Mega Code Archive
Bitmap Pixels
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/*
* Copyright (C) 2007 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 app.test;
import java.nio.IntBuffer;
import java.nio.ShortBuffer;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Picture;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewParent;
public class Test extends GraphicsActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(new SampleView(this));
}
private static class SampleView extends View {
private Bitmap mBitmap1;
private Bitmap mBitmap2;
private Bitmap mBitmap3;
// access the red component from a premultiplied color
private static int getR32(int c) {
return (c >> 0) & 0xFF;
}
// access the red component from a premultiplied color
private static int getG32(int c) {
return (c >> 8) & 0xFF;
}
// access the red component from a premultiplied color
private static int getB32(int c) {
return (c >> 16) & 0xFF;
}
// access the red component from a premultiplied color
private static int getA32(int c) {
return (c >> 24) & 0xFF;
}
/**
* This takes components that are already in premultiplied form, and
* packs them into an int in the correct device order.
*/
private static int pack8888(int r, int g, int b, int a) {
return (r << 0) | (g << 8) | (b << 16) | (a << 24);
}
private static short pack565(int r, int g, int b) {
return (short) ((r << 11) | (g << 5) | (b << 0));
}
private static short pack4444(int r, int g, int b, int a) {
return (short) ((a << 0) | (b << 4) | (g << 8) | (r << 12));
}
private static int mul255(int c, int a) {
int prod = c * a + 128;
return (prod + (prod >> 8)) >> 8;
}
/**
* Turn a color int into a premultiplied device color
*/
private static int premultiplyColor(int c) {
int r = Color.red(c);
int g = Color.green(c);
int b = Color.blue(c);
int a = Color.alpha(c);
// now apply the alpha to r, g, b
r = mul255(r, a);
g = mul255(g, a);
b = mul255(b, a);
// now pack it in the correct order
return pack8888(r, g, b, a);
}
private static void makeRamp(int from, int to, int n, int[] ramp8888,
short[] ramp565, short[] ramp4444) {
int r = getR32(from) << 23;
int g = getG32(from) << 23;
int b = getB32(from) << 23;
int a = getA32(from) << 23;
// now compute our step amounts per componenet (biased by 23 bits)
int dr = ((getR32(to) << 23) - r) / (n - 1);
int dg = ((getG32(to) << 23) - g) / (n - 1);
int db = ((getB32(to) << 23) - b) / (n - 1);
int da = ((getA32(to) << 23) - a) / (n - 1);
for (int i = 0; i < n; i++) {
ramp8888[i] = pack8888(r >> 23, g >> 23, b >> 23, a >> 23);
ramp565[i] = pack565(r >> (23 + 3), g >> (23 + 2),
b >> (23 + 3));
ramp4444[i] = pack4444(r >> (23 + 4), g >> (23 + 4),
b >> (23 + 4), a >> (23 + 4));
r += dr;
g += dg;
b += db;
a += da;
}
}
private static IntBuffer makeBuffer(int[] src, int n) {
IntBuffer dst = IntBuffer.allocate(n * n);
for (int i = 0; i < n; i++) {
dst.put(src);
}
dst.rewind();
return dst;
}
private static ShortBuffer makeBuffer(short[] src, int n) {
ShortBuffer dst = ShortBuffer.allocate(n * n);
for (int i = 0; i < n; i++) {
dst.put(src);
}
dst.rewind();
return dst;
}
public SampleView(Context context) {
super(context);
setFocusable(true);
final int N = 100;
int[] data8888 = new int[N];
short[] data565 = new short[N];
short[] data4444 = new short[N];
makeRamp(premultiplyColor(Color.RED),
premultiplyColor(Color.GREEN), N, data8888, data565,
data4444);
mBitmap1 = Bitmap.createBitmap(N, N, Bitmap.Config.ARGB_8888);
mBitmap2 = Bitmap.createBitmap(N, N, Bitmap.Config.RGB_565);
mBitmap3 = Bitmap.createBitmap(N, N, Bitmap.Config.ARGB_4444);
mBitmap1.copyPixelsFromBuffer(makeBuffer(data8888, N));
mBitmap2.copyPixelsFromBuffer(makeBuffer(data565, N));
mBitmap3.copyPixelsFromBuffer(makeBuffer(data4444, N));
}
@Override
