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annotate packages/services/gfx/mw/current/src/jpeg-6b/jcsample.c @ 3292:7f8e529b4d82 default tip

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Fix FREESCALE_EDMA_NBYTES_MLOFFYES_MLOFF() so it works with negative offsets.
author vae
date Wed, 29 Apr 2015 23:31:48 +0000
parents e0c0827131d1
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * jcsample.c
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3 *
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4 * Copyright (C) 1991-1996, Thomas G. Lane.
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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 downsampling routines.
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9 *
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10 * Downsampling input data is counted in "row groups". A row group
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11 * is defined to be max_v_samp_factor pixel rows of each component,
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12 * from which the downsampler produces v_samp_factor sample rows.
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13 * A single row group is processed in each call to the downsampler module.
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14 *
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15 * The downsampler is responsible for edge-expansion of its output data
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16 * to fill an integral number of DCT blocks horizontally. The source buffer
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17 * may be modified if it is helpful for this purpose (the source buffer is
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18 * allocated wide enough to correspond to the desired output width).
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19 * The caller (the prep controller) is responsible for vertical padding.
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20 *
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21 * The downsampler may request "context rows" by setting need_context_rows
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22 * during startup. In this case, the input arrays will contain at least
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23 * one row group's worth of pixels above and below the passed-in data;
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24 * the caller will create dummy rows at image top and bottom by replicating
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25 * the first or last real pixel row.
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26 *
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27 * An excellent reference for image resampling is
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28 * Digital Image Warping, George Wolberg, 1990.
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29 * Pub. by IEEE Computer Society Press, Los Alamitos, CA. ISBN 0-8186-8944-7.
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30 *
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31 * The downsampling algorithm used here is a simple average of the source
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32 * pixels covered by the output pixel. The hi-falutin sampling literature
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33 * refers to this as a "box filter". In general the characteristics of a box
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34 * filter are not very good, but for the specific cases we normally use (1:1
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35 * and 2:1 ratios) the box is equivalent to a "triangle filter" which is not
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36 * nearly so bad. If you intend to use other sampling ratios, you'd be well
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37 * advised to improve this code.
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38 *
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39 * A simple input-smoothing capability is provided. This is mainly intended
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40 * for cleaning up color-dithered GIF input files (if you find it inadequate,
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41 * we suggest using an external filtering program such as pnmconvol). When
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42 * enabled, each input pixel P is replaced by a weighted sum of itself and its
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43 * eight neighbors. P's weight is 1-8*SF and each neighbor's weight is SF,
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44 * where SF = (smoothing_factor / 1024).
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45 * Currently, smoothing is only supported for 2h2v sampling factors.
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46 */
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47
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48 #define JPEG_INTERNALS
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49 #include "jinclude.h"
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50 #include "jpeglib.h"
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51
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52
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53 /* Pointer to routine to downsample a single component */
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54 typedef JMETHOD(void, downsample1_ptr,
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55 (j_compress_ptr cinfo, jpeg_component_info * compptr,
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56 JSAMPARRAY input_data, JSAMPARRAY output_data));
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57
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58 /* Private subobject */
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59
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60 typedef struct {
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61 struct jpeg_downsampler pub; /* public fields */
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62
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63 /* Downsampling method pointers, one per component */
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64 downsample1_ptr methods[MAX_COMPONENTS];
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65 } my_downsampler;
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66
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67 typedef my_downsampler * my_downsample_ptr;
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68
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69
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70 /*
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71 * Initialize for a downsampling pass.
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72 */
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73
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74 METHODDEF(void)
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75 start_pass_downsample (j_compress_ptr cinfo)
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76 {
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77 /* no work for now */
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78 }
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79
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80
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81 /*
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82 * Expand a component horizontally from width input_cols to width output_cols,
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83 * by duplicating the rightmost samples.
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84 */
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85
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86 LOCAL(void)
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87 expand_right_edge (JSAMPARRAY image_data, int num_rows,
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88 JDIMENSION input_cols, JDIMENSION output_cols)
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89 {
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90 register JSAMPROW ptr;
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91 register JSAMPLE pixval;
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92 register int count;
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93 int row;
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94 int numcols = (int) (output_cols - input_cols);
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95
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96 if (numcols > 0) {
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97 for (row = 0; row < num_rows; row++) {
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98 ptr = image_data[row] + input_cols;
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99 pixval = ptr[-1]; /* don't need GETJSAMPLE() here */
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100 for (count = numcols; count > 0; count--)
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101 *ptr++ = pixval;
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102 }
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103 }
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104 }
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105
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106
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107 /*
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108 * Do downsampling for a whole row group (all components).
