src/video/mir/SDL_mirmouse.c - third_party/sdl - Git at Google

 /*
   Simple DirectMedia Layer
   Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>

   This software is provided 'as-is', without any express or implied
   warranty.  In no event will the authors be held liable for any damages
   arising from the use of this software.

   Permission is granted to anyone to use this software for any purpose,
   including commercial applications, and to alter it and redistribute it
   freely, subject to the following restrictions:

   1. The origin of this software must not be misrepresented; you must not
      claim that you wrote the original software. If you use this software
      in a product, an acknowledgment in the product documentation would be
      appreciated but is not required.
   2. Altered source versions must be plainly marked as such, and must not be
      misrepresented as being the original software.
   3. This notice may not be removed or altered from any source distribution.
 */

 /*
   Contributed by Brandon Schaefer, <brandon.schaefer@canonical.com>
 */

 #include "../../SDL_internal.h"

 #if SDL_VIDEO_DRIVER_MIR

 #include "../../events/SDL_mouse_c.h"
 #include "../SDL_sysvideo.h"
 #include "SDL_assert.h"

 #include "SDL_mirdyn.h"

 #include "SDL_mirvideo.h"
 #include "SDL_mirmouse.h"
 #include "SDL_mirwindow.h"

 typedef struct
 {
     MirCursorConfiguration* conf;
     MirBufferStream*        stream;
 } MIR_Cursor;

 static SDL_Cursor*
 MIR_CreateDefaultCursor()
 {
     SDL_Cursor* cursor;

     cursor = SDL_calloc(1, sizeof(SDL_Cursor));
     if (cursor) {

         MIR_Cursor* mir_cursor = SDL_calloc(1, sizeof(MIR_Cursor));
         if (mir_cursor) {
             mir_cursor->conf   = NULL;
             mir_cursor->stream = NULL;
             cursor->driverdata = mir_cursor;
         }
         else {
             SDL_OutOfMemory();
             SDL_free(cursor);
             cursor = NULL;
         }
     }
     else {
         SDL_OutOfMemory();
     }

     return cursor;
 }

 static void
 CopySurfacePixelsToMirStream(SDL_Surface* surface, MirBufferStream* stream)
 {
     char* dest, *pixels;
     int i, s_w, s_h, r_stride, p_stride, bytes_per_pixel, bytes_per_row;

     MirGraphicsRegion region;
     MIR_mir_buffer_stream_get_graphics_region(stream, &region);

     s_w = surface->w;
     s_h = surface->h;

     bytes_per_pixel = surface->format->BytesPerPixel;
     bytes_per_row   = bytes_per_pixel * s_w;

     dest = region.vaddr;
     pixels = (char*)surface->pixels;

     r_stride = region.stride;
     p_stride = surface->pitch;

     for (i = 0; i < s_h; i++)
     {
         SDL_memcpy(dest, pixels, bytes_per_row);
         dest   += r_stride;
         pixels += p_stride;
     }
 }

 static SDL_Cursor*
 MIR_CreateCursor(SDL_Surface* surface, int hot_x, int hot_y)
 {
     MirCursorConfiguration* conf;
     MirBufferStream*        stream;

     int s_w = surface->w;
     int s_h = surface->h;

     MIR_Data* mir_data     = (MIR_Data*)SDL_GetVideoDevice()->driverdata;
     SDL_Cursor* cursor     = MIR_CreateDefaultCursor();
     MIR_Cursor* mir_cursor;

     if (!cursor) {
         return NULL;
     }

     mir_cursor = (MIR_Cursor*)cursor->driverdata;

     stream = MIR_mir_connection_create_buffer_stream_sync(mir_data->connection,
                                                           s_w, s_h, mir_data->pixel_format,
                                                           mir_buffer_usage_software);

     conf = MIR_mir_cursor_configuration_from_buffer_stream(stream, hot_x, hot_y);

     CopySurfacePixelsToMirStream(surface, stream);
     MIR_mir_buffer_stream_swap_buffers_sync(stream);

     mir_cursor->conf   = conf;
     mir_cursor->stream = stream;

     return cursor;
 }

 static SDL_Cursor*
 MIR_CreateSystemCursor(SDL_SystemCursor id)
 {
     char const* cursor_name = NULL;
     SDL_Cursor* cursor      = MIR_CreateDefaultCursor();
     MIR_Cursor* mir_cursor  = (MIR_Cursor*)cursor->driverdata;

