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8619 | maxcodehac | 1 | /* |
2 | jbig2dec |
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3 | |||
4 | Copyright (C) 2001-2005 Artifex Software, Inc. |
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5 | |||
6 | This software is distributed under license and may not |
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7 | be copied, modified or distributed except as expressly |
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8 | authorized under the terms of the license contained in |
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9 | the file LICENSE in this distribution. |
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10 | |||
11 | For further licensing information refer to http://artifex.com/ or |
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12 | contact Artifex Software, Inc., 7 Mt. Lassen Drive - Suite A-134, |
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13 | San Rafael, CA 94903, U.S.A., +1(415)492-9861. |
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14 | */ |
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15 | |||
16 | #ifdef HAVE_CONFIG_H |
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17 | #include "config.h" |
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18 | #endif |
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19 | #include "os_types.h" |
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20 | |||
21 | #include |
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22 | #include |
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23 | #include |
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24 | |||
25 | #include "jbig2.h" |
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26 | #include "jbig2_priv.h" |
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27 | #include "jbig2_image.h" |
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28 | |||
29 | |||
30 | /* allocate a Jbig2Image structure and its associated bitmap */ |
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31 | Jbig2Image* jbig2_image_new(Jbig2Ctx *ctx, int width, int height) |
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32 | { |
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33 | Jbig2Image *image; |
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34 | int stride; |
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35 | |||
36 | image = (Jbig2Image *)jbig2_alloc(ctx->allocator, sizeof(*image)); |
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37 | if (image == NULL) { |
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38 | jbig2_error(ctx, JBIG2_SEVERITY_FATAL, -1, |
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39 | "could not allocate image structure"); |
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40 | return NULL; |
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41 | } |
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42 | |||
43 | stride = ((width - 1) >> 3) + 1; /* generate a byte-aligned stride */ |
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44 | image->data = (uint8_t *)jbig2_alloc(ctx->allocator, stride*height); |
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45 | if (image->data == NULL) { |
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46 | jbig2_error(ctx, JBIG2_SEVERITY_FATAL, -1, |
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47 | "could not allocate image data buffer! [%d bytes]\n", stride*height); |
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48 | jbig2_free(ctx->allocator, image); |
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49 | return NULL; |
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50 | } |
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51 | |||
52 | image->width = width; |
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53 | image->height = height; |
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54 | image->stride = stride; |
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55 | image->refcount = 1; |
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56 | |||
57 | return image; |
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58 | } |
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59 | |||
60 | /* clone an image pointer by bumping its reference count */ |
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61 | Jbig2Image* jbig2_image_clone(Jbig2Ctx *ctx, Jbig2Image *image) |
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62 | { |
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63 | image->refcount++; |
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64 | return image; |
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65 | } |
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66 | |||
67 | /* release an image pointer, freeing it it appropriate */ |
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68 | void jbig2_image_release(Jbig2Ctx *ctx, Jbig2Image *image) |
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69 | { |
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70 | image->refcount--; |
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71 | if (!image->refcount) jbig2_image_free(ctx, image); |
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72 | } |
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73 | |||
74 | /* free a Jbig2Image structure and its associated memory */ |
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75 | void jbig2_image_free(Jbig2Ctx *ctx, Jbig2Image *image) |
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76 | { |
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77 | jbig2_free(ctx->allocator, image->data); |
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78 | jbig2_free(ctx->allocator, image); |
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79 | } |
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80 | |||
81 | /* resize a Jbig2Image */ |
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82 | Jbig2Image *jbig2_image_resize(Jbig2Ctx *ctx, Jbig2Image *image, |
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83 | int width, int height) |
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84 | { |
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85 | if (width == image->width) { |
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86 | /* use the same stride, just change the length */ |
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87 | image->data = jbig2_realloc(ctx->allocator, |
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88 | image->data, image->stride*height); |
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89 | if (image->data == NULL) { |
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90 | jbig2_error(ctx, JBIG2_SEVERITY_FATAL, -1, |
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91 | "could not resize image buffer!"); |
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92 | return NULL; |
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93 | } |
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94 | if (height > image->height) { |
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95 | memset(image->data + image->height*image->stride, |
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96 | 0, (height - image->height)*image->stride); |
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97 | } |
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98 | image->height = height; |
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99 | |||
100 | } else { |
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101 | /* we must allocate a new image buffer and copy */ |
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102 | jbig2_error(ctx, JBIG2_SEVERITY_WARNING, -1, |
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103 | "jbig2_image_resize called with a different width (NYI)"); |
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104 | } |
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105 | |||
106 | return NULL; |
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107 | } |
