gfx_coord_t x, gfx_coord_t y)
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239 | {
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240 | gfx_coord2_t pos;
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241 | size_t pitch;
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242 |
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243 | pos.x = x;
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244 | pos.y = y;
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245 | if (!gfx_pix_inside_rect(&pos, &bmp->rect))
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246 | return 0;
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247 |
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248 | pitch = bmp->rect.p1.x - bmp->rect.p0.x;
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249 |
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250 | return bmp->pixels[(y - bmp->rect.p0.y) * pitch +
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251 | (x - bmp->rect.p0.x)];
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252 | }
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253 |
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254 | /** Set pixel in glyph bitmap.
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255 | *
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256 | * @param bmp Glyph bitmap
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257 | * @param x X-coordinate
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258 | * @param y Y-coordinate
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259 | *
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260 | * @reutrn EOK on success, ENOMEM if out of memory
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261 | */
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262 | errno_t gfx_glyph_bmp_setpix(gfx_glyph_bmp_t *bmp, gfx_coord_t x,
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263 | gfx_coord_t y, int value)
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264 | {
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265 | gfx_coord2_t pos;
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266 | size_t pitch;
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267 | errno_t rc;
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268 |
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269 | pos.x = x;
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270 | pos.y = y;
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271 |
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272 | if (!gfx_pix_inside_rect(&pos, &bmp->rect)) {
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273 | rc = gfx_glyph_bmp_extend(bmp, &pos);
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274 | if (rc != EOK)
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275 | return rc;
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276 | }
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277 |
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278 | pitch = bmp->rect.p1.x - bmp->rect.p0.x;
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279 | bmp->pixels[(y - bmp->rect.p0.y) * pitch +
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280 | (x - bmp->rect.p0.x)] = value;
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281 | return EOK;
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282 | }
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283 |
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284 | /** Clear glyph bitmap
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285 | *
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286 | * @param bmp Glyph bitmap
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287 | *
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288 | * @return EOK on sucesss, ENOMEM if out of memory
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289 | */
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290 | errno_t gfx_glyph_bmp_clear(gfx_glyph_bmp_t *bmp)
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291 | {
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292 | int *npixels;
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293 |
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294 | /* Allocate new pixel array */
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295 | npixels = calloc(1, sizeof(int));
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296 | if (npixels == NULL)
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297 | return ENOMEM;
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298 |
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299 | /* Switch new and old data */
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300 | free(bmp->pixels);
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301 | bmp->pixels = npixels;
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302 | bmp->rect.p0.x = 0;
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303 | bmp->rect.p0.y = 0;
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304 | bmp->rect.p1.x = 0;
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305 | bmp->rect.p1.y = 0;
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306 |
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307 | return EOK;
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308 | }
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309 |
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310 | /** Extend glyph bitmap to cover a patricular pixel.
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311 | *
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312 | * @param bmp Glyph bitmap
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313 | * @param pos Pixel position
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314 | *
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315 | * @return EOK on sucesss, ENOMEM if out of memory
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316 | */
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317 | static errno_t gfx_glyph_bmp_extend(gfx_glyph_bmp_t *bmp, gfx_coord2_t *pos)
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318 | {
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319 | gfx_rect_t prect;
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320 | gfx_rect_t nrect;
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321 | int *npixels;
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322 | size_t npitch;
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323 | size_t opitch;
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324 | gfx_coord_t x, y;
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325 |
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326 | /* Compute new rectangle enveloping current rectangle and new pixel */
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327 | prect.p0 = *pos;
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328 | prect.p1.x = prect.p0.x + 1;
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329 | prect.p1.y = prect.p0.y + 1;
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330 |
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331 | gfx_rect_envelope(&bmp->rect, &prect, &nrect);
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332 |
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333 | /* Allocate new pixel array */
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334 | npixels = calloc((nrect.p1.x - nrect.p0.x) *
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335 | (nrect.p1.y - nrect.p0.y), sizeof(int));
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336 | if (npixels == NULL)
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337 | return ENOMEM;
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338 |
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339 | /* Transfer pixel data */
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340 | opitch = bmp->rect.p1.x - bmp->rect.p0.x;
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341 | npitch = nrect.p1.x - nrect.p0.x;
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342 |
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343 | for (y = bmp->rect.p0.y; y < bmp->rect.p1.y; y++) {
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344 | for (x = bmp->rect.p0.x; x < bmp->rect.p1.x; x++) {
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345 | npixels[(y - nrect.p0.y) * npitch + x - nrect.p0.x] =
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346 | bmp->pixels[(y - bmp->rect.p0.y) * opitch +
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347 | x - bmp->rect.p0.x];
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348 | }
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349 | }
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350 |
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351 | /* Switch new and old data */
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352 | free(bmp->pixels);
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353 | bmp->pixels = npixels;
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354 | bmp->rect = nrect;
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355 |
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356 | return EOK;
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357 | }
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358 |
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359 | /** @}
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360 | */
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