     if (!cursor) {
         return NULL;
     }

     switch(id) {
         case SDL_SYSTEM_CURSOR_ARROW:
             cursor_name = MIR_mir_arrow_cursor_name;
             break;
         case SDL_SYSTEM_CURSOR_IBEAM:
             cursor_name = MIR_mir_caret_cursor_name;
             break;
         case SDL_SYSTEM_CURSOR_WAIT:
             cursor_name = MIR_mir_busy_cursor_name;
             break;
         case SDL_SYSTEM_CURSOR_CROSSHAIR:
             /* Unsupported */
             cursor_name = MIR_mir_arrow_cursor_name;
             break;
         case SDL_SYSTEM_CURSOR_WAITARROW:
             cursor_name = MIR_mir_busy_cursor_name;
             break;
         case SDL_SYSTEM_CURSOR_SIZENWSE:
             cursor_name = MIR_mir_omnidirectional_resize_cursor_name;
             break;
         case SDL_SYSTEM_CURSOR_SIZENESW:
             cursor_name = MIR_mir_omnidirectional_resize_cursor_name;
             break;
         case SDL_SYSTEM_CURSOR_SIZEWE:
             cursor_name = MIR_mir_horizontal_resize_cursor_name;
             break;
         case SDL_SYSTEM_CURSOR_SIZENS:
             cursor_name = MIR_mir_vertical_resize_cursor_name;
             break;
         case SDL_SYSTEM_CURSOR_SIZEALL:
             cursor_name = MIR_mir_omnidirectional_resize_cursor_name;
             break;
         case SDL_SYSTEM_CURSOR_NO:
             /* Unsupported */
             cursor_name = MIR_mir_closed_hand_cursor_name;
             break;
         case SDL_SYSTEM_CURSOR_HAND:
             cursor_name = MIR_mir_open_hand_cursor_name;
             break;
         default:
             SDL_assert(0);
             return NULL;
     }

     mir_cursor->conf = MIR_mir_cursor_configuration_from_name(cursor_name);

     return cursor;
 }

 static void
 MIR_FreeCursor(SDL_Cursor* cursor)
 {
     if (cursor) {

         if (cursor->driverdata) {
             MIR_Cursor* mir_cursor = (MIR_Cursor*)cursor->driverdata;

             if (mir_cursor->conf)
                 MIR_mir_cursor_configuration_destroy(mir_cursor->conf);
             if (mir_cursor->stream)
                 MIR_mir_buffer_stream_release_sync(mir_cursor->stream);

             SDL_free(mir_cursor);
         }

         SDL_free(cursor);
     }
 }

 static int
 MIR_ShowCursor(SDL_Cursor* cursor)
 {
     MIR_Data* mir_data      = (MIR_Data*)SDL_GetVideoDevice()->driverdata;
     MIR_Window* mir_window  = mir_data->current_window;

     if (cursor && cursor->driverdata) {
         if (mir_window && MIR_mir_surface_is_valid(mir_window->surface)) {
             MIR_Cursor* mir_cursor = (MIR_Cursor*)cursor->driverdata;

             if (mir_cursor->conf) {
                 MIR_mir_surface_configure_cursor(mir_window->surface, mir_cursor->conf);
             }
         }
     }
     else if(mir_window && MIR_mir_surface_is_valid(mir_window->surface)) {
         MIR_mir_surface_configure_cursor(mir_window->surface, NULL);
     }

     return 0;
 }

 static void
 MIR_WarpMouse(SDL_Window* window, int x, int y)
 {
     SDL_Unsupported();
 }

 static int
 MIR_WarpMouseGlobal(int x, int y)
 {
     return SDL_Unsupported();
 }

 static int
 MIR_SetRelativeMouseMode(SDL_bool enabled)
 {
     return 0;
 }

 /* TODO Actually implement the cursor, need to wait for mir support */
 void
 MIR_InitMouse()
 {
     SDL_Mouse* mouse = SDL_GetMouse();

     mouse->CreateCursor         = MIR_CreateCursor;
     mouse->ShowCursor           = MIR_ShowCursor;
     mouse->FreeCursor           = MIR_FreeCursor;
     mouse->WarpMouse            = MIR_WarpMouse;
     mouse->WarpMouseGlobal      = MIR_WarpMouseGlobal;
     mouse->CreateSystemCursor   = MIR_CreateSystemCursor;
     mouse->SetRelativeMouseMode = MIR_SetRelativeMouseMode;

     SDL_SetDefaultCursor(MIR_CreateDefaultCursor());
 }

 void
 MIR_FiniMouse()
 {
     SDL_Mouse* mouse = SDL_GetMouse();

     MIR_FreeCursor(mouse->def_cursor);
     mouse->def_cursor = NULL;

     mouse->CreateCursor         = NULL;
     mouse->ShowCursor           = NULL;
     mouse->FreeCursor           = NULL;
     mouse->WarpMouse            = NULL;
     mouse->CreateSystemCursor   = NULL;
     mouse->SetRelativeMouseMode = NULL;
 }

 #endif /* SDL_VIDEO_DRIVER_MIR */

 /* vi: set ts=4 sw=4 expandtab: */
	/*
	Simple DirectMedia Layer
	Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>

	This software is provided 'as-is', without any express or implied
	warranty. In no event will the authors be held liable for any damages
	arising from the use of this software.

