+++ /dev/null
-/*
- * wrtarga.c
- *
- * Copyright (C) 1991-1996, Thomas G. Lane.
- * This file is part of the Independent JPEG Group's software.
- * For conditions of distribution and use, see the accompanying README file.
- *
- * This file contains routines to write output images in Targa format.
- *
- * These routines may need modification for non-Unix environments or
- * specialized applications. As they stand, they assume output to
- * an ordinary stdio stream.
- *
- * Based on code contributed by Lee Daniel Crocker.
- */
-
-#include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */
-
-#ifdef TARGA_SUPPORTED
-
-
-/*
- * To support 12-bit JPEG data, we'd have to scale output down to 8 bits.
- * This is not yet implemented.
- */
-
-#if BITS_IN_JSAMPLE != 8
- Sorry, this code only copes with 8-bit JSAMPLEs. /* deliberate syntax err */
-#endif
-
-/*
- * The output buffer needs to be writable by fwrite(). On PCs, we must
- * allocate the buffer in near data space, because we are assuming small-data
- * memory model, wherein fwrite() can't reach far memory. If you need to
- * process very wide images on a PC, you might have to compile in large-memory
- * model, or else replace fwrite() with a putc() loop --- which will be much
- * slower.
- */
-
-
-/* Private version of data destination object */
-
-typedef struct {
- struct djpeg_dest_struct pub; /* public fields */
-
- char *iobuffer; /* physical I/O buffer */
- JDIMENSION buffer_width; /* width of one row */
-} tga_dest_struct;
-
-typedef tga_dest_struct * tga_dest_ptr;
-
-
-LOCAL(void)
-write_header (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo, int num_colors)
-/* Create and write a Targa header */
-{
- char targaheader[18];
-
- /* Set unused fields of header to 0 */
- MEMZERO(targaheader, SIZEOF(targaheader));
-
- if (num_colors > 0) {
- targaheader[1] = 1; /* color map type 1 */
- targaheader[5] = (char) (num_colors & 0xFF);
- targaheader[6] = (char) (num_colors >> 8);
- targaheader[7] = 24; /* 24 bits per cmap entry */
- }
-
- targaheader[12] = (char) (cinfo->output_width & 0xFF);
- targaheader[13] = (char) (cinfo->output_width >> 8);
- targaheader[14] = (char) (cinfo->output_height & 0xFF);
- targaheader[15] = (char) (cinfo->output_height >> 8);
- targaheader[17] = 0x20; /* Top-down, non-interlaced */
-
- if (cinfo->out_color_space == JCS_GRAYSCALE) {
- targaheader[2] = 3; /* image type = uncompressed gray-scale */
- targaheader[16] = 8; /* bits per pixel */
- } else { /* must be RGB */
- if (num_colors > 0) {
- targaheader[2] = 1; /* image type = colormapped RGB */
- targaheader[16] = 8;
- } else {
- targaheader[2] = 2; /* image type = uncompressed RGB */
- targaheader[16] = 24;
- }
- }
-
- if (JFWRITE(dinfo->output_file, targaheader, 18) != (size_t) 18)
- ERREXIT(cinfo, JERR_FILE_WRITE);
-}
-
-
-/*
- * Write some pixel data.
- * In this module rows_supplied will always be 1.
- */
-
-METHODDEF(void)
-put_pixel_rows (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo,
- JDIMENSION rows_supplied)
-/* used for unquantized full-color output */
-{
- tga_dest_ptr dest = (tga_dest_ptr) dinfo;
- register JSAMPROW inptr;
- register char * outptr;
- register JDIMENSION col;
-
- inptr = dest->pub.buffer[0];
- outptr = dest->iobuffer;
- for (col = cinfo->output_width; col > 0; col--) {
- outptr[0] = (char) GETJSAMPLE(inptr[2]); /* RGB to BGR order */
- outptr[1] = (char) GETJSAMPLE(inptr[1]);
- outptr[2] = (char) GETJSAMPLE(inptr[0]);
- inptr += 3, outptr += 3;
- }
- (void) JFWRITE(dest->pub.output_file, dest->iobuffer, dest->buffer_width);
-}
-
-METHODDEF(void)
-put_gray_rows (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo,
- JDIMENSION rows_supplied)
-/* used for grayscale OR quantized color output */
-{
- tga_dest_ptr dest = (tga_dest_ptr) dinfo;
- register JSAMPROW inptr;
- register char * outptr;
- register JDIMENSION col;
-
- inptr = dest->pub.buffer[0];
- outptr = dest->iobuffer;
- for (col = cinfo->output_width; col > 0; col--) {
- *outptr++ = (char) GETJSAMPLE(*inptr++);
- }
- (void) JFWRITE(dest->pub.output_file, dest->iobuffer, dest->buffer_width);
-}
-
-
-/*
- * Write some demapped pixel data when color quantization is in effect.
