第一步创建 ui
<?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"
android:background="#ffffffff"
>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/btnReset"
android:text="Reset"
android:visibility="visible"
android:onClick="onResetImage"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/btnConvert"
android:text="Convert Image"
android:visibility="visible"
android:onClick="onConvertToGray"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/btnFindEdges"
android:text="Find Edges"
android:visibility="visible"
android:onClick="onFindEdges"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/btnDimmer"
android:text="- "
android:visibility="visible"
android:onClick="onDimmer"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/btnBrighter"
android:text=" +"
android:visibility="visible"
android:onClick="onBrighter"
/>
</LinearLayout>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:scaleType="centerCrop"
android:layout_gravity="center_vertical|center_horizontal"
android:id="@+id/ivDisplay"
/>
</LinearLayout>
第二步，写activity MainActivity
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.graphics.BitmapFactory;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.view.View;
import android.widget.ImageView;
public class IBMPhotoPhun extends Activity {
private String tag = "IBMPhotoPhun";
private Bitmap bitmapOrig = null;
private Bitmap bitmapGray = null;
private Bitmap bitmapWip = null;
private ImageView ivDisplay = null;
// NDK STUFF
static {
System.loadLibrary("ibmphotophun");
}
public native void convertToGray(Bitmap bitmapIn,Bitmap bitmapOut);
public native void changeBrightness(int direction,Bitmap bitmap);
public native void findEdges(Bitmap bitmapIn,Bitmap bitmapOut);
// END NDK STUFF
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Log.i(tag,"before image stuff");
ivDisplay = (ImageView) findViewById(R.id.ivDisplay);
// load bitmap from resources
BitmapFactory.Options options = new BitmapFactory.Options();
// Make sure it is 24 bit color as our image processing algorithm
// expects this format
options.inPreferredConfig = Config.ARGB_8888;
bitmapOrig = BitmapFactory.decodeResource(this.getResources(),
R.drawable.sampleimage,options);
if (bitmapOrig != null)
ivDisplay.setImageBitmap(bitmapOrig);
}
public void onResetImage(View v) {
Log.i(tag,"onResetImage");
ivDisplay.setImageBitmap(bitmapOrig);
}
public void onFindEdges(View v) {
Log.i(tag,"onFindEdges");
// make sure our target bitmaps are happy
bitmapGray = Bitmap.createBitmap(bitmapOrig.getWidth(),bitmapOrig.getHeight(),
Config.ALPHA_8);
bitmapWip = Bitmap.createBitmap(bitmapOrig.getWidth(),bitmapOrig.getHeight(),
Config.ALPHA_8);
// before finding edges, we need to convert this image to gray
convertToGray(bitmapOrig,bitmapGray);
// find edges in the image
findEdges(bitmapGray,bitmapWip);
ivDisplay.setImageBitmap(bitmapWip);
}
public void onConvertToGray(View v) {
Log.i(tag,"onConvertToGray");
bitmapWip = Bitmap.createBitmap(bitmapOrig.getWidth(),bitmapOrig.getHeight(),
Config.ALPHA_8);
convertToGray(bitmapOrig,bitmapWip);
ivDisplay.setImageBitmap(bitmapWip);
}
public void onDimmer(View v) {
Log.i(tag,"onDimmer");
changeBrightness(2,bitmapWip);
ivDisplay.setImageBitmap(bitmapWip);
}
public void onBrighter(View v) {
Log.i(tag,"onBrighter");
changeBrightness(1,bitmapWip);
ivDisplay.setImageBitmap(bitmapWip);
}
}
Android.mk
LOCAL_PATH := $(call my-dir) include $(CLEAR_VARS) LOCAL_MODULE := ibmphotophun LOCAL_SRC_FILES := ibmphotophun.c LOCAL_LDLIBS := -llog -ljnigraphics include $(BUILD_SHARED_LIBRARY)
增加宏
/*
* ibmphotophun.c
*
* Author: Frank Ableson
* Contact Info: fableson@msiservices.com
*/
#include <jni.h>
#include <android/log.h>
#include <android/bitmap.h>
#define LOG_TAG "libibmphotophun"
#define LOGI(...) __android_log_print(ANDROID_LOG_INFO,LOG_TAG,__VA_ARGS__)
#define LOGE(...) __android_log_print(ANDROID_LOG_ERROR,LOG_TAG,__VA_ARGS__)
typedef struct
{
uint8_t alpha;
uint8_t red;
uint8_t green;
uint8_t blue;
} argb;
/*
convertToGray
Pixel operation
*/
JNIEXPORT void JNICALL Java_com_msi_ibm_ndk_IBMPhotoPhun_convertToGray(JNIEnv
* env, jobject obj, jobject bitmapcolor,jobject bitmapgray)
{
AndroidBitmapInfo infocolor;
void* pixelscolor;
AndroidBitmapInfo infogray;
void* pixelsgray;
int ret;
int y;
int x;
LOGI("convertToGray");
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;
}
LOGI("color image :: width is %d; height is %d; stride is %d; format is %d;flags is