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109 *
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110 * In this version we simply downsample each component independently.
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111 */
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112
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113 METHODDEF(void)
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114 sep_downsample (j_compress_ptr cinfo,
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115 JSAMPIMAGE input_buf, JDIMENSION in_row_index,
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116 JSAMPIMAGE output_buf, JDIMENSION out_row_group_index)
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117 {
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118 my_downsample_ptr downsample = (my_downsample_ptr) cinfo->downsample;
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119 int ci;
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120 jpeg_component_info * compptr;
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121 JSAMPARRAY in_ptr, out_ptr;
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122
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123 for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
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124 ci++, compptr++) {
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125 in_ptr = input_buf[ci] + in_row_index;
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126 out_ptr = output_buf[ci] + (out_row_group_index * compptr->v_samp_factor);
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127 (*downsample->methods[ci]) (cinfo, compptr, in_ptr, out_ptr);
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128 }
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129 }
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130
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131
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132 /*
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133 * Downsample pixel values of a single component.
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134 * One row group is processed per call.
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135 * This version handles arbitrary integral sampling ratios, without smoothing.
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136 * Note that this version is not actually used for customary sampling ratios.
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137 */
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138
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139 METHODDEF(void)
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140 int_downsample (j_compress_ptr cinfo, jpeg_component_info * compptr,
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141 JSAMPARRAY input_data, JSAMPARRAY output_data)
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142 {
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143 int inrow, outrow, h_expand, v_expand, numpix, numpix2, h, v;
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144 JDIMENSION outcol, outcol_h; /* outcol_h == outcol*h_expand */
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145 JDIMENSION output_cols = compptr->width_in_blocks * DCTSIZE;
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146 JSAMPROW inptr, outptr;
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147 INT32 outvalue;
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148
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149 h_expand = cinfo->max_h_samp_factor / compptr->h_samp_factor;
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150 v_expand = cinfo->max_v_samp_factor / compptr->v_samp_factor;
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151 numpix = h_expand * v_expand;
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152 numpix2 = numpix/2;
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153
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154 /* Expand input data enough to let all the output samples be generated
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155 * by the standard loop. Special-casing padded output would be more
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156 * efficient.
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157 */
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158 expand_right_edge(input_data, cinfo->max_v_samp_factor,
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159 cinfo->image_width, output_cols * h_expand);
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160
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161 inrow = 0;
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162 for (outrow = 0; outrow < compptr->v_samp_factor; outrow++) {
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163 outptr = output_data[outrow];
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164 for (outcol = 0, outcol_h = 0; outcol < output_cols;
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165 outcol++, outcol_h += h_expand) {
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166 outvalue = 0;
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167 for (v = 0; v < v_expand; v++) {
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168 inptr = input_data[inrow+v] + outcol_h;
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169 for (h = 0; h < h_expand; h++) {
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170 outvalue += (INT32) GETJSAMPLE(*inptr++);
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171 }
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172 }
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173 *outptr++ = (JSAMPLE) ((outvalue + numpix2) / numpix);
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174 }
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175 inrow += v_expand;
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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 * Downsample pixel values of a single component.
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182 * This version handles the special case of a full-size component,
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183 * without smoothing.
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184 */
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185
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186 METHODDEF(void)
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187 fullsize_downsample (j_compress_ptr cinfo, jpeg_component_info * compptr,
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188 JSAMPARRAY input_data, JSAMPARRAY output_data)
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189 {
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190 /* Copy the data */
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191 jcopy_sample_rows(input_data, 0, output_data, 0,
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192 cinfo->max_v_samp_factor, cinfo->image_width);
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193 /* Edge-expand */
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194 expand_right_edge(output_data, cinfo->max_v_samp_factor,
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195 cinfo->image_width, compptr->width_in_blocks * DCTSIZE);
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196 }
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197
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198
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199 /*
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200 * Downsample pixel values of a single component.
