[Mono-bugs] [Bug 346082] GradientBrush mis-render for SpreadMethod= Repeat|Reflect in Absolute MappingMode and small values

[bugzilla_noreply at novell.com]

https://bugzilla.novell.com/show_bug.cgi?id=346082

User spouliot at novell.com added comment
https://bugzilla.novell.com/show_bug.cgi?id=346082#c1





--- Comment #1 from Sebastien Pouliot <spouliot at novell.com>  2007-12-04 18:58:46 MST ---
<Canvas xmlns="http://schemas.microsoft.com/client/2007">
        <!-- OK - nothing is drawn -->
        <Rectangle Canvas.Left="60" Width="50" Height="50">
        <Rectangle.Fill>
                <LinearGradientBrush SpreadMethod="Pad" StartPoint="0,0"
EndPoint="1,1" MappingMode="RelativeToBoundingBox">
                        <GradientStop Color="Red" Offset="0.0" />
                        <GradientStop Color="Green" Offset="0.5" />
                        <GradientStop Color="Blue" Offset="1.0" />
                </LinearGradientBrush>
        </Rectangle.Fill>
        </Rectangle>

        <!-- OK - red green blue in a diagonal from left top to bottom right
-->
        <Rectangle Canvas.Left="60" Width="50" Height="50">
        <Rectangle.Fill>
                <LinearGradientBrush SpreadMethod="Pad" StartPoint="0,0"
EndPoint="1,1">
                        <GradientStop Color="Red" Offset="0.0" />
                        <GradientStop Color="Green" Offset="0.5" />
                        <GradientStop Color="Blue" Offset="1.0" />
                </LinearGradientBrush>
        </Rectangle.Fill>
        </Rectangle>

        <!-- OK - all blue -->
        <Rectangle Canvas.Left="120" Width="50" Height="50">
        <Rectangle.Fill>
                <LinearGradientBrush SpreadMethod="Pad" StartPoint="0,0"
EndPoint="0,0" MappingMode="RelativeToBoundingBox">
                        <GradientStop Color="Red" Offset="0.0" />
                        <GradientStop Color="Green" Offset="0.5" />
                        <GradientStop Color="Blue" Offset="1.0" />
                </LinearGradientBrush>
        </Rectangle.Fill>
        </Rectangle>
Reflect for
        <!-- OK - all blue -->
        <Rectangle Canvas.Left="180" Width="50" Height="50">
        <Rectangle.Fill>
                <LinearGradientBrush SpreadMethod="Pad" StartPoint="0,0"
EndPoint="0,0">
                        <GradientStop Color="Red" Offset="0.0" />
                        <GradientStop Color="Green" Offset="0.5" />
                        <GradientStop Color="Blue" Offset="1.0" />
                </LinearGradientBrush>
        </Rectangle.Fill>
        </Rectangle>


        <!-- OK - all blue -->
        <Rectangle Canvas.Top="60" Width="50" Height="50">
        <Rectangle.Fill>
                <LinearGradientBrush SpreadMethod="Pad" StartPoint="0,0"
EndPoint="1,1" MappingMode="Absolute">
                        <GradientStop Color="Red" Offset="0.0" />
                        <GradientStop Color="Green" Offset="0.5" />
                        <GradientStop Color="Blue" Offset="1.0" />
                </LinearGradientBrush>
        </Rectangle.Fill>
        </Rectangle>

        <!-- OK - all blue -->
        <Rectangle Canvas.Top="60" Canvas.Left="60" Width="50" Height="50">
        <Rectangle.Fill>
                <LinearGradientBrush SpreadMethod="Pad" StartPoint="0,0"
EndPoint="0.5,0.5" MappingMode="Absolute">
                        <GradientStop Color="Red" Offset="0.0" />
                        <GradientStop Color="Green" Offset="0.5" />
                        <GradientStop Color="Blue" Offset="1.0" />
                </LinearGradientBrush>
        </Rectangle.Fill>
        </Rectangle>

        <!-- OK - all blue -->
        <Rectangle Canvas.Top="60" Canvas.Left="120" Width="50" Height="50">
        <Rectangle.Fill>
                <LinearGradientBrush SpreadMethod="Pad" StartPoint="0,0"
EndPoint="0.5,0.5" MappingMode="Absolute">
                        <GradientStop Color="Red" Offset="0.0" />
                        <GradientStop Color="Green" Offset="0.5" />
                        <GradientStop Color="Blue" Offset="1.0" />
                </LinearGradientBrush>
        </Rectangle.Fill>
        </Rectangle>

        <!-- OK - all blue -->
        <Rectangle Canvas.Top="60" Canvas.Left="180" Width="50" Height="50"
Fill="Blue" />

