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A library jar that provides APIs for Applications written for the Google Android Platform.
/*
* Copyright (C) 2019 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 com.android.systemui.glwallpaper;
import static android.opengl.GLES20.GL_FLOAT;
import static android.opengl.GLES20.GL_LINEAR;
import static android.opengl.GLES20.GL_TEXTURE0;
import static android.opengl.GLES20.GL_TEXTURE_2D;
import static android.opengl.GLES20.GL_TEXTURE_MAG_FILTER;
import static android.opengl.GLES20.GL_TEXTURE_MIN_FILTER;
import static android.opengl.GLES20.GL_TRIANGLES;
import static android.opengl.GLES20.glActiveTexture;
import static android.opengl.GLES20.glBindTexture;
import static android.opengl.GLES20.glDrawArrays;
import static android.opengl.GLES20.glEnableVertexAttribArray;
import static android.opengl.GLES20.glGenTextures;
import static android.opengl.GLES20.glTexParameteri;
import static android.opengl.GLES20.glUniform1i;
import static android.opengl.GLES20.glVertexAttribPointer;
import android.graphics.Bitmap;
import android.graphics.Rect;
import android.opengl.GLUtils;
import android.util.Log;
import java.io.FileDescriptor;
import java.io.PrintWriter;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;
/**
* This class takes charge of the geometry data like vertices and texture coordinates.
* It delivers these data to opengl runtime and triggers draw calls if necessary.
*/
class ImageGLWallpaper {
private static final String TAG = ImageGLWallpaper.class.getSimpleName();
static final String A_POSITION = "aPosition";
static final String A_TEXTURE_COORDINATES = "aTextureCoordinates";
static final String U_PER85 = "uPer85";
static final String U_REVEAL = "uReveal";
static final String U_AOD2OPACITY = "uAod2Opacity";
static final String U_TEXTURE = "uTexture";
private static final int HANDLE_UNDEFINED = -1;
private static final int POSITION_COMPONENT_COUNT = 2;
private static final int TEXTURE_COMPONENT_COUNT = 2;
private static final int BYTES_PER_FLOAT = 4;
// Vertices to define the square with 2 triangles.
private static final float[] VERTICES = {
-1.0f, -1.0f,
+1.0f, -1.0f,
+1.0f, +1.0f,
+1.0f, +1.0f,
-1.0f, +1.0f,
-1.0f, -1.0f
};
// Texture coordinates that maps to vertices.
private static final float[] TEXTURES = {
0f, 1f,
1f, 1f,
1f, 0f,
1f, 0f,
0f, 0f,
0f, 1f
};
private final FloatBuffer mVertexBuffer;
private final FloatBuffer mTextureBuffer;
private final ImageGLProgram mProgram;
private int mAttrPosition;
private int mAttrTextureCoordinates;
private int mUniAod2Opacity;
private int mUniPer85;
private int mUniReveal;
private int mUniTexture;
private int mTextureId;
private float[] mCurrentTexCoordinate;
ImageGLWallpaper(ImageGLProgram program) {
mProgram = program;
// Create an float array in opengles runtime (native) and put vertex data.
mVertexBuffer = ByteBuffer.allocateDirect(VERTICES.length * BYTES_PER_FLOAT)
.order(ByteOrder.nativeOrder())
.asFloatBuffer();
mVertexBuffer.put(VERTICES);
mVertexBuffer.position(0);
// Create an float array in opengles runtime (native) and put texture data.
mTextureBuffer = ByteBuffer.allocateDirect(TEXTURES.length * BYTES_PER_FLOAT)
.order(ByteOrder.nativeOrder())
.asFloatBuffer();
mTextureBuffer.put(TEXTURES);
mTextureBuffer.position(0);
}
void setup(Bitmap bitmap) {
setupAttributes();
setupUniforms();
setupTexture(bitmap);
}
private void setupAttributes() {
mAttrPosition = mProgram.getAttributeHandle(A_POSITION);
mVertexBuffer.position(0);
glVertexAttribPointer(mAttrPosition, POSITION_COMPONENT_COUNT, GL_FLOAT,
false, 0, mVertexBuffer);
glEnableVertexAttribArray(mAttrPosition);
mAttrTextureCoordinates = mProgram.getAttributeHandle(A_TEXTURE_COORDINATES);
mTextureBuffer.position(0);
glVertexAttribPointer(mAttrTextureCoordinates, TEXTURE_COMPONENT_COUNT, GL_FLOAT,
false, 0, mTextureBuffer);
glEnableVertexAttribArray(mAttrTextureCoordinates);
}
private void setupUniforms() {
mUniAod2Opacity = mProgram.getUniformHandle(U_AOD2OPACITY);
mUniPer85 = mProgram.getUniformHandle(U_PER85);
mUniReveal = mProgram.getUniformHandle(U_REVEAL);
mUniTexture = mProgram.getUniformHandle(U_TEXTURE);
}
int getHandle(String name) {
switch (name) {
case A_POSITION:
return mAttrPosition;
case A_TEXTURE_COORDINATES:
return mAttrTextureCoordinates;
case U_AOD2OPACITY:
return mUniAod2Opacity;
case U_PER85:
return mUniPer85;
case U_REVEAL:
return mUniReveal;
case U_TEXTURE:
return mUniTexture;
default:
return HANDLE_UNDEFINED;
}
}
void draw() {
glDrawArrays(GL_TRIANGLES, 0, VERTICES.length / 2);
}
private void setupTexture(Bitmap bitmap) {
final int[] tids = new int[1];
if (bitmap == null) {
Log.w(TAG, "setupTexture: invalid bitmap");
return;
}
// Generate one texture object and store the id in tids[0].
glGenTextures(1, tids, 0);
if (tids[0] == 0) {
Log.w(TAG, "setupTexture: glGenTextures() failed");
return;
}
// Bind a named texture to a target.
glBindTexture(GL_TEXTURE_2D, tids[0]);
// Load the bitmap data and copy it over into the texture object that is currently bound.
