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How can I stretch bitmap in WPF without smoothing pixels


How can I stretch bitmap in WPF without smoothing pixels

By : user3851650
Date : October 16 2020, 11:12 AM
I hope this helps you . Finally found an answer, with some help from Experts Exchange. Class RenderOptions defines attached property BitmapScalingMode, which can be set to NearestNeighbor. So,
code :


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Is there a way to convert an existing array of pixels to a BITMAP without copying all the pixels?

Is there a way to convert an existing array of pixels to a BITMAP without copying all the pixels?


By : Pranjali
Date : March 29 2020, 07:55 AM
To fix the issue you can do Yes, you can use the SetDIBitsToDevice() function to copy bits directly to a DC.
Note the restriction about alignment:
looping through bitmap pixels to change color of a bitmap in android

looping through bitmap pixels to change color of a bitmap in android


By : Марк Кисл
Date : March 29 2020, 07:55 AM
it should still fix some issue The reason behind application force close is you are performing CPU intensive operation. your long running operation should be always performed in AsyncTask and not on UI thread of application.
Option 1:
How are the pixels placed in an int[] array of pixels when getting pixels from a Android Bitmap?

How are the pixels placed in an int[] array of pixels when getting pixels from a Android Bitmap?


By : Marko Krstovic
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , The third parameter of getPixels function (int stride), is necessary to say at the function how many pixels there are for each row. So the function know that after X pixels have to skip at new row.
Here you can find the documentation!
Is there a way to not stretch the Bitmap when using Matrix.polyToPoly() on a bitmap?

Is there a way to not stretch the Bitmap when using Matrix.polyToPoly() on a bitmap?


By : Pam
Date : March 29 2020, 07:55 AM
I wish this help you to pskink I got it working, here is a post with the code in it:
OpenCV Utils.matToBitmap: Assertion failed AndroidBitmap_lockPixels(env, bitmap, &pixels) >= 0 if Bitmap is creat

OpenCV Utils.matToBitmap: Assertion failed AndroidBitmap_lockPixels(env, bitmap, &pixels) >= 0 if Bitmap is creat


By : user3227618
Date : March 29 2020, 07:55 AM
This might help you Looking at ImageDecoder official doc, you can read:
code :
fun Uri.getBitmap(resolver: ContentResolver): Bitmap {
  if (Build.VERSION.SDK_INT < Build.VERSION_CODES.P) {
    @Suppress("DEPRECATION")
    return MediaStore.Images.Media.getBitmap(resolver, this)
  } else {
    // https://developer.android.com/reference/android/graphics/ImageDecoder
    // CvException [org.opencv.core.CvException: OpenCV(4.1.1) /build/master_pack-android/opencv/modules/java/generator/src/cpp/utils.cpp:38: error: (-215:Assertion failed) AndroidBitmap_lockPixels(env, bitmap, &pixels) >= 0
    /*
      By default, a Bitmap created by ImageDecoder (including one that is inside a Drawable)
      will be immutable (i.e. Bitmap#isMutable returns false), and it will typically
      have Config Bitmap.Config#HARDWARE. Although these properties can be changed
      with setMutableRequired(true)
     */
    val source = ImageDecoder.createSource(resolver, this)
    return ImageDecoder.decodeBitmap(source) { decoder, _, _ ->
      decoder.isMutableRequired = true
    }
  }
}
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