Extract PreviewPositionHelper to shared library (b2551fc7) · Commits · e / os / android_frameworks_base

packages/SystemUI/shared/src/com/android/systemui/shared/recents/utilities/PreviewPositionHelper.java

0 → 100644

+209 −0

Original line number	Diff line number	Diff line
		package com.android.systemui.shared.recents.utilities;

		import static android.app.WindowConfiguration.WINDOWING_MODE_FULLSCREEN;

		import android.graphics.Matrix;
		import android.graphics.Rect;
		import android.graphics.RectF;
		import android.view.Surface;

		import com.android.systemui.shared.recents.model.ThumbnailData;

		/**
		* Utility class to position the thumbnail in the TaskView
		*/
		public class PreviewPositionHelper {

		public static final float MAX_PCT_BEFORE_ASPECT_RATIOS_CONSIDERED_DIFFERENT = 0.1f;

		// Contains the portion of the thumbnail that is unclipped when fullscreen progress = 1.
		private final RectF mClippedInsets = new RectF();
		private final Matrix mMatrix = new Matrix();
		private boolean mIsOrientationChanged;

		public Matrix getMatrix() {
		return mMatrix;
		}

		public void setOrientationChanged(boolean orientationChanged) {
		mIsOrientationChanged = orientationChanged;
		}

		public boolean isOrientationChanged() {
		return mIsOrientationChanged;
		}

		/**
		* Updates the matrix based on the provided parameters
		*/
		public void updateThumbnailMatrix(Rect thumbnailBounds, ThumbnailData thumbnailData,
		int canvasWidth, int canvasHeight, int screenWidthPx, int taskbarSize, boolean isTablet,
		int currentRotation, boolean isRtl) {
		boolean isRotated = false;
		boolean isOrientationDifferent;

		int thumbnailRotation = thumbnailData.rotation;
		int deltaRotate = getRotationDelta(currentRotation, thumbnailRotation);
		RectF thumbnailClipHint = new RectF();
		float canvasScreenRatio = canvasWidth / (float) screenWidthPx;
		float scaledTaskbarSize = taskbarSize * canvasScreenRatio;
		thumbnailClipHint.bottom = isTablet ? scaledTaskbarSize : 0;

		float scale = thumbnailData.scale;
		final float thumbnailScale;

		// Landscape vs portrait change.
		// Note: Disable rotation in grid layout.
		boolean windowingModeSupportsRotation =
		thumbnailData.windowingMode == WINDOWING_MODE_FULLSCREEN && !isTablet;
		isOrientationDifferent = isOrientationChange(deltaRotate)
		&& windowingModeSupportsRotation;
		if (canvasWidth == 0 \|\| canvasHeight == 0 \|\| scale == 0) {
		// If we haven't measured , skip the thumbnail drawing and only draw the background
		// color
		thumbnailScale = 0f;
		} else {
		// Rotate the screenshot if not in multi-window mode
		isRotated = deltaRotate > 0 && windowingModeSupportsRotation;

		float surfaceWidth = thumbnailBounds.width() / scale;
		float surfaceHeight = thumbnailBounds.height() / scale;
		float availableWidth = surfaceWidth
		- (thumbnailClipHint.left + thumbnailClipHint.right);
		float availableHeight = surfaceHeight
		- (thumbnailClipHint.top + thumbnailClipHint.bottom);

		float canvasAspect = canvasWidth / (float) canvasHeight;
		float availableAspect = isRotated
		? availableHeight / availableWidth
		: availableWidth / availableHeight;
		boolean isAspectLargelyDifferent =
		Utilities.isRelativePercentDifferenceGreaterThan(canvasAspect,
		availableAspect, MAX_PCT_BEFORE_ASPECT_RATIOS_CONSIDERED_DIFFERENT);
		if (isRotated && isAspectLargelyDifferent) {
		// Do not rotate thumbnail if it would not improve fit
		isRotated = false;
		isOrientationDifferent = false;
		}

		if (isAspectLargelyDifferent) {
		// Crop letterbox insets if insets isn't already clipped
		thumbnailClipHint.left = thumbnailData.letterboxInsets.left;
		thumbnailClipHint.right = thumbnailData.letterboxInsets.right;
		thumbnailClipHint.top = thumbnailData.letterboxInsets.top;
		thumbnailClipHint.bottom = thumbnailData.letterboxInsets.bottom;
		availableWidth = surfaceWidth
		- (thumbnailClipHint.left + thumbnailClipHint.right);
		availableHeight = surfaceHeight
		- (thumbnailClipHint.top + thumbnailClipHint.bottom);
		}

		final float targetW, targetH;
		if (isOrientationDifferent) {
		targetW = canvasHeight;
		targetH = canvasWidth;
		} else {
		targetW = canvasWidth;
		targetH = canvasHeight;
		}
		float targetAspect = targetW / targetH;

