420 lines
11 KiB
C
420 lines
11 KiB
C
#include "mupdf/fitz.h"
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#include <string.h>
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#include <limits.h>
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const char *fz_pclm_write_options_usage =
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"PCLm output options:\n"
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"\tcompression=none: No compression (default)\n"
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"\tcompression=flate: Flate compression\n"
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"\tstrip-height=N: Strip height (default 16)\n"
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"\n";
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/*
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Parse PCLm options.
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Currently defined options and values are as follows:
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compression=none: No compression
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compression=flate: Flate compression
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strip-height=n: Strip height (default 16)
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*/
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fz_pclm_options *
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fz_parse_pclm_options(fz_context *ctx, fz_pclm_options *opts, const char *args)
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{
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const char *val;
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memset(opts, 0, sizeof *opts);
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if (fz_has_option(ctx, args, "compression", &val))
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{
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if (fz_option_eq(val, "none"))
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opts->compress = 0;
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else if (fz_option_eq(val, "flate"))
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opts->compress = 1;
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else
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fz_throw(ctx, FZ_ERROR_GENERIC, "Unsupported PCLm compression %s (none, or flate only)", val);
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}
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if (fz_has_option(ctx, args, "strip-height", &val))
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{
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int i = fz_atoi(val);
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if (i <= 0)
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fz_throw(ctx, FZ_ERROR_GENERIC, "Unsupported PCLm strip height %d (suggest 16)", i);
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opts->strip_height = i;
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}
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return opts;
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}
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void
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fz_write_pixmap_as_pclm(fz_context *ctx, fz_output *out, const fz_pixmap *pixmap, const fz_pclm_options *pclm)
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{
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fz_band_writer *writer;
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if (!pixmap || !out)
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return;
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writer = fz_new_pclm_band_writer(ctx, out, pclm);
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fz_try(ctx)
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{
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fz_write_header(ctx, writer, pixmap->w, pixmap->h, pixmap->n, pixmap->alpha, pixmap->xres, pixmap->yres, 0, pixmap->colorspace, pixmap->seps);
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fz_write_band(ctx, writer, pixmap->stride, pixmap->h, pixmap->samples);
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}
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fz_always(ctx)
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fz_drop_band_writer(ctx, writer);
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fz_catch(ctx)
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fz_rethrow(ctx);
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}
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typedef struct pclm_band_writer_s
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{
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fz_band_writer super;
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fz_pclm_options options;
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int obj_num;
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int xref_max;
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int64_t *xref;
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int pages;
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int page_max;
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int *page_obj;
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unsigned char *stripbuf;
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unsigned char *compbuf;
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size_t complen;
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} pclm_band_writer;
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static int
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new_obj(fz_context *ctx, pclm_band_writer *writer)
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{
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int64_t pos = fz_tell_output(ctx, writer->super.out);
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if (writer->obj_num >= writer->xref_max)
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{
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int new_max = writer->xref_max * 2;
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if (new_max < writer->obj_num + 8)
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new_max = writer->obj_num + 8;
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writer->xref = fz_realloc_array(ctx, writer->xref, new_max, int64_t);
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writer->xref_max = new_max;
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}
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writer->xref[writer->obj_num] = pos;
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return writer->obj_num++;
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}
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static void
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pclm_write_header(fz_context *ctx, fz_band_writer *writer_, fz_colorspace *cs)
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{
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pclm_band_writer *writer = (pclm_band_writer *)writer_;
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fz_output *out = writer->super.out;
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int w = writer->super.w;
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int h = writer->super.h;
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int n = writer->super.n;
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int s = writer->super.s;
