WebP image support, needs libwebp (from trunk/libwebp) and libvpx.

Only enabled for Amiga build currently, may have colour issues on little-endian CPUs

svn path=/trunk/netsurf/; revision=10860

2 files changed, 184 insertions, 0 deletions

diff --git a/image/webp.c b/image/webp.c
new file mode 100644
index 000000000..7df6ccf35
--- /dev/null
+++ b/image/webp.c
@@ -0,0 +1,137 @@
+ /*
+ * Copyright 2010 Chris Young <chris@unsatisfactorysoftware.co.uk>
+ *
+ * This file is part of NetSurf, http://www.netsurf-browser.org/
+ *
+ * NetSurf is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * NetSurf 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/** \file
+ * Content for image/webp (libwebp implementation).
+ *
+ */
+
+#include "utils/config.h"
+#ifdef WITH_WEBP
+
+#include <assert.h>
+#include <string.h>
+#include <stdlib.h>
+#include <webpimg.h>
+#include "desktop/plotters.h"
+#include "image/bitmap.h"
+#include "content/content_protected.h"
+#include "utils/log.h"
+#include "utils/messages.h"
+#include "utils/utils.h"
+
+/**
+ * Convert a CONTENT_WEBP for display.
+ *
+ * No conversion is necessary. We merely read the WebP dimensions.
+ */
+
+bool webp_convert(struct content *c)
+{
+	union content_msg_data msg_data;
+	const char *data;
+	unsigned long size;
+	uint8 *Y = NULL, *U = NULL, *V = NULL;
+	uint32 width = 0, height = 0;
+	char title[100];
+	WebPResult res = webp_success;
+
+	data = content__get_source_data(c, &size);
+
+	res = WebPDecode(data, size, &Y, &U, &V, &width, &height);
+	if (res != webp_success) {
+		msg_data.error = messages_get("NoMemory");
+		content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
+		if(Y) free(Y);
+		return false;
+	}
+
+	c->bitmap = bitmap_create(width, height, BITMAP_NEW | BITMAP_OPAQUE);
+	if (!c->bitmap) {
+		msg_data.error = messages_get("NoMemory");
+		content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
+		if(Y) free(Y);
+		return false;
+	}
+	unsigned char* imagebuf = bitmap_get_buffer(c->bitmap);
+	if (!imagebuf) {
+		msg_data.error = messages_get("NoMemory");
+		content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
+		if(Y) free(Y);
+		return false;
+	}
+	unsigned int row_width = bitmap_get_rowstride(c->bitmap) / 4;
+
+	YUV420toRGBA(Y, U, V, row_width, width, height, imagebuf);
+
+	if(Y) free(Y);
+
+	/* I think we may need to reverse the byte order here, as it is fixed
+	 * to RGBA on both big- and little-endian platforms. */
+
+	c->width = width;
+	c->height = height;
+	snprintf(title, sizeof(title), messages_get("WebPTitle"),
+		width, height, size);
+	content__set_title(c, title);
+
+	bitmap_modified(c->bitmap);
+	c->status = CONTENT_STATUS_DONE;
+
+	return true;
+}
+
+
+/**
+ * Destroy a CONTENT_WEBP and free all resources it owns.
+ */
+
+void webp_destroy(struct content *c)
+{
+	if (c->bitmap != NULL)
+		bitmap_destroy(c->bitmap);
+}
+
+
+/**
+ * Redraw a CONTENT_WEBP.
+ */
+
+bool webp_redraw(struct content *c, int x, int y,
+		int width, int height,
+		int clip_x0, int clip_y0, int clip_x1, int clip_y1,
+		float scale, colour background_colour)
+{
+	return plot.bitmap(x, y, width, height,
+			c->bitmap, background_colour, BITMAPF_NONE);
+}
+
+
+bool webp_clone(const struct content *old, struct content *new_content)
+{
+	/* Simply replay convert */
+	if (old->status == CONTENT_STATUS_READY ||
+			old->status == CONTENT_STATUS_DONE) {
+		if (webp_convert(new_content) == false)
+			return false;
+	}
+
+	return true;
+}
+
+#endif
diff --git a/image/webp.h b/image/webp.h
new file mode 100644
index 000000000..5ff38c900
--- /dev/null
+++ b/image/webp.h
@@ -0,0 +1,47 @@
+/*
+ * Copyright 2010 Chris Young <chris@unsatisfactorysoftware.co.uk>
+ *
+ * This file is part of NetSurf, http://www.netsurf-browser.org/
+ *
+ * NetSurf is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * NetSurf 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/** \file
+ * Content for image/webp (libwebp interface).
+ */
+
+#ifndef _NETSURF_WEBP_H_
+#define _NETSURF_WEBP_H_
+
+#include "utils/config.h"
+#ifdef WITH_WEBP
+
+#include <stdbool.h>
+
+struct content;
+
+struct content_webp_data {
+/* empty */
+};
+
+bool webp_convert(struct content *c);
+void webp_destroy(struct content *c);
+bool webp_redraw(struct content *c, int x, int y,
+		int width, int height,
+		int clip_x0, int clip_y0, int clip_x1, int clip_y1,
+		float scale, colour background_colour);
+bool webp_clone(const struct content *old, struct content *new_content);
+
+#endif /* WITH_WEBP */
+
+#endif