变灰图像我是Android新手ndk.I已开始通过图像处理示例012xxruckus和IBM博客学习。我正在尝试使图像灰白。 这里是我使用无法使用Android ndk
所显示
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<ImageView
android:id="@+id/gimageView1"
android:layout_width="400px"
android:src="@drawable/wallace"
android:layout_height="266px"
/>
<Button
android:id="@+id/gbutton"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Go Gray"
/>
<ImageView
android:id="@+id/gimageView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
</LinearLayout>
布局和Java代码的XML文件的代码
package com.example;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
public class GrayClass extends Activity {
private ImageView imageView;
private Bitmap bitmap;
private Button button;
private Bitmap original;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.gray);
original = BitmapFactory.decodeResource(getResources(), R.drawable.wallace);
bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.wallace);
button = (Button) findViewById(R.id.gbutton);
imageView = (ImageView) findViewById(R.id.gimageView2);
button.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
((ImageView)findViewById(R.id.gimageView1)).setVisibility(View.GONE);
button.setVisibility(View.GONE);
GoGray();
}
});
}
private void GoGray() {
Bitmap oBitmap = original.copy(Bitmap.Config.ARGB_8888, true);
Bitmap gBitmap = bitmap.copy(Bitmap.Config.ARGB_8888, true);
goGrayWithNative(oBitmap,gBitmap);
imageView.setImageBitmap(gBitmap);
}
public native void goGrayWithNative(Bitmap bmp1, Bitmap bmp2);
}
这里是我写的.c文件代码为灰色逻辑
/*
convertToGray
Pixel operation
*/
JNIEXPORT void JNICALL Java_com_example_GrayClass_goGrayWithNative(JNIEnv
* env, jobject obj, jobject bitmapcolor,jobject bitmapgray)
{
AndroidBitmapInfo infocolor;
void* pixelscolor;
AndroidBitmapInfo infogray;
void* pixelsgray;
int ret;
int y;
int x;
if ((ret = AndroidBitmap_getInfo(env, bitmapcolor, &infocolor)) < 0) {
LOGE("AndroidBitmap_getInfo() failed ! error=%d", ret);
return;
}
if ((ret = AndroidBitmap_getInfo(env, bitmapgray, &infogray)) < 0) {
LOGE("AndroidBitmap_getInfo() failed ! error=%d", ret);
return;
}
if (infocolor.format != ANDROID_BITMAP_FORMAT_RGBA_8888) {
LOGE("Bitmap format is not RGBA_8888 !");
return;
}
LOGE("Bitmap format is not RGBA_8888 !====%d==", infocolor.format) ;
if ((ret = AndroidBitmap_lockPixels(env, bitmapcolor, &pixelscolor)) < 0) {
LOGE("AndroidBitmap_lockPixels() failed ! error=%d", ret);
}
if ((ret = AndroidBitmap_lockPixels(env, bitmapgray, &pixelsgray)) < 0) {
LOGE("AndroidBitmap_lockPixels() failed ! error=%d", ret);
}
// modify pixels with image processing algorithm
LOGI("unlocking pixels height = %d",infocolor.height);
for(y=0;y<infocolor.height;y++) {
LOGI("unlocking pixels height = %d",infocolor.width);
argb * line = (argb *) pixelscolor;
uint8_t * grayline = (uint8_t *) pixelsgray;
for(x=0;x<infocolor.width;x++) {
grayline[x] = 0.3 * line[x].red + 0.59 * line[x].green + 0.11*line[x].blue;
}
pixelscolor = (char *)pixelscolor + infocolor.stride;
pixelsgray = (char *) pixelsgray + infogray.stride;
}
LOGI("unlocking pixels");
AndroidBitmap_unlockPixels(env, bitmapcolor);
AndroidBitmap_unlockPixels(env, bitmapgray);
}
该代码运行良好,但输出我是gett ING是不同的看到图片
点击GoGray按钮后,它显示了这样的形象
谁能告诉我哪里有错误是什么?
感谢您的宝贵回复。因为我不是一个C/C++的家伙,我不明白我如何通过重复红色,绿色和蓝色通道中的灰度值来将灰度结果存储为彩色图像,将alpha通道设置为完全不透明? – anshul
编辑我的答案推送一些代码。我比C++粉丝更像C瘾,所以这可能需要稍微调整,但我想我们离它不远。让我张贴! – mbrenon
好的,谢谢我会试试这个,让你知道进度。 – anshul