public final class PdfRenderer.Page extends Object implements AutoCloseable
Modifier and Type | Field and Description |
---|---|
static int |
RENDER_MODE_FOR_DISPLAY
Mode to render the content for display on a screen.
|
static int |
RENDER_MODE_FOR_PRINT
Mode to render the content for printing.
|
Modifier and Type | Method and Description |
---|---|
void |
close()
Closes this page.
|
protected void |
finalize()
Called by the garbage collector on an object when garbage collection
determines that there are no more references to the object.
|
int |
getHeight()
Gets the page height in points (1/72").
|
int |
getIndex()
Gets the page index.
|
int |
getWidth()
Gets the page width in points (1/72").
|
void |
render(Bitmap destination,
Rect destClip,
Matrix transform,
int renderMode)
Renders a page to a bitmap.
|
public static final int RENDER_MODE_FOR_DISPLAY
public static final int RENDER_MODE_FOR_PRINT
public int getIndex()
public int getWidth()
public int getHeight()
public void render(Bitmap destination, Rect destClip, Matrix transform, int renderMode)
You may optionally specify a rectangular clip in the bitmap bounds. No rendering outside the clip will be performed, hence it is your responsibility to initialize the bitmap outside the clip.
You may optionally specify a matrix to transform the content from page coordinates which are in points (1/72") to bitmap coordinates which are in pixels. If this matrix is not provided this method will apply a transformation that will fit the whole page to the destination clip if provided or the destination bitmap if no clip is provided.
The clip and transformation are useful for implementing tile rendering where the destination bitmap contains a portion of the image, for example when zooming. Another useful application is for printing where the size of the bitmap holding the page is too large and a client can render the page in stripes.
Note: The destination bitmap format must be
ARGB
.
Note: The optional transformation matrix must be affine as per
Matrix.isAffine()
. Hence, you can specify
rotation, scaling, translation but not a perspective transformation.
destination
- Destination bitmap to which to render.destClip
- Optional clip in the bitmap bounds.transform
- Optional transformation to apply when rendering.renderMode
- The render mode.RENDER_MODE_FOR_DISPLAY
,
RENDER_MODE_FOR_PRINT
public void close()
close
in interface AutoCloseable
PdfRenderer.openPage(int)
protected void finalize() throws Throwable
Object
finalize
method to dispose of
system resources or to perform other cleanup.
The general contract of finalize
is that it is invoked
if and when the JavaTM virtual
machine has determined that there is no longer any
means by which this object can be accessed by any thread that has
not yet died, except as a result of an action taken by the
finalization of some other object or class which is ready to be
finalized. The finalize
method may take any action, including
making this object available again to other threads; the usual purpose
of finalize
, however, is to perform cleanup actions before
the object is irrevocably discarded. For example, the finalize method
for an object that represents an input/output connection might perform
explicit I/O transactions to break the connection before the object is
permanently discarded.
The finalize
method of class Object
performs no
special action; it simply returns normally. Subclasses of
Object
may override this definition.
The Java programming language does not guarantee which thread will
invoke the finalize
method for any given object. It is
guaranteed, however, that the thread that invokes finalize will not
be holding any user-visible synchronization locks when finalize is
invoked. If an uncaught exception is thrown by the finalize method,
the exception is ignored and finalization of that object terminates.
After the finalize
method has been invoked for an object, no
further action is taken until the Java virtual machine has again
determined that there is no longer any means by which this object can
be accessed by any thread that has not yet died, including possible
actions by other objects or classes which are ready to be finalized,
at which point the object may be discarded.
The finalize
method is never invoked more than once by a Java
virtual machine for any given object.
Any exception thrown by the finalize
method causes
the finalization of this object to be halted, but is otherwise
ignored.