From 3952cad3d41c236640ef159825be81eba6c3116d Mon Sep 17 00:00:00 2001
From: Manuel Reimer <manuel.reimer@gmx.de>
Date: Sun, 22 Dec 2013 10:39:46 +0100
Subject: [PATCH] implemented GraphicsMagick compatibility

---
 HISTORY       |  4 ++++
 Makefile      | 15 ++++++++++-----
 imageloader.c | 34 ++++++++++++++++++++++++++--------
 imageloader.h |  2 ++
 4 files changed, 42 insertions(+), 13 deletions(-)

diff --git a/HISTORY b/HISTORY
index 3933e3a..77b9352 100644
--- a/HISTORY
+++ b/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)
diff --git a/Makefile b/Makefile
index 176ad7d..01d28ac 100644
--- a/Makefile
+++ b/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):
 
diff --git a/imageloader.c b/imageloader.c
index 2faeb91..d194295 100644
--- a/imageloader.c
+++ b/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;
+}
\ No newline at end of file
diff --git a/imageloader.h b/imageloader.h
index f06b542..942986f 100644
--- a/imageloader.h
+++ b/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