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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4680 | right-hear | 1 | #include "fitz.h" |
| 2 | #include "muxps.h" |
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| 3 | |||
| 4 | #include |
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| 5 | #include |
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| 6 | |||
| 7 | struct jpeg_error_mgr_jmp |
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| 8 | { |
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| 9 | struct jpeg_error_mgr super; |
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| 10 | jmp_buf env; |
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| 11 | char msg[JMSG_LENGTH_MAX]; |
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| 12 | }; |
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| 13 | |||
| 14 | static void error_exit(j_common_ptr cinfo) |
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| 15 | { |
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| 16 | struct jpeg_error_mgr_jmp *err = (struct jpeg_error_mgr_jmp *)cinfo->err; |
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| 17 | cinfo->err->format_message(cinfo, err->msg); |
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| 18 | longjmp(err->env, 1); |
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| 19 | } |
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| 20 | |||
| 21 | static void init_source(j_decompress_ptr cinfo) |
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| 22 | { |
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| 23 | /* nothing to do */ |
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| 24 | } |
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| 25 | |||
| 26 | static void term_source(j_decompress_ptr cinfo) |
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| 27 | { |
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| 28 | /* nothing to do */ |
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| 29 | } |
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| 30 | |||
| 31 | static boolean fill_input_buffer(j_decompress_ptr cinfo) |
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| 32 | { |
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| 33 | static unsigned char eoi[2] = { 0xFF, JPEG_EOI }; |
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| 34 | struct jpeg_source_mgr *src = cinfo->src; |
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| 35 | src->next_input_byte = eoi; |
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| 36 | src->bytes_in_buffer = 2; |
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| 37 | return 1; |
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| 38 | } |
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| 39 | |||
| 40 | static void skip_input_data(j_decompress_ptr cinfo, long num_bytes) |
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| 41 | { |
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| 42 | struct jpeg_source_mgr *src = cinfo->src; |
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| 43 | if (num_bytes > 0) |
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| 44 | { |
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| 45 | src->next_input_byte += num_bytes; |
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| 46 | src->bytes_in_buffer -= num_bytes; |
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| 47 | } |
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| 48 | } |
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| 49 | |||
| 50 | int |
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| 51 | xps_decode_jpeg(fz_pixmap **imagep, byte *rbuf, int rlen) |
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| 52 | { |
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| 53 | struct jpeg_decompress_struct cinfo; |
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| 54 | struct jpeg_error_mgr_jmp err; |
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| 55 | struct jpeg_source_mgr src; |
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| 56 | unsigned char *row[1], *sp, *dp; |
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| 57 | fz_colorspace *colorspace; |
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| 58 | unsigned int x; |
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| 59 | int k; |
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| 60 | |||
| 61 | fz_pixmap *image = NULL; |
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| 62 | |||
| 63 | if (setjmp(err.env)) |
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| 64 | { |
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| 65 | if (image) |
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| 66 | fz_drop_pixmap(image); |
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| 67 | return fz_throw("jpeg error: %s", err.msg); |
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| 68 | } |
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| 69 | |||
| 70 | cinfo.err = jpeg_std_error(&err.super); |
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| 71 | err.super.error_exit = error_exit; |
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| 72 | |||
| 73 | jpeg_create_decompress(&cinfo); |
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| 74 | |||
| 75 | cinfo.src = &src; |
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| 76 | src.init_source = init_source; |
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| 77 | src.fill_input_buffer = fill_input_buffer; |
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| 78 | src.skip_input_data = skip_input_data; |
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| 79 | src.resync_to_restart = jpeg_resync_to_restart; |
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| 80 | src.term_source = term_source; |
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| 81 | src.next_input_byte = rbuf; |
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| 82 | src.bytes_in_buffer = rlen; |
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| 83 | |||
| 84 | jpeg_read_header(&cinfo, 1); |
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| 85 | |||
| 86 | jpeg_start_decompress(&cinfo); |
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| 87 | |||
| 88 | if (cinfo.output_components == 1) |
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| 89 | colorspace = fz_device_gray; |
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| 90 | else if (cinfo.output_components == 3) |
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| 91 | colorspace = fz_device_rgb; |
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| 92 | else if (cinfo.output_components == 4) |
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| 93 | colorspace = fz_device_cmyk; |
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| 94 | else |
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| 95 | return fz_throw("bad number of components in jpeg: %d", cinfo.output_components); |
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| 96 | |||
| 97 | image = fz_new_pixmap_with_limit(colorspace, cinfo.output_width, cinfo.output_height); |
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| 98 | if (!image) |
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| 99 | { |
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| 100 | jpeg_finish_decompress(&cinfo); |
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| 101 | jpeg_destroy_decompress(&cinfo); |
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| 102 | return fz_throw("out of memory"); |
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| 103 | } |
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| 104 | |||
| 105 | if (cinfo.density_unit == 1) |
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| 106 | { |
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| 107 | image->xres = cinfo.X_density; |
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| 108 | image->yres = cinfo.Y_density; |
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| 109 | } |
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| 110 | else if (cinfo.density_unit == 2) |
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| 111 | { |
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| 112 | image->xres = cinfo.X_density * 254 / 100; |
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| 113 | image->yres = cinfo.Y_density * 254 / 100; |
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| 114 | } |
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| 115 | |||
| 116 | fz_clear_pixmap(image); |
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| 117 | |||
| 118 | row[0] = fz_malloc(cinfo.output_components * cinfo.output_width); |
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| 119 | dp = image->samples; |
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| 120 | while (cinfo.output_scanline < cinfo.output_height) |
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| 121 | { |
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| 122 | jpeg_read_scanlines(&cinfo, row, 1); |
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| 123 | sp = row[0]; |
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| 124 | for (x = 0; x < cinfo.output_width; x++) |
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| 125 | { |
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| 126 | for (k = 0; k < cinfo.output_components; k++) |
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| 127 | *dp++ = *sp++; |
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| 128 | *dp++ = 255; |
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| 129 | } |
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| 130 | } |
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| 131 | fz_free(row[0]); |
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| 132 | |||
| 133 | jpeg_finish_decompress(&cinfo); |
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| 134 | jpeg_destroy_decompress(&cinfo); |
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| 135 | |||
| 136 | *imagep = image; |
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| 137 | return fz_okay; |
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| 138 | } |