1 | /* |
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2 | * transupp.c |
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3 | * |
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4 | * Copyright (C) 1997-2011, Thomas G. Lane, Guido Vollbeding. |
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5 | * This file is part of the Independent JPEG Group's software. |
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6 | * For conditions of distribution and use, see the accompanying README file. |
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7 | * |
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8 | * This file contains image transformation routines and other utility code |
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9 | * used by the jpegtran sample application. These are NOT part of the core |
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10 | * JPEG library. But we keep these routines separate from jpegtran.c to |
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11 | * ease the task of maintaining jpegtran-like programs that have other user |
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12 | * interfaces. |
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13 | */ |
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14 | |
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15 | /* Although this file really shouldn't have access to the library internals, |
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16 | * it's helpful to let it call jround_up() and jcopy_block_row(). |
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17 | */ |
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18 | #define JPEG_INTERNALS |
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19 | |
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20 | #include "jinclude.h" |
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21 | #include "jpeglib.h" |
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22 | #include "transupp.h" /* My own external interface */ |
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23 | #include <ctype.h> /* to declare isdigit() */ |
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24 | |
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25 | |
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26 | #if TRANSFORMS_SUPPORTED |
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27 | |
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28 | /* |
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29 | * Lossless image transformation routines. These routines work on DCT |
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30 | * coefficient arrays and thus do not require any lossy decompression |
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31 | * or recompression of the image. |
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32 | * Thanks to Guido Vollbeding for the initial design and code of this feature, |
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33 | * and to Ben Jackson for introducing the cropping feature. |
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34 | * |
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35 | * Horizontal flipping is done in-place, using a single top-to-bottom |
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36 | * pass through the virtual source array. It will thus be much the |
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37 | * fastest option for images larger than main memory. |
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38 | * |
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39 | * The other routines require a set of destination virtual arrays, so they |
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40 | * need twice as much memory as jpegtran normally does. The destination |
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41 | * arrays are always written in normal scan order (top to bottom) because |
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42 | * the virtual array manager expects this. The source arrays will be scanned |
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43 | * in the corresponding order, which means multiple passes through the source |
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44 | * arrays for most of the transforms. That could result in much thrashing |
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45 | * if the image is larger than main memory. |
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46 | * |
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47 | * If cropping or trimming is involved, the destination arrays may be smaller |
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48 | * than the source arrays. Note it is not possible to do horizontal flip |
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49 | * in-place when a nonzero Y crop offset is specified, since we'd have to move |
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50 | * data from one block row to another but the virtual array manager doesn't |
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51 | * guarantee we can touch more than one row at a time. So in that case, |
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52 | * we have to use a separate destination array. |
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53 | * |
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54 | * Some notes about the operating environment of the individual transform |
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55 | * routines: |
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56 | * 1. Both the source and destination virtual arrays are allocated from the |
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57 | * source JPEG object, and therefore should be manipulated by calling the |
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58 | * source's memory manager. |
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59 | * 2. The destination's component count should be used. It may be smaller |
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60 | * than the source's when forcing to grayscale. |
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61 | * 3. Likewise the destination's sampling factors should be used. When |
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62 | * forcing to grayscale the destination's sampling factors will be all 1, |
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63 | * and we may as well take that as the effective iMCU size. |
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64 | * 4. When "trim" is in effect, the destination's dimensions will be the |
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65 | * trimmed values but the source's will be untrimmed. |
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66 | * 5. When "crop" is in effect, the destination's dimensions will be the |
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67 | * cropped values but the source's will be uncropped. Each transform |
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68 | * routine is responsible for picking up source data starting at the |
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69 | * correct X and Y offset for the crop region. (The X and Y offsets |
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70 | * passed to the transform routines are measured in iMCU blocks of the |
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71 | * destination.) |
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72 | * 6. All the routines assume that the source and destination buffers are |
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73 | * padded out to a full iMCU boundary. This is true, although for the |
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74 | * source buffer it is an undocumented property of jdcoefct.c. |
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75 | */ |
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76 | |
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77 | |
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78 | LOCAL(void) |
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79 | do_crop (j_decompress_ptr srcinfo, j_compress_ptr dstinfo, |
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80 | JDIMENSION x_crop_offset, JDIMENSION y_crop_offset, |
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81 | jvirt_barray_ptr *src_coef_arrays, |
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82 | jvirt_barray_ptr *dst_coef_arrays) |
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83 | /* Crop. This is only used when no rotate/flip is requested with the crop. */ |
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84 | { |
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85 | JDIMENSION dst_blk_y, x_crop_blocks, y_crop_blocks; |
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86 | int ci, offset_y; |
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87 | JBLOCKARRAY src_buffer, dst_buffer; |
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88 | jpeg_component_info *compptr; |
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89 | |
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90 | /* We simply have to copy the right amount of data (the destination's |
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91 | * image size) starting at the given X and Y offsets in the source. |
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92 | */ |
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93 | for (ci = 0; ci < dstinfo->num_components; ci++) { |
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94 | compptr = dstinfo->comp_info + ci; |
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95 | x_crop_blocks = x_crop_offset * compptr->h_samp_factor; |
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96 | y_crop_blocks = y_crop_offset * compptr->v_samp_factor; |
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97 | for (dst_blk_y = 0; dst_blk_y < compptr->height_in_blocks; |
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98 | dst_blk_y += compptr->v_samp_factor) { |
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99 | dst_buffer = (*srcinfo->mem->access_virt_barray) |
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100 | ((j_common_ptr) srcinfo, dst_coef_arrays[ci], dst_blk_y, |
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101 | (JDIMENSION) compptr->v_samp_factor, TRUE); |
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102 | src_buffer = (*srcinfo->mem->access_virt_barray) |
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103 | ((j_common_ptr) srcinfo, src_coef_arrays[ci], |
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104 | dst_blk_y + y_crop_blocks, |
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105 | (JDIMENSION) compptr->v_samp_factor, FALSE); |
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106 | for (offset_y = 0; offset_y < compptr->v_samp_factor; offset_y++) { |
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107 | jcopy_block_row(src_buffer[offset_y] + x_crop_blocks, |
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108 | dst_buffer[offset_y], |
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109 | compptr->width_in_blocks); |
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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 | |
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116 | LOCAL(void) |
