Examples with ImageDataProvider org.eclipse.swt.graphics.ImageDataProvider used on opensource projects

Example 1 with ImageDataProvider

use of org.eclipse.swt.graphics.ImageDataProvider in project eclipse.platform.swt by eclipse.

the class Test_org_eclipse_swt_graphics_Image method test_ConstructorLorg_eclipse_swt_graphics_Device_ImageDataProvider.

@Test
public void test_ConstructorLorg_eclipse_swt_graphics_Device_ImageDataProvider() {
    // Null provider
    ImageDataProvider provider = null;
    try {
        Image image = new Image(display, provider);
        image.dispose();
        fail("No exception thrown for file name == null");
    } catch (IllegalArgumentException e) {
        assertSWTProblem("Incorrect exception thrown for provider == null", SWT.ERROR_NULL_ARGUMENT, e);
    }
    // Invalid provider
    provider = zoom -> null;
    try {
        Image image = new Image(display, provider);
        image.dispose();
        fail("No exception thrown for non-existent file name");
    } catch (IllegalArgumentException e) {
        assertSWTProblem("Incorrect exception thrown for provider == null", SWT.ERROR_INVALID_ARGUMENT, e);
    }
    // Valid provider
    Image image = new Image(display, imageDataProvider);
    image.dispose();
    // Corrupt Image provider
    provider = zoom -> {
        String fileName;
        switch(zoom) {
            case 100:
                fileName = "corrupt.png";
                break;
            case 150:
                fileName = "corrupt.png";
                break;
            case 200:
                fileName = "corrupt.png";
                break;
            default:
                return null;
        }
        return new ImageData(getPath(fileName));
    };
    try {
        image = new Image(display, provider);
        image.dispose();
        fail("No exception thrown for corrupt image file.");
    } catch (SWTException e) {
        assertSWTProblem("Incorrect exception thrown for provider with corrupt images", SWT.ERROR_INVALID_IMAGE, e);
    }
    // Valid provider only 100% zoom
    provider = zoom -> {
        String fileName;
        switch(zoom) {
            case 100:
                fileName = "collapseall.png";
                break;
            case 150:
            case 200:
            default:
                return null;
        }
        return new ImageData(getPath(fileName));
    };
    image = new Image(display, provider);
    image.dispose();
}

Example 2 with ImageDataProvider

use of org.eclipse.swt.graphics.ImageDataProvider in project eclipse.platform.text by eclipse.

the class LineNumberRulerColumn method doubleBufferPaint.

/**
 * Double buffer drawing.
 *
 * @param dest the GC to draw into
 */
private void doubleBufferPaint(GC dest) {
    Point size = fCanvas.getSize();
    if (size.x <= 0 || size.y <= 0)
        return;
    if (fBuffer != null) {
        Rectangle r = fBuffer.getBounds();
        if (r.width != size.x || r.height != size.y) {
            fBuffer.dispose();
            fBuffer = null;
        }
    }
    ILineRange visibleLines = JFaceTextUtil.getVisibleModelLines(fCachedTextViewer);
    if (visibleLines == null)
        return;
    if (IS_MAC_BUG_516293) {
        /* FIXME: Workaround (bug 516293):
			 * Relies on SWT implementation detail that GC drawing on macOS only draws at 100% zoom level.
			 * For higher zoom levels (200%), we manually scale the font and drawing coordinates,
			 * and then use getImageData(100) to extract the high-resolution image data. */
        fBuffer = new Image(fCanvas.getDisplay(), (ImageDataProvider) zoom -> {
            fZoom = zoom;
            internalSetZoom(zoom);
            int width = size.x * zoom / 100;
            int height = size.y * zoom / 100;
            Image gcImage = new Image(fCanvas.getDisplay(), width, height);
            GC gc = new GC(gcImage);
            Font font = fCanvas.getFont();
            if (zoom != 100) {
                if (fLastFont != null && font == fLastFont.get()) {
                    font = fLastZoomedFont;
                } else {
                    fLastFont = new WeakReference<>(font);
                    FontData fontData = font.getFontData()[0];
                    fontData.setHeight(fontData.getHeight() * zoom / 100);
                    font = new Font(font.getDevice(), fontData);
                    fLastZoomedFont = font;
                }
            }
            gc.setFont(font);
            if (fForeground != null)
                gc.setForeground(fForeground);
            try {
                gc.setBackground(getBackground(fCanvas.getDisplay()));
                gc.fillRectangle(0, 0, width, height);
                doPaint(gc, visibleLines);
            } finally {
                gc.dispose();
                fZoom = 100;
            }
            ImageData imageData = gcImage.getImageData(100);
            gcImage.dispose();
            return imageData;
        });
    } else {
        if (fBuffer == null)
            fBuffer = new Image(fCanvas.getDisplay(), size.x, size.y);
        GC gc = new GC(fBuffer);
        gc.setFont(fCanvas.getFont());
        if (fForeground != null)
            gc.setForeground(fForeground);
        try {
            gc.setBackground(getBackground(fCanvas.getDisplay()));
            gc.fillRectangle(0, 0, size.x, size.y);
            doPaint(gc, visibleLines);
        } finally {
            gc.dispose();
        }
    }
    dest.drawImage(fBuffer, 0, 0);
}