implemented GraphicsMagick compatibility

1 files changed, 26 insertions, 8 deletions

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;
+}
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