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201 * This version handles the common case of 2:1 horizontal and 1:1 vertical,
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202 * without smoothing.
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203 *
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204 * A note about the "bias" calculations: when rounding fractional values to
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205 * integer, we do not want to always round 0.5 up to the next integer.
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206 * If we did that, we'd introduce a noticeable bias towards larger values.
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207 * Instead, this code is arranged so that 0.5 will be rounded up or down at
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208 * alternate pixel locations (a simple ordered dither pattern).
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209 */
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210
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211 METHODDEF(void)
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212 h2v1_downsample (j_compress_ptr cinfo, jpeg_component_info * compptr,
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213 JSAMPARRAY input_data, JSAMPARRAY output_data)
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214 {
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215 int outrow;
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216 JDIMENSION outcol;
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217 JDIMENSION output_cols = compptr->width_in_blocks * DCTSIZE;
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218 register JSAMPROW inptr, outptr;
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219 register int bias;
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220
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221 /* Expand input data enough to let all the output samples be generated
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222 * by the standard loop. Special-casing padded output would be more
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223 * efficient.
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224 */
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225 expand_right_edge(input_data, cinfo->max_v_samp_factor,
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226 cinfo->image_width, output_cols * 2);
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227
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228 for (outrow = 0; outrow < compptr->v_samp_factor; outrow++) {
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229 outptr = output_data[outrow];
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230 inptr = input_data[outrow];
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231 bias = 0; /* bias = 0,1,0,1,... for successive samples */
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232 for (outcol = 0; outcol < output_cols; outcol++) {
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233 *outptr++ = (JSAMPLE) ((GETJSAMPLE(*inptr) + GETJSAMPLE(inptr[1])
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234 + bias) >> 1);
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235 bias ^= 1; /* 0=>1, 1=>0 */
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236 inptr += 2;
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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 * Downsample pixel values of a single component.
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244 * This version handles the standard case of 2:1 horizontal and 2:1 vertical,
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245 * without smoothing.
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246 */
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247
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248 METHODDEF(void)
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249 h2v2_downsample (j_compress_ptr cinfo, jpeg_component_info * compptr,
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250 JSAMPARRAY input_data, JSAMPARRAY output_data)
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251 {
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252 int inrow, outrow;
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253 JDIMENSION outcol;
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254 JDIMENSION output_cols = compptr->width_in_blocks * DCTSIZE;
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255 register JSAMPROW inptr0, inptr1, outptr;
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256 register int bias;
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257
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258 /* Expand input data enough to let all the output samples be generated
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259 * by the standard loop. Special-casing padded output would be more
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260 * efficient.
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261 */
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262 expand_right_edge(input_data, cinfo->max_v_samp_factor,
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263 cinfo->image_width, output_cols * 2);
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264
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265 inrow = 0;
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266 for (outrow = 0; outrow < compptr->v_samp_factor; outrow++) {
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267 outptr = output_data[outrow];
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268 inptr0 = input_data[inrow];
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269 inptr1 = input_data[inrow+1];
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270 bias = 1; /* bias = 1,2,1,2,... for successive samples */
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271 for (outcol = 0; outcol < output_cols; outcol++) {
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272 *outptr++ = (JSAMPLE) ((GETJSAMPLE(*inptr0) + GETJSAMPLE(inptr0[1]) +
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273 GETJSAMPLE(*inptr1) + GETJSAMPLE(inptr1[1])
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274 + bias) >> 2);
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275 bias ^= 3; /* 1=>2, 2=>1 */
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276 inptr0 += 2; inptr1 += 2;
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277 }
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278 inrow += 2;
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279 }
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280 }
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281
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282
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283 #ifdef INPUT_SMOOTHING_SUPPORTED
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284
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285 /*
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286 * Downsample pixel values of a single component.
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287 * This version handles the standard case of 2:1 horizontal and 2:1 vertical,
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288 * with smoothing. One row of context is required.
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289 */
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290
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291 METHODDEF(void)
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292 h2v2_smooth_downsample (j_compress_ptr cinfo, jpeg_component_info * compptr,
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293 JSAMPARRAY input_data, JSAMPARRAY output_data)
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294 {
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295 int inrow, outrow;
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296 JDIMENSION colctr;
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297 JDIMENSION output_cols = compptr->width_in_blocks * DCTSIZE;
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298 register JSAMPROW inptr0, inptr1, above_ptr, below_ptr, outptr;
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299 INT32 membersum, neighsum, memberscale, neighscale;
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300
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301 /* Expand input data enough to let all the output samples be generated
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302 * by the standard loop. Special-casing padded output would be more
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303 * efficient.
