[86b99f7] | 1 | /* |
---|
| 2 | * wrtarga.c |
---|
| 3 | * |
---|
| 4 | * Copyright (C) 1991-1996, Thomas G. Lane. |
---|
| 5 | * This file is part of the Independent JPEG Group's software. |
---|
| 6 | * For conditions of distribution and use, see the accompanying README file. |
---|
| 7 | * |
---|
| 8 | * This file contains routines to write output images in Targa format. |
---|
| 9 | * |
---|
| 10 | * These routines may need modification for non-Unix environments or |
---|
| 11 | * specialized applications. As they stand, they assume output to |
---|
| 12 | * an ordinary stdio stream. |
---|
| 13 | * |
---|
| 14 | * Based on code contributed by Lee Daniel Crocker. |
---|
| 15 | */ |
---|
| 16 | |
---|
| 17 | #include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */ |
---|
| 18 | |
---|
| 19 | #ifdef TARGA_SUPPORTED |
---|
| 20 | |
---|
| 21 | |
---|
| 22 | /* |
---|
| 23 | * To support 12-bit JPEG data, we'd have to scale output down to 8 bits. |
---|
| 24 | * This is not yet implemented. |
---|
| 25 | */ |
---|
| 26 | |
---|
| 27 | #if BITS_IN_JSAMPLE != 8 |
---|
| 28 | Sorry, this code only copes with 8-bit JSAMPLEs. /* deliberate syntax err */ |
---|
| 29 | #endif |
---|
| 30 | |
---|
| 31 | /* |
---|
| 32 | * The output buffer needs to be writable by fwrite(). On PCs, we must |
---|
| 33 | * allocate the buffer in near data space, because we are assuming small-data |
---|
| 34 | * memory model, wherein fwrite() can't reach far memory. If you need to |
---|
| 35 | * process very wide images on a PC, you might have to compile in large-memory |
---|
| 36 | * model, or else replace fwrite() with a putc() loop --- which will be much |
---|
| 37 | * slower. |
---|
| 38 | */ |
---|
| 39 | |
---|
| 40 | |
---|
| 41 | /* Private version of data destination object */ |
---|
| 42 | |
---|
| 43 | typedef struct { |
---|
| 44 | struct djpeg_dest_struct pub; /* public fields */ |
---|
| 45 | |
---|
| 46 | char *iobuffer; /* physical I/O buffer */ |
---|
| 47 | JDIMENSION buffer_width; /* width of one row */ |
---|
| 48 | } tga_dest_struct; |
---|
| 49 | |
---|
| 50 | typedef tga_dest_struct * tga_dest_ptr; |
---|
| 51 | |
---|
| 52 | |
---|
| 53 | LOCAL(void) |
---|
| 54 | write_header (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo, int num_colors) |
---|
| 55 | /* Create and write a Targa header */ |
---|
| 56 | { |
---|
| 57 | char targaheader[18]; |
---|
| 58 | |
---|
| 59 | /* Set unused fields of header to 0 */ |
---|
| 60 | MEMZERO(targaheader, SIZEOF(targaheader)); |
---|
| 61 | |
---|
| 62 | if (num_colors > 0) { |
---|
| 63 | targaheader[1] = 1; /* color map type 1 */ |
---|
| 64 | targaheader[5] = (char) (num_colors & 0xFF); |
---|
| 65 | targaheader[6] = (char) (num_colors >> 8); |
---|
| 66 | targaheader[7] = 24; /* 24 bits per cmap entry */ |
---|
| 67 | } |
---|
| 68 | |
---|
| 69 | targaheader[12] = (char) (cinfo->output_width & 0xFF); |
---|
| 70 | targaheader[13] = (char) (cinfo->output_width >> 8); |
---|
| 71 | targaheader[14] = (char) (cinfo->output_height & 0xFF); |
---|
| 72 | targaheader[15] = (char) (cinfo->output_height >> 8); |
---|
| 73 | targaheader[17] = 0x20; /* Top-down, non-interlaced */ |
---|
| 74 | |
---|
| 75 | if (cinfo->out_color_space == JCS_GRAYSCALE) { |
---|
| 76 | targaheader[2] = 3; /* image type = uncompressed gray-scale */ |
---|
| 77 | targaheader[16] = 8; /* bits per pixel */ |
---|
| 78 | } else { /* must be RGB */ |
---|
| 79 | if (num_colors > 0) { |
---|
| 80 | targaheader[2] = 1; /* image type = colormapped RGB */ |
---|
| 81 | targaheader[16] = 8; |
---|
| 82 | } else { |