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117 | do_flip_h_no_crop (j_decompress_ptr srcinfo, j_compress_ptr dstinfo, |
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118 | JDIMENSION x_crop_offset, |
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119 | jvirt_barray_ptr *src_coef_arrays) |
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120 | /* Horizontal flip; done in-place, so no separate dest array is required. |
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121 | * NB: this only works when y_crop_offset is zero. |
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122 | */ |
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123 | { |
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124 | JDIMENSION MCU_cols, comp_width, blk_x, blk_y, x_crop_blocks; |
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125 | int ci, k, offset_y; |
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126 | JBLOCKARRAY buffer; |
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127 | JCOEFPTR ptr1, ptr2; |
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128 | JCOEF temp1, temp2; |
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129 | jpeg_component_info *compptr; |
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130 | |
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131 | /* Horizontal mirroring of DCT blocks is accomplished by swapping |
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132 | * pairs of blocks in-place. Within a DCT block, we perform horizontal |
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133 | * mirroring by changing the signs of odd-numbered columns. |
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134 | * Partial iMCUs at the right edge are left untouched. |
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135 | */ |
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136 | MCU_cols = srcinfo->output_width / |
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137 | (dstinfo->max_h_samp_factor * dstinfo->min_DCT_h_scaled_size); |
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138 | |
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139 | for (ci = 0; ci < dstinfo->num_components; ci++) { |
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140 | compptr = dstinfo->comp_info + ci; |
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141 | comp_width = MCU_cols * compptr->h_samp_factor; |
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142 | x_crop_blocks = x_crop_offset * compptr->h_samp_factor; |
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143 | for (blk_y = 0; blk_y < compptr->height_in_blocks; |
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144 | blk_y += compptr->v_samp_factor) { |
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145 | buffer = (*srcinfo->mem->access_virt_barray) |
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146 | ((j_common_ptr) srcinfo, src_coef_arrays[ci], blk_y, |
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147 | (JDIMENSION) compptr->v_samp_factor, TRUE); |
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148 | for (offset_y = 0; offset_y < compptr->v_samp_factor; offset_y++) { |
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149 | /* Do the mirroring */ |
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150 | for (blk_x = 0; blk_x * 2 < comp_width; blk_x++) { |
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151 | ptr1 = buffer[offset_y][blk_x]; |
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152 | ptr2 = buffer[offset_y][comp_width - blk_x - 1]; |
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153 | /* this unrolled loop doesn't need to know which row it's on... */ |
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154 | for (k = 0; k < DCTSIZE2; k += 2) { |
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155 | temp1 = *ptr1; /* swap even column */ |
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156 | temp2 = *ptr2; |
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157 | *ptr1++ = temp2; |
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158 | *ptr2++ = temp1; |
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159 | temp1 = *ptr1; /* swap odd column with sign change */ |
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160 | temp2 = *ptr2; |
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161 | *ptr1++ = -temp2; |
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162 | *ptr2++ = -temp1; |
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163 | } |
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164 | } |
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165 | if (x_crop_blocks > 0) { |
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166 | /* Now left-justify the portion of the data to be kept. |
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167 | * We can't use a single jcopy_block_row() call because that routine |
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168 | * depends on memcpy(), whose behavior is unspecified for overlapping |
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169 | * source and destination areas. Sigh. |
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170 | */ |
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171 | for (blk_x = 0; blk_x < compptr->width_in_blocks; blk_x++) { |
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172 | jcopy_block_row(buffer[offset_y] + blk_x + x_crop_blocks, |
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173 | buffer[offset_y] + blk_x, |
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174 | (JDIMENSION) 1); |
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175 | } |
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176 | } |
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177 | } |
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178 | } |
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179 | } |
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180 | } |
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181 | |
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182 | |
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183 | LOCAL(void) |
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184 | do_flip_h (j_decompress_ptr srcinfo, j_compress_ptr dstinfo, |
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185 | JDIMENSION x_crop_offset, JDIMENSION y_crop_offset, |
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186 | jvirt_barray_ptr *src_coef_arrays, |
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187 | jvirt_barray_ptr *dst_coef_arrays) |
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188 | /* Horizontal flip in general cropping case */ |
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189 | { |
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190 | JDIMENSION MCU_cols, comp_width, dst_blk_x, dst_blk_y; |
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191 | JDIMENSION x_crop_blocks, y_crop_blocks; |
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192 | int ci, k, offset_y; |
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193 | JBLOCKARRAY src_buffer, dst_buffer; |
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194 | JBLOCKROW src_row_ptr, dst_row_ptr; |
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195 | JCOEFPTR src_ptr, dst_ptr; |
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196 | jpeg_component_info *compptr; |
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197 | |
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198 | /* Here we must output into a separate array because we can't touch |
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199 | * different rows of a single virtual array simultaneously. Otherwise, |
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200 | * this is essentially the same as the routine above. |
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201 | */ |
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202 | MCU_cols = srcinfo->output_width / |
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203 | (dstinfo->max_h_samp_factor * dstinfo->min_DCT_h_scaled_size); |
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204 | |
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205 | for (ci = 0; ci < dstinfo->num_components; ci++) { |
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206 | compptr = dstinfo->comp_info + ci; |
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207 | comp_width = MCU_cols * compptr->h_samp_factor; |
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208 | x_crop_blocks = x_crop_offset * compptr->h_samp_factor; |
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209 | y_crop_blocks = y_crop_offset * compptr->v_samp_factor; |
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210 | for (dst_blk_y = 0; dst_blk_y < compptr->height_in_blocks; |
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211 | dst_blk_y += compptr->v_samp_factor) { |
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212 | dst_buffer = (*srcinfo->mem->access_virt_barray) |
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213 | ((j_common_ptr) srcinfo, dst_coef_arrays[ci], dst_blk_y, |
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214 | (JDIMENSION) compptr->v_samp_factor, TRUE); |
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215 | src_buffer = (*srcinfo->mem->access_virt_barray) |
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216 | ((j_common_ptr) srcinfo, src_coef_arrays[ci], |
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217 | dst_blk_y + y_crop_blocks, |
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218 | (JDIMENSION) compptr->v_samp_factor, FALSE); |
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219 | for (offset_y = 0; offset_y < compptr->v_samp_factor; offset_y++) { |
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220 | dst_row_ptr = dst_buffer[offset_y]; |
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221 | src_row_ptr = src_buffer[offset_y]; |
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222 | for (dst_blk_x = 0; dst_blk_x < compptr->width_in_blocks; dst_blk_x++) { |
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223 | if (x_crop_blocks + dst_blk_x < comp_width) { |
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224 | /* Do the mirrorable blocks */ |
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225 | dst_ptr = dst_row_ptr[dst_blk_x]; |
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226 | src_ptr = src_row_ptr[comp_width - x_crop_blocks - dst_blk_x - 1]; |
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227 | /* this unrolled loop doesn't need to know which row it's on... */ |
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228 | for (k = 0; k < DCTSIZE2; k += 2) { |
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229 | *dst_ptr++ = *src_ptr++; /* copy even column */ |
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230 | *dst_ptr++ = - *src_ptr++; /* copy odd column with sign change */ |
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231 | } |
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232 | } else { |
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233 | /* Copy last partial block(s) verbatim */ |
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234 | jcopy_block_row(src_row_ptr + dst_blk_x + x_crop_blocks, |
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235 | dst_row_ptr + dst_blk_x, |