- * For Targa, this is only applied to grayscale data.
- */
-
-METHODDEF(void)
-put_demapped_gray (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo,
- JDIMENSION rows_supplied)
-{
- tga_dest_ptr dest = (tga_dest_ptr) dinfo;
- register JSAMPROW inptr;
- register char * outptr;
- register JSAMPROW color_map0 = cinfo->colormap[0];
- register JDIMENSION col;
-
- inptr = dest->pub.buffer[0];
- outptr = dest->iobuffer;
- for (col = cinfo->output_width; col > 0; col--) {
- *outptr++ = (char) GETJSAMPLE(color_map0[GETJSAMPLE(*inptr++)]);
- }
- (void) JFWRITE(dest->pub.output_file, dest->iobuffer, dest->buffer_width);
-}
-
-
-/*
- * Startup: write the file header.
- */
-
-METHODDEF(void)
-start_output_tga (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo)
-{
- tga_dest_ptr dest = (tga_dest_ptr) dinfo;
- int num_colors, i;
- FILE *outfile;
-
- if (cinfo->out_color_space == JCS_GRAYSCALE) {
- /* Targa doesn't have a mapped grayscale format, so we will */
- /* demap quantized gray output. Never emit a colormap. */
- write_header(cinfo, dinfo, 0);
- if (cinfo->quantize_colors)
- dest->pub.put_pixel_rows = put_demapped_gray;
- else
- dest->pub.put_pixel_rows = put_gray_rows;
- } else if (cinfo->out_color_space == JCS_RGB) {
- if (cinfo->quantize_colors) {
- /* We only support 8-bit colormap indexes, so only 256 colors */
- num_colors = cinfo->actual_number_of_colors;
- if (num_colors > 256)
- ERREXIT1(cinfo, JERR_TOO_MANY_COLORS, num_colors);
- write_header(cinfo, dinfo, num_colors);
- /* Write the colormap. Note Targa uses BGR byte order */
- outfile = dest->pub.output_file;
- for (i = 0; i < num_colors; i++) {
- putc(GETJSAMPLE(cinfo->colormap[2][i]), outfile);
- putc(GETJSAMPLE(cinfo->colormap[1][i]), outfile);
- putc(GETJSAMPLE(cinfo->colormap[0][i]), outfile);
- }
- dest->pub.put_pixel_rows = put_gray_rows;
- } else {
- write_header(cinfo, dinfo, 0);
- dest->pub.put_pixel_rows = put_pixel_rows;
- }
- } else {
- ERREXIT(cinfo, JERR_TGA_COLORSPACE);
- }
-}
-
-
-/*
- * Finish up at the end of the file.
- */
-
-METHODDEF(void)
-finish_output_tga (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo)
-{
- /* Make sure we wrote the output file OK */
- fflush(dinfo->output_file);
- if (ferror(dinfo->output_file))
- ERREXIT(cinfo, JERR_FILE_WRITE);
-}
-
-
-/*
- * The module selection routine for Targa format output.
- */
-
-GLOBAL(djpeg_dest_ptr)
-jinit_write_targa (j_decompress_ptr cinfo)
-{
- tga_dest_ptr dest;
-
- /* Create module interface object, fill in method pointers */
- dest = (tga_dest_ptr)
- (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
- SIZEOF(tga_dest_struct));
- dest->pub.start_output = start_output_tga;
- dest->pub.finish_output = finish_output_tga;
-
- /* Calculate output image dimensions so we can allocate space */
- jpeg_calc_output_dimensions(cinfo);
-
- /* Create I/O buffer. Note we make this near on a PC. */
- dest->buffer_width = cinfo->output_width * cinfo->output_components;
- dest->iobuffer = (char *)
- (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
- (size_t) (dest->buffer_width * SIZEOF(char)));
-
- /* Create decompressor output buffer. */
- dest->pub.buffer = (*cinfo->mem->alloc_sarray)
- ((j_common_ptr) cinfo, JPOOL_IMAGE, dest->buffer_width, (JDIMENSION) 1);
- dest->pub.buffer_height = 1;
-
- return (djpeg_dest_ptr) dest;
-}
-
-#endif /* TARGA_SUPPORTED */
projects / reactos.git / blobdiff