/**
* Decodes a bitmap from a file containing it minimizing the memory use, known that the bitmap
* will be drawn in a surface of reqWidth x reqHeight
*
* @param srcPath Absolute path to the file containing the image.
* @param reqWidth Width of the surface where the Bitmap will be drawn on, in pixels.
* @param reqHeight Height of the surface where the Bitmap will be drawn on, in pixels.
* @return
*/
public static Bitmap decodeSampledBitmapFromFile(String srcPath, int reqWidth, int reqHeight) {
// set desired options that will affect the size of the bitmap
final Options options = new Options();
options.inScaled = true;
options.inPurgeable = true;
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.GINGERBREAD_MR1) {
options.inPreferQualityOverSpeed = false;
}
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.HONEYCOMB) {
options.inMutable = false;
}
// make a false load of the bitmap to get its dimensions
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(srcPath, options);
// calculate factor to subsample the bitmap
options.inSampleSize = calculateSampleFactor(options, reqWidth, reqHeight);
// decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
return BitmapFactory.decodeFile(srcPath, options);
}
/**
* @param data 数据或路径
* @param width 目标宽
* @param height 目标高
* @return 图片
*/
private Bitmap createBitmap(Object data, int width, int height) {
Options options = new Options();
int scale = 1;
if (width > 0 && height > 0) { // 创建目标大小的图片
options.inJustDecodeBounds = true;
if (data instanceof String) {
BitmapFactory.decodeFile((String) data, options);
} else {
BitmapFactory.decodeByteArray((byte[]) data, 0, ((byte[]) data).length, options);
}
int dw = options.outWidth / width;
int dh = options.outHeight / height;
scale = Math.max(dw, dh);
options = new Options();
}
options.inDensity = DeviceInfo.getInstance().getDencity();
options.inScaled = true;
options.inPurgeable = true;
options.inSampleSize = scale;
Bitmap bitmap = null;
if (data instanceof String) {
bitmap = BitmapFactory.decodeFile((String) data, options);
} else {
bitmap = BitmapFactory.decodeByteArray((byte[]) data, 0, ((byte[]) data).length, options);
}
return bitmap;
}
/**
* Load a picture from the resource.
*
* @param resources
* @param resourceId
* @return
*/
public static Bitmap loadBitmapFromResource(Resources resources, int resourceId) {
// Not scale the bitmap. This will turn the bitmap in raw pixel unit.
Options options = new BitmapFactory.Options();
options.inScaled = false;
// Load the bitmap object.
Bitmap bitmap = BitmapFactory.decodeResource(resources, resourceId, options);
// Set the density to NONE. This is needed for the ImageView to not scale.
bitmap.setDensity(Bitmap.DENSITY_NONE);
return bitmap;
}
private void copyOptions(Options srcOptions, Options destOptions) {
destOptions.inDensity = srcOptions.inDensity;
destOptions.inDither = srcOptions.inDither;
destOptions.inInputShareable = srcOptions.inInputShareable;
destOptions.inJustDecodeBounds = srcOptions.inJustDecodeBounds;
destOptions.inPreferredConfig = srcOptions.inPreferredConfig;
destOptions.inPurgeable = srcOptions.inPurgeable;
destOptions.inSampleSize = srcOptions.inSampleSize;
destOptions.inScaled = srcOptions.inScaled;
destOptions.inScreenDensity = srcOptions.inScreenDensity;
destOptions.inTargetDensity = srcOptions.inTargetDensity;
destOptions.inTempStorage = srcOptions.inTempStorage;
if (Build.VERSION.SDK_INT >= 10) copyOptions10(srcOptions, destOptions);
if (Build.VERSION.SDK_INT >= 11) copyOptions11(srcOptions, destOptions);
}
public void testActualStegImage() throws DecodingException {
Options opts = new Options();
opts.inScaled = false;
Bitmap bitmap =
BitmapFactory.decodeResource(getContext().getResources(), R.drawable.steg, opts);
PngStegoImage image = new PngStegoImage();
image.setImageBitmap(bitmap);
image.decode();
assertTrue(image.hasEmbeddedData());
}
private TextureReferenceImpl createTextureFromResource(GL10 gl, int resourceID) {
// The texture hasn't been loaded yet, so load it.
TextureReferenceImpl tex = createTextureInternal(gl);
Options opts = new Options();
opts.inScaled = false;
Bitmap bmp = BitmapFactory.decodeResource(mRes, resourceID, opts);
tex.bind(gl);
gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER, GL10.GL_LINEAR);
gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MAG_FILTER, GL10.GL_LINEAR);
gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_S, GL10.GL_CLAMP_TO_EDGE);
gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_T, GL10.GL_CLAMP_TO_EDGE);
GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, bmp, 0);
bmp.recycle();
return tex;
}