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int a = writer->super.alpha;
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int xres = writer->super.xres;
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int yres = writer->super.yres;
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int sh = writer->options.strip_height;
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int strips = (h + sh-1)/sh;
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int i;
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size_t len;
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unsigned char *data;
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fz_buffer *buf = NULL;
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if (a != 0)
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fz_throw(ctx, FZ_ERROR_GENERIC, "PCLm cannot write alpha channel");
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if (s != 0)
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fz_throw(ctx, FZ_ERROR_GENERIC, "PCLm cannot write spot colors");
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if (n != 3 && n != 1)
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fz_throw(ctx, FZ_ERROR_GENERIC, "PCLm expected to be Grayscale or RGB");
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fz_free(ctx, writer->stripbuf);
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fz_free(ctx, writer->compbuf);
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writer->stripbuf = fz_malloc(ctx, w * sh * n);
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writer->complen = fz_deflate_bound(ctx, w * sh * n);
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writer->compbuf = fz_malloc(ctx, writer->complen);
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/* Send the file header on the first page */
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if (writer->pages == 0)
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fz_write_string(ctx, out, "%PDF-1.4\n%PCLm-1.0\n");
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if (writer->page_max <= writer->pages)
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{
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int new_max = writer->page_max * 2;
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if (new_max == 0)
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new_max = writer->pages + 8;
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writer->page_obj = fz_realloc_array(ctx, writer->page_obj, new_max, int);
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writer->page_max = new_max;
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}
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writer->page_obj[writer->pages] = writer->obj_num;
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writer->pages++;
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/* Send the Page Object */
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fz_write_printf(ctx, out, "%d 0 obj\n<<\n/Type /Page\n/Parent 2 0 R\n/Resources <<\n/XObject <<\n", new_obj(ctx, writer));
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for (i = 0; i < strips; i++)
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fz_write_printf(ctx, out, "/Image%d %d 0 R\n", i, writer->obj_num + 1 + i);
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fz_write_printf(ctx, out, ">>\n>>\n/MediaBox[ 0 0 %g %g ]\n/Contents [ %d 0 R ]\n>>\nendobj\n",
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w * 72.0f / xres, h * 72.0f / yres, writer->obj_num);
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/* And the Page contents */
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/* We need the length to this, so write to a buffer first */
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fz_var(buf);
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fz_try(ctx)
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{
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buf = fz_new_buffer(ctx, 0);
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fz_append_printf(ctx, buf, "%g 0 0 %g 0 0 cm\n", 72.0f/xres, 72.0f/yres);
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for (i = 0; i < strips; i++)
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{
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int at = h - (i+1)*sh;
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int this_sh = sh;
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if (at < 0)
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{
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this_sh += at;
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at = 0;
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}
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fz_append_printf(ctx, buf, "/P <</MCID 0>> BDC q\n%d 0 0 %d 0 %d cm\n/Image%d Do Q\n",
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w, this_sh, at, i);
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}
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len = fz_buffer_storage(ctx, buf, &data);
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fz_write_printf(ctx, out, "%d 0 obj\n<<\n/Length %zd\n>>\nstream\n", new_obj(ctx, writer), len);
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fz_write_data(ctx, out, data, len);
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fz_drop_buffer(ctx, buf);
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buf = NULL;
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fz_write_string(ctx, out, "\nendstream\nendobj\n");
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}
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fz_catch(ctx)
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{
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fz_drop_buffer(ctx, buf);
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fz_rethrow(ctx);
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}
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}
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static void
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flush_strip(fz_context *ctx, pclm_band_writer *writer, int fill)
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{
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unsigned char *data = writer->stripbuf;
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fz_output *out = writer->super.out;
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int w = writer->super.w;
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int n = writer->super.n;
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size_t len = w*n*fill;
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/* Buffer is full, compress it and write it. */
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if (writer->options.compress)
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{
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size_t destLen = writer->complen;
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fz_deflate(ctx, writer->compbuf, &destLen, data, len, FZ_DEFLATE_DEFAULT);
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len = destLen;
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data = writer->compbuf;
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}
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fz_write_printf(ctx, out, "%d 0 obj\n<<\n/Width %d\n/ColorSpace /Device%s\n/Height %d\n%s/Subtype /Image\n",
