Automatic sources dropoff on 2020-06-10 18:32:38.095721
The change is generated with prebuilt drop tool.
Change-Id: I24cbf6ba6db262a1ae1445db1427a08fee35b3b4
diff --git a/android/graphics/BlendComposite.java b/android/graphics/BlendComposite.java
new file mode 100644
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+++ b/android/graphics/BlendComposite.java
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+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.graphics;
+
+import java.awt.Composite;
+import java.awt.CompositeContext;
+import java.awt.RenderingHints;
+import java.awt.image.ColorModel;
+import java.awt.image.DataBuffer;
+import java.awt.image.Raster;
+import java.awt.image.WritableRaster;
+
+/*
+ * (non-Javadoc)
+ * The class is adapted from a demo tool for Blending Modes written by
+ * Romain Guy ([email protected]). The tool is available at
+ * http://www.curious-creature.org/2006/09/20/new-blendings-modes-for-java2d/
+ *
+ * This class has been adapted for applying color filters. When applying color filters, the src
+ * image should not extend beyond the dest image, but in our implementation of the filters, it does.
+ * To compensate for the effect, we recompute the alpha value of the src image before applying
+ * the color filter as it should have been applied.
+ */
+public final class BlendComposite implements Composite {
+ public enum BlendingMode {
+ MULTIPLY(),
+ SCREEN(),
+ DARKEN(),
+ LIGHTEN(),
+ OVERLAY(),
+ ADD();
+
+ private final BlendComposite mComposite;
+
+ BlendingMode() {
+ mComposite = new BlendComposite(this);
+ }
+
+ BlendComposite getBlendComposite() {
+ return mComposite;
+ }
+ }
+
+ private float alpha;
+ private BlendingMode mode;
+
+ private BlendComposite(BlendingMode mode) {
+ this(mode, 1.0f);
+ }
+
+ private BlendComposite(BlendingMode mode, float alpha) {
+ this.mode = mode;
+ setAlpha(alpha);
+ }
+
+ public static BlendComposite getInstance(BlendingMode mode) {
+ return mode.getBlendComposite();
+ }
+
+ public static BlendComposite getInstance(BlendingMode mode, float alpha) {
+ if (alpha > 0.9999f) {
+ return getInstance(mode);
+ }
+ return new BlendComposite(mode, alpha);
+ }
+
+ public float getAlpha() {
+ return alpha;
+ }
+
+ public BlendingMode getMode() {
+ return mode;
+ }
+
+ private void setAlpha(float alpha) {
+ if (alpha < 0.0f || alpha > 1.0f) {
+ assert false : "alpha must be comprised between 0.0f and 1.0f";
+ alpha = Math.min(alpha, 1.0f);
+ alpha = Math.max(alpha, 0.0f);
+ }
+
+ this.alpha = alpha;
+ }
+
+ @Override
+ public int hashCode() {
+ return Float.floatToIntBits(alpha) * 31 + mode.ordinal();
+ }
+
+ @Override
+ public boolean equals(Object obj) {
+ if (!(obj instanceof BlendComposite)) {
+ return false;
+ }
+
+ BlendComposite bc = (BlendComposite) obj;
+
+ return mode == bc.mode && alpha == bc.alpha;
+ }
+
+ public CompositeContext createContext(ColorModel srcColorModel,
+ ColorModel dstColorModel,
+ RenderingHints hints) {
+ return new BlendingContext(this);
+ }
+
+ private static final class BlendingContext implements CompositeContext {
+ private final Blender blender;
+ private final BlendComposite composite;
+
+ private BlendingContext(BlendComposite composite) {
+ this.composite = composite;
+ this.blender = Blender.getBlenderFor(composite);
+ }
+
+ public void dispose() {
+ }
+
+ public void compose(Raster src, Raster dstIn, WritableRaster dstOut) {
+ if (src.getSampleModel().getDataType() != DataBuffer.TYPE_INT ||
+ dstIn.getSampleModel().getDataType() != DataBuffer.TYPE_INT ||
+ dstOut.getSampleModel().getDataType() != DataBuffer.TYPE_INT) {
+ throw new IllegalStateException(
+ "Source and destination must store pixels as INT.");
+ }
+
+ int width = Math.min(src.getWidth(), dstIn.getWidth());
+ int height = Math.min(src.getHeight(), dstIn.getHeight());
+
+ float alpha = composite.getAlpha();
+
+ int[] srcPixel = new int[4];
+ int[] dstPixel = new int[4];
+ int[] result = new int[4];
+ int[] srcPixels = new int[width];
+ int[] dstPixels = new int[width];
+
+ for (int y = 0; y < height; y++) {
+ dstIn.getDataElements(0, y, width, 1, dstPixels);
+ if (alpha != 0) {
+ src.getDataElements(0, y, width, 1, srcPixels);
+ for (int x = 0; x < width; x++) {
+ // pixels are stored as INT_ARGB
+ // our arrays are [R, G, B, A]
+ int pixel = srcPixels[x];
+ srcPixel[0] = (pixel >> 16) & 0xFF;
+ srcPixel[1] = (pixel >> 8) & 0xFF;
+ srcPixel[2] = (pixel ) & 0xFF;
+ srcPixel[3] = (pixel >> 24) & 0xFF;
+
+ pixel = dstPixels[x];
+ dstPixel[0] = (pixel >> 16) & 0xFF;
+ dstPixel[1] = (pixel >> 8) & 0xFF;
+ dstPixel[2] = (pixel ) & 0xFF;
+ dstPixel[3] = (pixel >> 24) & 0xFF;
+
+ // ---- Modified from original ----
+ // recompute src pixel for transparency.