---|
| 83 | targaheader[2] = 2; /* image type = uncompressed RGB */ |
---|
| 84 | targaheader[16] = 24; |
---|
| 85 | } |
---|
| 86 | } |
---|
| 87 | |
---|
| 88 | if (JFWRITE(dinfo->output_file, targaheader, 18) != (size_t) 18) |
---|
| 89 | ERREXIT(cinfo, JERR_FILE_WRITE); |
---|
| 90 | } |
---|
| 91 | |
---|
| 92 | |
---|
| 93 | /* |
---|
| 94 | * Write some pixel data. |
---|
| 95 | * In this module rows_supplied will always be 1. |
---|
| 96 | */ |
---|
| 97 | |
---|
| 98 | METHODDEF(void) |
---|
| 99 | put_pixel_rows (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo, |
---|
| 100 | JDIMENSION rows_supplied) |
---|
| 101 | /* used for unquantized full-color output */ |
---|
| 102 | { |
---|
| 103 | tga_dest_ptr dest = (tga_dest_ptr) dinfo; |
---|
| 104 | register JSAMPROW inptr; |
---|
| 105 | register char * outptr; |
---|
| 106 | register JDIMENSION col; |
---|
| 107 | |
---|
| 108 | inptr = dest->pub.buffer[0]; |
---|
| 109 | outptr = dest->iobuffer; |
---|
| 110 | for (col = cinfo->output_width; col > 0; col--) { |
---|
| 111 | outptr[0] = (char) GETJSAMPLE(inptr[2]); /* RGB to BGR order */ |
---|
| 112 | outptr[1] = (char) GETJSAMPLE(inptr[1]); |
---|
| 113 | outptr[2] = (char) GETJSAMPLE(inptr[0]); |
---|
| 114 | inptr += 3, outptr += 3; |
---|
| 115 | } |
---|
| 116 | (void) JFWRITE(dest->pub.output_file, dest->iobuffer, dest->buffer_width); |
---|
| 117 | } |
---|
| 118 | |
---|
| 119 | METHODDEF(void) |
---|
| 120 | put_gray_rows (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo, |
---|
| 121 | JDIMENSION rows_supplied) |
---|
| 122 | /* used for grayscale OR quantized color output */ |
---|
| 123 | { |
---|
| 124 | tga_dest_ptr dest = (tga_dest_ptr) dinfo; |
---|
| 125 | register JSAMPROW inptr; |
---|
| 126 | register char * outptr; |
---|
| 127 | register JDIMENSION col; |
---|
| 128 | |
---|
| 129 | inptr = dest->pub.buffer[0]; |
---|
| 130 | outptr = dest->iobuffer; |
---|
| 131 | for (col = cinfo->output_width; col > 0; col--) { |
---|
| 132 | *outptr++ = (char) GETJSAMPLE(*inptr++); |
---|
| 133 | } |
---|
| 134 | (void) JFWRITE(dest->pub.output_file, dest->iobuffer, dest->buffer_width); |
---|
| 135 | } |
---|
| 136 | |
---|
| 137 | |
---|
| 138 | /* |
---|
| 139 | * Write some demapped pixel data when color quantization is in effect. |
---|
| 140 | * For Targa, this is only applied to grayscale data. |
---|
| 141 | */ |
---|
| 142 | |
---|
| 143 | METHODDEF(void) |
---|
| 144 | put_demapped_gray (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo, |
---|
| 145 | JDIMENSION rows_supplied) |
---|
| 146 | { |
---|
| 147 | tga_dest_ptr dest = (tga_dest_ptr) dinfo; |
---|
| 148 | register JSAMPROW inptr; |
---|
| 149 | register char * outptr; |
---|
| 150 | register JSAMPROW color_map0 = cinfo->colormap[0]; |
---|
| 151 | register JDIMENSION col; |
---|
| 152 | |
---|
| 153 | inptr = dest->pub.buffer[0]; |
---|
| 154 | outptr = dest->iobuffer; |
---|
| 155 | for (col = cinfo->output_width; col > 0; col--) { |
---|
| 156 | *outptr++ = (char) GETJSAMPLE(color_map0[GETJSAMPLE(*inptr++)]); |
---|
| 157 | } |
---|
| 158 | (void) JFWRITE(dest->pub.output_file, dest->iobuffer, dest->buffer_width); |
---|
| 159 | } |
---|
| 160 | |
---|
| 161 | |
---|
| 162 | /* |
---|
| 163 | * Startup: write the file header. |
---|
| 164 | */ |
---|
| 165 | |
---|
| 166 | METHODDEF(void) |
---|
| 167 | start_output_tga (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo) |
---|
| 168 | { |
---|
| 169 | tga_dest_ptr dest = (tga_dest_ptr) dinfo; |
---|
| 170 | int num_colors, i; |
---|
| 171 | FILE *outfile; |
