android/framebuffer.h - fp2-dev/platform/external/qemu - Gitiles

 /* Copyright (C) 2007-2008 The Android Open Source Project
 **
 ** This software is licensed under the terms of the GNU General Public
 ** License version 2, as published by the Free Software Foundation, and
 ** may be copied, distributed, and modified under those terms.
 **
 ** This program is distributed in the hope that it will be useful,
 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 ** GNU General Public License for more details.
 */
 #ifndef _ANDROID_FRAMEBUFFER_H_
 #define _ANDROID_FRAMEBUFFER_H_

 /* A simple abstract interface to framebuffer displays. this is used to
  * de-couple hardware emulation from final display.
  *
  * Each QFrameBuffer object holds a pixel buffer that is shared between
  * one 'Producer' and one or more 'Clients'
  *
  * The Producer is in charge of updating the pixel buffer from the state
  * of the emulated VRAM. A Client listens to updates to the pixel buffer,
  * sent from the producer through qframebuffer_update()/_rotate() and
  * displays them.
  *
  * note the 'rotation' field: it can take values 0, 1, 2 or 3 and corresponds
  * to a rotation that must be performed to the pixels stored in the framebuffer
  * *before* displaying them a value of 1 corresponds to a rotation of
  * 90 clockwise-degrees, when the framebuffer is rotated 90 or 270 degrees,
  * its width/height are swapped automatically
  *
  * phys_width_mm and phys_height_mm are physical dimensions expressed
  * in millimeters
  *
  * More about the client/producer relationships below.
  */
 typedef struct QFrameBuffer   QFrameBuffer;


 typedef enum {
     QFRAME_BUFFER_NONE   = 0,
     QFRAME_BUFFER_RGB565 = 1,
     QFRAME_BUFFER_RGBX_8888 = 2,
     QFRAME_BUFFER_MAX          /* do not remove */
 } QFrameBufferFormat;

 struct QFrameBuffer {
     int                 width;        /* width in pixels */
     int                 height;       /* height in pixels */
     int                 pitch;        /* bytes per line */
     int                 bits_per_pixel; /* bits per pixel */
     int                 bytes_per_pixel;    /* bytes per pixel */
     int                 rotation;     /* rotation to be applied when displaying */
     QFrameBufferFormat  format;
     void*               pixels;       /* pixel buffer */

     int                 phys_width_mm;
     int                 phys_height_mm;

     /* extra data that is handled by the framebuffer implementation */
     void*               extra;

 };

 /* the default dpi resolution of a typical framebuffer. this is an average
  * between various prototypes being used during the development of the
  * Android system...
  */
 #define  DEFAULT_FRAMEBUFFER_DPI   165


 /* initialize a framebuffer object and allocate its pixel buffer */
 /* this computes phys_width_mm and phys_height_mm assuming a 165 dpi screen */
 /* returns -1 in case of error, 0 otherwise */
 extern int
 qframebuffer_init( QFrameBuffer*       qfbuff,
                    int                 width,
                    int                 height,
                    int                 rotation,
                    QFrameBufferFormat  format );

 /* recompute phys_width_mm and phys_height_mm according to the emulated
  * screen DPI settings */
 extern void
 qframebuffer_set_dpi( QFrameBuffer*   qfbuff,
                       int             x_dpi,
                       int             y_dpi );

 /* alternative to qframebuffer_set_dpi where one can set the physical
  * dimensions directly in millimeters. for the record 1 inch = 25.4 mm */
 extern void
 qframebuffer_set_mm( QFrameBuffer*   qfbuff,
                      int             width_mm,
                      int             height_mm );

 /* the Client::Update method is called to instruct a client that a given
  * rectangle of the framebuffer pixels was updated and needs to be
  * redrawn.
  */
 typedef void (*QFrameBufferUpdateFunc)( void*  opaque, int  x, int  y,
                                                        int  w, int  h );

 /* the Client::Rotate method is called to instruct the client that a
  * framebuffer's internal rotation has changed. This is the rotation
  * that must be applied before displaying the pixels.
  *
  * Note that it is assumed that all framebuffer pixels have changed too
  * so the client should call its Update method as well.
  */
 typedef void (*QFrameBufferRotateFunc)( void*  opaque, int  rotation );

