Code to generate a GProof file from a currently opened document.

Given a document, generate a gproof file from it. This encapsulates
the name of the file, the desired resolution for proofing, and the
page dimensions of all the pages in the file.

The idea is that an app will call this when it is asked to go into
'proofing' mode, and will reinvoke itself on this file. This gives
the gprf document handler just enough information to fake up a
document of n pages of the required sizes. Each page will then be
autogenerated on demand.

2 files changed, 63 insertions, 2 deletions

diff --git a/source/gprf/gprf-doc.c b/source/gprf/gprf-doc.c
index d9cd2938..bcd631ad 100644
--- a/source/gprf/gprf-doc.c
+++ b/source/gprf/gprf-doc.c
@@ -215,7 +215,7 @@ static inline unsigned char *cmyk_to_rgba(unsigned char *out, uint32_t c, uint32
 	g += (CONST16(0.2119) * x)>>16;
 	b += (CONST16(0.2235) * x)>>16;
 #else
-	k = 63356 - k;
+	k = 65536 - k;
 	r = k - c;
 	g = k - m;
 	b = k - y;
@@ -275,7 +275,7 @@ gprf_get_pixmap(fz_context *ctx, fz_image *image_, int w, int h, int *l2factor)
 
 	fz_try(ctx)
 	{
-		/* First off, figure out of we are doing RGB or separations
+		/* First off, figure out if we are doing RGB or separations
 		 * decoding. */
 		num_seps = 3 + fz_count_separations(ctx, image->separations);
 		if (fz_separations_all_enabled(ctx, image->separations))
diff --git a/source/gprf/gprf-skeleton.c b/source/gprf/gprf-skeleton.c
new file mode 100644
index 00000000..e17c3e21
--- /dev/null
+++ b/source/gprf/gprf-skeleton.c
@@ -0,0 +1,61 @@
+#include "mupdf/fitz.h"
+
+void
+fz_write_gproof_file(fz_context *ctx, const char *pdf_file, fz_document *doc, const char *filename, int res)
+{
+	int i;
+	int num_pages = fz_count_pages(ctx, doc);
+	fz_output *out;
+	fz_page *page = NULL;
+
+	fz_var(page);
+	
+	if (num_pages <= 0)
+		fz_throw(ctx, FZ_ERROR_GENERIC, "Cannot write a 0 page GProof skeleton file");
+
+	out = fz_new_output_to_filename(ctx, filename);
+
+	fz_try(ctx)
+	{
+		/* File Signature: GPRO */
+		fz_write_int32le(ctx, out, 0x4f525047);
+
+		/* Version = 1 */
+		fz_write_byte(ctx, out, 1);
+		fz_write_byte(ctx, out, 0);
+
+		/* Resolution */
+		fz_write_int32le(ctx, out, res);
+
+		/* Num Pages */
+		fz_write_int32le(ctx, out, num_pages);
+
+		for (i = 0; i < num_pages; i++)
+		{
+			fz_rect rect;
+			int w, h;
+
+			page = fz_load_page(ctx, doc, i);
+			fz_bound_page(ctx, page, &rect);
+			fz_drop_page(ctx, page);
+			page = NULL;
+
+			w = (int)((rect.x1 - rect.x0) * res / 72.0 + 0.5);
+			h = (int)((rect.y1 - rect.y0) * res / 72.0 + 0.5);
+			fz_write_int32le(ctx, out, w);
+			fz_write_int32le(ctx, out, h);
+		}
+
+		/* Filename */
+		fz_write(ctx, out, pdf_file, strlen(pdf_file)+1);
+	}
+	fz_always(ctx)
+	{
+		fz_drop_page(ctx, page);
+		fz_drop_output(ctx, out);
+	}
+	fz_catch(ctx)
+	{
+		fz_rethrow(ctx);
+	}
+}