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236 | (JDIMENSION) 1); |
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237 | } |
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238 | } |
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239 | } |
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240 | } |
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241 | } |
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242 | } |
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243 | |
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244 | |
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245 | LOCAL(void) |
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246 | do_flip_v (j_decompress_ptr srcinfo, j_compress_ptr dstinfo, |
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247 | JDIMENSION x_crop_offset, JDIMENSION y_crop_offset, |
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248 | jvirt_barray_ptr *src_coef_arrays, |
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249 | jvirt_barray_ptr *dst_coef_arrays) |
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250 | /* Vertical flip */ |
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251 | { |
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252 | JDIMENSION MCU_rows, comp_height, dst_blk_x, dst_blk_y; |
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253 | JDIMENSION x_crop_blocks, y_crop_blocks; |
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254 | int ci, i, j, offset_y; |
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255 | JBLOCKARRAY src_buffer, dst_buffer; |
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256 | JBLOCKROW src_row_ptr, dst_row_ptr; |
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257 | JCOEFPTR src_ptr, dst_ptr; |
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258 | jpeg_component_info *compptr; |
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259 | |
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260 | /* We output into a separate array because we can't touch different |
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261 | * rows of the source virtual array simultaneously. Otherwise, this |
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262 | * is a pretty straightforward analog of horizontal flip. |
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263 | * Within a DCT block, vertical mirroring is done by changing the signs |
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264 | * of odd-numbered rows. |
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265 | * Partial iMCUs at the bottom edge are copied verbatim. |
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266 | */ |
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267 | MCU_rows = srcinfo->output_height / |
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268 | (dstinfo->max_v_samp_factor * dstinfo->min_DCT_v_scaled_size); |
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269 | |
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270 | for (ci = 0; ci < dstinfo->num_components; ci++) { |
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271 | compptr = dstinfo->comp_info + ci; |
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272 | comp_height = MCU_rows * compptr->v_samp_factor; |
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273 | x_crop_blocks = x_crop_offset * compptr->h_samp_factor; |
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274 | y_crop_blocks = y_crop_offset * compptr->v_samp_factor; |
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275 | for (dst_blk_y = 0; dst_blk_y < compptr->height_in_blocks; |
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276 | dst_blk_y += compptr->v_samp_factor) { |
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277 | dst_buffer = (*srcinfo->mem->access_virt_barray) |
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278 | ((j_common_ptr) srcinfo, dst_coef_arrays[ci], dst_blk_y, |
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279 | (JDIMENSION) compptr->v_samp_factor, TRUE); |
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280 | if (y_crop_blocks + dst_blk_y < comp_height) { |
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281 | /* Row is within the mirrorable area. */ |
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282 | src_buffer = (*srcinfo->mem->access_virt_barray) |
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283 | ((j_common_ptr) srcinfo, src_coef_arrays[ci], |
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284 | comp_height - y_crop_blocks - dst_blk_y - |
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285 | (JDIMENSION) compptr->v_samp_factor, |
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286 | (JDIMENSION) compptr->v_samp_factor, FALSE); |
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287 | } else { |
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288 | /* Bottom-edge blocks will be copied verbatim. */ |
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289 | src_buffer = (*srcinfo->mem->access_virt_barray) |
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290 | ((j_common_ptr) srcinfo, src_coef_arrays[ci], |
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291 | dst_blk_y + y_crop_blocks, |
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292 | (JDIMENSION) compptr->v_samp_factor, FALSE); |
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293 | } |
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294 | for (offset_y = 0; offset_y < compptr->v_samp_factor; offset_y++) { |
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295 | if (y_crop_blocks + dst_blk_y < comp_height) { |
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296 | /* Row is within the mirrorable area. */ |
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297 | dst_row_ptr = dst_buffer[offset_y]; |
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298 | src_row_ptr = src_buffer[compptr->v_samp_factor - offset_y - 1]; |
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299 | src_row_ptr += x_crop_blocks; |
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300 | for (dst_blk_x = 0; dst_blk_x < compptr->width_in_blocks; |
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301 | dst_blk_x++) { |
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302 | dst_ptr = dst_row_ptr[dst_blk_x]; |
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303 | src_ptr = src_row_ptr[dst_blk_x]; |
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304 | for (i = 0; i < DCTSIZE; i += 2) { |
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305 | /* copy even row */ |
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306 | for (j = 0; j < DCTSIZE; j++) |
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307 | *dst_ptr++ = *src_ptr++; |
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308 | /* copy odd row with sign change */ |
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309 | for (j = 0; j < DCTSIZE; j++) |
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310 | *dst_ptr++ = - *src_ptr++; |
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311 | } |
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312 | } |
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313 | } else { |
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314 | /* Just copy row verbatim. */ |
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315 | jcopy_block_row(src_buffer[offset_y] + x_crop_blocks, |
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316 | dst_buffer[offset_y], |
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317 | compptr->width_in_blocks); |
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318 | } |
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319 | } |
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320 | } |
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321 | } |
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322 | } |
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323 | |
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324 | |
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325 | LOCAL(void) |
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326 | do_transpose (j_decompress_ptr srcinfo, j_compress_ptr dstinfo, |
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327 | JDIMENSION x_crop_offset, JDIMENSION y_crop_offset, |
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328 | jvirt_barray_ptr *src_coef_arrays, |
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329 | jvirt_barray_ptr *dst_coef_arrays) |
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330 | /* Transpose source into destination */ |
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331 | { |
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332 | JDIMENSION dst_blk_x, dst_blk_y, x_crop_blocks, y_crop_blocks; |
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333 | int ci, i, j, offset_x, offset_y; |
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334 | JBLOCKARRAY src_buffer, dst_buffer; |
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335 | JCOEFPTR src_ptr, dst_ptr; |
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336 | jpeg_component_info *compptr; |
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337 | |
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338 | /* Transposing pixels within a block just requires transposing the |
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339 | * DCT coefficients. |
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340 | * Partial iMCUs at the edges require no special treatment; we simply |
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341 | * process all the available DCT blocks for every component. |
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342 | */ |
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343 | for (ci = 0; ci < dstinfo->num_components; ci++) { |
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344 | compptr = dstinfo->comp_info + ci; |
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345 | x_crop_blocks = x_crop_offset * compptr->h_samp_factor; |
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346 | y_crop_blocks = y_crop_offset * compptr->v_samp_factor; |
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347 | for (dst_blk_y = 0; dst_blk_y < compptr->height_in_blocks; |
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348 | dst_blk_y += compptr->v_samp_factor) { |
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349 | dst_buffer = (*srcinfo->mem->access_virt_barray) |
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350 | ((j_common_ptr) srcinfo, dst_coef_arrays[ci], dst_blk_y, |
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351 | (JDIMENSION) compptr->v_samp_factor, TRUE); |
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352 | for (offset_y = 0; offset_y < compptr->v_samp_factor; offset_y++) { |
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353 | for (dst_blk_x = 0; dst_blk_x < compptr->width_in_blocks; |
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354 | dst_blk_x += compptr->h_samp_factor) { |
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355 | src_buffer = (*srcinfo->mem->access_virt_barray) |
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356 | ((j_common_ptr) srcinfo, src_coef_arrays[ci], |
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357 | dst_blk_x + x_crop_blocks, |