 /* the Client::Poll method is called periodically to poll for input
  * events and act on them. Putting this here is not 100% pure but
  * make things simpler due to QEMU's weird architecture where the
  * GUI timer drivers event polling.
  */
 typedef void (*QFrameBufferPollFunc)( void* opaque );

 /* the Client::Done func tells a client that a framebuffer object was freed.
  * no more reference to its pixels should be done.
  */
 typedef void (*QFrameBufferDoneFunc)  ( void*  opaque );

 /* add one client to a given framebuffer.
  * the current implementation only allows one client per frame-buffer,
  * but we could allow more for various reasons (e.g. displaying the
  * framebuffer + dispatching it through VNC at the same time)
  */
 extern void
 qframebuffer_add_client( QFrameBuffer*           qfbuff,
                          void*                   fb_opaque,
                          QFrameBufferUpdateFunc  fb_update,
                          QFrameBufferRotateFunc  fb_rotate,
                          QFrameBufferPollFunc    fb_poll,
                          QFrameBufferDoneFunc    fb_done );

 /* Producer::CheckUpdate is called to let the producer check the
  * VRAM state (e.g. VRAM dirty pages) to see if anything changed since the
  * last call to the method. When true, the method should call either
  * qframebuffer_update() or qframebuffer_rotate() with the appropriate values.
  */
 typedef void (*QFrameBufferCheckUpdateFunc)( void*  opaque );

 /* Producer::Invalidate tells the producer that the next call to
  * CheckUpdate should act as if the whole content of VRAM had changed.
  * this is normally done to force client initialization/refreshes.
  */
 typedef void (*QFrameBufferInvalidateFunc) ( void*  opaque );

 /* the Producer::Detach method is used to tell the producer that the
  * underlying QFrameBuffer object is about to be de-allocated.
  */
 typedef void (*QFrameBufferDetachFunc)     ( void*  opaque );

 /* set the producer of a given framebuffer */
 extern void
 qframebuffer_set_producer( QFrameBuffer*                qfbuff,
                            void*                        opaque,
                            QFrameBufferCheckUpdateFunc  fb_check,
                            QFrameBufferInvalidateFunc   fb_invalidate,
                            QFrameBufferDetachFunc       fb_detach );

 /* tell a client that a rectangle region has been updated in the framebuffer
  * pixel buffer this is typically called from a Producer::CheckUpdate method
  */
 extern void
 qframebuffer_update( QFrameBuffer*  qfbuff, int  x, int  y, int  w, int  h );

 /* rotate the framebuffer (may swap width/height), and tell all clients.
  * Should be called from a Producer::CheckUpdate method
  */
 extern void
 qframebuffer_rotate( QFrameBuffer*  qfbuff, int  rotation );

 /* this function is used to poll a framebuffer's client for input
  * events. Should be called either explicitely, or through qframebuffer_pulse()
  * periodically.
  */
 extern void
 qframebuffer_poll( QFrameBuffer* qfbuff );

 /* finalize a framebuffer, release its pixel buffer. Should be called
  * from the framebuffer object's owner
  */
 extern void
 qframebuffer_done( QFrameBuffer*   qfbuff );


 /* this is called repeatedly by the emulator. for each registered framebuffer,
  * call its producer's CheckUpdate method, if any.
  */
 extern void
 qframebuffer_check_updates( void );

 /* call this function periodically to force a poll on all franebuffers
  */
 extern void
 qframebuffer_pulse( void );

 /* this is called by the emulator. for each registered framebuffer, call
  * its producer's Invalidate method, if any
  */
 extern void
 qframebuffer_invalidate_all( void );

 /*
  * to completely separate the implementation of clients, producers, and skins,
  * we use a simple global FIFO list of QFrameBuffer objects.
  *
  * qframebuffer_fifo_add() is typically called by the emulator initialization
  * depending on the emulated device's configuration
  *
  * qframebuffer_fifo_get() is typically called by a hardware framebuffer
  * emulation.
  */

 /* add a new constructed frame buffer object to our global list */
 extern void
 qframebuffer_fifo_add( QFrameBuffer*  qfbuff );

 /* retrieve a frame buffer object from the global FIFO list */
 extern QFrameBuffer*
 qframebuffer_fifo_get( void );