%d",infocolor.width,infocolor.height,infocolor.stride,infocolor.format,infocolor.flags);
if (infocolor.format != ANDROID_BITMAP_FORMAT_RGBA_8888) {
LOGE("Bitmap format is not RGBA_8888 !");
return;
}
LOGI("gray image :: width is %d; height is %d; stride is %d; format is %d;flags is
%d",infogray.width,infogray.height,infogray.stride,infogray.format,infogray.flags);
if (infogray.format != ANDROID_BITMAP_FORMAT_A_8) {
LOGE("Bitmap format is not A_8 !");
return;
}
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
for (y=0;y<infocolor.height;y++) {
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);
}
/*
changeBrightness
Pixel Operation
*/
JNIEXPORT void JNICALL Java_com_msi_ibm_ndk_IBMPhotoPhun_changeBrightness(JNIEnv
* env, jobject obj, int direction,jobject bitmap)
{
AndroidBitmapInfo infogray;
void* pixelsgray;
int ret;
int y;
int x;
uint8_t save;
if ((ret = AndroidBitmap_getInfo(env, bitmap, &infogray)) < 0) {
LOGE("AndroidBitmap_getInfo() failed ! error=%d", ret);
return;
}
LOGI("gray image :: width is %d; height is %d; stride is %d; format is %d;flags is
%d",infogray.width,infogray.height,infogray.stride,infogray.format,infogray.flags);
if (infogray.format != ANDROID_BITMAP_FORMAT_A_8) {
LOGE("Bitmap format is not A_8 !");
return;
}
if ((ret = AndroidBitmap_lockPixels(env, bitmap, &pixelsgray)) < 0) {
LOGE("AndroidBitmap_lockPixels() failed ! error=%d", ret);
}
// modify pixels with image processing algorithm
LOGI("time to modify pixels....");
for (y=0;y<infogray.height;y++) {
uint8_t * grayline = (uint8_t *) pixelsgray;
int v;
for (x=0;x<infogray.width;x++) {
v = (int) grayline[x];
if (direction == 1)
v -=5;
else
v += 5;
if (v >= 255) {
grayline[x] = 255;
} else if (v <= 0) {
grayline[x] = 0;
} else {
grayline[x] = (uint8_t) v;
}
}
pixelsgray = (char *) pixelsgray + infogray.stride;
}
AndroidBitmap_unlockPixels(env, bitmap);
}
/*
findEdges
Matrix operation
*/
JNIEXPORT void JNICALL Java_com_msi_ibm_ndk_IBMPhotoPhun_findEdges(JNIEnv
* env, jobject obj, jobject bitmapgray,jobject bitmapedges)
{
AndroidBitmapInfo infogray;
void* pixelsgray;
AndroidBitmapInfo infoedges;
void* pixelsedge;
int ret;
int y;
int x;
int sumX,sumY,sum;
int i,j;
int Gx[3][3];
int Gy[3][3];
uint8_t *graydata;
uint8_t *edgedata;
LOGI("findEdges running");
Gx[0][0] = -1;Gx[0][1] = 0;Gx[0][2] = 1;
Gx[1][0] = -2;Gx[1][1] = 0;Gx[1][2] = 2;
Gx[2][0] = -1;Gx[2][1] = 0;Gx[2][2] = 1;
Gy[0][0] = 1;Gy[0][1] = 2;Gy[0][2] = 1;
Gy[1][0] = 0;Gy[1][1] = 0;Gy[1][2] = 0;
Gy[2][0] = -1;Gy[2][1] = -2;Gy[2][2] = -1;
if ((ret = AndroidBitmap_getInfo(env, bitmapgray, &infogray)) < 0) {
LOGE("AndroidBitmap_getInfo() failed ! error=%d", ret);
return;
}
if ((ret = AndroidBitmap_getInfo(env, bitmapedges, &infoedges)) < 0) {
LOGE("AndroidBitmap_getInfo() failed ! error=%d", ret);
return;
}
LOGI("gray image :: width is %d; height is %d; stride is %d; format is %d;flags is
%d",infogray.width,infogray.height,infogray.stride,infogray.format,infogray.flags);
if (infogray.format != ANDROID_BITMAP_FORMAT_A_8) {
LOGE("Bitmap format is not A_8 !");
return;
}
LOGI("color image :: width is %d; height is %d; stride is %d; format is %d;flags is
%d",infoedges.width,infoedges.height,infoedges.stride,infoedges.format,infoedges.flags);
if (infoedges.format != ANDROID_BITMAP_FORMAT_A_8) {
LOGE("Bitmap format is not A_8 !");
return;
}
if ((ret = AndroidBitmap_lockPixels(env, bitmapgray, &pixelsgray)) < 0) {
LOGE("AndroidBitmap_lockPixels() failed ! error=%d", ret);
}
if ((ret = AndroidBitmap_lockPixels(env, bitmapedges, &pixelsedge)) < 0) {
LOGE("AndroidBitmap_lockPixels() failed ! error=%d", ret);
}
// modify pixels with image processing algorithm
LOGI("time to modify pixels....");
graydata = (uint8_t *) pixelsgray;
edgedata = (uint8_t *) pixelsedge;
for (y=0;y<=infogray.height - 1;y++) {
for (x=0;x<infogray.width -1;x++) {
sumX = 0;
sumY = 0;
// check boundaries
if (y==0 || y == infogray.height-1) {
sum = 0;
} else if (x == 0 || x == infogray.width -1) {
sum = 0;
} else {
// calc X gradient
for (i=-1;i<=1;i++) {
for (j=-1;j<=1;j++) {
sumX += (int) ( (*(graydata + x + i + (y + j)
* infogray.stride)) * Gx[i+1][j+1]);
}
}
// calc Y gradient
for (i=-1;i<=1;i++) {
for (j=-1;j<=1;j++) {
sumY += (int) ( (*(graydata + x + i + (y + j)
* infogray.stride)) * Gy[i+1][j+1]);
}
}
sum = abs(sumX) + abs(sumY);
}
if (sum>255) sum = 255;
if (sum<0) sum = 0;
*(edgedata + x + y*infogray.width) = 255 - (uint8_t) sum;
}
}
AndroidBitmap_unlockPixels(env, bitmapgray);
AndroidBitmap_unlockPixels(env, bitmapedges);
}