author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 06 Jul 2010 14:10:26 +0300 | |
changeset 48 | e0d6e9bd3ca7 |
parent 21 | 2a9601315dfc |
permissions | -rw-r--r-- |
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Revision: v2.1.22
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package org.eclipse.swt.internal.qt.graphics; |
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/** |
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* Buffer provides a storage for GraphicsContext commands. If GraphicsContext is bound to |
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Revision: v2.1.22
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* Buffer all subsequental draw commands are recorded within the buffer and can be replayed |
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* later by processing it with GraphicsContext.render()-method. |
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* |
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* The main benefit of buffer is the possibility to render to it outside paint callbacks, |
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Revision: v2.1.22
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* i.e. when the actual rendering target cannot be bound. Usage of buffer may also improve |
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* performance. |
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* |
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*/ |
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public final class NativeCommandBuffer { |
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|
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/** |
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* Native peer handle |
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*/ |
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int handle = 0; |
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|
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/** |
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* State of native peer |
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*/ |
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boolean disposed; |
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|
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/** |
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* Constructor |
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* @throws OutOfMemoryError If native buffer creation fails |
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*/ |
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public NativeCommandBuffer() { |
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Utils.validateUiThread(); |
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handle = OS.buffer_init(); |
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if (handle == 0) { |
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throw new OutOfMemoryError("Native buffer creation failed"); |
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} |
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} |
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|
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/** |
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* Disposes this buffer and cleans all related native resources |
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*/ |
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public void dispose() { |
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if (!disposed) { |
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OS.buffer_dispose(handle); |
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handle = 0; |
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disposed = true; |
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} |
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} |
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|
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/** |
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* Gets the rectangle where draw operations have affected, |
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* i.e. the invalid rectangle. |
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* |
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* Values are stored in rect array as follows: |
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* <ul> |
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* <li>rect[0] - the x coordinate of rect</li> |
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* <li>rect[1] - the y coordinate of rect |
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* <li>rect[2] - the width of rect |
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* <li>rect[3] - the height of rect |
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* </ul> |
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* |
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* @param rect Integer array where the rect data is populated, size must be atleast 4 |
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* @throws NullPointerException if rect is null |
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* @throws IllegalArgumentException if rect.length < 4 |
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* @throws IllegalStateException if the buffer has already been disposed |
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*/ |
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public void getInvalidRect(int[] rect) { |
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checkState(); |
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if(rect == null) { |
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throw new NullPointerException("rect is null"); |
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} |
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if(rect.length < 4) { |
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throw new IllegalArgumentException("rect array size is < 4"); |
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} |
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OS.buffer_getInvalidRect(handle, rect); |
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} |
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|
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/** |
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* Gets the state of this Buffer, i.e. is it disposed or not. |
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* |
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* @return true if this instanace has been disposed, otherwise false |
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*/ |
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public boolean isDisposed() { |
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return disposed; |
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} |
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|
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/** |
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* private method for checking the state of this instance. |
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* @throws IllegalStateException If this instance is already disposed |
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*/ |
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private void checkState() { |
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Utils.validateUiThread(); |
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if (disposed) { |
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throw new IllegalStateException("Buffer already disposed"); |
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} |
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} |
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} |