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108 | |||
109 | /* composite one jbig2_image onto another |
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110 | slow but general version */ |
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111 | int jbig2_image_compose_unopt(Jbig2Ctx *ctx, |
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112 | Jbig2Image *dst, Jbig2Image *src, |
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113 | int x, int y, Jbig2ComposeOp op) |
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114 | { |
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115 | int i, j; |
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116 | int sw = src->width; |
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117 | int sh = src->height; |
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118 | int sx = 0; |
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119 | int sy = 0; |
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120 | |||
121 | /* clip to the dst image boundaries */ |
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122 | if (x < 0) { sx += -x; sw -= -x; x = 0; } |
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123 | if (y < 0) { sy += -y; sh -= -y; y = 0; } |
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124 | if (x + sw >= dst->width) sw = dst->width - x; |
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125 | if (y + sh >= dst->height) sh = dst->height - y; |
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126 | |||
127 | switch (op) { |
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128 | case JBIG2_COMPOSE_OR: |
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129 | for (j = 0; j < sh; j++) { |
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130 | for (i = 0; i < sw; i++) { |
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131 | jbig2_image_set_pixel(dst, i+x, j+y, |
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132 | jbig2_image_get_pixel(src, i+sx, j+sy) | |
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133 | jbig2_image_get_pixel(dst, i+x, j+y)); |
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134 | } |
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135 | } |
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136 | break; |
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137 | case JBIG2_COMPOSE_AND: |
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138 | for (j = 0; j < sh; j++) { |
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139 | for (i = 0; i < sw; i++) { |
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140 | jbig2_image_set_pixel(dst, i+x, j+y, |
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141 | jbig2_image_get_pixel(src, i+sx, j+sy) & |
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142 | jbig2_image_get_pixel(dst, i+x, j+y)); |
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143 | } |
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144 | } |
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145 | break; |
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146 | case JBIG2_COMPOSE_XOR: |
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147 | for (j = 0; j < sh; j++) { |
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148 | for (i = 0; i < sw; i++) { |
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149 | jbig2_image_set_pixel(dst, i+x, j+y, |
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150 | jbig2_image_get_pixel(src, i+sx, j+sy) ^ |
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151 | jbig2_image_get_pixel(dst, i+x, j+y)); |
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152 | } |
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153 | } |
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154 | break; |
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155 | case JBIG2_COMPOSE_XNOR: |
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156 | for (j = 0; j < sh; j++) { |
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157 | for (i = 0; i < sw; i++) { |
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158 | jbig2_image_set_pixel(dst, i+x, j+y, |
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159 | ~(jbig2_image_get_pixel(src, i+sx, j+sy) ^ |
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160 | jbig2_image_get_pixel(dst, i+x, j+y))); |
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161 | } |
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162 | } |
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163 | break; |
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164 | case JBIG2_COMPOSE_REPLACE: |
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165 | for (j = 0; j < sh; j++) { |
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166 | for (i = 0; i < sw; i++) { |
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167 | jbig2_image_set_pixel(dst, i+x, j+y, |
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168 | jbig2_image_get_pixel(src, i+sx, j+sy)); |
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169 | } |
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170 | } |
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171 | break; |
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172 | } |
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173 | |||
174 | return 0; |
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175 | } |
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176 | |||
177 | /* composite one jbig2_image onto another */ |
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178 | int jbig2_image_compose(Jbig2Ctx *ctx, Jbig2Image *dst, Jbig2Image *src, |
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179 | int x, int y, Jbig2ComposeOp op) |
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180 | { |
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181 | int i, j; |
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182 | int w, h; |
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183 | int leftbyte, rightbyte; |
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184 | int shift; |
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185 | uint8_t *s, *ss; |
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186 | uint8_t *d, *dd; |
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187 | uint8_t mask, rightmask; |
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188 | |||
189 | if (op != JBIG2_COMPOSE_OR) { |
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190 | /* hand off the the general routine */ |
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191 | return jbig2_image_compose_unopt(ctx, dst, src, x, y, op); |
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192 | } |
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193 | |||
194 | /* clip */ |
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195 | w = src->width; |
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196 | h = src->height; |
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197 | ss = src->data; |
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198 | /* FIXME: this isn't sufficient for the < 0 cases */ |
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199 | if (x < 0) { w += x; x = 0; } |
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200 | if (y < 0) { h += y; y = 0; } |
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201 | w = (x + w < dst->width) ? w : dst->width - x; |
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202 | h = (y + h < dst->height) ? h : dst->height - y; |
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203 | #ifdef JBIG2_DEBUG |
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204 | jbig2_error(ctx, JBIG2_SEVERITY_DEBUG, -1, |
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205 | "compositing %dx%d at (%d, %d) after clipping\n", |
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206 | w, h, x, y); |
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207 | #endif |
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208 | |||
209 | #if 0 |
