From: Eunki, Hong <eunkiki.hong@samsung.com>
Date: Wed, 1 Dec 2021 12:02:20 +0000 (+0900)
Subject: Scaledown image when visual is bigger than n-patch fixed length
X-Git-Tag: dali_2.1.2~3
X-Git-Url: http://review.tizen.org/git/?p=platform%2Fcore%2Fuifw%2Fdali-toolkit.git;a=commitdiff_plain;h=026d5e1e9c5a1bbffa8240890e4b3374692196a9

Scaledown image when visual is bigger than n-patch fixed length

When n-patch image's fixed length is bigger than visual size,
the visual's geometry breakdown.

This patch calculate good scales in vertex shader.

NOTE : We scaledown same rates both width and height. This action follow up CSS current action.

Change-Id: Ief2c6e6e2deb04dac36a1b9575e7bd620697d81d
Signed-off-by: Eunki, Hong <eunkiki.hong@samsung.com>
---

diff --git a/dali-toolkit/internal/graphics/shaders/npatch-visual-3x3-shader.vert b/dali-toolkit/internal/graphics/shaders/npatch-visual-3x3-shader.vert
index 1586312..c7b8a9f 100644
--- a/dali-toolkit/internal/graphics/shaders/npatch-visual-3x3-shader.vert
+++ b/dali-toolkit/internal/graphics/shaders/npatch-visual-3x3-shader.vert
@@ -25,7 +25,10 @@ void main()
   mediump vec2 stretch  = floor( aPosition * 0.5 );
   mediump vec2 fixedTotal   = uFixed[ 2 ];
 
-  mediump vec4 gridPosition = vec4( fixedFactor + ( size - fixedTotal ) * stretch, 0.0, 1.0 );
+  // Scale down if fixedTotal is bigger than visualSize
+  mediump float fixedScaleDownRate = min(1.0, min(size.x / fixedTotal.x, size.y / fixedTotal.y));
+
+  mediump vec4 gridPosition = vec4( fixedFactor * fixedScaleDownRate + ( size - fixedTotal * fixedScaleDownRate ) * stretch, 0.0, 1.0 );
   mediump vec4 vertexPosition = gridPosition;
   vertexPosition.xy -= size * vec2( 0.5, 0.5 );
   vertexPosition.xy += anchorPoint*size + (visualOffset + origin)*uSize.xy;
diff --git a/dali-toolkit/internal/graphics/shaders/npatch-visual-shader.vert b/dali-toolkit/internal/graphics/shaders/npatch-visual-shader.vert
index 07f645b..4cd84bc 100644
--- a/dali-toolkit/internal/graphics/shaders/npatch-visual-shader.vert
+++ b/dali-toolkit/internal/graphics/shaders/npatch-visual-shader.vert
@@ -25,7 +25,10 @@ void main()
   vec2 visualSize = mix(uSize.xy*size, size, offsetSizeMode.zw ) + extraSize;
   vec2 visualOffset = mix( offset, offset/uSize.xy, offsetSizeMode.xy);
 
-  mediump vec4 gridPosition = vec4( fixedFactor + ( visualSize.xy - fixedTotal ) * stretch / stretchTotal, 0.0, 1.0 );
+  // Scale down if fixedTotal is bigger than visualSize
+  mediump float fixedScaleDownRate = min(1.0, min(visualSize.x / fixedTotal.x, visualSize.y / fixedTotal.y));
+
+  mediump vec4 gridPosition = vec4( fixedFactor * fixedScaleDownRate + ( visualSize.xy - fixedTotal * fixedScaleDownRate ) * stretch / stretchTotal, 0.0, 1.0 );
   mediump vec4 vertexPosition = gridPosition;
   vertexPosition.xy -= visualSize.xy * vec2( 0.5, 0.5 );
   vertexPosition.xy += anchorPoint*visualSize + (visualOffset + origin)*uSize.xy;