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358 | (JDIMENSION) compptr->h_samp_factor, FALSE); |
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359 | for (offset_x = 0; offset_x < compptr->h_samp_factor; offset_x++) { |
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360 | dst_ptr = dst_buffer[offset_y][dst_blk_x + offset_x]; |
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361 | src_ptr = src_buffer[offset_x][dst_blk_y + offset_y + y_crop_blocks]; |
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362 | for (i = 0; i < DCTSIZE; i++) |
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363 | for (j = 0; j < DCTSIZE; j++) |
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364 | dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j]; |
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365 | } |
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366 | } |
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367 | } |
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368 | } |
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369 | } |
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370 | } |
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371 | |
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372 | |
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373 | LOCAL(void) |
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374 | do_rot_90 (j_decompress_ptr srcinfo, j_compress_ptr dstinfo, |
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375 | JDIMENSION x_crop_offset, JDIMENSION y_crop_offset, |
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376 | jvirt_barray_ptr *src_coef_arrays, |
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377 | jvirt_barray_ptr *dst_coef_arrays) |
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378 | /* 90 degree rotation is equivalent to |
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379 | * 1. Transposing the image; |
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380 | * 2. Horizontal mirroring. |
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381 | * These two steps are merged into a single processing routine. |
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382 | */ |
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383 | { |
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384 | JDIMENSION MCU_cols, comp_width, dst_blk_x, dst_blk_y; |
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385 | JDIMENSION x_crop_blocks, y_crop_blocks; |
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386 | int ci, i, j, offset_x, offset_y; |
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387 | JBLOCKARRAY src_buffer, dst_buffer; |
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388 | JCOEFPTR src_ptr, dst_ptr; |
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389 | jpeg_component_info *compptr; |
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390 | |
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391 | /* Because of the horizontal mirror step, we can't process partial iMCUs |
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392 | * at the (output) right edge properly. They just get transposed and |
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393 | * not mirrored. |
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394 | */ |
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395 | MCU_cols = srcinfo->output_height / |
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396 | (dstinfo->max_h_samp_factor * dstinfo->min_DCT_h_scaled_size); |
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397 | |
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398 | for (ci = 0; ci < dstinfo->num_components; ci++) { |
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399 | compptr = dstinfo->comp_info + ci; |
---|
400 | comp_width = MCU_cols * compptr->h_samp_factor; |
---|
401 | x_crop_blocks = x_crop_offset * compptr->h_samp_factor; |
---|
402 | y_crop_blocks = y_crop_offset * compptr->v_samp_factor; |
---|
403 | for (dst_blk_y = 0; dst_blk_y < compptr->height_in_blocks; |
---|
404 | dst_blk_y += compptr->v_samp_factor) { |
---|
405 | dst_buffer = (*srcinfo->mem->access_virt_barray) |
---|
406 | ((j_common_ptr) srcinfo, dst_coef_arrays[ci], dst_blk_y, |
---|
407 | (JDIMENSION) compptr->v_samp_factor, TRUE); |
---|
408 | for (offset_y = 0; offset_y < compptr->v_samp_factor; offset_y++) { |
---|
409 | for (dst_blk_x = 0; dst_blk_x < compptr->width_in_blocks; |
---|
410 | dst_blk_x += compptr->h_samp_factor) { |
---|
411 | if (x_crop_blocks + dst_blk_x < comp_width) { |
---|
412 | /* Block is within the mirrorable area. */ |
---|
413 | src_buffer = (*srcinfo->mem->access_virt_barray) |
---|
414 | ((j_common_ptr) srcinfo, src_coef_arrays[ci], |
---|
415 | comp_width - x_crop_blocks - dst_blk_x - |
---|
416 | (JDIMENSION) compptr->h_samp_factor, |
---|
417 | (JDIMENSION) compptr->h_samp_factor, FALSE); |
---|
418 | } else { |
---|
419 | /* Edge blocks are transposed but not mirrored. */ |
---|
420 | src_buffer = (*srcinfo->mem->access_virt_barray) |
---|
421 | ((j_common_ptr) srcinfo, src_coef_arrays[ci], |
---|
422 | dst_blk_x + x_crop_blocks, |
---|
423 | (JDIMENSION) compptr->h_samp_factor, FALSE); |
---|
424 | } |
---|
425 | for (offset_x = 0; offset_x < compptr->h_samp_factor; offset_x++) { |
---|
426 | dst_ptr = dst_buffer[offset_y][dst_blk_x + offset_x]; |
---|
427 | if (x_crop_blocks + dst_blk_x < comp_width) { |
---|
428 | /* Block is within the mirrorable area. */ |
---|
429 | src_ptr = src_buffer[compptr->h_samp_factor - offset_x - 1] |
---|
430 | [dst_blk_y + offset_y + y_crop_blocks]; |
---|
431 | for (i = 0; i < DCTSIZE; i++) { |
---|
432 | for (j = 0; j < DCTSIZE; j++) |
---|
433 | dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j]; |
---|
434 | i++; |
---|
435 | for (j = 0; j < DCTSIZE; j++) |
---|
436 | dst_ptr[j*DCTSIZE+i] = -src_ptr[i*DCTSIZE+j]; |
---|
437 | } |
---|
438 | } else { |
---|
439 | /* Edge blocks are transposed but not mirrored. */ |
---|
440 | src_ptr = src_buffer[offset_x] |
---|
441 | [dst_blk_y + offset_y + y_crop_blocks]; |
---|
442 | for (i = 0; i < DCTSIZE; i++) |
---|
443 | for (j = 0; j < DCTSIZE; j++) |
---|
444 | dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j]; |
---|
445 | } |
---|
446 | } |
---|
447 | } |
---|
448 | } |
---|
449 | } |
---|
450 | } |
---|
451 | } |
---|
452 | |
---|
453 | |
---|
454 | LOCAL(void) |
---|
455 | do_rot_270 (j_decompress_ptr srcinfo, j_compress_ptr dstinfo, |
---|
456 | JDIMENSION x_crop_offset, JDIMENSION y_crop_offset, |
---|
457 | jvirt_barray_ptr *src_coef_arrays, |
---|
458 | jvirt_barray_ptr *dst_coef_arrays) |
---|
459 | /* 270 degree rotation is equivalent to |
---|
460 | * 1. Horizontal mirroring; |
---|
461 | * 2. Transposing the image. |
---|
462 | * These two steps are merged into a single processing routine. |
---|
463 | */ |
---|
464 | { |
---|
465 | JDIMENSION MCU_rows, comp_height, dst_blk_x, dst_blk_y; |
---|
466 | JDIMENSION x_crop_blocks, y_crop_blocks; |
---|
467 | int ci, i, j, offset_x, offset_y; |
---|
468 | JBLOCKARRAY src_buffer, dst_buffer; |
---|
469 | JCOEFPTR src_ptr, dst_ptr; |
---|
470 | jpeg_component_info *compptr; |
---|
471 | |
---|
472 | /* Because of the horizontal mirror step, we can't process partial iMCUs |
---|
473 | * at the (output) bottom edge properly. They just get transposed and |
---|
474 | * not mirrored. |
---|
475 | */ |
---|
476 | MCU_rows = srcinfo->output_width / |
---|
477 | (dstinfo->max_v_samp_factor * dstinfo->min_DCT_v_scaled_size); |
---|
478 | |
---|
479 | for (ci = 0; ci < dstinfo->num_components; ci++) { |
---|
480 | compptr = dstinfo->comp_info + ci; |
---|
481 | comp_height = MCU_rows * compptr->v_samp_factor; |
---|
482 | x_crop_blocks = x_crop_offset * compptr->h_samp_factor; |
---|
483 | y_crop_blocks = y_crop_offset * compptr->v_samp_factor; |
---|
484 | for (dst_blk_y = 0; dst_blk_y < compptr->height_in_blocks; |
---|
485 | dst_blk_y += compptr->v_samp_factor) { |
---|
486 | dst_buffer = (*srcinfo->mem->access_virt_barray) |
---|
487 | ((j_common_ptr) srcinfo, dst_coef_arrays[ci], dst_blk_y, |
---|
488 | (JDIMENSION) compptr->v_samp_factor, TRUE); |
---|
489 | for (offset_y = 0; offset_y < compptr->v_samp_factor; offset_y++) { |
---|
490 | for (dst_blk_x = 0; dst_blk_x < compptr->width_in_blocks; |
---|
491 | dst_blk_x += compptr->h_samp_factor) { |
---|
492 | src_buffer = (*srcinfo->mem->access_virt_barray) |
---|
493 | ((j_common_ptr) srcinfo, src_coef_arrays[ci], |
---|
494 | dst_blk_x + x_crop_blocks, |
---|
495 | (JDIMENSION) compptr->h_samp_factor, FALSE); |
---|
496 | for (offset_x = 0; offset_x < compptr->h_samp_factor; offset_x++) { |
---|
497 | dst_ptr = dst_buffer[offset_y][dst_blk_x + offset_x]; |
---|
498 | if (y_crop_blocks + dst_blk_y < comp_height) { |
---|
499 | /* Block is within the mirrorable area. */ |
---|
500 | src_ptr = src_buffer[offset_x] |
---|
501 | [comp_height - y_crop_blocks - dst_blk_y - offset_y - 1]; |
---|
502 | for (i = 0; i < DCTSIZE; i++) { |
---|
503 | for (j = 0; j < DCTSIZE; j++) { |
---|
504 | dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j]; |
---|
505 | j++; |
---|
506 | dst_ptr[j*DCTSIZE+i] = -src_ptr[i*DCTSIZE+j]; |
---|
507 | } |
---|
508 | } |
---|
509 | } else { |
---|
510 | /* Edge blocks are transposed but not mirrored. */ |
---|
511 | src_ptr = src_buffer[offset_x] |
---|
512 | [dst_blk_y + offset_y + y_crop_blocks]; |
---|
513 | for (i = 0; i < DCTSIZE; i++) |
---|
514 | for (j = 0; j < DCTSIZE; j++) |
---|
515 | dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j]; |
---|
516 | } |
---|
517 | } |
---|
518 | } |
---|
519 | } |
---|
520 | } |
---|
521 | } |
---|
522 | } |
---|
523 | |
---|
524 | |
---|
525 | LOCAL(void) |
---|
526 | do_rot_180 (j_decompress_ptr srcinfo, j_compress_ptr dstinfo, |
---|
527 | JDIMENSION x_crop_offset, JDIMENSION y_crop_offset, |
---|
528 | jvirt_barray_ptr *src_coef_arrays, |
---|
529 | jvirt_barray_ptr *dst_coef_arrays) |
---|
530 | /* 180 degree rotation is equivalent to |
---|
531 | * 1. Vertical mirroring; |
---|
532 | * 2. Horizontal mirroring. |
---|
533 | * These two steps are merged into a single processing routine. |
---|
534 | */ |
---|
535 | { |
---|
536 | JDIMENSION MCU_cols, MCU_rows, comp_width, comp_height, dst_blk_x, dst_blk_y; |
---|
537 | JDIMENSION x_crop_blocks, y_crop_blocks; |
---|
538 | int ci, i, j, offset_y; |
---|
539 | JBLOCKARRAY src_buffer, dst_buffer; |
---|
540 | JBLOCKROW src_row_ptr, dst_row_ptr; |
---|
541 | JCOEFPTR src_ptr, dst_ptr; |
---|
542 | jpeg_component_info *compptr; |
---|
543 | |
---|
544 | MCU_cols = srcinfo->output_width / |
---|
545 | (dstinfo->max_h_samp_factor * dstinfo->min_DCT_h_scaled_size); |
---|
546 | MCU_rows = srcinfo->output_height / |
---|
547 | (dstinfo->max_v_samp_factor * dstinfo->min_DCT_v_scaled_size); |
---|
548 | |
---|
549 | for (ci = 0; ci < dstinfo->num_components; ci++) { |
---|
550 | compptr = dstinfo->comp_info + ci; |
---|
551 | comp_width = MCU_cols * compptr->h_samp_factor; |
---|
552 | comp_height = MCU_rows * compptr->v_samp_factor; |
---|
553 | x_crop_blocks = x_crop_offset * compptr->h_samp_factor; |
---|
554 | y_crop_blocks = y_crop_offset * compptr->v_samp_factor; |
---|
555 | for (dst_blk_y = 0; dst_blk_y < compptr->height_in_blocks; |
---|
556 | dst_blk_y += compptr->v_samp_factor) { |
---|
557 | dst_buffer = (*srcinfo->mem->access_virt_barray) |
---|
558 | ((j_common_ptr) srcinfo, dst_coef_arrays[ci], dst_blk_y, |
---|
559 | (JDIMENSION) compptr->v_samp_factor, TRUE); |
