From b8efb1cf3ce4c57fd4a0396c2a9102630d3d6e36 Mon Sep 17 00:00:00 2001
From: Tor Andersson <tor.andersson@artifex.com>
Date: Tue, 22 Mar 2011 18:26:07 +0100
Subject: xps: import ghostxps source
---
xps/xpsjpeg.c | 143 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 143 insertions(+)
create mode 100644 xps/xpsjpeg.c
(limited to 'xps/xpsjpeg.c')
diff --git a/xps/xpsjpeg.c b/xps/xpsjpeg.c
new file mode 100644
index 00000000..878fd85a
--- /dev/null
+++ b/xps/xpsjpeg.c
@@ -0,0 +1,143 @@
+/* Copyright (C) 2006-2010 Artifex Software, Inc.
+ All Rights Reserved.
+
+ This software is provided AS-IS with no warranty, either express or
+ implied.
+
+ This software is distributed under license and may not be copied, modified
+ or distributed except as expressly authorized under the terms of that
+ license. Refer to licensing information at http://www.artifex.com/
+ or contact Artifex Software, Inc., 7 Mt. Lassen Drive - Suite A-134,
+ San Rafael, CA 94903, U.S.A., +1(415)492-9861, for further information.
+*/
+
+/* XPS interpreter - JPEG image support */
+
+#include "ghostxps.h"
+
+#include "stream.h"
+#include "strimpl.h"
+#include "gsstate.h"
+#include "jpeglib_.h"
+#include "sdct.h"
+#include "sjpeg.h"
+
+static int
+xps_report_error(stream_state * st, const char *str)
+{
+ (void) gs_throw1(-1, "%s", str);
+ return 0;
+}
+
+int
+xps_decode_jpeg(xps_context_t *ctx, byte *rbuf, int rlen, xps_image_t *image)
+{
+ jpeg_decompress_data jddp;
+ stream_DCT_state state;
+ stream_cursor_read rp;
+ stream_cursor_write wp;
+ int code;
+ int wlen;
+ byte *wbuf;
+ jpeg_saved_marker_ptr curr_marker;
+
+ s_init_state((stream_state*)&state, &s_DCTD_template, ctx->memory);
+ state.report_error = xps_report_error;
+
+ s_DCTD_template.set_defaults((stream_state*)&state);
+
+ state.jpeg_memory = ctx->memory;
+ state.data.decompress = &jddp;
+
+ jddp.template = s_DCTD_template;
+ jddp.memory = ctx->memory;
+ jddp.scanline_buffer = NULL;
+
+ if ((code = gs_jpeg_create_decompress(&state)) < 0)
+ return gs_throw(-1, "cannot gs_jpeg_create_decompress");
+
+ s_DCTD_template.init((stream_state*)&state);
+
+ rp.ptr = rbuf - 1;
+ rp.limit = rbuf + rlen - 1;
+
+ /* read the header only by not having a write buffer */
+ wp.ptr = 0;
+ wp.limit = 0;
+
+ /* Set up to save the ICC marker APP2.
+ * According to the spec we should be getting APP1 APP2 and APP13.
+ * Library gets APP0 and APP14. */
+ jpeg_save_markers(&(jddp.dinfo), 0xe2, 0xFFFF);
+
+ code = s_DCTD_template.process((stream_state*)&state, &rp, &wp, true);
+ if (code != 1)
+ return gs_throw(-1, "premature EOF or error in jpeg");
+
+ /* Check if we had an ICC profile */
+ curr_marker = jddp.dinfo.marker_list;
+ while (curr_marker != NULL)
+ {
+ if (curr_marker->marker == 0xe2)
+ {
+ /* Found ICC profile. Create a buffer and copy over now.
+ * Strip JPEG APP2 14 byte header */
+ image->profilesize = curr_marker->data_length - 14;
+ image->profile = xps_alloc(ctx, image->profilesize);
+ if (image->profile)
+ {
+ /* If we can't create it, just ignore */
+ memcpy(image->profile, &(curr_marker->data[14]), image->profilesize);
+ }
+ break;
+ }
+ curr_marker = curr_marker->next;
+ }
+
+ image->width = jddp.dinfo.output_width;
+ image->height = jddp.dinfo.output_height;
+ image->comps = jddp.dinfo.output_components;
+ image->bits = 8;
+ image->stride = image->width * image->comps;
+
+ if (image->comps == 1)
+ image->colorspace = ctx->gray;
+ if (image->comps == 3)
+ image->colorspace = ctx->srgb;
+ if (image->comps == 4)
+ image->colorspace = ctx->cmyk;
+
+ if (jddp.dinfo.density_unit == 1)
+ {
+ image->xres = jddp.dinfo.X_density;
+ image->yres = jddp.dinfo.Y_density;
+ }
+ else if (jddp.dinfo.density_unit == 2)
+ {
+ image->xres = jddp.dinfo.X_density * 2.54;
+ image->yres = jddp.dinfo.Y_density * 2.54;
+ }
+ else
+ {
+ image->xres = 96;
+ image->yres = 96;
+ }
+
+ wlen = image->stride * image->height;
+ wbuf = xps_alloc(ctx, wlen);
+ if (!wbuf)
+ return gs_throw1(-1, "out of memory allocating samples: %d", wlen);
+
+ image->samples = wbuf;
+
+ wp.ptr = wbuf - 1;
+ wp.limit = wbuf + wlen - 1;
+
+ code = s_DCTD_template.process((stream_state*)&state, &rp, &wp, true);
+ if (code != EOFC)
+ return gs_throw1(-1, "error in jpeg (code = %d)", code);
+
+ gs_jpeg_destroy(&state);
+
+ return gs_okay;
+}
--
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