1 | /* CCVT_C2: Convert an image from yuv colourspace to rgb |
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2 | Copyright (C) 2001 Tony Hague <no.email@noemail.com> |
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3 | |
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4 | |
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5 | This program is free software; you can redistribute it and/or modify |
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6 | it under the terms of the GNU General Public License as published by |
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7 | the Free Software Foundation; either version 2 of the License, or |
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8 | (at your option) any later version. |
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9 | |
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10 | This program is distributed in the hope that it will be useful, |
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11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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13 | GNU General Public License for more details. |
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14 | |
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15 | You should have received a copy of the GNU General Public License |
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16 | along with this program; if not, write to the Free Software |
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17 | Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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18 | |
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19 | For questions, remarks, patches, etc. for this program, the author can be |
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20 | reached at nemosoft@smcc.demon.nl. |
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21 | */ |
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22 | |
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23 | #include "ccvt.h" |
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24 | #include "ccvt_types.h" |
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25 | |
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26 | /* by suitable definition of PIXTYPE, can do yuv to rgb or bgr, with or |
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27 | without word alignment */ |
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28 | |
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29 | /* This doesn't exactly earn a prize in a programming beauty contest. */ |
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30 | |
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31 | #define WHOLE_FUNC2RGB(type) \ |
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32 | const unsigned char *y1, *y2, *u, *v; \ |
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33 | PIXTYPE_##type *l1, *l2; \ |
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34 | int r, g, b, cr, cg, cb, yp, j, i; \ |
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35 | \ |
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36 | if ((width & 1) || (height & 1)) \ |
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37 | return; \ |
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38 | \ |
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39 | l1 = (PIXTYPE_##type *)dst; \ |
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40 | l2 = l1 + width; \ |
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41 | y1 = (unsigned char *)src; \ |
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42 | y2 = y1 + width; \ |
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43 | u = (unsigned char *)src + width * height; \ |
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44 | v = u + (width * height) / 4; \ |
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45 | j = height / 2; \ |
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46 | while (j--) { \ |
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47 | i = width / 2; \ |
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48 | while (i--) { \ |
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49 | /* Since U & V are valid for 4 pixels, repeat code 4 \ |
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50 | times for different Y */ \ |
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51 | cb = ((*u-128) * 454)>>8; \ |
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52 | cr = ((*v-128) * 359)>>8; \ |
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53 | cg = ((*v-128) * 183 + (*u-128) * 88)>>8; \ |
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54 | \ |
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55 | yp = *(y1++); \ |
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56 | r = yp + cr; \ |
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57 | b = yp + cb; \ |
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58 | g = yp - cg; \ |
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59 | SAT(r); \ |
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60 | SAT(g); \ |
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61 | SAT(b); \ |
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62 | l1->b = b; \ |
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63 | l1->g = g; \ |
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64 | l1->r = r; \ |
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65 | l1++; \ |
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66 | \ |
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67 | yp = *(y1++); \ |
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68 | r = yp + cr; \ |
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69 | b = yp + cb; \ |
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70 | g = yp - cg; \ |
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71 | SAT(r); \ |
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72 | SAT(g); \ |
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73 | SAT(b); \ |
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74 | l1->b = b; \ |
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75 | l1->g = g; \ |
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76 | l1->r = r; \ |
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77 | l1++; \ |
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78 | \ |
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79 | yp = *(y2++); \ |
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80 | r = yp + cr; \ |
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81 | b = yp + cb; \ |
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82 | g = yp - cg; \ |
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83 | SAT(r); \ |
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84 | SAT(g); \ |
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85 | SAT(b); \ |
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86 | l2->b = b; \ |
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87 | l2->g = g; \ |
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88 | l2->r = r; \ |
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89 | l2++; \ |
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90 | \ |
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91 | yp = *(y2++); \ |
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92 | r = yp + cr; \ |
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93 | b = yp + cb; \ |
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94 | g = yp - cg; \ |
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95 | SAT(r); \ |
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96 | SAT(g); \ |
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97 | SAT(b); \ |
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98 | l2->b = b; \ |
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99 | l2->g = g; \ |
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100 | l2->r = r; \ |
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101 | l2++; \ |
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102 | \ |
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103 | u++; \ |
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104 | v++; \ |
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105 | } \ |
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106 | y1 = y2; \ |
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107 | y2 += width; \ |
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108 | l1 = l2; \ |
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109 | l2 += width; \ |
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110 | } |
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111 | |
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112 | |
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113 | |
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114 | |
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115 | void ccvt_420p_bgr32(int width, int height, const void *src, void *dst) |
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116 | { |
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117 | WHOLE_FUNC2RGB(bgr32) |
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118 | } |
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119 | |
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120 | void ccvt_420p_bgr24(int width, int height, const void *src, void *dst) |
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121 | { |
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122 | WHOLE_FUNC2RGB(bgr24) |
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123 | } |
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124 | |
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125 | void ccvt_420p_rgb32(int width, int height, const void *src, void *dst) |
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126 | { |
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127 | WHOLE_FUNC2RGB(rgb32) |
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128 | } |
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129 | |
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130 | void ccvt_420p_rgb24(int width, int height, const void *src, void *dst) |
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131 | { |
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132 | WHOLE_FUNC2RGB(rgb24) |
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133 | } |
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134 | |
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