wrlib: added support for imagemagick third-party lib

It uses to provide some missing common image format
like SVG, BMP, PICT, ...

wrlib/Makefile.am

@@ -64,6 +64,10 @@ if USE_WEBP
 libwraster_la_SOURCES += load_webp.c
 endif
 
+if USE_MAGICK
+libwraster_la_SOURCES += load_magick.c
+endif
+
 AM_CPPFLAGS = $(DFLAGS) @HEADER_SEARCH_PATH@
 
 libwraster_la_LIBADD = @LIBRARY_SEARCH_PATH@ @GFXLIBS@ @XLIBS@ @LIBXMU@ -lm

wrlib/imgformat.h

@@ -39,12 +39,13 @@ typedef enum {
 	IM_PPM     =  4,
 	IM_JPEG    =  5,
 	IM_GIF     =  6,
-	IM_WEBP    =  7
+	IM_WEBP    =  7,
+	IM_MAGICK  =  8
 } WRImgFormat;
 
 /* How many image types we have. */
 /* Increase this when adding new image types! */
-#define IM_TYPES    7
+#define IM_TYPES    8
 
 /*
  * Function for Loading in a specific format
@@ -73,6 +74,10 @@ RImage *RLoadGIF(const char *file, int index);
 RImage *RLoadWEBP(const char *file);
 #endif
 
+#ifdef USE_MAGICK
+RImage *RLoadMagick(const char *file_name);
+#endif
+
 /*
  * Function for Saving in a specific format
  */

wrlib/libwraster.map

@@ -72,6 +72,7 @@ LIBWRASTER3
     RRotateImage;
     RSaveImage;
     RScaleImage;
+    RShutdown;
     RSmoothScaleImage;
     RSupportedFileFormats;
 

wrlib/load.c

@@ -103,6 +103,13 @@ char **RSupportedFileFormats(void)
 	return tmp;
 }
 
+/* cleaning third-party libs at shutdown */
+void RShutdown() {
+#ifdef USE_MAGICK
+	MagickWandTerminus();
+#endif
+}
+
 static void init_cache(void)
 {
 	char *tmp;
@@ -165,8 +172,16 @@ RImage *RLoadImage(RContext * context, const char *file, int index)
 		return NULL;
 
 	case IM_UNKNOWN:
+#ifdef USE_MAGICK
+		/* generic file format support using ImageMagick
+		 * BMP, PCX, PICT, SVG, ...
+		 */
+		image = RLoadMagick(file);
+		break;
+#else
 		RErrorCode = RERR_BADFORMAT;
 		return NULL;
+#endif
 
 	case IM_XPM:
 		image = RLoadXPM(context, file);

wrlib/load_magick.c

@@ -0,0 +1,88 @@
+/* load_magick.c - load image file using ImageMagick
+ *
+ * Raster graphics library
+ *
+ * Copyright (c) 2014 Window Maker Team
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library 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
+ *  Library General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Library General Public
+ *  License along with this library; if not, write to the Free
+ *  Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
+ *  MA 02110-1301, USA.
+ */
+
+#include "config.h"
+#include <X11/Xlib.h>
+
+#include <wand/magick_wand.h>
+
+#include "wraster.h"
+#include "imgformat.h"
+
+
+RImage *RLoadMagick(const char *file_name)
+{
+	RImage *image = NULL;
+	unsigned char *ptr;
+	unsigned long w,h;
+	MagickWand *m_wand = NULL;
+	MagickBooleanType mrc;
+	MagickBooleanType hasAlfa;
+	PixelWand *bg_wand = NULL;
+
+	MagickWandGenesis();
+
+	/* Create a wand */
+	m_wand = NewMagickWand();
+
+	/* set the default background as transparent */
+	bg_wand = NewPixelWand();
+	PixelSetColor(bg_wand, "none");
+	MagickSetBackgroundColor(m_wand, bg_wand);
+
+	/* Read the input image */
+	if (!MagickReadImage(m_wand, file_name)) {
+		RErrorCode = RERR_BADIMAGEFILE;
+		goto bye;
+	}
+
+	w = MagickGetImageWidth(m_wand);
+	h = MagickGetImageHeight(m_wand);
+
+	hasAlfa = MagickGetImageAlphaChannel(m_wand);
+
+	image = RCreateImage(w, h, (unsigned int) hasAlfa);
+	if (!image) {
+		RErrorCode = RERR_NOMEMORY;
+		goto bye;
+	}
+
+	ptr = image->data;
+	if (hasAlfa == MagickTrue)
+		mrc = MagickExportImagePixels(m_wand, 0, 0, (size_t)w, (size_t)h, "RGBA", CharPixel, ptr);
+	else
+		mrc = MagickExportImagePixels(m_wand, 0, 0, (size_t)w, (size_t)h, "RGB", CharPixel, ptr);
+
+	if (mrc == MagickFalse) {
+		RErrorCode = RERR_BADIMAGEFILE;
+		RReleaseImage(image);
+		goto bye;
+	}
+
+bye:
+	/* Tidy up */
+	DestroyPixelWand(bg_wand);
+	MagickClearException(m_wand);
+	m_wand = DestroyMagickWand(m_wand);
+
+	return image;
+}

wrlib/wraster.h

@@ -431,7 +431,11 @@ RImage *RRenderMultiGradient(unsigned width, unsigned height, RColor **colors,
 RImage *RRenderInterwovenGradient(unsigned width, unsigned height,
                                   RColor colors1[2], int thickness1,
                                   RColor colors2[2], int thickness2);
+/*
+ * Cleaning
+ */
 
+void RShutdown();
 
 /*
  * Convertion into X Pixmaps