 /* */

 #endif /* _ANDROID_FRAMEBUFFER_H_ */
	/* Copyright (C) 2007-2008 The Android Open Source Project
	**
	** This software is licensed under the terms of the GNU General Public
	** License version 2, as published by the Free Software Foundation, and
	** may be copied, distributed, and modified under those terms.
	**
	** This program is distributed in the hope that it will be useful,
	** but WITHOUT ANY WARRANTY; without even the implied warranty of
	** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	** GNU General Public License for more details.
	*/
	#ifndef _ANDROID_FRAMEBUFFER_H_
	#define _ANDROID_FRAMEBUFFER_H_

	/* A simple abstract interface to framebuffer displays. this is used to
	* de-couple hardware emulation from final display.
	*
	* Each QFrameBuffer object holds a pixel buffer that is shared between
	* one 'Producer' and one or more 'Clients'
	*
	* The Producer is in charge of updating the pixel buffer from the state
	* of the emulated VRAM. A Client listens to updates to the pixel buffer,
	* sent from the producer through qframebuffer_update()/_rotate() and
	* displays them.
	*
	* note the 'rotation' field: it can take values 0, 1, 2 or 3 and corresponds
	* to a rotation that must be performed to the pixels stored in the framebuffer
	* before displaying them a value of 1 corresponds to a rotation of
	* 90 clockwise-degrees, when the framebuffer is rotated 90 or 270 degrees,
	* its width/height are swapped automatically
	*
	* phys_width_mm and phys_height_mm are physical dimensions expressed
	* in millimeters
	*
	* More about the client/producer relationships below.
	*/
	typedef struct QFrameBuffer QFrameBuffer;


	typedef enum {
	QFRAME_BUFFER_NONE = 0,
	QFRAME_BUFFER_RGB565 = 1,
	QFRAME_BUFFER_RGBX_8888 = 2,
	QFRAME_BUFFER_MAX /* do not remove */
	} QFrameBufferFormat;

	struct QFrameBuffer {
	int width; /* width in pixels */
	int height; /* height in pixels */
	int pitch; /* bytes per line */
	int bits_per_pixel; /* bits per pixel */
	int bytes_per_pixel; /* bytes per pixel */
	int rotation; /* rotation to be applied when displaying */
	QFrameBufferFormat format;
	void* pixels; /* pixel buffer */

	int phys_width_mm;
	int phys_height_mm;

	/* extra data that is handled by the framebuffer implementation */
	void* extra;

	};

	/* the default dpi resolution of a typical framebuffer. this is an average
	* between various prototypes being used during the development of the
	* Android system...
	*/
	#define DEFAULT_FRAMEBUFFER_DPI 165


	/* initialize a framebuffer object and allocate its pixel buffer */
	/* this computes phys_width_mm and phys_height_mm assuming a 165 dpi screen */
	/* returns -1 in case of error, 0 otherwise */
	extern int
	qframebuffer_init( QFrameBuffer* qfbuff,
	int width,
	int height,
	int rotation,
	QFrameBufferFormat format );

	/* recompute phys_width_mm and phys_height_mm according to the emulated
	* screen DPI settings */
	extern void
	qframebuffer_set_dpi( QFrameBuffer* qfbuff,
	int x_dpi,
	int y_dpi );

	/* alternative to qframebuffer_set_dpi where one can set the physical
	* dimensions directly in millimeters. for the record 1 inch = 25.4 mm */
	extern void
	qframebuffer_set_mm( QFrameBuffer* qfbuff,
	int width_mm,
	int height_mm );

	/* the Client::Update method is called to instruct a client that a given
	* rectangle of the framebuffer pixels was updated and needs to be
	* redrawn.
	*/
	typedef void (QFrameBufferUpdateFunc)( void opaque, int x, int y,
	int w, int h );

	/* the Client::Rotate method is called to instruct the client that a
	* framebuffer's internal rotation has changed. This is the rotation
	* that must be applied before displaying the pixels.
	*
	* Note that it is assumed that all framebuffer pixels have changed too
	* so the client should call its Update method as well.
	*/
	typedef void (QFrameBufferRotateFunc)( void opaque, int rotation );

