From adb610d22582f0598f6e5c699c08e7495767de28 Mon Sep 17 00:00:00 2001

From: Marek Kasik <mkasik@redhat.com>

Date: Wed, 7 Jan 2015 18:35:16 +0100

Subject: [PATCH] Rotate documents correctly

Rotate result of rendering given by ghostscript.

https://bugs.freedesktop.org/show_bug.cgi?id=76450

---

 libspectre/spectre-device.c | 97 ++++++++++++++++++++++++++++++++++++++++++++-

 1 file changed, 95 insertions(+), 2 deletions(-)

diff --git a/libspectre/spectre-device.c b/libspectre/spectre-device.c

index a527d86..537f337 100644

--- a/libspectre/spectre-device.c

+++ b/libspectre/spectre-device.c

@@ -99,7 +99,7 @@ spectre_sync (void *handle, void *device)

 }

 static int

-spectre_page (void *handle, void * device, int copies, int flush)

+spectre_page (void *handle, void *device, int copies, int flush)

 {

 	SpectreDevice *sd;

@@ -162,6 +162,33 @@ spectre_device_new (struct document *doc)

 	return device;

 }

+#define PIXEL_SIZE 4

+#define ROW_ALIGN 32

+

+static void

+swap_pixels (unsigned char *data,

+             size_t         pixel_a_start,

+             size_t         pixel_b_start)

+{

+	unsigned char value;

+	size_t        i;

+

+	for (i = 0; i < PIXEL_SIZE; i++) {

+		value = data[pixel_a_start + i];

+		data[pixel_a_start + i] = data[pixel_b_start + i];

+		data[pixel_b_start + i] = value;

+	}

+}

+

+static void

+copy_pixel (unsigned char *dest,

+            unsigned char *src,

+            size_t         dest_pixel_start,

+            size_t         src_pixel_start)

+{

+	memcpy (dest + dest_pixel_start, src + src_pixel_start, PIXEL_SIZE);

+}

+

 SpectreStatus

 spectre_device_render (SpectreDevice        *device,

 		       unsigned int          page,

@@ -185,6 +212,10 @@ spectre_device_render (SpectreDevice        *device,

 	char      *dsp_format, *dsp_handle;

 	char      *width_points = NULL;

 	char      *height_points = NULL;

+	unsigned char *user_image;

+	size_t         stride, padding;

+	int            i, j;

+

 	gs = spectre_gs_new ();

 	if (!gs)

@@ -277,7 +308,7 @@ spectre_device_render (SpectreDevice        *device,

 	}

 	set = _spectre_strdup_printf ("<< /Orientation %d >> setpagedevice .locksafe",

-				      rc->orientation);

+				      SPECTRE_ORIENTATION_PORTRAIT);

 	if (!spectre_gs_send_string (gs, set)) {

 		free (set);

 		spectre_gs_free (gs);

@@ -293,6 +324,68 @@ spectre_device_render (SpectreDevice        *device,

 	*page_data = device->user_image;

 	*row_length = device->row_length;

+	switch (rc->orientation)

+	  {

+	    default:

+	    case SPECTRE_ORIENTATION_PORTRAIT:

+	      break;

+	    case SPECTRE_ORIENTATION_REVERSE_PORTRAIT:

+		for (j = 0; j < height / 2; ++j) {

+			for (i = 0; i < width; ++i) {

+				swap_pixels (device->user_image,

+				             device->row_length * j + PIXEL_SIZE * i,

+				             device->row_length * (height - 1 - j) + PIXEL_SIZE * (width - 1 - i));

+			}

+		}

+		if (height % 2 == 1) {

+			for (i = 0; i < width / 2; ++i) {

+				swap_pixels (device->user_image,

+				             device->row_length * (height / 2) + PIXEL_SIZE * i,

+				             device->row_length * (height - 1 - height / 2) + PIXEL_SIZE * (width - 1 - i));

+			}

+		}

+	      break;

+	    case SPECTRE_ORIENTATION_LANDSCAPE:

+	    case SPECTRE_ORIENTATION_REVERSE_LANDSCAPE:

+		if (height % ROW_ALIGN > 0) {

+			padding = (ROW_ALIGN - height % ROW_ALIGN) * PIXEL_SIZE;

+			stride = height * PIXEL_SIZE + padding;

+			user_image = malloc (width * stride);

+

+			for (j = 0; j < width; ++j)

+				memset (user_image + j * stride + stride - padding, 0, padding);

+		}

+		else {

+			stride = height * PIXEL_SIZE;

+			user_image = malloc (width * stride);

+		}

+

+		if (rc->orientation == SPECTRE_ORIENTATION_LANDSCAPE) {

+			for (j = 0; j < height; ++j) {

+				for (i = 0; i < width; ++i) {

+					copy_pixel (user_image,

+						    device->user_image,

+						    stride * i + PIXEL_SIZE * (height - 1 - j),

+						    device->row_length * j + PIXEL_SIZE * i);

+				}

+			}

+		} else {

+			for (j = 0; j < height; ++j) {

+				for (i = 0; i < width; ++i) {

+					copy_pixel (user_image,

+						    device->user_image,

+						    stride * (width - 1 - i) + PIXEL_SIZE * j,

+						    device->row_length * j + PIXEL_SIZE * i);

+				}

+			}

+		}

+

+		free (device->user_image);

+		*page_data = user_image;

+		*row_length = stride;

+	      break;

+	  }

+

 	spectre_gs_free (gs);

 	return SPECTRE_STATUS_SUCCESS;

-- 

2.1.0