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new_obj(ctx, writer), w, n == 1 ? "Gray" : "RGB", fill, writer->options.compress ? "/Filter /FlateDecode\n" : "");
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fz_write_printf(ctx, out, "/Length %zd\n/Type /XObject\n/BitsPerComponent 8\n>>\nstream\n", len);
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fz_write_data(ctx, out, data, len);
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fz_write_string(ctx, out, "\nendstream\nendobj\n");
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}
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static void
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pclm_write_band(fz_context *ctx, fz_band_writer *writer_, int stride, int band_start, int band_height, const unsigned char *sp)
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{
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pclm_band_writer *writer = (pclm_band_writer *)writer_;
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fz_output *out = writer->super.out;
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int w = writer->super.w;
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int h = writer->super.h;
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int n = writer->super.n;
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int sh = writer->options.strip_height;
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int line;
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if (!out)
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return;
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for (line = 0; line < band_height; line++)
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{
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int dstline = (band_start+line) % sh;
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memcpy(writer->stripbuf + w*n*dstline, sp + line * w*n, w*n);
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if (dstline+1 == sh)
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flush_strip(ctx, writer, dstline+1);
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}
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if (band_start + band_height == h && h % sh != 0)
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flush_strip(ctx, writer, h % sh);
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}
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static void
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pclm_write_trailer(fz_context *ctx, fz_band_writer *writer_)
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{
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}
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static void
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pclm_drop_band_writer(fz_context *ctx, fz_band_writer *writer_)
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{
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pclm_band_writer *writer = (pclm_band_writer *)writer_;
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fz_output *out = writer->super.out;
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int i;
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/* We actually do the trailer writing in the drop */
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if (writer->xref_max > 2)
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{
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int64_t t_pos;
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/* Catalog */
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writer->xref[1] = fz_tell_output(ctx, out);
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fz_write_printf(ctx, out, "1 0 obj\n<<\n/Type /Catalog\n/Pages 2 0 R\n>>\nendobj\n");
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/* Page table */
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writer->xref[2] = fz_tell_output(ctx, out);
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fz_write_printf(ctx, out, "2 0 obj\n<<\n/Count %d\n/Kids [ ", writer->pages);
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for (i = 0; i < writer->pages; i++)
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fz_write_printf(ctx, out, "%d 0 R ", writer->page_obj[i]);
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fz_write_string(ctx, out, "]\n/Type /Pages\n>>\nendobj\n");
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/* Xref */
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t_pos = fz_tell_output(ctx, out);
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fz_write_printf(ctx, out, "xref\n0 %d\n0000000000 65535 f \n", writer->obj_num);
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for (i = 1; i < writer->obj_num; i++)
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fz_write_printf(ctx, out, "%010zd 00000 n \n", writer->xref[i]);
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fz_write_printf(ctx, out, "trailer\n<<\n/Size %d\n/Root 1 0 R\n>>\nstartxref\n%ld\n%%%%EOF\n", writer->obj_num, t_pos);
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}
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fz_free(ctx, writer->stripbuf);
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fz_free(ctx, writer->compbuf);
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fz_free(ctx, writer->page_obj);
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fz_free(ctx, writer->xref);
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}
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fz_band_writer *fz_new_pclm_band_writer(fz_context *ctx, fz_output *out, const fz_pclm_options *options)
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{
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pclm_band_writer *writer = fz_new_band_writer(ctx, pclm_band_writer, out);
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writer->super.header = pclm_write_header;
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writer->super.band = pclm_write_band;
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writer->super.trailer = pclm_write_trailer;
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writer->super.drop = pclm_drop_band_writer;
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if (options)
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writer->options = *options;
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else
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memset(&writer->options, 0, sizeof(writer->options));
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if (writer->options.strip_height == 0)
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writer->options.strip_height = 16;
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writer->obj_num = 3; /* 1 reserved for catalog, 2 for pages tree. */
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return &writer->super;
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}
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void
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fz_save_pixmap_as_pclm(fz_context *ctx, fz_pixmap *pixmap, char *filename, int append, const fz_pclm_options *pclm)
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{
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fz_output *out = fz_new_output_with_path(ctx, filename, append);
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fz_try(ctx)
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{