		// Update the clipHint such that
		// > the final clipped position has same aspect ratio as requested by canvas
		// > first fit the width and crop the extra height
		// > if that will leave empty space, fit the height and crop the width instead
		float croppedWidth = availableWidth;
		float croppedHeight = croppedWidth / targetAspect;
		if (croppedHeight > availableHeight) {
		croppedHeight = availableHeight;
		if (croppedHeight < targetH) {
		croppedHeight = Math.min(targetH, surfaceHeight);
		}
		croppedWidth = croppedHeight * targetAspect;

		// One last check in case the task aspect radio messed up something
		if (croppedWidth > surfaceWidth) {
		croppedWidth = surfaceWidth;
		croppedHeight = croppedWidth / targetAspect;
		}
		}

		// Update the clip hints. Align to 0,0, crop the remaining.
		if (isRtl) {
		thumbnailClipHint.left += availableWidth - croppedWidth;
		if (thumbnailClipHint.right < 0) {
		thumbnailClipHint.left += thumbnailClipHint.right;
		thumbnailClipHint.right = 0;
		}
		} else {
		thumbnailClipHint.right += availableWidth - croppedWidth;
		if (thumbnailClipHint.left < 0) {
		thumbnailClipHint.right += thumbnailClipHint.left;
		thumbnailClipHint.left = 0;
		}
		}
		thumbnailClipHint.bottom += availableHeight - croppedHeight;
		if (thumbnailClipHint.top < 0) {
		thumbnailClipHint.bottom += thumbnailClipHint.top;
		thumbnailClipHint.top = 0;
		} else if (thumbnailClipHint.bottom < 0) {
		thumbnailClipHint.top += thumbnailClipHint.bottom;
		thumbnailClipHint.bottom = 0;
		}

		thumbnailScale = targetW / (croppedWidth * scale);
		}

		if (!isRotated) {
		mMatrix.setTranslate(
		-thumbnailClipHint.left * scale,
		-thumbnailClipHint.top * scale);
		} else {
		setThumbnailRotation(deltaRotate, thumbnailBounds);
		}

		mClippedInsets.set(0, 0, 0, scaledTaskbarSize);

		mMatrix.postScale(thumbnailScale, thumbnailScale);
		mIsOrientationChanged = isOrientationDifferent;
		}

		private int getRotationDelta(int oldRotation, int newRotation) {
		int delta = newRotation - oldRotation;
		if (delta < 0) delta += 4;
		return delta;
		}

		/**
		* @param deltaRotation the number of 90 degree turns from the current orientation
		* @return {@code true} if the change in rotation results in a shift from landscape to
		* portrait or vice versa, {@code false} otherwise
		*/
		private boolean isOrientationChange(int deltaRotation) {
		return deltaRotation == Surface.ROTATION_90 \|\| deltaRotation == Surface.ROTATION_270;
		}

		private void setThumbnailRotation(int deltaRotate, Rect thumbnailPosition) {
		float translateX = 0;
		float translateY = 0;

		mMatrix.setRotate(90 * deltaRotate);
		switch (deltaRotate) { /* Counter-clockwise */
		case Surface.ROTATION_90:
		translateX = thumbnailPosition.height();
		break;
		case Surface.ROTATION_270:
		translateY = thumbnailPosition.width();
		break;
		case Surface.ROTATION_180:
		translateX = thumbnailPosition.width();
		translateY = thumbnailPosition.height();
		break;
		}
		mMatrix.postTranslate(translateX, translateY);
		}

		public RectF getClippedInsets() {
		return mClippedInsets;
		}
		}

packages/SystemUI/shared/src/com/android/systemui/shared/recents/utilities/Utilities.java

+10 −0

Original line number	Diff line number	Diff line
		@@ -62,6 +62,16 @@ public class Utilities {
		return false; // Default
		}

		/**
		* Compares the ratio of two quantities and returns whether that ratio is greater than the
		* provided bound. Order of quantities does not matter. Bound should be a decimal representation
		* of a percentage.
		*/
		public static boolean isRelativePercentDifferenceGreaterThan(float first, float second,
		float bound) {
		return (Math.abs(first - second) / Math.abs((first + second) / 2.0f)) > bound;
		}

		/** Calculates the constrast between two colors, using the algorithm provided by the WCAG v2. */
		public static float computeContrastBetweenColors(int bg, int fg) {
		float bgR = Color.red(bg) / 255f;