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304 */
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305 expand_right_edge(input_data - 1, cinfo->max_v_samp_factor + 2,
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306 cinfo->image_width, output_cols * 2);
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307
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308 /* We don't bother to form the individual "smoothed" input pixel values;
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309 * we can directly compute the output which is the average of the four
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310 * smoothed values. Each of the four member pixels contributes a fraction
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311 * (1-8*SF) to its own smoothed image and a fraction SF to each of the three
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312 * other smoothed pixels, therefore a total fraction (1-5*SF)/4 to the final
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313 * output. The four corner-adjacent neighbor pixels contribute a fraction
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314 * SF to just one smoothed pixel, or SF/4 to the final output; while the
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315 * eight edge-adjacent neighbors contribute SF to each of two smoothed
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316 * pixels, or SF/2 overall. In order to use integer arithmetic, these
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317 * factors are scaled by 2^16 = 65536.
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318 * Also recall that SF = smoothing_factor / 1024.
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319 */
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320
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321 memberscale = 16384 - cinfo->smoothing_factor * 80; /* scaled (1-5*SF)/4 */
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322 neighscale = cinfo->smoothing_factor * 16; /* scaled SF/4 */
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323
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324 inrow = 0;
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325 for (outrow = 0; outrow < compptr->v_samp_factor; outrow++) {
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326 outptr = output_data[outrow];
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327 inptr0 = input_data[inrow];
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328 inptr1 = input_data[inrow+1];
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329 above_ptr = input_data[inrow-1];
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330 below_ptr = input_data[inrow+2];
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331
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332 /* Special case for first column: pretend column -1 is same as column 0 */
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333 membersum = GETJSAMPLE(*inptr0) + GETJSAMPLE(inptr0[1]) +
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334 GETJSAMPLE(*inptr1) + GETJSAMPLE(inptr1[1]);
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335 neighsum = GETJSAMPLE(*above_ptr) + GETJSAMPLE(above_ptr[1]) +
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336 GETJSAMPLE(*below_ptr) + GETJSAMPLE(below_ptr[1]) +
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337 GETJSAMPLE(*inptr0) + GETJSAMPLE(inptr0[2]) +
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338 GETJSAMPLE(*inptr1) + GETJSAMPLE(inptr1[2]);
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339 neighsum += neighsum;
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340 neighsum += GETJSAMPLE(*above_ptr) + GETJSAMPLE(above_ptr[2]) +
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341 GETJSAMPLE(*below_ptr) + GETJSAMPLE(below_ptr[2]);
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342 membersum = membersum * memberscale + neighsum * neighscale;
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343 *outptr++ = (JSAMPLE) ((membersum + 32768) >> 16);
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344 inptr0 += 2; inptr1 += 2; above_ptr += 2; below_ptr += 2;
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345
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346 for (colctr = output_cols - 2; colctr > 0; colctr--) {
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347 /* sum of pixels directly mapped to this output element */
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348 membersum = GETJSAMPLE(*inptr0) + GETJSAMPLE(inptr0[1]) +
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349 GETJSAMPLE(*inptr1) + GETJSAMPLE(inptr1[1]);
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350 /* sum of edge-neighbor pixels */
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351 neighsum = GETJSAMPLE(*above_ptr) + GETJSAMPLE(above_ptr[1]) +
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352 GETJSAMPLE(*below_ptr) + GETJSAMPLE(below_ptr[1]) +
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353 GETJSAMPLE(inptr0[-1]) + GETJSAMPLE(inptr0[2]) +
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354 GETJSAMPLE(inptr1[-1]) + GETJSAMPLE(inptr1[2]);
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355 /* The edge-neighbors count twice as much as corner-neighbors */
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356 neighsum += neighsum;
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357 /* Add in the corner-neighbors */
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358 neighsum += GETJSAMPLE(above_ptr[-1]) + GETJSAMPLE(above_ptr[2]) +
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359 GETJSAMPLE(below_ptr[-1]) + GETJSAMPLE(below_ptr[2]);
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360 /* form final output scaled up by 2^16 */
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361 membersum = membersum * memberscale + neighsum * neighscale;
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362 /* round, descale and output it */
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363 *outptr++ = (JSAMPLE) ((membersum + 32768) >> 16);
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364 inptr0 += 2; inptr1 += 2; above_ptr += 2; below_ptr += 2;
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365 }
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366
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367 /* Special case for last column */
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368 membersum = GETJSAMPLE(*inptr0) + GETJSAMPLE(inptr0[1]) +
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369 GETJSAMPLE(*inptr1) + GETJSAMPLE(inptr1[1]);
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370 neighsum = GETJSAMPLE(*above_ptr) + GETJSAMPLE(above_ptr[1]) +
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371 GETJSAMPLE(*below_ptr) + GETJSAMPLE(below_ptr[1]) +
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372 GETJSAMPLE(inptr0[-1]) + GETJSAMPLE(inptr0[1]) +
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373 GETJSAMPLE(inptr1[-1]) + GETJSAMPLE(inptr1[1]);
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374 neighsum += neighsum;
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375 neighsum += GETJSAMPLE(above_ptr[-1]) + GETJSAMPLE(above_ptr[1]) +
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376 GETJSAMPLE(below_ptr[-1]) + GETJSAMPLE(below_ptr[1]);
