I'm working on an app that requires the user to be able to read some text that's in the camera's preview images. The camera has plenty of resolution for the range I'm looking at, but when it's shrunk down to fit on the phone's display it's completely unusable. What I want to do is just display a subset of the preview images, but display them at the native resolution of the image, rather than the scaled down image. I tried Camera.Parameters.setPreviewSize, but it seems to have no effect (giving it (1, 1) is the same as giving it (1000000, 1000000), which is the same as some rational value). I also tried capturing the image using Camera.PreviewCallback.onPreviewFrame andconverting it to a bitmap then using a canvas from a SurfaceView to display a portion of the bitmap, but the SDK has no way to convert from the camera's format to bitmap, and it seems that doing such things in the preview callback is unworkably expensive. How should I draw a subpicture at native resolution rather than the entire image scaled to fit the phone's screen?
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