[英]OpenGL on Android - Convert a Bitmap to a Texture, and save a Texture
[英]How do you convert opengl texture back to bitmap in android?
检查http://bigflake.com/mediacodec/ExtractMpegFramesTest_egl14.java.txt中提到的saveFrame()方法
我这样做是这样的,
我使用glreadpixles()方法将纹理图像转换为位图
然后,我将位图保存到sd卡中
纹理到位图代码
public static Bitmap SavePixels(int x, int y, int w, int h){
int b[]=new int[w*(y+h)];
int bt[]=new int[w*h];
IntBuffer ib = IntBuffer.wrap(b);
ib.position(0);
GLES20.glReadPixels(0, 0, w, h, GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, ib);
for(int i=0, k=0; i<h; i++, k++)
{//remember, that OpenGL bitmap is incompatible with Android bitmap
//and so, some correction need.
for(int j=0; j<w; j++)
{
int pix=b[i*w+j];
int pb=(pix>>16)&0xff;
int pr=(pix<<16)&0x00ff0000;
int pix1=(pix&0xff00ff00) | pr | pb;
bt[(h-k-1)*w+j]=pix1;
}
}
Bitmap sb=Bitmap.createBitmap(bt, w, h, Bitmap.Config.ARGB_8888);
return sb;
}
位图到内部存储代码,
public static void saveImage(Bitmap finalBitmap) {
File myDir=new File("/sdcard/saved_images");
myDir.mkdirs();
Random generator = new Random();
int n = 10000;
n = generator.nextInt(n);
String fname = "Image-"+ n +".jpg";
File file = new File (myDir, fname);
if (file.exists ()) file.delete ();
try {
FileOutputStream out = new FileOutputStream(file);
finalBitmap.compress(Bitmap.CompressFormat.JPEG, 90, out);
out.flush();
out.close();
} catch (Exception e) {
e.printStackTrace();
}
}
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