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435a566751
* sumatrapdf - vendor import * everything compiles (libjpeg, poppler, fitz, sumatrapdf) * does NOT link (remove the comment tags in the parent directory.rbuild file (rosapps dir) to build it) svn path=/trunk/; revision=29295
221 lines
4.4 KiB
C
221 lines
4.4 KiB
C
#include "fitz-base.h"
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#include "fitz-stream.h"
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#include "filt_dctc.h"
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typedef struct fz_dctd_s fz_dctd;
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struct mysrcmgr
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{
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struct jpeg_source_mgr super;
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fz_buffer *buf;
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int skip;
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};
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struct fz_dctd_s
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{
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fz_filter super;
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struct jpeg_decompress_struct cinfo;
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struct mysrcmgr src;
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struct myerrmgr err;
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int colortransform;
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int stage;
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};
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static void myinitsource(j_decompress_ptr cinfo) { /* empty */ }
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static boolean myfillinput(j_decompress_ptr cinfo) { return FALSE; }
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static void mytermsource(j_decompress_ptr cinfo) { /* empty */ }
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static void myskipinput(j_decompress_ptr cinfo, long n)
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{
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struct mysrcmgr *src = (struct mysrcmgr *)cinfo->src;
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fz_buffer *in = src->buf;
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assert(src->skip == 0);
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in->rp = in->wp - src->super.bytes_in_buffer;
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if (in->rp + n > in->wp) {
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src->skip = (in->rp + n) - in->wp;
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in->rp = in->wp;
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}
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else {
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src->skip = 0;
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in->rp += n;
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}
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src->super.bytes_in_buffer = in->wp - in->rp;
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src->super.next_input_byte = in->rp;
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}
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fz_error *
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fz_newdctd(fz_filter **fp, fz_obj *params)
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{
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fz_error *err;
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fz_obj *obj;
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int colortransform;
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FZ_NEWFILTER(fz_dctd, d, dctd);
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colortransform = 1;
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if (params) {
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obj = fz_dictgets(params, "ColorTransform");
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if (obj) colortransform = fz_toint(obj);
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}
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d->colortransform = colortransform;
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d->stage = 0;
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/* setup error callback first thing */
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myiniterr(&d->err);
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d->cinfo.err = (struct jpeg_error_mgr*) &d->err;
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if (setjmp(d->err.jb)) {
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err = fz_throw("ioerror in dctd: %s", d->err.msg);
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fz_free(d);
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return err;
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}
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/* create decompression object. this zeroes cinfo except for err. */
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jpeg_create_decompress(&d->cinfo);
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/* prepare source manager */
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d->cinfo.src = (struct jpeg_source_mgr *)&d->src;
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d->src.super.init_source = myinitsource;
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d->src.super.fill_input_buffer = myfillinput;
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d->src.super.skip_input_data = myskipinput;
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d->src.super.resync_to_restart = jpeg_resync_to_restart;
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d->src.super.term_source = mytermsource;
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d->src.super.bytes_in_buffer = 0;
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d->src.super.next_input_byte = nil;
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d->src.skip = 0;
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/* speed up jpeg decoding a bit */
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d->cinfo.dct_method = JDCT_FASTEST;
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d->cinfo.do_fancy_upsampling = FALSE;
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return nil;
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}
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void
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fz_dropdctd(fz_filter *filter)
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{
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fz_dctd *d = (fz_dctd*)filter;
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if (setjmp(d->err.jb)) {
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fprintf(stderr, "ioerror in dct: jpeg_destroy_decompress: %s", d->err.msg);
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return;
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}
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jpeg_destroy_decompress(&d->cinfo);
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}
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fz_error *
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fz_processdctd(fz_filter *filter, fz_buffer *in, fz_buffer *out)
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{
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fz_dctd *d = (fz_dctd*)filter;
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boolean b;
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int i;
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int stride;
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JSAMPROW scanlines[1];
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d->src.buf = in;
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/* skip any bytes left over from myskipinput() */
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if (d->src.skip > 0) {
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if (in->rp + d->src.skip > in->wp) {
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d->src.skip = (in->rp + d->src.skip) - in->wp;
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in->rp = in->wp;
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goto needinput;
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}
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else {
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in->rp += d->src.skip;
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d->src.skip = 0;
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}
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}
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d->src.super.bytes_in_buffer = in->wp - in->rp;
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d->src.super.next_input_byte = in->rp;
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if (setjmp(d->err.jb)) {
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return fz_throw("ioerror in dctd: %s", d->err.msg);
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}
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switch (d->stage)
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{
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case 0:
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i = jpeg_read_header(&d->cinfo, TRUE);
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if (i == JPEG_SUSPENDED)
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goto needinput;
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/* FIXME: default value if ColorTransform is not set */
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if (!d->cinfo.saw_Adobe_marker) {
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switch (d->cinfo.num_components) {
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case 3:
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if (d->colortransform)
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d->cinfo.jpeg_color_space = JCS_YCbCr;
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else
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d->cinfo.jpeg_color_space = JCS_RGB;
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break;
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case 4:
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if (d->colortransform)
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d->cinfo.jpeg_color_space = JCS_YCCK;
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else
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d->cinfo.jpeg_color_space = JCS_CMYK;
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break;
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}
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}
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/* fall through */
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d->stage = 1;
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case 1:
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b = jpeg_start_decompress(&d->cinfo);
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if (b == FALSE)
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goto needinput;
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/* fall through */
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d->stage = 2;
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case 2:
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stride = d->cinfo.output_width * d->cinfo.output_components;
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while (d->cinfo.output_scanline < d->cinfo.output_height)
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{
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if (out->wp + stride > out->ep)
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goto needoutput;
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scanlines[0] = out->wp;
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i = jpeg_read_scanlines(&d->cinfo, scanlines, 1);
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if (i == 0)
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goto needinput;
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out->wp += stride;
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}
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/* fall through */
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d->stage = 3;
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case 3:
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b = jpeg_finish_decompress(&d->cinfo);
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if (b == FALSE)
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goto needinput;
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d->stage = 4;
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out->eof = 1;
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in->rp = in->wp - d->src.super.bytes_in_buffer;
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return fz_iodone;
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}
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needinput:
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in->rp = in->wp - d->src.super.bytes_in_buffer;
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return fz_ioneedin;
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needoutput:
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in->rp = in->wp - d->src.super.bytes_in_buffer;
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return fz_ioneedout;
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}
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