GLUtils.texImage2D(GL_TEXTURE_2D, 0, bitmap, 0);
// Use bilinear texture filtering when minification.
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
// Use bilinear texture filtering when magnification.
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
mTextureId = tids[0];
}
void useTexture() {
// Set the active texture unit to texture unit 0.
glActiveTexture(GL_TEXTURE0);
// Bind the texture to this unit.
glBindTexture(GL_TEXTURE_2D, mTextureId);
// Let the texture sampler in fragment shader to read form this texture unit.
glUniform1i(mUniTexture, 0);
}
/**
* This method adjust s(x-axis), t(y-axis) texture coordinates to get current display area
* of texture and will be used during transition.
* The adjustment happens if either the width or height of the surface is larger than
* corresponding size of the display area.
* If both width and height are larger than corresponding size of the display area,
* the adjustment will happen at both s, t side.
*
* @param surface The size of the surface.
* @param scissor The display area.
* @param xOffset The offset amount along s axis.
* @param yOffset The offset amount along t axis.
*/
void adjustTextureCoordinates(Rect surface, Rect scissor, float xOffset, float yOffset) {
mCurrentTexCoordinate = TEXTURES.clone();
if (surface == null || scissor == null) {
mTextureBuffer.put(mCurrentTexCoordinate);
mTextureBuffer.position(0);
return;
}
int surfaceWidth = surface.width();
int surfaceHeight = surface.height();
int scissorWidth = scissor.width();
int scissorHeight = scissor.height();
if (surfaceWidth > scissorWidth) {
// Calculate the new s pos in pixels.
float pixelS = (float) Math.round((surfaceWidth - scissorWidth) * xOffset);
// Calculate the s pos in texture coordinate.
float coordinateS = pixelS / surfaceWidth;
// Calculate the percentage occupied by the scissor width in surface width.
float surfacePercentageW = (float) scissorWidth / surfaceWidth;
// Need also consider the case if surface height is smaller than scissor height.
if (surfaceHeight < scissorHeight) {
// We will narrow the surface percentage to keep aspect ratio.
surfacePercentageW *= (float) surfaceHeight / scissorHeight;
}
// Determine the final s pos, also limit the legal s pos to prevent from out of range.
float s = coordinateS + surfacePercentageW > 1f ? 1f - surfacePercentageW : coordinateS;
// Traverse the s pos in texture coordinates array and adjust the s pos accordingly.
for (int i = 0; i < mCurrentTexCoordinate.length; i += 2) {
// indices 2, 4 and 6 are the end of s coordinates.
if (i == 2 || i == 4 || i == 6) {
mCurrentTexCoordinate[i] = Math.min(1f, s + surfacePercentageW);
} else {
mCurrentTexCoordinate[i] = s;
}
}
}
if (surfaceHeight > scissorHeight) {
// Calculate the new t pos in pixels.
float pixelT = (float) Math.round((surfaceHeight - scissorHeight) * yOffset);
// Calculate the t pos in texture coordinate.
float coordinateT = pixelT / surfaceHeight;
// Calculate the percentage occupied by the scissor height in surface height.
float surfacePercentageH = (float) scissorHeight / surfaceHeight;
// Need also consider the case if surface width is smaller than scissor width.
if (surfaceWidth < scissorWidth) {
// We will narrow the surface percentage to keep aspect ratio.
surfacePercentageH *= (float) surfaceWidth / scissorWidth;
}
// Determine the final t pos, also limit the legal t pos to prevent from out of range.
float t = coordinateT + surfacePercentageH > 1f ? 1f - surfacePercentageH : coordinateT;
// Traverse the t pos in texture coordinates array and adjust the t pos accordingly.
for (int i = 1; i < mCurrentTexCoordinate.length; i += 2) {
// indices 1, 3 and 11 are the end of t coordinates.
if (i == 1 || i == 3 || i == 11) {
mCurrentTexCoordinate[i] = Math.min(1f, t + surfacePercentageH);
} else {
mCurrentTexCoordinate[i] = t;
}
}
}
mTextureBuffer.put(mCurrentTexCoordinate);
mTextureBuffer.position(0);
}
/**
* Called to dump current state.
* @param prefix prefix.
* @param fd fd.
* @param out out.
* @param args args.
*/
public void dump(String prefix, FileDescriptor fd, PrintWriter out, String[] args) {
StringBuilder sb = new StringBuilder();
sb.append('{');
if (mCurrentTexCoordinate != null) {
for (int i = 0; i < mCurrentTexCoordinate.length; i++) {
sb.append(mCurrentTexCoordinate[i]).append(',');
if (i == mCurrentTexCoordinate.length - 1) {
sb.deleteCharAt(sb.length() - 1);
}
}
}
sb.append('}');
out.print(prefix); out.print("mTexCoordinates="); out.println(sb.toString());
}
}
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