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210 | /* special case complete/strip replacement */ |
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211 | /* disabled because it's only safe to do when the destination |
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212 | buffer is all-blank. */ |
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213 | if ((x == 0) && (w == src->width)) { |
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214 | memcpy(dst->data + y*dst->stride, src->data, h*src->stride); |
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215 | return 0; |
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216 | } |
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217 | #endif |
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218 | |||
219 | leftbyte = x >> 3; |
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220 | rightbyte = (x + w - 1) >> 3; |
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221 | shift = x & 7; |
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222 | |||
223 | /* general OR case */ |
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224 | s = ss; |
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225 | d = dd = dst->data + y*dst->stride + leftbyte; |
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226 | if (leftbyte == rightbyte) { |
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227 | mask = 0x100 - (0x100 >> w); |
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228 | for (j = 0; j < h; j++) { |
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229 | *d |= (*s & mask) >> shift; |
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230 | d += dst->stride; |
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231 | s += src->stride; |
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232 | } |
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233 | } else if (shift == 0) { |
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234 | rightmask = (w & 7) ? 0x100 - (1 << (8 - (w & 7))) : 0xFF; |
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235 | for (j = 0; j < h; j++) { |
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236 | for (i = leftbyte; i < rightbyte; i++) |
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237 | *d++ |= *s++; |
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238 | *d |= *s & rightmask; |
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239 | d = (dd += dst->stride); |
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240 | s = (ss += src->stride); |
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241 | } |
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242 | } else { |
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243 | bool overlap = (((w + 7) >> 3) < ((x + w + 7) >> 3) - (x >> 3)); |
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244 | mask = 0x100 - (1 << shift); |
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245 | if (overlap) |
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246 | rightmask = (0x100 - (0x100 >> ((x + w) & 7))) >> (8 - shift); |
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247 | else |
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248 | rightmask = 0x100 - (0x100 >> (w & 7)); |
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249 | for (j = 0; j < h; j++) { |
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250 | *d++ |= (*s & mask) >> shift; |
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251 | for(i = leftbyte; i < rightbyte - 1; i++) { |
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252 | *d |= ((*s++ & ~mask) << (8 - shift)); |
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253 | *d++ |= ((*s & mask) >> shift); |
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254 | } |
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255 | if (overlap) |
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256 | *d |= (*s & rightmask) << (8 - shift); |
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257 | else |
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258 | *d |= ((s[0] & ~mask) << (8 - shift)) | |
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259 | ((s[1] & rightmask) >> shift); |
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260 | d = (dd += dst->stride); |
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261 | s = (ss += src->stride); |
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262 | } |
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263 | } |
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264 | |||
265 | return 0; |
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266 | } |
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267 | |||
268 | |||
269 | /* initialize an image bitmap to a constant value */ |
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270 | void jbig2_image_clear(Jbig2Ctx *ctx, Jbig2Image *image, int value) |
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271 | { |
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272 | const uint8_t fill = value ? 0xFF : 0x00; |
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273 | |||
274 | memset(image->data, fill, image->stride*image->height); |
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275 | } |
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276 | |||
277 | /* look up a pixel value in an image. |
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278 | returns 0 outside the image frame for the convenience of |
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279 | the template code |
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280 | */ |
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281 | int jbig2_image_get_pixel(Jbig2Image *image, int x, int y) |
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282 | { |
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283 | const int w = image->width; |
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284 | const int h = image->height; |
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285 | const int byte = (x >> 3) + y*image->stride; |
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286 | const int bit = 7 - (x & 7); |
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287 | |||
288 | if ((x < 0) || (x >= w)) return 0; |
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289 | if ((y < 0) || (y >= h)) return 0; |
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290 | |||
291 | return ((image->data[byte]>>bit) & 1); |
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292 | } |
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293 | |||
294 | /* set an individual pixel value in an image */ |
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295 | int jbig2_image_set_pixel(Jbig2Image *image, int x, int y, bool value) |
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296 | { |
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297 | const int w = image->width; |
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298 | const int h = image->height; |
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299 | int scratch, mask; |
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300 | int bit, byte; |
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301 | |||
302 | if ((x < 0) || (x >= w)) return 0; |
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303 | if ((y < 0) || (y >= h)) return 0; |
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304 | |||
305 | byte = (x >> 3) + y*image->stride; |
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306 | bit = 7 - (x & 7); |
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307 | mask = (1 << bit) ^ 0xff; |
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308 | |||
309 | scratch = image->data[byte] & mask; |
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310 | image->data[byte] = scratch | (value << bit); |
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311 | |||
312 | return 1; |
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313 | }><>><>>>>>><>><>><>>>><>>>>><>>>>>>>>>>>>>>>>>>> |