2 * Copyright (c) 2014 Samsung Electronics Co., Ltd.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
19 #include <dali-toolkit/public-api/shader-effects/nine-patch-mask-effect.h>
22 #include <dali/public-api/animation/constraint.h>
23 #include <dali/public-api/object/property-input.h>
24 #include <dali/public-api/shader-effects/shader-effect.h>
25 #include <dali/public-api/images/resource-image.h>
33 namespace NinePatchMaskEffect
39 void NinePatchMaskEffectSizeConstraint( Vector2& current, const PropertyInputContainer& inputs )
41 const Vector3& actorSize = inputs[0]->GetVector3();
42 current.x = actorSize.x;
43 current.y = actorSize.y;
46 } // unnamed namespace
48 static void DoApply( ImageActor actor, const std::string& maskImage, const Vector2& maskSize, Vector4 maskBorder )
50 const char* ALPHA_MASK_VERTEX_SHADER_SOURCE =
51 "precision mediump float;\n"
52 "uniform vec2 uImageSize; \n"
53 "uniform vec2 uMaskSize; \n"
54 "varying vec2 vMaskTexCoord; \n"
58 " gl_Position = uMvpMatrix * vec4(aPosition, 1.0); \n"
60 " // Ignore mask UVs for image \n"
62 " highp vec2 halfImageSize = uImageSize * 0.5; \n"
63 " vTexCoord = (aPosition.xy + halfImageSize) / uImageSize; \n"
65 " // UVs were calculated for image size, so convert for mask size \n"
67 " highp vec2 halfMaskSize = uMaskSize * 0.5; \n"
68 " highp vec2 halfSizeDelta = halfImageSize - halfMaskSize; \n"
70 " highp vec2 maskPosition = aPosition.xy; \n"
71 " maskPosition.x -= halfSizeDelta.x * sign(aPosition.x); \n"
72 " maskPosition.y -= halfSizeDelta.y * sign(aPosition.y); \n"
74 " vMaskTexCoord = (maskPosition + halfMaskSize) / uMaskSize; \n"
77 const char* ALPHA_MASK_FRAGMENT_SHADER_SOURCE =
78 "varying mediump vec2 vMaskTexCoord; \n"
82 " highp vec4 mask = texture2D(sEffect, vMaskTexCoord); \n"
83 " gl_FragColor = texture2D(sTexture, vTexCoord) * uColor * vec4(1,1,1,mask.a); \n"
86 ShaderEffect maskEffect = ShaderEffect::New(
87 ALPHA_MASK_VERTEX_SHADER_SOURCE,
88 ALPHA_MASK_FRAGMENT_SHADER_SOURCE,
89 GeometryType( GEOMETRY_TYPE_IMAGE ),
90 ShaderEffect::GeometryHints( ShaderEffect::HINT_BLENDING ) );
92 maskEffect.SetEffectImage( ResourceImage::New( maskImage ) );
94 maskEffect.SetUniform( "uImageSize", Vector2(0,0) /*Constrained to actor size*/ );
96 Constraint constraint = Constraint::New<Vector2>( maskEffect, maskEffect.GetPropertyIndex("uImageSize"), NinePatchMaskEffectSizeConstraint );
97 constraint.AddSource( Source(actor, Actor::Property::SIZE) );
100 maskEffect.SetUniform( "uMaskSize", maskSize );
102 // Actor must provide nine-patch style geometry for this effect to work
103 actor.SetStyle( ImageActor::STYLE_NINE_PATCH );
104 actor.SetNinePatchBorder( maskBorder );
106 actor.SetShaderEffect( maskEffect );
109 void Apply( ImageActor actor, const std::string& maskImage )
111 const Uint16Pair maskSize = ResourceImage::GetImageSize( maskImage );
113 const float leftRight = (maskSize.GetWidth() - 1.0f) * 0.5f;
114 const float topBottom = (maskSize.GetHeight() - 1.0f) * 0.5f;
116 DoApply( actor, maskImage, Vector2( maskSize.GetWidth(), maskSize.GetHeight() ), Vector4( leftRight, topBottom, leftRight, topBottom ) );
119 void Apply( ImageActor actor, const std::string& maskImage, const Vector4& maskBorder )
121 const Uint16Pair maskSize = ResourceImage::GetImageSize( maskImage );
123 DoApply( actor, maskImage, Vector2( maskSize.GetWidth(), maskSize.GetHeight() ), maskBorder );
126 } // namespace NinePatchMaskEffect
128 } // namespace Toolkit