	Permission is granted to anyone to use this software for any purpose,
	including commercial applications, and to alter it and redistribute it
	freely, subject to the following restrictions:

	1. The origin of this software must not be misrepresented; you must not
	claim that you wrote the original software. If you use this software
	in a product, an acknowledgment in the product documentation would be
	appreciated but is not required.
	2. Altered source versions must be plainly marked as such, and must not be
	misrepresented as being the original software.
	3. This notice may not be removed or altered from any source distribution.
	*/

	/*
	Contributed by Brandon Schaefer, <brandon.schaefer@canonical.com>
	*/

	#include "../../SDL_internal.h"

	#if SDL_VIDEO_DRIVER_MIR

	#include "../../events/SDL_mouse_c.h"
	#include "../SDL_sysvideo.h"
	#include "SDL_assert.h"

	#include "SDL_mirdyn.h"

	#include "SDL_mirvideo.h"
	#include "SDL_mirmouse.h"
	#include "SDL_mirwindow.h"

	typedef struct
	{
	MirCursorConfiguration* conf;
	MirBufferStream* stream;
	} MIR_Cursor;

	static SDL_Cursor*
	MIR_CreateDefaultCursor()
	{
	SDL_Cursor* cursor;

	cursor = SDL_calloc(1, sizeof(SDL_Cursor));
	if (cursor) {

	MIR_Cursor* mir_cursor = SDL_calloc(1, sizeof(MIR_Cursor));
	if (mir_cursor) {
	mir_cursor->conf = NULL;
	mir_cursor->stream = NULL;
	cursor->driverdata = mir_cursor;
	}
	else {
	SDL_OutOfMemory();
	SDL_free(cursor);
	cursor = NULL;
	}
	}
	else {
	SDL_OutOfMemory();
	}

	return cursor;
	}

	static void
	CopySurfacePixelsToMirStream(SDL_Surface* surface, MirBufferStream* stream)
	{
	char* dest, *pixels;
	int i, s_w, s_h, r_stride, p_stride, bytes_per_pixel, bytes_per_row;

	MirGraphicsRegion region;
	MIR_mir_buffer_stream_get_graphics_region(stream, &region);

	s_w = surface->w;
	s_h = surface->h;

	bytes_per_pixel = surface->format->BytesPerPixel;
	bytes_per_row = bytes_per_pixel * s_w;

	dest = region.vaddr;
	pixels = (char*)surface->pixels;

	r_stride = region.stride;
	p_stride = surface->pitch;

	for (i = 0; i < s_h; i++)
	{
	SDL_memcpy(dest, pixels, bytes_per_row);
	dest += r_stride;
	pixels += p_stride;
	}
	}

	static SDL_Cursor*
	MIR_CreateCursor(SDL_Surface* surface, int hot_x, int hot_y)
	{
	MirCursorConfiguration* conf;
	MirBufferStream* stream;

	int s_w = surface->w;
	int s_h = surface->h;

	MIR_Data* mir_data = (MIR_Data*)SDL_GetVideoDevice()->driverdata;
	SDL_Cursor* cursor = MIR_CreateDefaultCursor();
	MIR_Cursor* mir_cursor;

	if (!cursor) {
	return NULL;
	}

	mir_cursor = (MIR_Cursor*)cursor->driverdata;

	stream = MIR_mir_connection_create_buffer_stream_sync(mir_data->connection,
	s_w, s_h, mir_data->pixel_format,
	mir_buffer_usage_software);

	conf = MIR_mir_cursor_configuration_from_buffer_stream(stream, hot_x, hot_y);

	CopySurfacePixelsToMirStream(surface, stream);
	MIR_mir_buffer_stream_swap_buffers_sync(stream);

	mir_cursor->conf = conf;
	mir_cursor->stream = stream;

	return cursor;
	}

	static SDL_Cursor*
	MIR_CreateSystemCursor(SDL_SystemCursor id)
	{
	char const* cursor_name = NULL;
	SDL_Cursor* cursor = MIR_CreateDefaultCursor();
	MIR_Cursor* mir_cursor = (MIR_Cursor*)cursor->driverdata;