        <!-- BAD - should be grey but Moonlight shows blue -->
        <Rectangle Canvas.Top="120" Width="50" Height="50">
        <Rectangle.Fill>
                <LinearGradientBrush SpreadMethod="Reflect" StartPoint="0,0"
EndPoint="0,0" MappingMode="Absolute">
                        <GradientStop Color="Red" Offset="0.0" />
                        <GradientStop Color="Green" Offset="0.5" />
                        <GradientStop Color="Blue" Offset="1.0" />
                </LinearGradientBrush>
        </Rectangle.Fill>
        </Rectangle>

        <!-- BAD - should be grey but Moonlight shows a purple-like pattern -->
        <Rectangle Canvas.Top="120" Canvas.Left="60" Width="50" Height="50">
        <Rectangle.Fill>
                <LinearGradientBrush SpreadMethod="Reflect" StartPoint="0,0"
EndPoint="0.5,0.5" MappingMode="Absolute">
                        <GradientStop Color="Red" Offset="0.0" />
                        <GradientStop Color="Green" Offset="0.5" />
                        <GradientStop Color="Blue" Offset="1.0" />
                </LinearGradientBrush>
        </Rectangle.Fill>
        </Rectangle>

        <!-- BAD - should be grey but Moonlight shows a tight rgb pattern -->
        <Rectangle Canvas.Top="120" Canvas.Left="120" Width="50" Height="50">
        <Rectangle.Fill>
                <LinearGradientBrush SpreadMethod="Reflect" StartPoint="0,0"
EndPoint="1.0,1.0" MappingMode="Absolute">
                        <GradientStop Color="Red" Offset="0.0" />
                        <GradientStop Color="Green" Offset="0.5" />
                        <GradientStop Color="Blue" Offset="1.0" />
                </LinearGradientBrush>
        </Rectangle.Fill>
        </Rectangle>

        <!-- OK - a red green blue pattern in a diagonal from left top to
bottom right -->
        <Rectangle Canvas.Top="120" Canvas.Left="180" Width="50" Height="50">
        <Rectangle.Fill>
                <LinearGradientBrush SpreadMethod="Reflect" StartPoint="0,0"
EndPoint="2.0,2.0" MappingMode="Absolute">
                        <GradientStop Color="Red" Offset="0.0" />
                        <GradientStop Color="Green" Offset="0.5" />
                        <GradientStop Color="Blue" Offset="1.0" />
                </LinearGradientBrush>
        </Rectangle.Fill>
        </Rectangle>


        <!-- BAD - should be grey but Moonlight shows blue -->
        <Rectangle Canvas.Top="180" Width="50" Height="50">
        <Rectangle.Fill>
                <LinearGradientBrush SpreadMethod="Repeat" StartPoint="0,0"
EndPoint="0,0" MappingMode="Absolute">
                        <GradientStop Color="Red" Offset="0.0" />
                        <GradientStop Color="Green" Offset="0.5" />
                        <GradientStop Color="Blue" Offset="1.0" />
                </LinearGradientBrush>
        </Rectangle.Fill>
        </Rectangle>

        <!-- BAD - should be grey but Moonlight shows blue -->
        <Rectangle Canvas.Top="180" Canvas.Left="60" Width="50" Height="50">
        <Rectangle.Fill>
                <LinearGradientBrush SpreadMethod="Repeat" StartPoint="0,0"
EndPoint="0.5,0.5" MappingMode="Absolute">
                        <GradientStop Color="Red" Offset="0.0" />
                        <GradientStop Color="Green" Offset="0.5" />
                        <GradientStop Color="Blue" Offset="1.0" />
                </LinearGradientBrush>
        </Rectangle.Fill>
        </Rectangle>

        <!-- BAD - should be grey but Moonlight shows a blueisgh pattern -->
        <Rectangle Canvas.Top="180" Canvas.Left="120" Width="50" Height="50">
        <Rectangle.Fill>
                <LinearGradientBrush SpreadMethod="Repeat" StartPoint="0,0"
EndPoint="1.0,1.0" MappingMode="Absolute">
                        <GradientStop Color="Red" Offset="0.0" />
                        <GradientStop Color="Green" Offset="0.5" />
                        <GradientStop Color="Blue" Offset="1.0" />
                </LinearGradientBrush>
        </Rectangle.Fill>
        </Rectangle>

        <!-- BAD - similar but Moonlight has too much blue in the pattern -->
        <Rectangle Canvas.Top="180" Canvas.Left="180" Width="50" Height="50">
        <Rectangle.Fill>
                <LinearGradientBrush SpreadMethod="Repeat" StartPoint="0,0"
EndPoint="2.0,2.0" MappingMode="Absolute">
                        <GradientStop Color="Red" Offset="0.0" />
                        <GradientStop Color="Green" Offset="0.5" />
                        <GradientStop Color="Blue" Offset="1.0" />
                </LinearGradientBrush>
        </Rectangle.Fill>
        </Rectangle>
</Canvas>


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