---|
560 | if (y_crop_blocks + dst_blk_y < comp_height) { |
---|
561 | /* Row is within the vertically mirrorable area. */ |
---|
562 | src_buffer = (*srcinfo->mem->access_virt_barray) |
---|
563 | ((j_common_ptr) srcinfo, src_coef_arrays[ci], |
---|
564 | comp_height - y_crop_blocks - dst_blk_y - |
---|
565 | (JDIMENSION) compptr->v_samp_factor, |
---|
566 | (JDIMENSION) compptr->v_samp_factor, FALSE); |
---|
567 | } else { |
---|
568 | /* Bottom-edge rows are only mirrored horizontally. */ |
---|
569 | src_buffer = (*srcinfo->mem->access_virt_barray) |
---|
570 | ((j_common_ptr) srcinfo, src_coef_arrays[ci], |
---|
571 | dst_blk_y + y_crop_blocks, |
---|
572 | (JDIMENSION) compptr->v_samp_factor, FALSE); |
---|
573 | } |
---|
574 | for (offset_y = 0; offset_y < compptr->v_samp_factor; offset_y++) { |
---|
575 | dst_row_ptr = dst_buffer[offset_y]; |
---|
576 | if (y_crop_blocks + dst_blk_y < comp_height) { |
---|
577 | /* Row is within the mirrorable area. */ |
---|
578 | src_row_ptr = src_buffer[compptr->v_samp_factor - offset_y - 1]; |
---|
579 | for (dst_blk_x = 0; dst_blk_x < compptr->width_in_blocks; dst_blk_x++) { |
---|
580 | dst_ptr = dst_row_ptr[dst_blk_x]; |
---|
581 | if (x_crop_blocks + dst_blk_x < comp_width) { |
---|
582 | /* Process the blocks that can be mirrored both ways. */ |
---|
583 | src_ptr = src_row_ptr[comp_width - x_crop_blocks - dst_blk_x - 1]; |
---|
584 | for (i = 0; i < DCTSIZE; i += 2) { |
---|
585 | /* For even row, negate every odd column. */ |
---|
586 | for (j = 0; j < DCTSIZE; j += 2) { |
---|
587 | *dst_ptr++ = *src_ptr++; |
---|
588 | *dst_ptr++ = - *src_ptr++; |
---|
589 | } |
---|
590 | /* For odd row, negate every even column. */ |
---|
591 | for (j = 0; j < DCTSIZE; j += 2) { |
---|
592 | *dst_ptr++ = - *src_ptr++; |
---|
593 | *dst_ptr++ = *src_ptr++; |
---|
594 | } |
---|
595 | } |
---|
596 | } else { |
---|
597 | /* Any remaining right-edge blocks are only mirrored vertically. */ |
---|
598 | src_ptr = src_row_ptr[x_crop_blocks + dst_blk_x]; |
---|
599 | for (i = 0; i < DCTSIZE; i += 2) { |
---|
600 | for (j = 0; j < DCTSIZE; j++) |
---|
601 | *dst_ptr++ = *src_ptr++; |
---|
602 | for (j = 0; j < DCTSIZE; j++) |
---|
603 | *dst_ptr++ = - *src_ptr++; |
---|
604 | } |
---|
605 | } |
---|
606 | } |
---|
607 | } else { |
---|
608 | /* Remaining rows are just mirrored horizontally. */ |
---|
609 | src_row_ptr = src_buffer[offset_y]; |
---|
610 | for (dst_blk_x = 0; dst_blk_x < compptr->width_in_blocks; dst_blk_x++) { |
---|
611 | if (x_crop_blocks + dst_blk_x < comp_width) { |
---|
612 | /* Process the blocks that can be mirrored. */ |
---|
613 | dst_ptr = dst_row_ptr[dst_blk_x]; |
---|
614 | src_ptr = src_row_ptr[comp_width - x_crop_blocks - dst_blk_x - 1]; |
---|
615 | for (i = 0; i < DCTSIZE2; i += 2) { |
---|
616 | *dst_ptr++ = *src_ptr++; |
---|
617 | *dst_ptr++ = - *src_ptr++; |
---|
618 | } |
---|
619 | } else { |
---|
620 | /* Any remaining right-edge blocks are only copied. */ |
---|
621 | jcopy_block_row(src_row_ptr + dst_blk_x + x_crop_blocks, |
---|
622 | dst_row_ptr + dst_blk_x, |
---|
623 | (JDIMENSION) 1); |
---|
624 | } |
---|
625 | } |
---|
626 | } |
---|
627 | } |
---|
628 | } |
---|
629 | } |
---|
630 | } |
---|
631 | |
---|
632 | |
---|
633 | LOCAL(void) |
---|
634 | do_transverse (j_decompress_ptr srcinfo, j_compress_ptr dstinfo, |
---|
635 | JDIMENSION x_crop_offset, JDIMENSION y_crop_offset, |
---|
636 | jvirt_barray_ptr *src_coef_arrays, |
---|
637 | jvirt_barray_ptr *dst_coef_arrays) |
---|
638 | /* Transverse transpose is equivalent to |
---|
639 | * 1. 180 degree rotation; |
---|
640 | * 2. Transposition; |
---|
641 | * or |
---|
642 | * 1. Horizontal mirroring; |
---|
643 | * 2. Transposition; |
---|
644 | * 3. Horizontal mirroring. |
---|
645 | * These steps are merged into a single processing routine. |
---|
646 | */ |
---|
647 | { |
---|
648 | JDIMENSION MCU_cols, MCU_rows, comp_width, comp_height, dst_blk_x, dst_blk_y; |
---|
649 | JDIMENSION x_crop_blocks, y_crop_blocks; |
---|
650 | int ci, i, j, offset_x, offset_y; |
---|
651 | JBLOCKARRAY src_buffer, dst_buffer; |
---|
652 | JCOEFPTR src_ptr, dst_ptr; |
---|
653 | jpeg_component_info *compptr; |
---|
654 | |
---|
655 | MCU_cols = srcinfo->output_height / |
---|
656 | (dstinfo->max_h_samp_factor * dstinfo->min_DCT_h_scaled_size); |
---|
657 | MCU_rows = srcinfo->output_width / |
---|
658 | (dstinfo->max_v_samp_factor * dstinfo->min_DCT_v_scaled_size); |
---|
659 | |
---|
660 | for (ci = 0; ci < dstinfo->num_components; ci++) { |
---|
661 | compptr = dstinfo->comp_info + ci; |
---|
662 | comp_width = MCU_cols * compptr->h_samp_factor; |
---|
663 | comp_height = MCU_rows * compptr->v_samp_factor; |
---|
664 | x_crop_blocks = x_crop_offset * compptr->h_samp_factor; |
---|
665 | y_crop_blocks = y_crop_offset * compptr->v_samp_factor; |
---|
666 | for (dst_blk_y = 0; dst_blk_y < compptr->height_in_blocks; |
---|
667 | dst_blk_y += compptr->v_samp_factor) { |
---|
668 | dst_buffer = (*srcinfo->mem->access_virt_barray) |
---|
669 | ((j_common_ptr) srcinfo, dst_coef_arrays[ci], dst_blk_y, |
---|
670 | (JDIMENSION) compptr->v_samp_factor, TRUE); |
---|
671 | for (offset_y = 0; offset_y < compptr->v_samp_factor; offset_y++) { |
---|
672 | for (dst_blk_x = 0; dst_blk_x < compptr->width_in_blocks; |
---|
673 | dst_blk_x += compptr->h_samp_factor) { |
---|
674 | if (x_crop_blocks + dst_blk_x < comp_width) { |
---|
675 | /* Block is within the mirrorable area. */ |
---|
676 | src_buffer = (*srcinfo->mem->access_virt_barray) |
---|
677 | ((j_common_ptr) srcinfo, src_coef_arrays[ci], |
---|
678 | comp_width - x_crop_blocks - dst_blk_x - |
---|
679 | (JDIMENSION) compptr->h_samp_factor, |
---|
680 | (JDIMENSION) compptr->h_samp_factor, FALSE); |
---|
681 | } else { |
---|
682 | src_buffer = (*srcinfo->mem->access_virt_barray) |
---|
683 | ((j_common_ptr) srcinfo, src_coef_arrays[ci], |
---|
684 | dst_blk_x + x_crop_blocks, |
---|
685 | (JDIMENSION) compptr->h_samp_factor, FALSE); |
---|
686 | } |
---|
687 | for (offset_x = 0; offset_x < compptr->h_samp_factor; offset_x++) { |
---|
688 | dst_ptr = dst_buffer[offset_y][dst_blk_x + offset_x]; |
---|
689 | if (y_crop_blocks + dst_blk_y < comp_height) { |
---|
690 | if (x_crop_blocks + dst_blk_x < comp_width) { |
---|
691 | /* Block is within the mirrorable area. */ |
---|
692 | src_ptr = src_buffer[compptr->h_samp_factor - offset_x - 1] |
---|
693 | [comp_height - y_crop_blocks - dst_blk_y - offset_y - 1]; |
---|
694 | for (i = 0; i < DCTSIZE; i++) { |
---|
695 | for (j = 0; j < DCTSIZE; j++) { |
---|
696 | dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j]; |
---|
697 | j++; |
---|
698 | dst_ptr[j*DCTSIZE+i] = -src_ptr[i*DCTSIZE+j]; |
---|
699 | } |
---|
700 | i++; |
---|
701 | for (j = 0; j < DCTSIZE; j++) { |
---|
702 | dst_ptr[j*DCTSIZE+i] = -src_ptr[i*DCTSIZE+j]; |
---|
703 | j++; |
---|
704 | dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j]; |
---|
705 | } |
---|
706 | } |
---|
707 | } else { |
---|
708 | /* Right-edge blocks are mirrored in y only */ |
---|
709 | src_ptr = src_buffer[offset_x] |
---|
710 | [comp_height - y_crop_blocks - dst_blk_y - offset_y - 1]; |
---|
711 | for (i = 0; i < DCTSIZE; i++) { |
---|
712 | for (j = 0; j < DCTSIZE; j++) { |
---|
713 | dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j]; |
---|
714 | j++; |
---|
715 | dst_ptr[j*DCTSIZE+i] = -src_ptr[i*DCTSIZE+j]; |
---|
716 | } |
---|
717 | } |
---|
718 | } |
---|
719 | } else { |
---|
720 | if (x_crop_blocks + dst_blk_x < comp_width) { |
---|
721 | /* Bottom-edge blocks are mirrored in x only */ |
---|
722 | src_ptr = src_buffer[compptr->h_samp_factor - offset_x - 1] |
---|
723 | [dst_blk_y + offset_y + y_crop_blocks]; |
---|
724 | for (i = 0; i < DCTSIZE; i++) { |
---|
725 | for (j = 0; j < DCTSIZE; j++) |
---|
726 | dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j]; |
---|
727 | i++; |
---|
728 | for (j = 0; j < DCTSIZE; j++) |
---|
729 | dst_ptr[j*DCTSIZE+i] = -src_ptr[i*DCTSIZE+j]; |
---|
730 | } |
---|
731 | } else { |
---|
732 | /* At lower right corner, just transpose, no mirroring */ |
---|
733 | src_ptr = src_buffer[offset_x] |
---|
734 | [dst_blk_y + offset_y + y_crop_blocks]; |
---|
735 | for (i = 0; i < DCTSIZE; i++) |
---|
736 | for (j = 0; j < DCTSIZE; j++) |
---|
737 | dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j]; |
---|
738 | } |
---|
739 | } |
---|
740 | } |
---|
741 | } |
---|
742 | } |
---|
743 | } |
---|
744 | } |
---|
745 | } |
---|
746 | |
---|
747 | |
---|
748 | /* Parse an unsigned integer: subroutine for jtransform_parse_crop_spec. |
---|
749 | * Returns TRUE if valid integer found, FALSE if not. |
---|
750 | * *strptr is advanced over the digit string, and *result is set to its value. |
---|
751 | */ |
---|
752 | |
---|
753 | LOCAL(boolean) |
---|
754 | jt_read_integer (const char ** strptr, JDIMENSION * result) |
---|
755 | { |
---|
756 | const char * ptr = *strptr; |
---|
757 | JDIMENSION val = 0; |
---|
758 | |
---|
759 | for (; isdigit(*ptr); ptr++) { |
---|
760 | val = val * 10 + (JDIMENSION) (*ptr - '0'); |
---|
761 | } |
---|
762 | *result = val; |
---|
763 | if (ptr == *strptr) |
---|
764 | return FALSE; /* oops, no digits */ |
---|
765 | *strptr = ptr; |
---|
766 | return TRUE; |
---|
767 | } |
---|
768 | |
---|
769 | |
---|
770 | /* Parse a crop specification (written in X11 geometry style). |
---|
771 | * The routine returns TRUE if the spec string is valid, FALSE if not. |
---|
772 | * |
---|
773 | * The crop spec string should have the format |
---|
774 | * <width>[f]x<height>[f]{+-}<xoffset>{+-}<yoffset> |
---|
775 | * where width, height, xoffset, and yoffset are unsigned integers. |
---|
776 | * Each of the elements can be omitted to indicate a default value. |
---|
777 | * (A weakness of this style is that it is not possible to omit xoffset |
---|
778 | * while specifying yoffset, since they look alike.) |
---|
779 | * |
---|
780 | * This code is loosely based on XParseGeometry from the X11 distribution. |
---|
781 | */ |
---|
782 | |
---|
783 | GLOBAL(boolean) |
---|
784 | jtransform_parse_crop_spec (jpeg_transform_info *info, const char *spec) |
---|
785 | { |
---|
786 | info->crop = FALSE; |
---|
787 | info->crop_width_set = JCROP_UNSET; |
---|
788 | info->crop_height_set = JCROP_UNSET; |
---|
789 | info->crop_xoffset_set = JCROP_UNSET; |
---|
790 | info->crop_yoffset_set = JCROP_UNSET; |
---|
791 | |
---|
792 | if (isdigit(*spec)) { |
---|
793 | /* fetch width */ |
---|
794 | if (! jt_read_integer(&spec, &info->crop_width)) |
---|
795 | return FALSE; |
---|
796 | if (*spec == 'f' || *spec == 'F') { |
---|
797 | spec++; |
---|
798 | info->crop_width_set = JCROP_FORCE; |
---|
799 | } else |
---|
800 | info->crop_width_set = JCROP_POS; |
---|
801 | } |
---|
802 | if (*spec == 'x' || *spec == 'X') { |
---|
803 | /* fetch height */ |
---|
804 | spec++; |
---|
805 | if (! jt_read_integer(&spec, &info->crop_height)) |
---|
806 | return FALSE; |
---|
807 | if (*spec == 'f' || *spec == 'F') { |
---|
808 | spec++; |
---|
809 | info->crop_height_set = JCROP_FORCE; |
---|
810 | } else |
---|
811 | info->crop_height_set = JCROP_POS; |
---|
812 | } |
---|
813 | if (*spec == '+' || *spec == '-') { |
---|
814 | /* fetch xoffset */ |
---|
815 | info->crop_xoffset_set = (*spec == '-') ? JCROP_NEG : JCROP_POS; |
---|
816 | spec++; |
---|
817 | if (! jt_read_integer(&spec, &info->crop_xoffset)) |
---|
818 | return FALSE; |
---|
819 | } |
---|
820 | if (*spec == '+' || *spec == '-') { |
---|
821 | /* fetch yoffset */ |
---|