	if (!cursor) {
	return NULL;
	}

	switch(id) {
	case SDL_SYSTEM_CURSOR_ARROW:
	cursor_name = MIR_mir_arrow_cursor_name;
	break;
	case SDL_SYSTEM_CURSOR_IBEAM:
	cursor_name = MIR_mir_caret_cursor_name;
	break;
	case SDL_SYSTEM_CURSOR_WAIT:
	cursor_name = MIR_mir_busy_cursor_name;
	break;
	case SDL_SYSTEM_CURSOR_CROSSHAIR:
	/* Unsupported */
	cursor_name = MIR_mir_arrow_cursor_name;
	break;
	case SDL_SYSTEM_CURSOR_WAITARROW:
	cursor_name = MIR_mir_busy_cursor_name;
	break;
	case SDL_SYSTEM_CURSOR_SIZENWSE:
	cursor_name = MIR_mir_omnidirectional_resize_cursor_name;
	break;
	case SDL_SYSTEM_CURSOR_SIZENESW:
	cursor_name = MIR_mir_omnidirectional_resize_cursor_name;
	break;
	case SDL_SYSTEM_CURSOR_SIZEWE:
	cursor_name = MIR_mir_horizontal_resize_cursor_name;
	break;
	case SDL_SYSTEM_CURSOR_SIZENS:
	cursor_name = MIR_mir_vertical_resize_cursor_name;
	break;
	case SDL_SYSTEM_CURSOR_SIZEALL:
	cursor_name = MIR_mir_omnidirectional_resize_cursor_name;
	break;
	case SDL_SYSTEM_CURSOR_NO:
	/* Unsupported */
	cursor_name = MIR_mir_closed_hand_cursor_name;
	break;
	case SDL_SYSTEM_CURSOR_HAND:
	cursor_name = MIR_mir_open_hand_cursor_name;
	break;
	default:
	SDL_assert(0);
	return NULL;
	}

	mir_cursor->conf = MIR_mir_cursor_configuration_from_name(cursor_name);

	return cursor;
	}

	static void
	MIR_FreeCursor(SDL_Cursor* cursor)
	{
	if (cursor) {

	if (cursor->driverdata) {
	MIR_Cursor* mir_cursor = (MIR_Cursor*)cursor->driverdata;

	if (mir_cursor->conf)
	MIR_mir_cursor_configuration_destroy(mir_cursor->conf);
	if (mir_cursor->stream)
	MIR_mir_buffer_stream_release_sync(mir_cursor->stream);

	SDL_free(mir_cursor);
	}

	SDL_free(cursor);
	}
	}

	static int
	MIR_ShowCursor(SDL_Cursor* cursor)
	{
	MIR_Data* mir_data = (MIR_Data*)SDL_GetVideoDevice()->driverdata;
	MIR_Window* mir_window = mir_data->current_window;

	if (cursor && cursor->driverdata) {
	if (mir_window && MIR_mir_surface_is_valid(mir_window->surface)) {
	MIR_Cursor* mir_cursor = (MIR_Cursor*)cursor->driverdata;

	if (mir_cursor->conf) {
	MIR_mir_surface_configure_cursor(mir_window->surface, mir_cursor->conf);
	}
	}
	}
	else if(mir_window && MIR_mir_surface_is_valid(mir_window->surface)) {
	MIR_mir_surface_configure_cursor(mir_window->surface, NULL);
	}

	return 0;
	}

	static void
	MIR_WarpMouse(SDL_Window* window, int x, int y)
	{
	SDL_Unsupported();
	}

	static int
	MIR_WarpMouseGlobal(int x, int y)
	{
	return SDL_Unsupported();
	}

	static int
	MIR_SetRelativeMouseMode(SDL_bool enabled)
	{
	return 0;
	}

	/* TODO Actually implement the cursor, need to wait for mir support */
	void
	MIR_InitMouse()
	{
	SDL_Mouse* mouse = SDL_GetMouse();

	mouse->CreateCursor = MIR_CreateCursor;
	mouse->ShowCursor = MIR_ShowCursor;
	mouse->FreeCursor = MIR_FreeCursor;
	mouse->WarpMouse = MIR_WarpMouse;
	mouse->WarpMouseGlobal = MIR_WarpMouseGlobal;
	mouse->CreateSystemCursor = MIR_CreateSystemCursor;
	mouse->SetRelativeMouseMode = MIR_SetRelativeMouseMode;

	SDL_SetDefaultCursor(MIR_CreateDefaultCursor());
	}

	void
	MIR_FiniMouse()
	{
	SDL_Mouse* mouse = SDL_GetMouse();

	MIR_FreeCursor(mouse->def_cursor);
	mouse->def_cursor = NULL;

	mouse->CreateCursor = NULL;
	mouse->ShowCursor = NULL;
	mouse->FreeCursor = NULL;
	mouse->WarpMouse = NULL;
	mouse->CreateSystemCursor = NULL;
	mouse->SetRelativeMouseMode = NULL;
	}

	#endif /* SDL_VIDEO_DRIVER_MIR */

	/* vi: set ts=4 sw=4 expandtab: */