---|
| 172 | |
---|
| 173 | if (cinfo->out_color_space == JCS_GRAYSCALE) { |
---|
| 174 | /* Targa doesn't have a mapped grayscale format, so we will */ |
---|
| 175 | /* demap quantized gray output. Never emit a colormap. */ |
---|
| 176 | write_header(cinfo, dinfo, 0); |
---|
| 177 | if (cinfo->quantize_colors) |
---|
| 178 | dest->pub.put_pixel_rows = put_demapped_gray; |
---|
| 179 | else |
---|
| 180 | dest->pub.put_pixel_rows = put_gray_rows; |
---|
| 181 | } else if (cinfo->out_color_space == JCS_RGB) { |
---|
| 182 | if (cinfo->quantize_colors) { |
---|
| 183 | /* We only support 8-bit colormap indexes, so only 256 colors */ |
---|
| 184 | num_colors = cinfo->actual_number_of_colors; |
---|
| 185 | if (num_colors > 256) |
---|
| 186 | ERREXIT1(cinfo, JERR_TOO_MANY_COLORS, num_colors); |
---|
| 187 | write_header(cinfo, dinfo, num_colors); |
---|
| 188 | /* Write the colormap. Note Targa uses BGR byte order */ |
---|
| 189 | outfile = dest->pub.output_file; |
---|
| 190 | for (i = 0; i < num_colors; i++) { |
---|
| 191 | putc(GETJSAMPLE(cinfo->colormap[2][i]), outfile); |
---|
| 192 | putc(GETJSAMPLE(cinfo->colormap[1][i]), outfile); |
---|
| 193 | putc(GETJSAMPLE(cinfo->colormap[0][i]), outfile); |
---|
| 194 | } |
---|
| 195 | dest->pub.put_pixel_rows = put_gray_rows; |
---|
| 196 | } else { |
---|
| 197 | write_header(cinfo, dinfo, 0); |
---|
| 198 | dest->pub.put_pixel_rows = put_pixel_rows; |
---|
| 199 | } |
---|
| 200 | } else { |
---|
| 201 | ERREXIT(cinfo, JERR_TGA_COLORSPACE); |
---|
| 202 | } |
---|
| 203 | } |
---|
| 204 | |
---|
| 205 | |
---|
| 206 | /* |
---|
| 207 | * Finish up at the end of the file. |
---|
| 208 | */ |
---|
| 209 | |
---|
| 210 | METHODDEF(void) |
---|
| 211 | finish_output_tga (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo) |
---|
| 212 | { |
---|
| 213 | /* Make sure we wrote the output file OK */ |
---|
| 214 | fflush(dinfo->output_file); |
---|
| 215 | if (ferror(dinfo->output_file)) |
---|
| 216 | ERREXIT(cinfo, JERR_FILE_WRITE); |
---|
| 217 | } |
---|
| 218 | |
---|
| 219 | |
---|
| 220 | /* |
---|
| 221 | * The module selection routine for Targa format output. |
---|
| 222 | */ |
---|
| 223 | |
---|
| 224 | GLOBAL(djpeg_dest_ptr) |
---|
| 225 | jinit_write_targa (j_decompress_ptr cinfo) |
---|
| 226 | { |
---|
| 227 | tga_dest_ptr dest; |
---|
| 228 | |
---|
| 229 | /* Create module interface object, fill in method pointers */ |
---|
| 230 | dest = (tga_dest_ptr) |
---|
| 231 | (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
---|
| 232 | SIZEOF(tga_dest_struct)); |
---|
| 233 | dest->pub.start_output = start_output_tga; |
---|
| 234 | dest->pub.finish_output = finish_output_tga; |
---|
| 235 | |
---|
| 236 | /* Calculate output image dimensions so we can allocate space */ |
---|
| 237 | jpeg_calc_output_dimensions(cinfo); |
---|
| 238 | |
---|
| 239 | /* Create I/O buffer. Note we make this near on a PC. */ |
---|
| 240 | dest->buffer_width = cinfo->output_width * cinfo->output_components; |
---|
| 241 | dest->iobuffer = (char *) |
---|
| 242 | (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
---|
| 243 | (size_t) (dest->buffer_width * SIZEOF(char))); |
---|
| 244 | |
---|
| 245 | /* Create decompressor output buffer. */ |
---|
| 246 | dest->pub.buffer = (*cinfo->mem->alloc_sarray) |
---|
| 247 | ((j_common_ptr) cinfo, JPOOL_IMAGE, dest->buffer_width, (JDIMENSION) 1); |
---|
| 248 | dest->pub.buffer_height = 1; |
---|
| 249 | |
---|
| 250 | return (djpeg_dest_ptr) dest; |
---|
| 251 | } |
---|
| 252 | |
---|
| 253 | #endif /* TARGA_SUPPORTED */ |
---|