Add detection for libjasper, used by the gdk-pixbuf JPEG2000 loader

2007-11-25  Bastien Nocera  <hadess@hadess.net>

	* configure.in: Add detection for libjasper, used by the
	gdk-pixbuf JPEG2000 loader

2007-11-25  Bastien Nocera  <hadess@hadess.net>

	* Makefile.am:
	* io-jasper.c: Add the libjasper JPEG2000 loader
	(Closes: #469901)


svn path=/trunk/; revision=19042

1 files changed, 305 insertions, 0 deletions

diff --git a/gdk-pixbuf/io-jasper.c b/gdk-pixbuf/io-jasper.c
new file mode 100644
index 000000000..5194ebd00
--- /dev/null
+++ b/gdk-pixbuf/io-jasper.c
@@ -0,0 +1,305 @@
+/* JPEG 2000 loader
+ *
+ * Copyright (c) 2007 Bastien Nocera <hadess@hadess.net>
+ * Inspired by work by Ben Karel <web+moz@eschew.org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#include "gdk-pixbuf-private.h"
+#include "gdk-pixbuf-io.h"
+
+#include <jasper/jasper.h>
+
+G_MODULE_EXPORT void fill_vtable (GdkPixbufModule * module);
+G_MODULE_EXPORT void fill_info (GdkPixbufFormat * info);
+
+struct jasper_context {
+	GdkPixbuf *pixbuf;
+
+	GdkPixbufModuleSizeFunc size_func;
+	GdkPixbufModuleUpdatedFunc updated_func;
+	GdkPixbufModulePreparedFunc prepared_func;
+	gpointer user_data;
+
+	jas_stream_t *stream;
+
+	int width, height;
+};
+
+static void
+free_jasper_context (struct jasper_context *context)
+{
+	if (!context)
+		return;
+
+	if (context->stream) {
+		jas_stream_close (context->stream);
+		context->stream = NULL;
+	}
+
+	g_free (context);
+}
+
+static gpointer
+jasper_image_begin_load (GdkPixbufModuleSizeFunc size_func,
+			 GdkPixbufModulePreparedFunc prepared_func,
+			 GdkPixbufModuleUpdatedFunc updated_func,
+			 gpointer user_data, GError **error)
+{
+	struct jasper_context *context;
+	jas_stream_t *stream;
+
+	jas_init ();
+
+	stream = jas_stream_memopen (NULL, -1);
+	if (!stream) {
+		g_set_error (error, GDK_PIXBUF_ERROR, GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY, _("Couldn't allocate memory for stream"));
+		return NULL;
+	}
+
+	context = g_new0 (struct jasper_context, 1);
+	if (!context)
+		return NULL;
+
+	context->size_func = size_func;
+	context->updated_func = updated_func;
+	context->prepared_func = prepared_func;
+	context->user_data = user_data;
+	context->width = context->height = -1;
+
+	context->stream = stream;
+
+	return context;
+}
+
+static gboolean
+jasper_image_try_load (struct jasper_context *context, GError **error)
+{
+	jas_image_t *raw_image, *image;
+	int num_components, colourspace_family;
+	int i, rowstride, shift;
+	guchar *pixels;
+
+	raw_image = jas_image_decode (context->stream, -1, 0);
+	if (!raw_image) {
+		g_set_error (error, GDK_PIXBUF_ERROR, GDK_PIXBUF_ERROR_CORRUPT_IMAGE, _("Couldn't decode image"));
+		return FALSE;
+	}
+
+	if (context->width == -1 && context->height == -1) {
+		int width, height;
+
+		context->width = width = jas_image_cmptwidth (raw_image, 0);
+		context->height = height = jas_image_cmptheight (raw_image, 0);
+
+		if (context->size_func) {
+			(*context->size_func) (&width, &height, context->user_data);
+
+			if (width == 0 || height == 0) {
+				jas_image_destroy(raw_image);
+				g_set_error (error,
+					     GDK_PIXBUF_ERROR,
+					     GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
+					     _("Transformed JPEG2000 has zero width or height"));
+				return FALSE;
+			}
+		}
+	}
+
+	/* We only know how to handle grayscale and RGB images */
+	num_components = jas_image_numcmpts (raw_image);
+	colourspace_family = jas_clrspc_fam (jas_image_clrspc (raw_image));
+
+	if ((num_components != 3 && num_components != 4 && num_components != 1) ||
+	    (colourspace_family != JAS_CLRSPC_FAM_RGB  && colourspace_family != JAS_CLRSPC_FAM_GRAY)) {
+	    	jas_image_destroy (raw_image);
+		g_set_error (error, GDK_PIXBUF_ERROR, GDK_PIXBUF_ERROR_UNKNOWN_TYPE, _("Image type currently not supported"));
+		return FALSE;
+	}
+
+	/* Apply the colour profile to the image, creating a new one */
+	if (jas_image_clrspc (raw_image) != JAS_CLRSPC_SRGB) {
+		jas_cmprof_t *profile;
+
+		profile = jas_cmprof_createfromclrspc (JAS_CLRSPC_SRGB);
+		if (!profile) {
+			jas_image_destroy (raw_image);
+			g_set_error (error, GDK_PIXBUF_ERROR, GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY, _("Couldn't allocate memory for color profile"));
+			return FALSE;
+		}
+
+		image = jas_image_chclrspc (raw_image, profile, JAS_CMXFORM_INTENT_PER);
+		if (!image) {
+			jas_image_destroy (raw_image);
