diff options
| -rw-r--r-- | bundles/org.eclipse.swt/Eclipse SWT/common/org/eclipse/swt/graphics/ImageData.java | 26 |
1 files changed, 22 insertions, 4 deletions
diff --git a/bundles/org.eclipse.swt/Eclipse SWT/common/org/eclipse/swt/graphics/ImageData.java b/bundles/org.eclipse.swt/Eclipse SWT/common/org/eclipse/swt/graphics/ImageData.java index a6781948de..d13ecb1105 100644 --- a/bundles/org.eclipse.swt/Eclipse SWT/common/org/eclipse/swt/graphics/ImageData.java +++ b/bundles/org.eclipse.swt/Eclipse SWT/common/org/eclipse/swt/graphics/ImageData.java @@ -1073,13 +1073,31 @@ public RGB[] getRGBs() { * @return the transparency mask */ public ImageData getTransparencyMask() { - if (getTransparencyType() == SWT.TRANSPARENCY_MASK) { - return new ImageData(width, height, 1, bwPalette(), maskPad, maskData); - } else { - return colorMaskImage(transparentPixel); + int transparencyType = getTransparencyType(); + switch (transparencyType) { + case SWT.TRANSPARENCY_ALPHA: return getTransparencyMaskFromAlphaData(); + case SWT.TRANSPARENCY_MASK: return new ImageData(width, height, 1, bwPalette(), maskPad, maskData); + case SWT.TRANSPARENCY_PIXEL: return colorMaskImage(transparentPixel); + default: return colorMaskImage(transparentPixel); } } +ImageData getTransparencyMaskFromAlphaData() { + ImageData mask = new ImageData(width, height, 1, bwPalette(), 2, null, 0, null, null, -1, -1, SWT.IMAGE_UNDEFINED, 0, 0, 0, 0); + int offset = 0; + for (int y = 0; y < height; y++) { + for (int x = 0; x < width; x++) { + byte a = alphaData[offset++]; + if (a == 0) { + mask.setPixel(x, y, 0); + } else { + mask.setPixel(x, y, 1); + } + } + } + return mask; +} + /** * Returns the image transparency type, which will be one of * <code>SWT.TRANSPARENCY_NONE</code>, <code>SWT.TRANSPARENCY_MASK</code>, |