Cairo context: introduce #maskContext: which paints at 0@0

pharo-graphics · Nov 29, 2024 · ef5e1b1 · ef5e1b1
1 parent 27e60e6
commit ef5e1b1
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Showing 3 changed files with 12 additions and 4 deletions.
diff --git a/src/Alexandrie-Cairo-Tests/AeCairoExamplesRenderTest.class.st b/src/Alexandrie-Cairo-Tests/AeCairoExamplesRenderTest.class.st
@@ -129,7 +129,7 @@ AeCairoExamplesRenderTest >> surfaceWithColoredIcons [
 	    do: [ :eachColor |
 	        outputContext
 	            sourceColor: eachColor;
-	            maskSurface: inputSurface x: 0 y: 0 ]
+	            maskSurface: inputSurface ]
 	    separatedBy: [
 	        outputContext
 	            translateByX: inputSurface width

diff --git a/src/Alexandrie-Cairo/AeCairoContext.class.st b/src/Alexandrie-Cairo/AeCairoContext.class.st
@@ -1059,9 +1059,17 @@ AeCairoContext >> maskGroupWith: aBlockClosure [
 ]
 
 { #category : #'API - painting' }
-AeCairoContext >> maskSurface: anAeCairoImageSurface at: aPoint [
+AeCairoContext >> maskSurface: aSurface [
+	"Paint the current source using the alpha channel of surface as a mask, at 0@0."
 
-	self maskSurface: anAeCairoImageSurface x: aPoint x y: aPoint y
+	self maskSurface: aSurface x: 0.0 x y: 0.0
+]
+
+{ #category : #'API - painting' }
+AeCairoContext >> maskSurface: aSurface at: aPoint [
+	"Paint the current source using the alpha channel of surface as a mask, at the specified Point."
+
+	self maskSurface: aSurface x: aPoint x y: aPoint y
 ]
 
 { #category : #'API - painting' }

diff --git a/src/Alexandrie-Cairo/AeCairoImageSurface.class.st b/src/Alexandrie-Cairo/AeCairoImageSurface.class.st
@@ -216,7 +216,7 @@ AeCairoImageSurface >> asAlphaChannelGrayscaleImage [
 		sourceColorR: 1.0 g: 1.0 b: 1.0;
 		paint;
 		sourceColorR: 0.0 g: 0.0 b: 0.0;
-	 	maskSurface: self x: 0.0 y: 0.0.
+	 	maskSurface: self.
 
 	^ aSurface