برمجة طبقة فيديو في Raspberry Pi باستخدام DispmanX API

bcm_host_init();
DISPMANX_DISPLAY_HANDLE_T display = vc_dispmanx_display_open( 0 );

VC_IMAGE_TYPE_T type = VC_IMAGE_ARGB8888;
uint32_t UnusedImagePtr;
int SrcImageWidth = 512; //image must be 32 bytes aligned size
int SrcImageWidth = 196;
DISPMANX_RESOURCE_HANDLE_T resource = vc_dispmanx_resource_create( type, SrcImageWidth, SrcImageHeight,  &UnusedImagePtr );

VC_DISPMANX_ALPHA_T alpha;
	alpha.flags =
		(DISPMANX_FLAGS_ALPHA_T)(DISPMANX_FLAGS_ALPHA_FROM_SOURCE | DISPMANX_FLAGS_ALPHA_MIX);
	alpha.opacity = 255;
	alpha.mask = 0;
int OutLayer = 200;
DISPMANX_ELEMENT_HANDLE_T vc_element = vc_dispmanx_element_add(
		update,
		display,
		OutLayer,
		&dst_rect, resource, &src_rect, DISPMANX_PROTECTION_NONE, &alpha, NULL, DISPMANX_NO_ROTATE );

DISPMANX_UPDATE_HANDLE_T update =  vc_dispmanx_update_start( Priority );

vc_dispmanx_update_submit_sync( update );

vc_dispmanx_resource_write_data(
		resource,
		type,
		pitch,
		Pixels, //pointer to ARGB pixels
		&rect );

struct DISPMANX_ELEMENT {
    DISPMANX_RESOURCE_HANDLE_T  res_;
    DISPMANX_ELEMENT_HANDLE_T   vc_element_;
    VC_IMAGE_TYPE_T type_;
    uint32_t src_width_;
    uint32_t src_height_;
    uint32_t dst_layer_;
    uint32_t dst_width_;
    uint32_t dst_height_;
    int32_t  dst_x_;
    int32_t  dst_y_;
};

void dispmanx_init();
void dispmanx_element_init(struct DISPMANX_ELEMENT* Element);
struct DISPMANX_ELEMENT dispmanx_element_create( VC_IMAGE_TYPE_T type, int SrcW, int SrcH, int OutX, int OutY, int OutW, int OutH, int OutLayer );
void dispmanx_element_delete(struct DISPMANX_ELEMENT* Element);
void dispmanx_element_write(struct DISPMANX_ELEMENT* Element, char* Pixels);
void dispmanx_element_move( DISPMANX_UPDATE_HANDLE_T update, struct DISPMANX_ELEMENT* Element, int32_t NewX, int32_t NewY );
DISPMANX_UPDATE_HANDLE_T dispmanx_start_update( int Priority );
void dispmanx_sync( DISPMANX_UPDATE_HANDLE_T Update );

typedef struct OBJ{
	int width_;
	int height_;
	int x_;
	int y_;
	int layer_;
	int speed_;
	char* pixels_;
} OBJ_;

int main(int argc , char *argv[])
{
	cout << "Hello Raspberry DispmanX API!\n";
	dispmanx_init();

	OBJ_ cloud1;
	cloud1.pixels_ = LoadBitmap( (char*)"clouds.bmp", &cloud1.width_, &cloud1.height_ );
	cloud1.layer_ = 100;
	cloud1.x_ = 100;
	cloud1.y_ = 120;
	cloud1.speed_ = 3;

	struct DISPMANX_ELEMENT cloud1_element = dispmanx_element_create(
		VC_IMAGE_ARGB8888, cloud1.width_, cloud1.height_, cloud1.x_, cloud1.y_, cloud1.width_, cloud1.height_, cloud1.layer_ );
	dispmanx_element_write( &cloud1_element, cloud1.pixels_ );

	OBJ_ cloud2;
	cloud2.pixels_ = LoadBitmap( (char*)"clouds.bmp", &cloud2.width_, &cloud2.height_ );
	cloud2.layer_ = 101;
	cloud2.x_ = 10;
	cloud2.y_ = 230;
	cloud2.speed_ = 2;

	struct DISPMANX_ELEMENT cloud2_element = dispmanx_element_create(
		VC_IMAGE_ARGB8888, cloud2.width_, cloud2.height_, cloud2.x_, cloud2.y_, cloud2.width_*1.3, cloud2.height_*1.4, cloud2.layer_ );
	dispmanx_element_write( &cloud2_element, cloud2.pixels_ );

	OBJ_ balls;
	balls.pixels_ = LoadBitmap( (char*)"balls.bmp", &balls.width_, &balls.height_ );
	balls.layer_ = 102;
	balls.x_ = -100;
	balls.y_ = 351;
	balls.speed_ = 5;

	struct DISPMANX_ELEMENT balls_element = dispmanx_element_create(
		VC_IMAGE_ARGB8888, balls.width_, balls.height_, balls.x_, balls.y_, balls.width_, balls.height_, balls.layer_ );
	dispmanx_element_write( &balls_element, balls.pixels_ );

	OBJ_ sun;
	sun.pixels_ = LoadBitmap( (char*)"sun.bmp", &sun.width_, &sun.height_ );
	sun.layer_ = 99;
	sun.x_ = -250;
	sun.y_ = 10;
	sun.speed_ = 1;

	struct DISPMANX_ELEMENT sun_element = dispmanx_element_create(
		VC_IMAGE_ARGB8888, sun.width_, sun.height_, sun.x_, sun.y_, sun.width_, sun.height_, sun.layer_ );
	dispmanx_element_write( &sun_element, sun.pixels_ );
.......................

while(1)
	{
		this_thread::sleep_for( chrono::milliseconds(20) );
		cloud1.x_ += cloud1.speed_;
		if( cloud1.x_>= 1920 )
			cloud1.x_ = 10 - cloud1.width_;

		cloud2.x_ += cloud2.speed_;
		if( cloud2.x_>= 1920 )
			cloud2.x_ = 133 - cloud2.width_;

		balls.x_ += balls.speed_;
		if( balls.x_>= 1920 )
			balls.x_ = 200 - balls.width_;

		sun.x_ += sun.speed_;
		if( sun.x_>= 1920 )
			sun.x_ = 250 - sun.width_;

		DISPMANX_UPDATE_HANDLE_T update = dispmanx_start_update(10);
		dispmanx_element_move( update, &cloud1_element, cloud1.x_, cloud1.y_ );
		dispmanx_element_move( update, &cloud2_element, cloud2.x_, cloud2.y_ );
		dispmanx_element_move( update, &balls_element, balls.x_, balls.y_ );
		dispmanx_element_move( update, &sun_element,   sun.x_,   sun.y_ );
		dispmanx_sync( update );
	}