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377 membersum = membersum * memberscale + neighsum * neighscale;
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378 *outptr = (JSAMPLE) ((membersum + 32768) >> 16);
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379
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380 inrow += 2;
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381 }
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382 }
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383
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384
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385 /*
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386 * Downsample pixel values of a single component.
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387 * This version handles the special case of a full-size component,
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388 * with smoothing. One row of context is required.
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389 */
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390
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391 METHODDEF(void)
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392 fullsize_smooth_downsample (j_compress_ptr cinfo, jpeg_component_info *compptr,
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393 JSAMPARRAY input_data, JSAMPARRAY output_data)
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394 {
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395 int outrow;
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396 JDIMENSION colctr;
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397 JDIMENSION output_cols = compptr->width_in_blocks * DCTSIZE;
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398 register JSAMPROW inptr, above_ptr, below_ptr, outptr;
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399 INT32 membersum, neighsum, memberscale, neighscale;
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400 int colsum, lastcolsum, nextcolsum;
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401
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402 /* Expand input data enough to let all the output samples be generated
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403 * by the standard loop. Special-casing padded output would be more
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404 * efficient.
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405 */
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406 expand_right_edge(input_data - 1, cinfo->max_v_samp_factor + 2,
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407 cinfo->image_width, output_cols);
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408
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409 /* Each of the eight neighbor pixels contributes a fraction SF to the
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410 * smoothed pixel, while the main pixel contributes (1-8*SF). In order
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411 * to use integer arithmetic, these factors are multiplied by 2^16 = 65536.
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412 * Also recall that SF = smoothing_factor / 1024.
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413 */
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414
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415 memberscale = 65536L - cinfo->smoothing_factor * 512L; /* scaled 1-8*SF */
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416 neighscale = cinfo->smoothing_factor * 64; /* scaled SF */
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417
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418 for (outrow = 0; outrow < compptr->v_samp_factor; outrow++) {
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419 outptr = output_data[outrow];
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420 inptr = input_data[outrow];
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421 above_ptr = input_data[outrow-1];
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422 below_ptr = input_data[outrow+1];
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423
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424 /* Special case for first column */
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425 colsum = GETJSAMPLE(*above_ptr++) + GETJSAMPLE(*below_ptr++) +
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426 GETJSAMPLE(*inptr);
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427 membersum = GETJSAMPLE(*inptr++);
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428 nextcolsum = GETJSAMPLE(*above_ptr) + GETJSAMPLE(*below_ptr) +
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429 GETJSAMPLE(*inptr);
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430 neighsum = colsum + (colsum - membersum) + nextcolsum;
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431 membersum = membersum * memberscale + neighsum * neighscale;
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432 *outptr++ = (JSAMPLE) ((membersum + 32768) >> 16);
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433 lastcolsum = colsum; colsum = nextcolsum;
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434
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435 for (colctr = output_cols - 2; colctr > 0; colctr--) {
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436 membersum = GETJSAMPLE(*inptr++);
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437 above_ptr++; below_ptr++;
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438 nextcolsum = GETJSAMPLE(*above_ptr) + GETJSAMPLE(*below_ptr) +
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439 GETJSAMPLE(*inptr);
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440 neighsum = lastcolsum + (colsum - membersum) + nextcolsum;
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441 membersum = membersum * memberscale + neighsum * neighscale;
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442 *outptr++ = (JSAMPLE) ((membersum + 32768) >> 16);
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443 lastcolsum = colsum; colsum = nextcolsum;
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444 }
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445
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446 /* Special case for last column */
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447 membersum = GETJSAMPLE(*inptr);
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448 neighsum = lastcolsum + (colsum - membersum) + colsum;
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449 membersum = membersum * memberscale + neighsum * neighscale;
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450 *outptr = (JSAMPLE) ((membersum + 32768) >> 16);
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451
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452 }
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453 }
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454
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455 #endif /* INPUT_SMOOTHING_SUPPORTED */
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456
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457
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458 /*
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459 * Module initialization routine for downsampling.