822 | info->crop_yoffset_set = (*spec == '-') ? JCROP_NEG : JCROP_POS; |
---|
823 | spec++; |
---|
824 | if (! jt_read_integer(&spec, &info->crop_yoffset)) |
---|
825 | return FALSE; |
---|
826 | } |
---|
827 | /* We had better have gotten to the end of the string. */ |
---|
828 | if (*spec != '\0') |
---|
829 | return FALSE; |
---|
830 | info->crop = TRUE; |
---|
831 | return TRUE; |
---|
832 | } |
---|
833 | |
---|
834 | |
---|
835 | /* Trim off any partial iMCUs on the indicated destination edge */ |
---|
836 | |
---|
837 | LOCAL(void) |
---|
838 | trim_right_edge (jpeg_transform_info *info, JDIMENSION full_width) |
---|
839 | { |
---|
840 | JDIMENSION MCU_cols; |
---|
841 | |
---|
842 | MCU_cols = info->output_width / info->iMCU_sample_width; |
---|
843 | if (MCU_cols > 0 && info->x_crop_offset + MCU_cols == |
---|
844 | full_width / info->iMCU_sample_width) |
---|
845 | info->output_width = MCU_cols * info->iMCU_sample_width; |
---|
846 | } |
---|
847 | |
---|
848 | LOCAL(void) |
---|
849 | trim_bottom_edge (jpeg_transform_info *info, JDIMENSION full_height) |
---|
850 | { |
---|
851 | JDIMENSION MCU_rows; |
---|
852 | |
---|
853 | MCU_rows = info->output_height / info->iMCU_sample_height; |
---|
854 | if (MCU_rows > 0 && info->y_crop_offset + MCU_rows == |
---|
855 | full_height / info->iMCU_sample_height) |
---|
856 | info->output_height = MCU_rows * info->iMCU_sample_height; |
---|
857 | } |
---|
858 | |
---|
859 | |
---|
860 | /* Request any required workspace. |
---|
861 | * |
---|
862 | * This routine figures out the size that the output image will be |
---|
863 | * (which implies that all the transform parameters must be set before |
---|
864 | * it is called). |
---|
865 | * |
---|
866 | * We allocate the workspace virtual arrays from the source decompression |
---|
867 | * object, so that all the arrays (both the original data and the workspace) |
---|
868 | * will be taken into account while making memory management decisions. |
---|
869 | * Hence, this routine must be called after jpeg_read_header (which reads |
---|
870 | * the image dimensions) and before jpeg_read_coefficients (which realizes |
---|
871 | * the source's virtual arrays). |
---|
872 | * |
---|
873 | * This function returns FALSE right away if -perfect is given |
---|
874 | * and transformation is not perfect. Otherwise returns TRUE. |
---|
875 | */ |
---|
876 | |
---|
877 | GLOBAL(boolean) |
---|
878 | jtransform_request_workspace (j_decompress_ptr srcinfo, |
---|
879 | jpeg_transform_info *info) |
---|
880 | { |
---|
881 | jvirt_barray_ptr *coef_arrays; |
---|
882 | boolean need_workspace, transpose_it; |
---|
883 | jpeg_component_info *compptr; |
---|
884 | JDIMENSION xoffset, yoffset; |
---|
885 | JDIMENSION width_in_iMCUs, height_in_iMCUs; |
---|
886 | JDIMENSION width_in_blocks, height_in_blocks; |
---|
887 | int ci, h_samp_factor, v_samp_factor; |
---|
888 | |
---|
889 | /* Determine number of components in output image */ |
---|
890 | if (info->force_grayscale && |
---|
891 | srcinfo->jpeg_color_space == JCS_YCbCr && |
---|
892 | srcinfo->num_components == 3) |
---|
893 | /* We'll only process the first component */ |
---|
894 | info->num_components = 1; |
---|
895 | else |
---|
896 | /* Process all the components */ |
---|
897 | info->num_components = srcinfo->num_components; |
---|
898 | |
---|
899 | /* Compute output image dimensions and related values. */ |
---|
900 | jpeg_core_output_dimensions(srcinfo); |
---|
901 | |
---|
902 | /* Return right away if -perfect is given and transformation is not perfect. |
---|
903 | */ |
---|
904 | if (info->perfect) { |
---|
905 | if (info->num_components == 1) { |
---|
906 | if (!jtransform_perfect_transform(srcinfo->output_width, |
---|
907 | srcinfo->output_height, |
---|
908 | srcinfo->min_DCT_h_scaled_size, |
---|
909 | srcinfo->min_DCT_v_scaled_size, |
---|
910 | info->transform)) |
---|
911 | return FALSE; |
---|
912 | } else { |
---|
913 | if (!jtransform_perfect_transform(srcinfo->output_width, |
---|
914 | srcinfo->output_height, |
---|
915 | srcinfo->max_h_samp_factor * srcinfo->min_DCT_h_scaled_size, |
---|
916 | srcinfo->max_v_samp_factor * srcinfo->min_DCT_v_scaled_size, |
---|
917 | info->transform)) |
---|
918 | return FALSE; |
---|
919 | } |
---|
920 | } |
---|
921 | |
---|
922 | /* If there is only one output component, force the iMCU size to be 1; |
---|
923 | * else use the source iMCU size. (This allows us to do the right thing |
---|
924 | * when reducing color to grayscale, and also provides a handy way of |
---|
925 | * cleaning up "funny" grayscale images whose sampling factors are not 1x1.) |
---|
926 | */ |
---|
927 | switch (info->transform) { |
---|
928 | case JXFORM_TRANSPOSE: |
---|
929 | case JXFORM_TRANSVERSE: |
---|
930 | case JXFORM_ROT_90: |
---|
931 | case JXFORM_ROT_270: |
---|
932 | info->output_width = srcinfo->output_height; |
---|
933 | info->output_height = srcinfo->output_width; |
---|
934 | if (info->num_components == 1) { |
---|
935 | info->iMCU_sample_width = srcinfo->min_DCT_v_scaled_size; |
---|
936 | info->iMCU_sample_height = srcinfo->min_DCT_h_scaled_size; |
---|
937 | } else { |
---|
938 | info->iMCU_sample_width = |
---|
939 | srcinfo->max_v_samp_factor * srcinfo->min_DCT_v_scaled_size; |
---|
940 | info->iMCU_sample_height = |
---|
941 | srcinfo->max_h_samp_factor * srcinfo->min_DCT_h_scaled_size; |
---|
942 | } |
---|
943 | break; |
---|
944 | default: |
---|
945 | info->output_width = srcinfo->output_width; |
---|
946 | info->output_height = srcinfo->output_height; |
---|
947 | if (info->num_components == 1) { |
---|
948 | info->iMCU_sample_width = srcinfo->min_DCT_h_scaled_size; |
---|
949 | info->iMCU_sample_height = srcinfo->min_DCT_v_scaled_size; |
---|
950 | } else { |
---|
951 | info->iMCU_sample_width = |
---|
952 | srcinfo->max_h_samp_factor * srcinfo->min_DCT_h_scaled_size; |
---|
953 | info->iMCU_sample_height = |
---|
954 | srcinfo->max_v_samp_factor * srcinfo->min_DCT_v_scaled_size; |
---|
955 | } |
---|
956 | break; |
---|
957 | } |
---|
958 | |
---|
959 | /* If cropping has been requested, compute the crop area's position and |
---|
960 | * dimensions, ensuring that its upper left corner falls at an iMCU boundary. |
---|
961 | */ |
---|
962 | if (info->crop) { |
---|
963 | /* Insert default values for unset crop parameters */ |
---|
964 | if (info->crop_xoffset_set == JCROP_UNSET) |
---|
965 | info->crop_xoffset = 0; /* default to +0 */ |
---|
966 | if (info->crop_yoffset_set == JCROP_UNSET) |
---|
967 | info->crop_yoffset = 0; /* default to +0 */ |
---|
968 | if (info->crop_xoffset >= info->output_width || |
---|
969 | info->crop_yoffset >= info->output_height) |
---|
970 | ERREXIT(srcinfo, JERR_BAD_CROP_SPEC); |
---|
971 | if (info->crop_width_set == JCROP_UNSET) |
---|
972 | info->crop_width = info->output_width - info->crop_xoffset; |
---|
973 | if (info->crop_height_set == JCROP_UNSET) |
---|
974 | info->crop_height = info->output_height - info->crop_yoffset; |
---|
975 | /* Ensure parameters are valid */ |
---|
976 | if (info->crop_width <= 0 || info->crop_width > info->output_width || |
---|
977 | info->crop_height <= 0 || info->crop_height > info->output_height || |
---|
978 | info->crop_xoffset > info->output_width - info->crop_width || |
---|
979 | info->crop_yoffset > info->output_height - info->crop_height) |
---|
980 | ERREXIT(srcinfo, JERR_BAD_CROP_SPEC); |
---|
981 | /* Convert negative crop offsets into regular offsets */ |
---|
982 | if (info->crop_xoffset_set == JCROP_NEG) |
---|
983 | xoffset = info->output_width - info->crop_width - info->crop_xoffset; |
---|
984 | else |
---|
985 | xoffset = info->crop_xoffset; |
---|
986 | if (info->crop_yoffset_set == JCROP_NEG) |
---|
987 | yoffset = info->output_height - info->crop_height - info->crop_yoffset; |
---|
988 | else |
---|
989 | yoffset = info->crop_yoffset; |
---|
990 | /* Now adjust so that upper left corner falls at an iMCU boundary */ |
---|
991 | if (info->crop_width_set == JCROP_FORCE) |
---|
992 | info->output_width = info->crop_width; |
---|
993 | else |
---|
994 | info->output_width = |
---|
995 | info->crop_width + (xoffset % info->iMCU_sample_width); |
---|
996 | if (info->crop_height_set == JCROP_FORCE) |
---|
997 | info->output_height = info->crop_height; |
---|
998 | else |
---|
999 | info->output_height = |
---|
1000 | info->crop_height + (yoffset % info->iMCU_sample_height); |
---|
1001 | /* Save x/y offsets measured in iMCUs */ |
---|
1002 | info->x_crop_offset = xoffset / info->iMCU_sample_width; |
---|
1003 | info->y_crop_offset = yoffset / info->iMCU_sample_height; |
---|
1004 | } else { |
---|
1005 | info->x_crop_offset = 0; |
---|
1006 | info->y_crop_offset = 0; |
---|
1007 | } |
---|
1008 | |
---|
1009 | /* Figure out whether we need workspace arrays, |
---|
1010 | * and if so whether they are transposed relative to the source. |
---|
1011 | */ |
---|
1012 | need_workspace = FALSE; |
---|
1013 | transpose_it = FALSE; |
---|
1014 | switch (info->transform) { |
---|
1015 | case JXFORM_NONE: |
---|
1016 | if (info->x_crop_offset != 0 || info->y_crop_offset != 0) |
---|
1017 | need_workspace = TRUE; |
---|
1018 | /* No workspace needed if neither cropping nor transforming */ |
---|
1019 | break; |
---|
1020 | case JXFORM_FLIP_H: |
---|
1021 | if (info->trim) |
---|
1022 | trim_right_edge(info, srcinfo->output_width); |
---|
1023 | if (info->y_crop_offset != 0) |
---|
1024 | need_workspace = TRUE; |
---|
1025 | /* do_flip_h_no_crop doesn't need a workspace array */ |
---|
1026 | break; |
---|
1027 | case JXFORM_FLIP_V: |
---|
1028 | if (info->trim) |
---|
1029 | trim_bottom_edge(info, srcinfo->output_height); |
---|
1030 | /* Need workspace arrays having same dimensions as source image. */ |
---|
1031 | need_workspace = TRUE; |
---|
1032 | break; |
---|
1033 | case JXFORM_TRANSPOSE: |
---|
1034 | /* transpose does NOT have to trim anything */ |
---|
1035 | /* Need workspace arrays having transposed dimensions. */ |
---|
1036 | need_workspace = TRUE; |
---|
1037 | transpose_it = TRUE; |
---|
1038 | break; |
---|
1039 | case JXFORM_TRANSVERSE: |
---|
1040 | if (info->trim) { |
---|
1041 | trim_right_edge(info, srcinfo->output_height); |
---|
1042 | trim_bottom_edge(info, srcinfo->output_width); |
---|
1043 | } |
---|
1044 | /* Need workspace arrays having transposed dimensions. */ |
---|
1045 | need_workspace = TRUE; |
---|
1046 | transpose_it = TRUE; |
---|
1047 | break; |
---|
1048 | case JXFORM_ROT_90: |
---|
1049 | if (info->trim) |
---|
1050 | trim_right_edge(info, srcinfo->output_height); |
---|
1051 | /* Need workspace arrays having transposed dimensions. */ |
---|
1052 | need_workspace = TRUE; |
---|
1053 | transpose_it = TRUE; |
---|
1054 | break; |
---|
1055 | case JXFORM_ROT_180: |
---|
1056 | if (info->trim) { |
---|
1057 | trim_right_edge(info, srcinfo->output_width); |
---|
1058 | trim_bottom_edge(info, srcinfo->output_height); |
---|
1059 | } |
---|
1060 | /* Need workspace arrays having same dimensions as source image. */ |
---|
1061 | need_workspace = TRUE; |
---|
1062 | break; |
---|
1063 | case JXFORM_ROT_270: |
---|
1064 | if (info->trim) |
---|
1065 | trim_bottom_edge(info, srcinfo->output_width); |
---|
1066 | /* Need workspace arrays having transposed dimensions. */ |
---|
1067 | need_workspace = TRUE; |
---|
1068 | transpose_it = TRUE; |
---|
1069 | break; |
---|
1070 | } |
---|
1071 | |
---|
1072 | /* Allocate workspace if needed. |
---|
1073 | * Note that we allocate arrays padded out to the next iMCU boundary, |
---|
