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annotate jpg.c @ 4:5ff6a67e1421

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author Peter Meerwald <pmeerw@pmeerw.net>
date Mon, 09 May 2011 23:32:51 +0200
parents e8957085fe8a
children 3819ecaf0f14
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1 #include <stdlib.h>
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2 #include <stdio.h>
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3 #include <unistd.h>
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4 #include <string.h>
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5 #include "jpeglib.h"
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6 #include "jerror.h"
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7
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8 #include "common.h"
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9
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10 typedef struct {
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11 struct jpeg_destination_mgr pub; /* public fields */
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12
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13 unsigned char ** outbuffer; /* target buffer */
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14 unsigned long * outsize;
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15 unsigned char * newbuffer; /* newly allocated buffer */
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16 JOCTET * buffer; /* start of buffer */
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17 size_t bufsize;
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18 } mem_dest_mgr;
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19
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20 typedef mem_dest_mgr * mem_dest_mgr_ptr;
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21
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22 static void init_mem_destination (j_compress_ptr cinfo) {
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23 }
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25 static boolean empty_mem_output_buffer(j_compress_ptr cinfo) {
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26 size_t nextsize;
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27 JOCTET * nextbuffer;
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28 mem_dest_mgr_ptr dest = (mem_dest_mgr_ptr) cinfo->dest;
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29
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30 /* Try to allocate new buffer with double size */
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31 nextsize = dest->bufsize * 2;
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32 nextbuffer = malloc(nextsize);
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34 if (nextbuffer == NULL)
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35 ERREXIT1(cinfo, JERR_OUT_OF_MEMORY, 10);
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36
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37 memcpy(nextbuffer, dest->buffer, dest->bufsize);
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38
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39 if (dest->newbuffer != NULL)
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40 free(dest->newbuffer);
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41
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42 dest->newbuffer = nextbuffer;
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43
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44 dest->pub.next_output_byte = nextbuffer + dest->bufsize;
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45 dest->pub.free_in_buffer = dest->bufsize;
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46
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47 dest->buffer = nextbuffer;
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48 dest->bufsize = nextsize;
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49
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50 return TRUE;
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51 }
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52
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53 static void term_mem_destination(j_compress_ptr cinfo) {
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54 mem_dest_mgr_ptr dest = (mem_dest_mgr_ptr) cinfo->dest;
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55
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56 *dest->outbuffer = dest->buffer;
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57 *dest->outsize = dest->bufsize - dest->pub.free_in_buffer;
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58 }
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59
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60 static void jpeg_mem_dest(j_compress_ptr cinfo, unsigned char ** outbuffer, unsigned long * outsize) {
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61 mem_dest_mgr_ptr dest;
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62
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63 if (outbuffer == NULL || outsize == NULL) /* sanity check */
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64 ERREXIT(cinfo, JERR_BUFFER_SIZE);
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65
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66 /* The destination object is made permanent so that multiple JPEG images
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67 * can be written to the same buffer without re-executing jpeg_mem_dest.
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68 */
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69 if (cinfo->dest == NULL) { /* first time for this JPEG object? */
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70 cinfo->dest = (struct jpeg_destination_mgr *)
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71 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
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72 sizeof(mem_dest_mgr));
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73 }
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74
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75 dest = (mem_dest_mgr_ptr) cinfo->dest;
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76 dest->pub.init_destination = init_mem_destination;
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77 dest->pub.empty_output_buffer = empty_mem_output_buffer;
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78 dest->pub.term_destination = term_mem_destination;
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79 dest->outbuffer = outbuffer;
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80 dest->outsize = outsize;
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81 dest->newbuffer = NULL;
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82
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83 if (*outbuffer == NULL || *outsize == 0) {
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84 /* Allocate initial buffer */
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85 dest->newbuffer = *outbuffer = malloc(65536);
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86 if (dest->newbuffer == NULL)
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87 ERREXIT1(cinfo, JERR_OUT_OF_MEMORY, 10);
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88 *outsize = 65536;
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89 }
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90
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91 dest->pub.next_output_byte = dest->buffer = *outbuffer;
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92 dest->pub.free_in_buffer = dest->bufsize = *outsize;
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93 }
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94
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96
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97 jpg_buf_t build_jpg_from_fb(int fb, int width, int height) {
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98 int scanline;
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99 struct jpeg_compress_struct cinfo;
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100 struct jpeg_error_mgr jerr;
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101
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102 cinfo.err = jpeg_std_error(&jerr);
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103 jpeg_create_compress(&cinfo);
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104
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105 jpg_buf_t jpg_buf;
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106 jpg_buf.size = 1 << 20;
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107 jpg_buf.ptr = NULL;
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108
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109 jpeg_mem_dest(&cinfo, &jpg_buf.ptr, &jpg_buf.size);
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110
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111 cinfo.image_width = width;
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112 cinfo.image_height = height;
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113 cinfo.input_components = 3;
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114 cinfo.in_color_space = JCS_RGB;
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115 jpeg_set_defaults(&cinfo);
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116
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117 jpeg_start_compress(&cinfo, TRUE);
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118
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119 JSAMPLE *buf = malloc(width * 4);
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120 JSAMPROW row_ptr[1];
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121 row_ptr[0] = buf;
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122 for (scanline = 0; scanline < height; scanline++) {
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123 read(fb, buf, width*4);
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124 jpeg_write_scanlines(&cinfo, row_ptr, 1);
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125 }
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126 free(buf);
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127
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128 jpeg_finish_compress(&cinfo);
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129
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130 jpeg_destroy_compress(&cinfo);
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131
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132 return jpg_buf;
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133 }

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