	/* the Client::Poll method is called periodically to poll for input
	* events and act on them. Putting this here is not 100% pure but
	* make things simpler due to QEMU's weird architecture where the
	* GUI timer drivers event polling.
	*/
	typedef void (QFrameBufferPollFunc)( void opaque );

	/* the Client::Done func tells a client that a framebuffer object was freed.
	* no more reference to its pixels should be done.
	*/
	typedef void (QFrameBufferDoneFunc) ( void opaque );

	/* add one client to a given framebuffer.
	* the current implementation only allows one client per frame-buffer,
	* but we could allow more for various reasons (e.g. displaying the
	* framebuffer + dispatching it through VNC at the same time)
	*/
	extern void
	qframebuffer_add_client( QFrameBuffer* qfbuff,
	void* fb_opaque,
	QFrameBufferUpdateFunc fb_update,
	QFrameBufferRotateFunc fb_rotate,
	QFrameBufferPollFunc fb_poll,
	QFrameBufferDoneFunc fb_done );

	/* Producer::CheckUpdate is called to let the producer check the
	* VRAM state (e.g. VRAM dirty pages) to see if anything changed since the
	* last call to the method. When true, the method should call either
	* qframebuffer_update() or qframebuffer_rotate() with the appropriate values.
	*/
	typedef void (QFrameBufferCheckUpdateFunc)( void opaque );

	/* Producer::Invalidate tells the producer that the next call to
	* CheckUpdate should act as if the whole content of VRAM had changed.
	* this is normally done to force client initialization/refreshes.
	*/
	typedef void (QFrameBufferInvalidateFunc) ( void opaque );

	/* the Producer::Detach method is used to tell the producer that the
	* underlying QFrameBuffer object is about to be de-allocated.
	*/
	typedef void (QFrameBufferDetachFunc) ( void opaque );

	/* set the producer of a given framebuffer */
	extern void
	qframebuffer_set_producer( QFrameBuffer* qfbuff,
	void* opaque,
	QFrameBufferCheckUpdateFunc fb_check,
	QFrameBufferInvalidateFunc fb_invalidate,
	QFrameBufferDetachFunc fb_detach );

	/* tell a client that a rectangle region has been updated in the framebuffer
	* pixel buffer this is typically called from a Producer::CheckUpdate method
	*/
	extern void
	qframebuffer_update( QFrameBuffer* qfbuff, int x, int y, int w, int h );

	/* rotate the framebuffer (may swap width/height), and tell all clients.
	* Should be called from a Producer::CheckUpdate method
	*/
	extern void
	qframebuffer_rotate( QFrameBuffer* qfbuff, int rotation );

	/* this function is used to poll a framebuffer's client for input
	* events. Should be called either explicitely, or through qframebuffer_pulse()
	* periodically.
	*/
	extern void
	qframebuffer_poll( QFrameBuffer* qfbuff );

	/* finalize a framebuffer, release its pixel buffer. Should be called
	* from the framebuffer object's owner
	*/
	extern void
	qframebuffer_done( QFrameBuffer* qfbuff );


	/* this is called repeatedly by the emulator. for each registered framebuffer,
	* call its producer's CheckUpdate method, if any.
	*/
	extern void
	qframebuffer_check_updates( void );

	/* call this function periodically to force a poll on all franebuffers
	*/
	extern void
	qframebuffer_pulse( void );

	/* this is called by the emulator. for each registered framebuffer, call
	* its producer's Invalidate method, if any
	*/
	extern void
	qframebuffer_invalidate_all( void );

	/*
	* to completely separate the implementation of clients, producers, and skins,
	* we use a simple global FIFO list of QFrameBuffer objects.
	*
	* qframebuffer_fifo_add() is typically called by the emulator initialization
	* depending on the emulated device's configuration
	*
	* qframebuffer_fifo_get() is typically called by a hardware framebuffer
	* emulation.
	*/

	/* add a new constructed frame buffer object to our global list */
	extern void
	qframebuffer_fifo_add( QFrameBuffer* qfbuff );

	/* retrieve a frame buffer object from the global FIFO list */
	extern QFrameBuffer*
	qframebuffer_fifo_get( void );

	/* */

	#endif /* _ANDROID_FRAMEBUFFER_H_ */