+			g_set_error (error, GDK_PIXBUF_ERROR, GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY, _("Couldn't allocate memory for color profile"));
+			return FALSE;
+		}
+	} else {
+		image = raw_image;
+	}
+
+	if (!context->pixbuf) {
+		int bits_per_sample;
+		guchar *data;
+
+		/* Unfortunately, gdk-pixbuf doesn't support 16 bpp images
+		 * bits_per_sample = jas_image_cmptprec (image, 0);
+		if (bits_per_sample < 8)
+			bits_per_sample = 8;
+		else if (bits_per_sample > 8)
+			bits_per_sample = 16;
+		*/
+		bits_per_sample = 8;
+
+		data = g_try_malloc0 (context->width * context->height * bits_per_sample / 8);
+		if (data == NULL) {
+			g_set_error (error,
+				     GDK_PIXBUF_ERROR,
+				     GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY,
+				     _("Insufficient memory to open JPEG 2000 file"));
+			return FALSE;
+		}
+		context->pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB,
+						  FALSE, bits_per_sample,
+						  context->width, context->height);
+		if (context->prepared_func)
+			context->prepared_func (context->pixbuf, NULL, context->user_data);
+	}
+
+	/* We calculate how much we should shift the pixel
+	 * data by to make it fit into our pixbuf */
+	shift = MAX (jas_image_cmptprec (image, 0) - gdk_pixbuf_get_bits_per_sample (context->pixbuf), 0);
+
+	/* Loop over the 3 colourspaces */
+	rowstride = gdk_pixbuf_get_rowstride (context->pixbuf);
+	pixels = gdk_pixbuf_get_pixels (context->pixbuf);
+
+	for (i = 0; i < num_components; i++) {
+		jas_matrix_t *matrix;
+		int j;
+
+		matrix = jas_matrix_create (context->height, context->width);
+
+		/* in libjasper, R is 0, G is 1, etc. we're lucky :)
+		 * but we need to handle the "opacity" channel ourselves */
+		if (i != 4) {
+			jas_image_readcmpt (image, i, 0, 0, context->width, context->height, matrix);
+		} else {
+			jas_image_readcmpt (image, JAS_IMAGE_CT_OPACITY, 0, 0, context->width, context->height, matrix);
+		}
+
+		for (j = 0; j < context->height; j++) {
+			int k;
+
+			for (k = 0; k < context->width; k++) {
+				if (num_components == 3 || num_components == 4) {
+					pixels[j * rowstride + k * 3 + i] = jas_matrix_get (matrix, j, k) >> shift;
+				} else {
+					pixels[j * rowstride + k * 3] =
+						pixels[j * rowstride + k * 3 + 1] =
+						pixels[j * rowstride + k * 3 + 2] = jas_matrix_get (matrix, j, k) >> shift;
+				}
+			}
+			/* Update once per line for the last component, otherwise
+			 * we might contain garbage */
+			if (context->updated_func && (i == num_components - 1) && k != 0) {
+				context->updated_func (context->pixbuf, 0, j, k, 1, context->user_data);
+			}
+		}
+
+		jas_matrix_destroy (matrix);
+	}
+
+	if (image != raw_image)
+		jas_image_destroy (image);
+	jas_image_destroy (raw_image);
+
+	return TRUE;
+}
+
+static gboolean
+jasper_image_stop_load (gpointer data, GError **error)
+{
+	struct jasper_context *context = (struct jasper_context *) data;
+	gboolean ret;
+
+	jas_stream_rewind (context->stream);
+	ret = jasper_image_try_load (context, error);
+
+	free_jasper_context (context);
+
+	return ret;
+}
+
+static gboolean
+jasper_image_load_increment (gpointer data, const guchar *buf, guint size, GError **error)
+{
+	struct jasper_context *context = (struct jasper_context *) data;
+
+	if (jas_stream_write (context->stream, buf, size) < 0) {
+		g_set_error (error, GDK_PIXBUF_ERROR, GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY, _("Couldn't allocate memory to buffer image data"));
+		return FALSE;
+	}
+
+	return TRUE;
+}
+
+void
+fill_vtable (GdkPixbufModule * module)
+{
+	module->begin_load = jasper_image_begin_load;
+	module->stop_load = jasper_image_stop_load;
+	module->load_increment = jasper_image_load_increment;
+}
+
+void
+fill_info (GdkPixbufFormat * info)
+{
+	static GdkPixbufModulePattern signature[] = {
+		{ "    jP", "!!!!  ", 100 },		/* file begins with 'jP' at offset 4 */
+		{ "\xff\x4f\xff\x51\x00", NULL, 100 },	/* file starts with FF 4F FF 51 00 */
+		{ NULL, NULL, 0 }
+	};
+	static gchar *mime_types[] = {
+		"image/jp2",
+		"image/jpeg2000",
+		"image/jpx",
+		NULL
+	};
+	static gchar *extensions[] = {
+		"jp2",
+		"jpc",
+		"jpx",
+		"j2k",
+		"jpf",
+		NULL
+	};
+
+	info->name = "jpeg2000";
+	info->signature = signature;
+	info->description = N_("The JPEG 2000 image format");
+	info->mime_types = mime_types;
+	info->extensions = extensions;
+	info->flags = GDK_PIXBUF_FORMAT_THREADSAFE;
+	info->license = "LGPL";
+	info->disabled = FALSE;
+}
+