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460 * Note that we must select a routine for each component.
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461 */
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462
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463 GLOBAL(void)
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464 jinit_downsampler (j_compress_ptr cinfo)
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465 {
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466 my_downsample_ptr downsample;
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467 int ci;
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468 jpeg_component_info * compptr;
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469 boolean smoothok = TRUE;
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470
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471 downsample = (my_downsample_ptr)
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472 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
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473 SIZEOF(my_downsampler));
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474 cinfo->downsample = (struct jpeg_downsampler *) downsample;
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475 downsample->pub.start_pass = start_pass_downsample;
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476 downsample->pub.downsample = sep_downsample;
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477 downsample->pub.need_context_rows = FALSE;
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diff changeset
478
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479 if (cinfo->CCIR601_sampling)
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480 ERREXIT(cinfo, JERR_CCIR601_NOTIMPL);
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481
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482 /* Verify we can handle the sampling factors, and set up method pointers */
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483 for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
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484 ci++, compptr++) {
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485 if (compptr->h_samp_factor == cinfo->max_h_samp_factor &&
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486 compptr->v_samp_factor == cinfo->max_v_samp_factor) {
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487 #ifdef INPUT_SMOOTHING_SUPPORTED
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488 if (cinfo->smoothing_factor) {
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489 downsample->methods[ci] = fullsize_smooth_downsample;
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490 downsample->pub.need_context_rows = TRUE;
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diff changeset
491 } else
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492 #endif
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493 downsample->methods[ci] = fullsize_downsample;
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494 } else if (compptr->h_samp_factor * 2 == cinfo->max_h_samp_factor &&
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495 compptr->v_samp_factor == cinfo->max_v_samp_factor) {
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496 smoothok = FALSE;
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497 downsample->methods[ci] = h2v1_downsample;
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498 } else if (compptr->h_samp_factor * 2 == cinfo->max_h_samp_factor &&
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diff changeset
499 compptr->v_samp_factor * 2 == cinfo->max_v_samp_factor) {
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diff changeset
500 #ifdef INPUT_SMOOTHING_SUPPORTED
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501 if (cinfo->smoothing_factor) {
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diff changeset
502 downsample->methods[ci] = h2v2_smooth_downsample;
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diff changeset
503 downsample->pub.need_context_rows = TRUE;
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diff changeset
504 } else
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diff changeset
505 #endif
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diff changeset
506 downsample->methods[ci] = h2v2_downsample;
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507 } else if ((cinfo->max_h_samp_factor % compptr->h_samp_factor) == 0 &&
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diff changeset
508 (cinfo->max_v_samp_factor % compptr->v_samp_factor) == 0) {
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diff changeset
509 smoothok = FALSE;
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diff changeset
510 downsample->methods[ci] = int_downsample;
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511 } else
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512 ERREXIT(cinfo, JERR_FRACT_SAMPLE_NOTIMPL);
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diff changeset
513 }
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diff changeset
514
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diff changeset
515 #ifdef INPUT_SMOOTHING_SUPPORTED
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516 if (cinfo->smoothing_factor && !smoothok)
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517 TRACEMS(cinfo, 0, JTRC_SMOOTH_NOTIMPL);
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diff changeset
518 #endif
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519 }