+ srcPixel[3] *= dstPixel[3] / 0xFF;
+ // ---- Modification ends ----
+
+ result = blender.blend(srcPixel, dstPixel, result);
+
+ // mixes the result with the opacity
+ if (alpha == 1) {
+ dstPixels[x] = (result[3] & 0xFF) << 24 |
+ (result[0] & 0xFF) << 16 |
+ (result[1] & 0xFF) << 8 |
+ result[2] & 0xFF;
+ } else {
+ dstPixels[x] =
+ ((int) (dstPixel[3] + (result[3] - dstPixel[3]) * alpha) & 0xFF) << 24 |
+ ((int) (dstPixel[0] + (result[0] - dstPixel[0]) * alpha) & 0xFF) << 16 |
+ ((int) (dstPixel[1] + (result[1] - dstPixel[1]) * alpha) & 0xFF) << 8 |
+ (int) (dstPixel[2] + (result[2] - dstPixel[2]) * alpha) & 0xFF;
+ }
+
+ }
+ }
+ dstOut.setDataElements(0, y, width, 1, dstPixels);
+ }
+ }
+ }
+
+ private static abstract class Blender {
+ public abstract int[] blend(int[] src, int[] dst, int[] result);
+
+ public static Blender getBlenderFor(BlendComposite composite) {
+ switch (composite.getMode()) {
+ case ADD:
+ return new Blender() {
+ @Override
+ public int[] blend(int[] src, int[] dst, int[] result) {
+ for (int i = 0; i < 4; i++) {
+ result[i] = Math.min(255, src[i] + dst[i]);
+ }
+ return result;
+ }
+ };
+ case DARKEN:
+ return new Blender() {
+ @Override
+ public int[] blend(int[] src, int[] dst, int[] result) {
+ for (int i = 0; i < 3; i++) {
+ result[i] = Math.min(src[i], dst[i]);
+ }
+ result[3] = Math.min(255, src[3] + dst[3]);
+ return result;
+ }
+ };
+ case LIGHTEN:
+ return new Blender() {
+ @Override
+ public int[] blend(int[] src, int[] dst, int[] result) {
+ for (int i = 0; i < 3; i++) {
+ result[i] = Math.max(src[i], dst[i]);
+ }
+ result[3] = Math.min(255, src[3] + dst[3]);
+ return result;
+ }
+ };
+ case MULTIPLY:
+ return new Blender() {
+ @Override
+ public int[] blend(int[] src, int[] dst, int[] result) {
+ for (int i = 0; i < 3; i++) {
+ result[i] = (src[i] * dst[i]) >> 8;
+ }
+ result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
+ return result;
+ }
+ };
+ case OVERLAY:
+ return new Blender() {
+ @Override
+ public int[] blend(int[] src, int[] dst, int[] result) {
+ for (int i = 0; i < 3; i++) {
+ result[i] = dst[i] < 128 ? dst[i] * src[i] >> 7 :
+ 255 - ((255 - dst[i]) * (255 - src[i]) >> 7);
+ }
+ result[3] = Math.min(255, src[3] + dst[3]);
+ return result;
+ }
+ };
+ case SCREEN:
+ return new Blender() {
+ @Override
+ public int[] blend(int[] src, int[] dst, int[] result) {
+ result[0] = 255 - ((255 - src[0]) * (255 - dst[0]) >> 8);
+ result[1] = 255 - ((255 - src[1]) * (255 - dst[1]) >> 8);
+ result[2] = 255 - ((255 - src[2]) * (255 - dst[2]) >> 8);
+ result[3] = Math.min(255, src[3] + dst[3]);
+ return result;
+ }
+ };
+ default:
+ assert false : "Blender not implement for " + composite.getMode().name();
+
+ // Ignore the blend
+ return new Blender() {
+ @Override
+ public int[] blend(int[] src, int[] dst, int[] result) {
+ result[0] = dst[0];
+ result[1] = dst[1];
+ result[2] = dst[2];
+ result[3] = dst[3];
+ return result;
+ }
+ };
+ }
+ }
+ }
+}
