implemented GraphicsMagick compatibility

HISTORY

@@ -80,3 +80,7 @@ Version 1.1.0
   -l logo directory
 - changed detailed epg view using full screen, some further optimisations
 - search for <event_id>_0.jpg beside <event_id>.jpg as epg image
+- implemented GraphicsMagick compatibility (thanks @Manuel Reimer
+  for providing the patch)
+- changed Makefile to support both ImageMagick and GraphicsMagick
+  (configurable in Makefile)

Makefile

@@ -3,6 +3,9 @@
 #
 # $Id$
 
+# External image lib to use: imagemagick, graphicsmagick	
+IMAGELIB = imagemagick
+
 # The official name of this plugin.
 # This name will be used in the '-P...' option of VDR to load the plugin.
 # By default the main source file also carries this name.
@@ -44,13 +47,15 @@ SOFILE = libvdr-$(PLUGIN).so
 
 ### Includes and Defines (add further entries here):
 
-INCLUDES += $(shell pkg-config --cflags-only-I Magick++)
-
 DEFINES += -DPLUGIN_NAME_I18N='"$(PLUGIN)"'
-DEFINES += -DMAGICKCORE_HDRI_ENABLE=0
-DEFINES += -DMAGICKCORE_QUANTUM_DEPTH=16
 
-LIBS += $(shell pkg-config --libs Magick++)
+ifeq ($(IMAGELIB), imagemagick)
+	INCLUDES += $(shell pkg-config --cflags Magick++)
+	LIBS += $(shell pkg-config --libs Magick++)
+else ifeq ($(IMAGELIB), graphicsmagick)
+	INCLUDES += $(shell pkg-config --cflags GraphicsMagick++)
+	LIBS += $(shell pkg-config --libs GraphicsMagick++)
+endif
 
 ### The object files (add further files here):
 

imageloader.c

@@ -101,14 +101,7 @@ bool cImageLoader::LoadOsdElement(cString name, int width, int height) {
 bool cImageLoader::DrawBackground(tColor back, tColor blend, int width, int height) {
     if ((width < 1) || (height < 1) || (width > 1920) || (height > 1080))
         return false;
-    Color Back = Argb2Color(back);
-    Color Blend = Argb2Color(blend);
-    Image tmp(Geometry(width, height), Blend);
-    double arguments[9] = {0.0,(double)height,0.0,-1*(double)width,0.0,0.0,1.5*(double)width,0.0,1.0};
-    tmp.sparseColor(MatteChannel, BarycentricColorInterpolate, 9, arguments);
-    Image tmp2(Geometry(width, height), Back);
-    tmp.composite(tmp2, 0, 0, OverlayCompositeOp);
-    buffer = tmp;
+    CreateGradient(back, blend, width, height, 0.8, 0.8);
     return true;
 }
 
@@ -130,3 +123,28 @@ cImage cImageLoader::GetImage() {
     }
     return image;
 }
+
+void cImageLoader::CreateGradient(tColor back, tColor blend, int width, int height, double wfactor, double hfactor) {
+    Color Back = Argb2Color(back);
+    Color Blend = Argb2Color(blend);
+    int maxw = MaxRGB * wfactor;
+    int maxh = MaxRGB * hfactor;
+
+    Image imgblend(Geometry(width, height), Blend);
+    imgblend.modifyImage();
+    imgblend.type(TrueColorMatteType);
+    PixelPacket *pixels = imgblend.getPixels(0, 0, width, height);
+    for (int x = 0; x < width; x++) {
+        for (int y = 0; y < height; y++) {
+            PixelPacket *pixel = pixels + y * width + x;
+            int opacity = (maxw / width * x + maxh - maxh / height * y) / 2;
+            pixel->opacity = (opacity <= MaxRGB) ? opacity : MaxRGB;
+        }
+    }
+    imgblend.syncPixels();
+
+    Image imgback(Geometry(width, height), Back);
+    imgback.composite(imgblend, 0, 0, OverCompositeOp);
+
+    buffer = imgback;
+}

imageloader.h

@@ -22,6 +22,8 @@ public:
     bool LoadIcon(const char *cIcon, int size);
     bool LoadOsdElement(cString name, int width, int height);
     bool DrawBackground(tColor back, tColor blend, int width, int height);
+private:
+    void CreateGradient(tColor back, tColor blend, int width, int height, double wfactor, double hfactor);
 };
 
 #endif //_TVGUIDE_IMAGELOADER_H