dplug.flatwidgets.flatbackgroundgui source code

1 /**
2  * The root widget to inherit from for a flat UI.
3  *
4  * Copyright: Copyright Auburn Sounds 2015-2017.
5  * Copyright: Cut Through Recordings 2017.
6  * License:   $(LINK2 http://www.boost.org/LICENSE_1_0.txt, Boost License 1.0)
7  * Authors:   Ethan Reker
8  */
9 module dplug.flatwidgets.flatbackgroundgui;
10 
11 import gfm.math.box;
12 import dplug.core.nogc;
13 import dplug.core.file;
14 import dplug.graphics.color;
15 import dplug.graphics.image;
16 import dplug.graphics.view;
17 import dplug.graphics.drawex;
18 
19 import dplug.core.nogc;
20 import dplug.gui.graphics;
21 
22 /// FlatBackgroundGUI provides a background that is loaded from a PNG or JPEG
23 /// image. The string for backgroundPath should be in "stringImportPaths"
24 /// specified in dub.json
25 class FlatBackgroundGUI(string backgroundPath) : GUIGraphics
26 {
27 public:
28 nothrow:
29 @nogc:
30 
31     this(int width, int height)
32     {
33         super(width, height);
34         _backgroundImage = loadOwnedImage(cast(ubyte[])(import(backgroundPath)));
35     }
36     
37     ~this()
38     {
39         if(_backgroundImage)
40             _backgroundImage.destroyFree();
41     }
42     
43     override void reflow(box2i availableSpace)
44     {
45         _position = availableSpace;
46     }
47     
48     /// Fill diffuse map with diffuse from background image.  Alpha is ignored since ideally a background image will not
49     /// need an alpha channel.
50     /// Material and depth maps are zeroed out to initialize them. Otherwise this can lead to nasty errors.
51     override void onDraw(ImageRef!RGBA diffuseMap, ImageRef!L16 depthMap, ImageRef!RGBA materialMap, box2i[] dirtyRects) nothrow @nogc
52     {
53         foreach(dirtyRect; dirtyRects)
54         {
55             auto croppedDiffuseIn = _backgroundImage.crop(dirtyRect);
56             auto croppedDiffuseOut = diffuseMap.crop(dirtyRect);
57             auto croppedMaterialOut = materialMap.crop(dirtyRect);
58             auto croppedDepthOut = depthMap.crop(dirtyRect);
59 
60             immutable RGBA inputMaterial = RGBA(0, 0, 0, 0);
61             immutable L16 inputDepth = L16(0);
62 
63             for(int j = 0; j < dirtyRect.height; ++j){
64                 RGBA[] inputDiffuse = croppedDiffuseIn.scanline(j);
65                 RGBA[] outputDiffuse = croppedDiffuseOut.scanline(j);
66                 RGBA[] outputMaterial = croppedMaterialOut.scanline(j);
67                 L16[] outputDepth = croppedDepthOut.scanline(j);
68 
69                 for(int i = 0; i < dirtyRect.width; ++i){
70                     outputDiffuse[i] = inputDiffuse[i];
71                     outputMaterial[i] = inputMaterial;
72                     outputDepth[i] = inputDepth;
73                 }
74             }
75         }
76     }
77     
78 private:
79     OwnedImage!RGBA _backgroundImage;
80 }