1074 | * so that transform routines need not worry about missing edge blocks. |
---|
1075 | */ |
---|
1076 | if (need_workspace) { |
---|
1077 | coef_arrays = (jvirt_barray_ptr *) |
---|
1078 | (*srcinfo->mem->alloc_small) ((j_common_ptr) srcinfo, JPOOL_IMAGE, |
---|
1079 | SIZEOF(jvirt_barray_ptr) * info->num_components); |
---|
1080 | width_in_iMCUs = (JDIMENSION) |
---|
1081 | jdiv_round_up((long) info->output_width, |
---|
1082 | (long) info->iMCU_sample_width); |
---|
1083 | height_in_iMCUs = (JDIMENSION) |
---|
1084 | jdiv_round_up((long) info->output_height, |
---|
1085 | (long) info->iMCU_sample_height); |
---|
1086 | for (ci = 0; ci < info->num_components; ci++) { |
---|
1087 | compptr = srcinfo->comp_info + ci; |
---|
1088 | if (info->num_components == 1) { |
---|
1089 | /* we're going to force samp factors to 1x1 in this case */ |
---|
1090 | h_samp_factor = v_samp_factor = 1; |
---|
1091 | } else if (transpose_it) { |
---|
1092 | h_samp_factor = compptr->v_samp_factor; |
---|
1093 | v_samp_factor = compptr->h_samp_factor; |
---|
1094 | } else { |
---|
1095 | h_samp_factor = compptr->h_samp_factor; |
---|
1096 | v_samp_factor = compptr->v_samp_factor; |
---|
1097 | } |
---|
1098 | width_in_blocks = width_in_iMCUs * h_samp_factor; |
---|
1099 | height_in_blocks = height_in_iMCUs * v_samp_factor; |
---|
1100 | coef_arrays[ci] = (*srcinfo->mem->request_virt_barray) |
---|
1101 | ((j_common_ptr) srcinfo, JPOOL_IMAGE, FALSE, |
---|
1102 | width_in_blocks, height_in_blocks, (JDIMENSION) v_samp_factor); |
---|
1103 | } |
---|
1104 | info->workspace_coef_arrays = coef_arrays; |
---|
1105 | } else |
---|
1106 | info->workspace_coef_arrays = NULL; |
---|
1107 | |
---|
1108 | return TRUE; |
---|
1109 | } |
---|
1110 | |
---|
1111 | |
---|
1112 | /* Transpose destination image parameters */ |
---|
1113 | |
---|
1114 | LOCAL(void) |
---|
1115 | transpose_critical_parameters (j_compress_ptr dstinfo) |
---|
1116 | { |
---|
1117 | int tblno, i, j, ci, itemp; |
---|
1118 | jpeg_component_info *compptr; |
---|
1119 | JQUANT_TBL *qtblptr; |
---|
1120 | JDIMENSION jtemp; |
---|
1121 | UINT16 qtemp; |
---|
1122 | |
---|
1123 | /* Transpose image dimensions */ |
---|
1124 | jtemp = dstinfo->image_width; |
---|
1125 | dstinfo->image_width = dstinfo->image_height; |
---|
1126 | dstinfo->image_height = jtemp; |
---|
1127 | itemp = dstinfo->min_DCT_h_scaled_size; |
---|
1128 | dstinfo->min_DCT_h_scaled_size = dstinfo->min_DCT_v_scaled_size; |
---|
1129 | dstinfo->min_DCT_v_scaled_size = itemp; |
---|
1130 | |
---|
1131 | /* Transpose sampling factors */ |
---|
1132 | for (ci = 0; ci < dstinfo->num_components; ci++) { |
---|
1133 | compptr = dstinfo->comp_info + ci; |
---|
1134 | itemp = compptr->h_samp_factor; |
---|
1135 | compptr->h_samp_factor = compptr->v_samp_factor; |
---|
1136 | compptr->v_samp_factor = itemp; |
---|
1137 | } |
---|
1138 | |
---|
1139 | /* Transpose quantization tables */ |
---|
1140 | for (tblno = 0; tblno < NUM_QUANT_TBLS; tblno++) { |
---|
1141 | qtblptr = dstinfo->quant_tbl_ptrs[tblno]; |
---|
1142 | if (qtblptr != NULL) { |
---|
1143 | for (i = 0; i < DCTSIZE; i++) { |
---|
1144 | for (j = 0; j < i; j++) { |
---|
1145 | qtemp = qtblptr->quantval[i*DCTSIZE+j]; |
---|
1146 | qtblptr->quantval[i*DCTSIZE+j] = qtblptr->quantval[j*DCTSIZE+i]; |
---|
1147 | qtblptr->quantval[j*DCTSIZE+i] = qtemp; |
---|
1148 | } |
---|
1149 | } |
---|
1150 | } |
---|
1151 | } |
---|
1152 | } |
---|
1153 | |
---|
1154 | |
---|
1155 | /* Adjust Exif image parameters. |
---|
1156 | * |
---|
1157 | * We try to adjust the Tags ExifImageWidth and ExifImageHeight if possible. |
---|
1158 | */ |
---|
1159 | |
---|
1160 | LOCAL(void) |
---|
1161 | adjust_exif_parameters (JOCTET FAR * data, unsigned int length, |
---|
1162 | JDIMENSION new_width, JDIMENSION new_height) |
---|
1163 | { |
---|
1164 | boolean is_motorola; /* Flag for byte order */ |
---|
1165 | unsigned int number_of_tags, tagnum; |
---|
1166 | unsigned int firstoffset, offset; |
---|
1167 | JDIMENSION new_value; |
---|
1168 | |
---|
1169 | if (length < 12) return; /* Length of an IFD entry */ |
---|
1170 | |
---|
1171 | /* Discover byte order */ |
---|
1172 | if (GETJOCTET(data[0]) == 0x49 && GETJOCTET(data[1]) == 0x49) |
---|
1173 | is_motorola = FALSE; |
---|
1174 | else if (GETJOCTET(data[0]) == 0x4D && GETJOCTET(data[1]) == 0x4D) |
---|
1175 | is_motorola = TRUE; |
---|
1176 | else |
---|
1177 | return; |
---|
1178 | |
---|
1179 | /* Check Tag Mark */ |
---|
1180 | if (is_motorola) { |
---|
1181 | if (GETJOCTET(data[2]) != 0) return; |
---|
1182 | if (GETJOCTET(data[3]) != 0x2A) return; |
---|
1183 | } else { |
---|
1184 | if (GETJOCTET(data[3]) != 0) return; |
---|
1185 | if (GETJOCTET(data[2]) != 0x2A) return; |
---|
1186 | } |
---|
1187 | |
---|
1188 | /* Get first IFD offset (offset to IFD0) */ |
---|
1189 | if (is_motorola) { |
---|
1190 | if (GETJOCTET(data[4]) != 0) return; |
---|
1191 | if (GETJOCTET(data[5]) != 0) return; |
---|
1192 | firstoffset = GETJOCTET(data[6]); |
---|
1193 | firstoffset <<= 8; |
---|
1194 | firstoffset += GETJOCTET(data[7]); |
---|
1195 | } else { |
---|
1196 | if (GETJOCTET(data[7]) != 0) return; |
---|
1197 | if (GETJOCTET(data[6]) != 0) return; |
---|
1198 | firstoffset = GETJOCTET(data[5]); |
---|
1199 | firstoffset <<= 8; |
---|
1200 | firstoffset += GETJOCTET(data[4]); |
---|
1201 | } |
---|
1202 | if (firstoffset > length - 2) return; /* check end of data segment */ |
---|
1203 | |
---|
1204 | /* Get the number of directory entries contained in this IFD */ |
---|
1205 | if (is_motorola) { |
---|
1206 | number_of_tags = GETJOCTET(data[firstoffset]); |
---|
1207 | number_of_tags <<= 8; |
---|
1208 | number_of_tags += GETJOCTET(data[firstoffset+1]); |
---|
1209 | } else { |
---|
1210 | number_of_tags = GETJOCTET(data[firstoffset+1]); |
---|
1211 | number_of_tags <<= 8; |
---|
1212 | number_of_tags += GETJOCTET(data[firstoffset]); |
---|
1213 | } |
---|
1214 | if (number_of_tags == 0) return; |
---|
1215 | firstoffset += 2; |
---|
1216 | |
---|
1217 | /* Search for ExifSubIFD offset Tag in IFD0 */ |
---|
1218 | for (;;) { |
---|
1219 | if (firstoffset > length - 12) return; /* check end of data segment */ |
---|
1220 | /* Get Tag number */ |
---|
1221 | if (is_motorola) { |
---|
1222 | tagnum = GETJOCTET(data[firstoffset]); |
---|
1223 | tagnum <<= 8; |
---|
1224 | tagnum += GETJOCTET(data[firstoffset+1]); |
---|
1225 | } else { |
---|
1226 | tagnum = GETJOCTET(data[firstoffset+1]); |
---|
1227 | tagnum <<= 8; |
---|
1228 | tagnum += GETJOCTET(data[firstoffset]); |
---|
1229 | } |
---|
1230 | if (tagnum == 0x8769) break; /* found ExifSubIFD offset Tag */ |
---|
1231 | if (--number_of_tags == 0) return; |
---|
1232 | firstoffset += 12; |
---|
1233 | } |
---|
1234 | |
---|
1235 | /* Get the ExifSubIFD offset */ |
---|
1236 | if (is_motorola) { |
---|
1237 | if (GETJOCTET(data[firstoffset+8]) != 0) return; |
---|
1238 | if (GETJOCTET(data[firstoffset+9]) != 0) return; |
---|
1239 | offset = GETJOCTET(data[firstoffset+10]); |
---|
1240 | offset <<= 8; |
---|
1241 | offset += GETJOCTET(data[firstoffset+11]); |
---|
1242 | } else { |
---|
1243 | if (GETJOCTET(data[firstoffset+11]) != 0) return; |
---|
1244 | if (GETJOCTET(data[firstoffset+10]) != 0) return; |
---|
1245 | offset = GETJOCTET(data[firstoffset+9]); |
---|
1246 | offset <<= 8; |
---|
1247 | offset += GETJOCTET(data[firstoffset+8]); |
---|
1248 | } |
---|
1249 | if (offset > length - 2) return; /* check end of data segment */ |
---|
1250 | |
---|
1251 | /* Get the number of directory entries contained in this SubIFD */ |
---|
1252 | if (is_motorola) { |
---|
1253 | number_of_tags = GETJOCTET(data[offset]); |
---|
1254 | number_of_tags <<= 8; |
---|
1255 | number_of_tags += GETJOCTET(data[offset+1]); |
---|
1256 | } else { |
---|
1257 | number_of_tags = GETJOCTET(data[offset+1]); |
---|
1258 | number_of_tags <<= 8; |
---|
1259 | number_of_tags += GETJOCTET(data[offset]); |
---|
1260 | } |
---|
1261 | if (number_of_tags < 2) return; |
---|
1262 | offset += 2; |
---|
1263 | |
---|
1264 | /* Search for ExifImageWidth and ExifImageHeight Tags in this SubIFD */ |
---|
1265 | do { |
---|
1266 | if (offset > length - 12) return; /* check end of data segment */ |
---|
1267 | /* Get Tag number */ |
---|
1268 | if (is_motorola) { |
---|
1269 | tagnum = GETJOCTET(data[offset]); |
---|
1270 | tagnum <<= 8; |
---|
1271 | tagnum += GETJOCTET(data[offset+1]); |
---|
1272 | } else { |
---|
1273 | tagnum = GETJOCTET(data[offset+1]); |
---|
1274 | tagnum <<= 8; |
---|
1275 | tagnum += GETJOCTET(data[offset]); |
---|
1276 | } |
---|
1277 | if (tagnum == 0xA002 || tagnum == 0xA003) { |
---|
1278 | if (tagnum == 0xA002) |
---|
1279 | new_value = new_width; /* ExifImageWidth Tag */ |
---|
1280 | else |
---|
1281 | new_value = new_height; /* ExifImageHeight Tag */ |
---|
1282 | if (is_motorola) { |
---|
1283 | data[offset+2] = 0; /* Format = unsigned long (4 octets) */ |
---|
1284 | data[offset+3] = 4; |
---|
1285 | data[offset+4] = 0; /* Number Of Components = 1 */ |
---|
1286 | data[offset+5] = 0; |
---|
1287 | data[offset+6] = 0; |
---|
1288 | data[offset+7] = 1; |
---|
1289 | data[offset+8] = 0; |
---|
1290 | data[offset+9] = 0; |
---|
1291 | data[offset+10] = (JOCTET)((new_value >> 8) & 0xFF); |
---|
1292 | data[offset+11] = (JOCTET)(new_value & 0xFF); |
---|
1293 | } else { |
---|
1294 | data[offset+2] = 4; /* Format = unsigned long (4 octets) */ |
---|
1295 | data[offset+3] = 0; |
---|
1296 | data[offset+4] = 1; /* Number Of Components = 1 */ |
---|
1297 | data[offset+5] = 0; |
---|
1298 | data[offset+6] = 0; |
---|
1299 | data[offset+7] = 0; |
---|
1300 | data[offset+8] = (JOCTET)(new_value & 0xFF); |
---|
1301 | data[offset+9] = (JOCTET)((new_value >> 8) & 0xFF); |
---|
1302 | data[offset+10] = 0; |
---|
1303 | data[offset+11] = 0; |
---|
1304 | } |
---|
1305 | } |
---|
1306 | offset += 12; |
---|
1307 | } while (--number_of_tags); |
---|
1308 | } |
---|
1309 | |
---|
1310 | |
---|
1311 | /* Adjust output image parameters as needed. |
---|
1312 | * |
---|
1313 | * This must be called after jpeg_copy_critical_parameters() |
---|
1314 | * and before jpeg_write_coefficients(). |
---|
1315 | * |
---|
1316 | * The return value is the set of virtual coefficient arrays to be written |
---|
1317 | * (either the ones allocated by jtransform_request_workspace, or the |
---|
1318 | * original source data arrays). The caller will need to pass this value |
---|
1319 | * to jpeg_write_coefficients(). |
---|
1320 | */ |
---|
1321 | |
---|
1322 | GLOBAL(jvirt_barray_ptr *) |
---|
1323 | jtransform_adjust_parameters (j_decompress_ptr srcinfo, |
---|
1324 | j_compress_ptr dstinfo, |
---|
1325 | jvirt_barray_ptr *src_coef_arrays, |
---|
1326 | jpeg_transform_info *info) |
---|
1327 | { |
---|
1328 | /* If force-to-grayscale is requested, adjust destination parameters */ |
---|
1329 | if (info->force_grayscale) { |
---|
1330 | /* First, ensure we have YCbCr or grayscale data, and that the source's |
---|
1331 | * Y channel is full resolution. (No reasonable person would make Y |
---|
1332 | * be less than full resolution, so actually coping with that case |
---|
1333 | * isn't worth extra code space. But we check it to avoid crashing.) |
---|
1334 | */ |
---|
1335 | if (((dstinfo->jpeg_color_space == JCS_YCbCr && |
---|
1336 | dstinfo->num_components == 3) || |
---|
1337 | (dstinfo->jpeg_color_space == JCS_GRAYSCALE && |
---|
1338 | dstinfo->num_components == 1)) && |
---|
1339 | srcinfo->comp_info[0].h_samp_factor == srcinfo->max_h_samp_factor && |
---|
