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annotate jpg.c @ 2:bac8ed8d6eb9

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add jpeg coding and test stuff
author Peter Meerwald <pmeerw@pmeerw.net>
date Sun, 08 May 2011 18:22:22 +0200
parents
children e8957085fe8a
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2
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1 #include <stdlib.h>
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2 #include <stdio.h>
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3 #include <string.h>
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4 #include "jpeglib.h"
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5 #include "jerror.h"
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6
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7 typedef struct {
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8 struct jpeg_destination_mgr pub; /* public fields */
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9
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10 unsigned char ** outbuffer; /* target buffer */
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11 unsigned long * outsize;
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12 unsigned char * newbuffer; /* newly allocated buffer */
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13 JOCTET * buffer; /* start of buffer */
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14 size_t bufsize;
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15 } mem_dest_mgr;
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16
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17 typedef mem_dest_mgr * mem_dest_mgr_ptr;
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18
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19 void init_mem_destination (j_compress_ptr cinfo) {
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20 }
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21
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22 boolean empty_mem_output_buffer(j_compress_ptr cinfo) {
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23 size_t nextsize;
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24 JOCTET * nextbuffer;
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25 mem_dest_mgr_ptr dest = (mem_dest_mgr_ptr) cinfo->dest;
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26
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27 /* Try to allocate new buffer with double size */
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28 nextsize = dest->bufsize * 2;
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29 nextbuffer = malloc(nextsize);
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30
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31 if (nextbuffer == NULL)
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32 ERREXIT1(cinfo, JERR_OUT_OF_MEMORY, 10);
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33
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34 memcpy(nextbuffer, dest->buffer, dest->bufsize);
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35
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36 if (dest->newbuffer != NULL)
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37 free(dest->newbuffer);
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38
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39 dest->newbuffer = nextbuffer;
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40
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41 dest->pub.next_output_byte = nextbuffer + dest->bufsize;
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42 dest->pub.free_in_buffer = dest->bufsize;
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43
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44 dest->buffer = nextbuffer;
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45 dest->bufsize = nextsize;
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46
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47 return TRUE;
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48 }
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49
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50 void term_mem_destination(j_compress_ptr cinfo) {
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51 mem_dest_mgr_ptr dest = (mem_dest_mgr_ptr) cinfo->dest;
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52
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53 *dest->outbuffer = dest->buffer;
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54 *dest->outsize = dest->bufsize - dest->pub.free_in_buffer;
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55 }
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56
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57 void jpeg_mem_dest(j_compress_ptr cinfo, unsigned char ** outbuffer, unsigned long * outsize) {
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58 mem_dest_mgr_ptr dest;
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59
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60 if (outbuffer == NULL || outsize == NULL) /* sanity check */
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61 ERREXIT(cinfo, JERR_BUFFER_SIZE);
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62
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63 /* The destination object is made permanent so that multiple JPEG images
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64 * can be written to the same buffer without re-executing jpeg_mem_dest.
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65 */
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66 if (cinfo->dest == NULL) { /* first time for this JPEG object? */
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67 cinfo->dest = (struct jpeg_destination_mgr *)
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68 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
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69 sizeof(mem_dest_mgr));
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70 }
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71
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72 dest = (mem_dest_mgr_ptr) cinfo->dest;
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73 dest->pub.init_destination = init_mem_destination;
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74 dest->pub.empty_output_buffer = empty_mem_output_buffer;
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75 dest->pub.term_destination = term_mem_destination;
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76 dest->outbuffer = outbuffer;
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77 dest->outsize = outsize;
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78 dest->newbuffer = NULL;
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79
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80 if (*outbuffer == NULL || *outsize == 0) {
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81 /* Allocate initial buffer */
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82 dest->newbuffer = *outbuffer = malloc(65536);
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83 if (dest->newbuffer == NULL)
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84 ERREXIT1(cinfo, JERR_OUT_OF_MEMORY, 10);
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85 *outsize = 65536;
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86 }
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87
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88 dest->pub.next_output_byte = dest->buffer = *outbuffer;
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89 dest->pub.free_in_buffer = dest->bufsize = *outsize;
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90 }
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91
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92
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93 int build_jpg(JSAMPLE *image_buf, int width, int height) {
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94 int scanline;
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95 struct jpeg_compress_struct cinfo;
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96 struct jpeg_error_mgr jerr;
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97
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98 cinfo.err = jpeg_std_error(&jerr);
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99 jpeg_create_compress(&cinfo);
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100
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101 unsigned long out_size = 1<<20;
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102 unsigned char *out_buf = NULL;
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103 jpeg_mem_dest(&cinfo, &out_buf, &out_size);
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104
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105 cinfo.image_width = width;
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106 cinfo.image_height = height;
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107 cinfo.input_components = 3;
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108 cinfo.in_color_space = JCS_RGB;
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109 jpeg_set_defaults(&cinfo);
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110
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111 jpeg_start_compress(&cinfo, TRUE);
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112
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113 for (scanline = 0; scanline < height; scanline++) {
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114 JSAMPROW *row_ptr;
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115 row_ptr = &image_buf[scanline * width];
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116 jpeg_write_scanlines(&cinfo, row_ptr, 1);
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117 }
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118
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119 jpeg_finish_compress(&cinfo);
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120
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121 jpeg_destroy_compress(&cinfo);
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122
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123 return 0;
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124 }

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