protected void onDraw(Canvas canvas) {
canvas.drawColor(0xFFCCCCCC);
int y = 10;
canvas.drawBitmap(mBitmap1, 10, y, null);
y += mBitmap1.getHeight() + 10;
canvas.drawBitmap(mBitmap2, 10, y, null);
y += mBitmap2.getHeight() + 10;
canvas.drawBitmap(mBitmap3, 10, y, null);
}
}
}
class GraphicsActivity extends Activity {
// set to true to test Picture
private static final boolean TEST_PICTURE = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public void setContentView(View view) {
if (TEST_PICTURE) {
ViewGroup vg = new PictureLayout(this);
vg.addView(view);
view = vg;
}
super.setContentView(view);
}
}
class PictureLayout extends ViewGroup {
private final Picture mPicture = new Picture();
public PictureLayout(Context context) {
super(context);
}
public PictureLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
public void addView(View child) {
if (getChildCount() > 1) {
throw new IllegalStateException(
"PictureLayout can host only one direct child");
}
super.addView(child);
}
@Override
public void addView(View child, int index) {
if (getChildCount() > 1) {
throw new IllegalStateException(
"PictureLayout can host only one direct child");
}
super.addView(child, index);
}
@Override
public void addView(View child, LayoutParams params) {
if (getChildCount() > 1) {
throw new IllegalStateException(
"PictureLayout can host only one direct child");
}
super.addView(child, params);
}
@Override
public void addView(View child, int index, LayoutParams params) {
if (getChildCount() > 1) {
throw new IllegalStateException(
"PictureLayout can host only one direct child");
}
super.addView(child, index, params);
}
@Override
protected LayoutParams generateDefaultLayoutParams() {
return new LayoutParams(LayoutParams.MATCH_PARENT,
LayoutParams.MATCH_PARENT);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
final int count = getChildCount();
int maxHeight = 0;
int maxWidth = 0;
for (int i = 0; i < count; i++) {
final View child = getChildAt(i);
if (child.getVisibility() != GONE) {
measureChild(child, widthMeasureSpec, heightMeasureSpec);
}
}
maxWidth += getPaddingLeft() + getPaddingRight();
maxHeight += getPaddingTop() + getPaddingBottom();
Drawable drawable = getBackground();
if (drawable != null) {
maxHeight = Math.max(maxHeight, drawable.getMinimumHeight());
maxWidth = Math.max(maxWidth, drawable.getMinimumWidth());
}
setMeasuredDimension(resolveSize(maxWidth, widthMeasureSpec),
resolveSize(maxHeight, heightMeasureSpec));
}
private void drawPict(Canvas canvas, int x, int y, int w, int h, float sx,
float sy) {
canvas.save();
canvas.translate(x, y);
canvas.clipRect(0, 0, w, h);
canvas.scale(0.5f, 0.5f);
canvas.scale(sx, sy, w, h);
canvas.drawPicture(mPicture);
canvas.restore();
}
@Override
protected void dispatchDraw(Canvas canvas) {
super.dispatchDraw(mPicture.beginRecording(getWidth(), getHeight()));
mPicture.endRecording();
int x = getWidth() / 2;
int y = getHeight() / 2;
if (false) {
canvas.drawPicture(mPicture);
} else {
drawPict(canvas, 0, 0, x, y, 1, 1);
drawPict(canvas, x, 0, x, y, -1, 1);
drawPict(canvas, 0, y, x, y, 1, -1);
drawPict(canvas, x, y, x, y, -1, -1);
}
}
@Override
public ViewParent invalidateChildInParent(int[] location, Rect dirty) {
location[0] = getLeft();
location[1] = getTop();
dirty.set(0, 0, getWidth(), getHeight());
return getParent();
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
final int count = super.getChildCount();
for (int i = 0; i < count; i++) {
final View child = getChildAt(i);
if (child.getVisibility() != GONE) {
final int childLeft = getPaddingLeft();
final int childTop = getPaddingTop();
child.layout(childLeft, childTop,
childLeft + child.getMeasuredWidth(),
childTop + child.getMeasuredHeight());
}
}
}
}
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