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fz_write_pixmap_as_pclm(ctx, out, pixmap, pclm);
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fz_close_output(ctx, out);
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}
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fz_always(ctx)
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fz_drop_output(ctx, out);
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fz_catch(ctx)
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fz_rethrow(ctx);
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}
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/* High-level document writer interface */
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typedef struct fz_pclm_writer_s fz_pclm_writer;
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struct fz_pclm_writer_s
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{
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fz_document_writer super;
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fz_draw_options draw;
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fz_pclm_options pclm;
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fz_pixmap *pixmap;
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fz_band_writer *bander;
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fz_output *out;
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int pagenum;
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};
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static fz_device *
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pclm_begin_page(fz_context *ctx, fz_document_writer *wri_, fz_rect mediabox)
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{
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fz_pclm_writer *wri = (fz_pclm_writer*)wri_;
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return fz_new_draw_device_with_options(ctx, &wri->draw, mediabox, &wri->pixmap);
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}
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static void
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pclm_end_page(fz_context *ctx, fz_document_writer *wri_, fz_device *dev)
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{
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fz_pclm_writer *wri = (fz_pclm_writer*)wri_;
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fz_pixmap *pix = wri->pixmap;
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fz_try(ctx)
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{
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fz_close_device(ctx, dev);
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fz_write_header(ctx, wri->bander, pix->w, pix->h, pix->n, pix->alpha, pix->xres, pix->yres, wri->pagenum++, pix->colorspace, pix->seps);
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fz_write_band(ctx, wri->bander, pix->stride, pix->h, pix->samples);
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}
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fz_always(ctx)
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{
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fz_drop_device(ctx, dev);
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fz_drop_pixmap(ctx, pix);
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wri->pixmap = NULL;
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}
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fz_catch(ctx)
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fz_rethrow(ctx);
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}
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static void
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pclm_close_writer(fz_context *ctx, fz_document_writer *wri_)
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{
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fz_pclm_writer *wri = (fz_pclm_writer*)wri_;
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fz_drop_band_writer(ctx, wri->bander);
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wri->bander = NULL;
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fz_close_output(ctx, wri->out);
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}
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static void
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pclm_drop_writer(fz_context *ctx, fz_document_writer *wri_)
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{
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fz_pclm_writer *wri = (fz_pclm_writer*)wri_;
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fz_drop_pixmap(ctx, wri->pixmap);
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fz_drop_output(ctx, wri->out);
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fz_drop_band_writer(ctx, wri->bander);
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}
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fz_document_writer *
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fz_new_pclm_writer_with_output(fz_context *ctx, fz_output *out, const char *options)
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{
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fz_pclm_writer *wri = fz_new_derived_document_writer(ctx, fz_pclm_writer, pclm_begin_page, pclm_end_page, pclm_close_writer, pclm_drop_writer);
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fz_try(ctx)
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{
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fz_parse_draw_options(ctx, &wri->draw, options);
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fz_parse_pclm_options(ctx, &wri->pclm, options);
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wri->out = out;
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wri->bander = fz_new_pclm_band_writer(ctx, wri->out, &wri->pclm);
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}
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fz_catch(ctx)
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{
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fz_free(ctx, wri);
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fz_rethrow(ctx);
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}
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return (fz_document_writer*)wri;
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}
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fz_document_writer *
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fz_new_pclm_writer(fz_context *ctx, const char *path, const char *options)
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{
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fz_output *out = fz_new_output_with_path(ctx, path ? path : "out.pclm", 0);
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fz_document_writer *wri = NULL;
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fz_try(ctx)
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wri = fz_new_pclm_writer_with_output(ctx, out, options);
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fz_catch(ctx)
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{
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fz_drop_output(ctx, out);
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fz_rethrow(ctx);
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}
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return wri;
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}
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