1 files changed, 129 insertions, 0 deletions
diff --git a/docs/examples/example.c b/docs/examples/example.c
new file mode 100644
index 00000000..1bf67635
--- /dev/null
+++ b/docs/examples/example.c
@@ -0,0 +1,129 @@
+/*
+	How to use MuPDF to render a single page and print the result as a PPM to stdout.
+
+	Build the mupdf library using make, then either run 'make examples' or
+	compile the example manually:
+
+	gcc -Iinclude -o example.exe docs/example.c \
+		build/debug/libmupdf.a \
+		build/debug/libmupdfthird.a
+		-lcrypto \
+		-lm
+
+	./example.exe document.pdf 100 0 1
+*/
+
+#include <mupdf/fitz.h>
+
+int main(int argc, char **argv)
+{
+	char *input;
+	float zoom, rotate;
+	int page_number, page_count;
+	fz_context *ctx;
+	fz_document *doc;
+	fz_pixmap *pix;
+	fz_matrix ctm;
+	int x, y;
+
+	if (argc < 3)
+	{
+		fprintf(stderr, "usage: example input-file page-number [ zoom [ rotate ] ]\n");
+		fprintf(stderr, "\tinput-file: path of PDF, XPS, CBZ or EPUB document to open\n");
+		fprintf(stderr, "\tPage numbering starts from one.\n");
+		fprintf(stderr, "\tZoom level is in percent (100 percent is 72 dpi).\n");
+		fprintf(stderr, "\tRotation is in degrees clockwise.\n");
+		return EXIT_FAILURE;
+	}
+
+	input = argv[1];
+	page_number = atoi(argv[2]) - 1;
+	zoom = argc > 3 ? atof(argv[3]) : 100;
+	rotate = argc > 4 ? atof(argv[4]) : 0;
+
+	/* Create a context to hold the exception stack and various caches. */
+	ctx = fz_new_context(NULL, NULL, FZ_STORE_UNLIMITED);
+	if (!ctx)
+	{
+		fprintf(stderr, "cannot create mupdf context\n");
+		return EXIT_FAILURE;
+	}
+
+	/* Register the default file types to handle. */
+	fz_try(ctx)
+		fz_register_document_handlers(ctx);
+	fz_catch(ctx)
+	{
+		fprintf(stderr, "cannot register document handlers: %s\n", fz_caught_message(ctx));
+		fz_drop_context(ctx);
+		return EXIT_FAILURE;
+	}
+
+	/* Open the document. */
+	fz_try(ctx)
+		doc = fz_open_document(ctx, input);
+	fz_catch(ctx)
+	{
+		fprintf(stderr, "cannot open document: %s\n", fz_caught_message(ctx));
+		fz_drop_context(ctx);
+		return EXIT_FAILURE;
+	}
+
+	/* Count the number of pages. */
+	fz_try(ctx)
+		page_count = fz_count_pages(ctx, doc);
+	fz_catch(ctx)
+	{
+		fprintf(stderr, "cannot count number of pages: %s\n", fz_caught_message(ctx));
+		fz_drop_document(ctx, doc);
+		fz_drop_context(ctx);
+		return EXIT_FAILURE;
+	}
+
+	if (page_number < 0 || page_number >= page_count)
+	{
+		fprintf(stderr, "page number out of range: %d (page count %d)\n", page_number + 1, page_count);
+		fz_drop_document(ctx, doc);
+		fz_drop_context(ctx);
+		return EXIT_FAILURE;
+	}
+
+	/* Compute a transformation matrix for the zoom and rotation desired. */
+	/* The default resolution without scaling is 72 dpi. */
+	fz_scale(&ctm, zoom / 100, zoom / 100);
+	fz_pre_rotate(&ctm, rotate);
+
+	/* Render page to an RGB pixmap. */
+	fz_try(ctx)
+		pix = fz_new_pixmap_from_page_number(ctx, doc, page_number, &ctm, fz_device_rgb(ctx), 0);
+	fz_catch(ctx)
+	{
+		fprintf(stderr, "cannot render page: %s\n", fz_caught_message(ctx));
+		fz_drop_document(ctx, doc);
+		fz_drop_context(ctx);
+		return EXIT_FAILURE;
+	}
+
+	/* Print image data in ascii PPM format. */
+	printf("P3\n");
+	printf("%d %d\n", pix->w, pix->h);
+	printf("255\n");
+	for (y = 0; y < pix->h; ++y)
+	{
+		unsigned char *p = &pix->samples[y * pix->stride];
+		for (x = 0; x < pix->w; ++x)
+		{
+			if (x > 0)
+				printf("  ");
+			printf("%3d %3d %3d", p[0], p[1], p[2]);
+			p += pix->n;
+		}
+		printf("\n");
+	}
+
+	/* Clean up. */
+	fz_drop_pixmap(ctx, pix);
+	fz_drop_document(ctx, doc);
+	fz_drop_context(ctx);
+	return EXIT_SUCCESS;
+}