1340 | srcinfo->comp_info[0].v_samp_factor == srcinfo->max_v_samp_factor) { |
---|
1341 | /* We use jpeg_set_colorspace to make sure subsidiary settings get fixed |
---|
1342 | * properly. Among other things, it sets the target h_samp_factor & |
---|
1343 | * v_samp_factor to 1, which typically won't match the source. |
---|
1344 | * We have to preserve the source's quantization table number, however. |
---|
1345 | */ |
---|
1346 | int sv_quant_tbl_no = dstinfo->comp_info[0].quant_tbl_no; |
---|
1347 | jpeg_set_colorspace(dstinfo, JCS_GRAYSCALE); |
---|
1348 | dstinfo->comp_info[0].quant_tbl_no = sv_quant_tbl_no; |
---|
1349 | } else { |
---|
1350 | /* Sorry, can't do it */ |
---|
1351 | ERREXIT(dstinfo, JERR_CONVERSION_NOTIMPL); |
---|
1352 | } |
---|
1353 | } else if (info->num_components == 1) { |
---|
1354 | /* For a single-component source, we force the destination sampling factors |
---|
1355 | * to 1x1, with or without force_grayscale. This is useful because some |
---|
1356 | * decoders choke on grayscale images with other sampling factors. |
---|
1357 | */ |
---|
1358 | dstinfo->comp_info[0].h_samp_factor = 1; |
---|
1359 | dstinfo->comp_info[0].v_samp_factor = 1; |
---|
1360 | } |
---|
1361 | |
---|
1362 | /* Correct the destination's image dimensions as necessary |
---|
1363 | * for rotate/flip, resize, and crop operations. |
---|
1364 | */ |
---|
1365 | dstinfo->jpeg_width = info->output_width; |
---|
1366 | dstinfo->jpeg_height = info->output_height; |
---|
1367 | |
---|
1368 | /* Transpose destination image parameters */ |
---|
1369 | switch (info->transform) { |
---|
1370 | case JXFORM_TRANSPOSE: |
---|
1371 | case JXFORM_TRANSVERSE: |
---|
1372 | case JXFORM_ROT_90: |
---|
1373 | case JXFORM_ROT_270: |
---|
1374 | transpose_critical_parameters(dstinfo); |
---|
1375 | break; |
---|
1376 | default: |
---|
1377 | break; |
---|
1378 | } |
---|
1379 | |
---|
1380 | /* Adjust Exif properties */ |
---|
1381 | if (srcinfo->marker_list != NULL && |
---|
1382 | srcinfo->marker_list->marker == JPEG_APP0+1 && |
---|
1383 | srcinfo->marker_list->data_length >= 6 && |
---|
1384 | GETJOCTET(srcinfo->marker_list->data[0]) == 0x45 && |
---|
1385 | GETJOCTET(srcinfo->marker_list->data[1]) == 0x78 && |
---|
1386 | GETJOCTET(srcinfo->marker_list->data[2]) == 0x69 && |
---|
1387 | GETJOCTET(srcinfo->marker_list->data[3]) == 0x66 && |
---|
1388 | GETJOCTET(srcinfo->marker_list->data[4]) == 0 && |
---|
1389 | GETJOCTET(srcinfo->marker_list->data[5]) == 0) { |
---|
1390 | /* Suppress output of JFIF marker */ |
---|
1391 | dstinfo->write_JFIF_header = FALSE; |
---|
1392 | /* Adjust Exif image parameters */ |
---|
1393 | if (dstinfo->jpeg_width != srcinfo->image_width || |
---|
1394 | dstinfo->jpeg_height != srcinfo->image_height) |
---|
1395 | /* Align data segment to start of TIFF structure for parsing */ |
---|
1396 | adjust_exif_parameters(srcinfo->marker_list->data + 6, |
---|
1397 | srcinfo->marker_list->data_length - 6, |
---|
1398 | dstinfo->jpeg_width, dstinfo->jpeg_height); |
---|
1399 | } |
---|
1400 | |
---|
1401 | /* Return the appropriate output data set */ |
---|
1402 | if (info->workspace_coef_arrays != NULL) |
---|
1403 | return info->workspace_coef_arrays; |
---|
1404 | return src_coef_arrays; |
---|
1405 | } |
---|
1406 | |
---|
1407 | |
---|
1408 | /* Execute the actual transformation, if any. |
---|
1409 | * |
---|
1410 | * This must be called *after* jpeg_write_coefficients, because it depends |
---|
1411 | * on jpeg_write_coefficients to have computed subsidiary values such as |
---|
1412 | * the per-component width and height fields in the destination object. |
---|
1413 | * |
---|
1414 | * Note that some transformations will modify the source data arrays! |
---|
1415 | */ |
---|
1416 | |
---|
1417 | GLOBAL(void) |
---|
1418 | jtransform_execute_transform (j_decompress_ptr srcinfo, |
---|
1419 | j_compress_ptr dstinfo, |
---|
1420 | jvirt_barray_ptr *src_coef_arrays, |
---|
1421 | jpeg_transform_info *info) |
---|
1422 | { |
---|
1423 | jvirt_barray_ptr *dst_coef_arrays = info->workspace_coef_arrays; |
---|
1424 | |
---|
1425 | /* Note: conditions tested here should match those in switch statement |
---|
1426 | * in jtransform_request_workspace() |
---|
1427 | */ |
---|
1428 | switch (info->transform) { |
---|
1429 | case JXFORM_NONE: |
---|
1430 | if (info->x_crop_offset != 0 || info->y_crop_offset != 0) |
---|
1431 | do_crop(srcinfo, dstinfo, info->x_crop_offset, info->y_crop_offset, |
---|
1432 | src_coef_arrays, dst_coef_arrays); |
---|
1433 | break; |
---|
1434 | case JXFORM_FLIP_H: |
---|
1435 | if (info->y_crop_offset != 0) |
---|
1436 | do_flip_h(srcinfo, dstinfo, info->x_crop_offset, info->y_crop_offset, |
---|
1437 | src_coef_arrays, dst_coef_arrays); |
---|
1438 | else |
---|
1439 | do_flip_h_no_crop(srcinfo, dstinfo, info->x_crop_offset, |
---|
1440 | src_coef_arrays); |
---|
1441 | break; |
---|
1442 | case JXFORM_FLIP_V: |
---|
1443 | do_flip_v(srcinfo, dstinfo, info->x_crop_offset, info->y_crop_offset, |
---|
1444 | src_coef_arrays, dst_coef_arrays); |
---|
1445 | break; |
---|
1446 | case JXFORM_TRANSPOSE: |
---|
1447 | do_transpose(srcinfo, dstinfo, info->x_crop_offset, info->y_crop_offset, |
---|
1448 | src_coef_arrays, dst_coef_arrays); |
---|
1449 | break; |
---|
1450 | case JXFORM_TRANSVERSE: |
---|
1451 | do_transverse(srcinfo, dstinfo, info->x_crop_offset, info->y_crop_offset, |
---|
1452 | src_coef_arrays, dst_coef_arrays); |
---|
1453 | break; |
---|
1454 | case JXFORM_ROT_90: |
---|
1455 | do_rot_90(srcinfo, dstinfo, info->x_crop_offset, info->y_crop_offset, |
---|
1456 | src_coef_arrays, dst_coef_arrays); |
---|
1457 | break; |
---|
1458 | case JXFORM_ROT_180: |
---|
1459 | do_rot_180(srcinfo, dstinfo, info->x_crop_offset, info->y_crop_offset, |
---|
1460 | src_coef_arrays, dst_coef_arrays); |
---|
1461 | break; |
---|
1462 | case JXFORM_ROT_270: |
---|
1463 | do_rot_270(srcinfo, dstinfo, info->x_crop_offset, info->y_crop_offset, |
---|
1464 | src_coef_arrays, dst_coef_arrays); |
---|
1465 | break; |
---|
1466 | } |
---|
1467 | } |
---|
1468 | |
---|
1469 | /* jtransform_perfect_transform |
---|
1470 | * |
---|
1471 | * Determine whether lossless transformation is perfectly |
---|
1472 | * possible for a specified image and transformation. |
---|
1473 | * |
---|
1474 | * Inputs: |
---|
1475 | * image_width, image_height: source image dimensions. |
---|
1476 | * MCU_width, MCU_height: pixel dimensions of MCU. |
---|
1477 | * transform: transformation identifier. |
---|
1478 | * Parameter sources from initialized jpeg_struct |
---|
1479 | * (after reading source header): |
---|
1480 | * image_width = cinfo.image_width |
---|
1481 | * image_height = cinfo.image_height |
---|
1482 | * MCU_width = cinfo.max_h_samp_factor * cinfo.block_size |
---|
1483 | * MCU_height = cinfo.max_v_samp_factor * cinfo.block_size |
---|
1484 | * Result: |
---|
1485 | * TRUE = perfect transformation possible |
---|
1486 | * FALSE = perfect transformation not possible |
---|
1487 | * (may use custom action then) |
---|
1488 | */ |
---|
1489 | |
---|
1490 | GLOBAL(boolean) |
---|
1491 | jtransform_perfect_transform(JDIMENSION image_width, JDIMENSION image_height, |
---|
1492 | int MCU_width, int MCU_height, |
---|
1493 | JXFORM_CODE transform) |
---|
1494 | { |
---|
1495 | boolean result = TRUE; /* initialize TRUE */ |
---|
1496 | |
---|
1497 | switch (transform) { |
---|
1498 | case JXFORM_FLIP_H: |
---|
1499 | case JXFORM_ROT_270: |
---|
1500 | if (image_width % (JDIMENSION) MCU_width) |
---|
1501 | result = FALSE; |
---|
1502 | break; |
---|
1503 | case JXFORM_FLIP_V: |
---|
1504 | case JXFORM_ROT_90: |
---|
1505 | if (image_height % (JDIMENSION) MCU_height) |
---|
1506 | result = FALSE; |
---|
1507 | break; |
---|
1508 | case JXFORM_TRANSVERSE: |
---|
1509 | case JXFORM_ROT_180: |
---|
1510 | if (image_width % (JDIMENSION) MCU_width) |
---|
1511 | result = FALSE; |
---|
1512 | if (image_height % (JDIMENSION) MCU_height) |
---|
1513 | result = FALSE; |
---|
1514 | break; |
---|
1515 | default: |
---|
1516 | break; |
---|
1517 | } |
---|
1518 | |
---|
1519 | return result; |
---|
1520 | } |
---|
1521 | |
---|
1522 | #endif /* TRANSFORMS_SUPPORTED */ |
---|
1523 | |
---|
1524 | |
---|
1525 | /* Setup decompression object to save desired markers in memory. |
---|
1526 | * This must be called before jpeg_read_header() to have the desired effect. |
---|
1527 | */ |
---|
1528 | |
---|
1529 | GLOBAL(void) |
---|
1530 | jcopy_markers_setup (j_decompress_ptr srcinfo, JCOPY_OPTION option) |
---|
1531 | { |
---|
1532 | #ifdef SAVE_MARKERS_SUPPORTED |
---|
1533 | int m; |
---|
1534 | |
---|
1535 | /* Save comments except under NONE option */ |
---|
1536 | if (option != JCOPYOPT_NONE) { |
---|
1537 | jpeg_save_markers(srcinfo, JPEG_COM, 0xFFFF); |
---|
1538 | } |
---|
1539 | /* Save all types of APPn markers iff ALL option */ |
---|
1540 | if (option == JCOPYOPT_ALL) { |
---|
1541 | for (m = 0; m < 16; m++) |
---|
1542 | jpeg_save_markers(srcinfo, JPEG_APP0 + m, 0xFFFF); |
---|
1543 | } |
---|
1544 | #endif /* SAVE_MARKERS_SUPPORTED */ |
---|
1545 | } |
---|
1546 | |
---|
1547 | /* Copy markers saved in the given source object to the destination object. |
---|
1548 | * This should be called just after jpeg_start_compress() or |
---|
1549 | * jpeg_write_coefficients(). |
---|
1550 | * Note that those routines will have written the SOI, and also the |
---|
1551 | * JFIF APP0 or Adobe APP14 markers if selected. |
---|
1552 | */ |
---|
1553 | |
---|
1554 | GLOBAL(void) |
---|
1555 | jcopy_markers_execute (j_decompress_ptr srcinfo, j_compress_ptr dstinfo, |
---|
1556 | JCOPY_OPTION option) |
---|
1557 | { |
---|
1558 | jpeg_saved_marker_ptr marker; |
---|
1559 | |
---|
1560 | /* In the current implementation, we don't actually need to examine the |
---|
1561 | * option flag here; we just copy everything that got saved. |
---|
1562 | * But to avoid confusion, we do not output JFIF and Adobe APP14 markers |
---|
1563 | * if the encoder library already wrote one. |
---|
1564 | */ |
---|
1565 | for (marker = srcinfo->marker_list; marker != NULL; marker = marker->next) { |
---|
1566 | if (dstinfo->write_JFIF_header && |
---|
1567 | marker->marker == JPEG_APP0 && |
---|
1568 | marker->data_length >= 5 && |
---|
1569 | GETJOCTET(marker->data[0]) == 0x4A && |
---|
1570 | GETJOCTET(marker->data[1]) == 0x46 && |
---|
1571 | GETJOCTET(marker->data[2]) == 0x49 && |
---|
1572 | GETJOCTET(marker->data[3]) == 0x46 && |
---|
1573 | GETJOCTET(marker->data[4]) == 0) |
---|
1574 | continue; /* reject duplicate JFIF */ |
---|
1575 | if (dstinfo->write_Adobe_marker && |
---|
1576 | marker->marker == JPEG_APP0+14 && |
---|
1577 | marker->data_length >= 5 && |
---|
1578 | GETJOCTET(marker->data[0]) == 0x41 && |
---|
1579 | GETJOCTET(marker->data[1]) == 0x64 && |
---|
1580 | GETJOCTET(marker->data[2]) == 0x6F && |
---|
1581 | GETJOCTET(marker->data[3]) == 0x62 && |
---|
1582 | GETJOCTET(marker->data[4]) == 0x65) |
---|
1583 | continue; /* reject duplicate Adobe */ |
---|
1584 | #ifdef NEED_FAR_POINTERS |
---|
1585 | /* We could use jpeg_write_marker if the data weren't FAR... */ |
---|
1586 | { |
---|
1587 | unsigned int i; |
---|
1588 | jpeg_write_m_header(dstinfo, marker->marker, marker->data_length); |
---|
1589 | for (i = 0; i < marker->data_length; i++) |
---|
1590 | jpeg_write_m_byte(dstinfo, marker->data[i]); |
---|
1591 | } |
---|
1592 | #else |
---|
1593 | jpeg_write_marker(dstinfo, marker->marker, |
---|
1594 | marker->data, marker->data_length); |
---|
1595 | #endif |
---|
1596 | } |
---|
1597 | } |
---|