/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997-2004 Sam Lantinga
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Sam Lantinga
slouken@libsdl.org
*/
#include "SDL_config.h"
/*
File added by Alan Buckley (alan_baa@hotmail.com) for RISC OS compatability
27 March 2003
Implements mouse cursor shape definitions and positioning
*/
#include "SDL_mouse.h"
#include "../../events/SDL_events_c.h"
#include "SDL_riscosmouse_c.h"
#include "kernel.h"
#include "swis.h"
static WMcursor *current_cursor = NULL;
static WMcursor *defined_cursor = NULL;
extern int mouseInWindow;
/* Area to save cursor palette colours changed by SDL.
Actual values will be read before we change to the SDL cursor */
static Uint8 wimp_cursor_palette[2][5] = {
{1, 25, 255, 255, 255},
{3, 25, 255, 255, 255}
};
static int cursor_palette_saved = 0;
void WIMP_SaveCursorPalette();
void WIMP_RestoreWimpCursor();
void WIMP_SetSDLCursorPalette();
void RISCOS_FreeWMCursor(_THIS, WMcursor *cursor)
{
SDL_free(cursor->data);
SDL_free(cursor);
}
WMcursor *RISCOS_CreateWMCursor(_THIS,
Uint8 *data, Uint8 *mask, int w, int h, int hot_x, int hot_y)
{
WMcursor *cursor;
Uint8 *cursor_data;
Uint8 *ptr;
int i,j,k;
int data_byte, mask_byte;
/* Check to make sure the cursor size is okay */
if ( (w > 32) || (h > 32) ) {
SDL_SetError("Only with width and height <= 32 pixels are allowed");
return(NULL);
}
/* Allocate the cursor */
cursor = (WMcursor *)SDL_malloc(sizeof(*cursor));
if ( cursor == NULL ) {
SDL_SetError("Out of memory");
return(NULL);
}
/* Note: SDL says width must be a multiple of 8 */
cursor_data = SDL_malloc(w/4 * h);
if (cursor_data == NULL)
{
SDL_free(cursor);
SDL_SetError("Out of memory");
return(NULL);
}
cursor->w = w;
cursor->h = h;
cursor->hot_x = hot_x;
cursor->hot_y = hot_y;
cursor->data = cursor_data;
/* Data / Mask Resulting pixel on screen
0 / 1 White
1 / 1 Black
0 / 0 Transparent
1 / 0 Inverted color if possible, black if not.
*/
ptr = cursor_data;
for ( i=0; i<h; ++i )
{
for (j = 0; j < w/8; ++j)
{
data_byte = *data;
mask_byte = *mask;
*ptr++ = 0; /* Sets whole byte transparent */
*ptr = 0;
for (k = 0; k < 8; k++)
{
(*ptr) <<= 2;
if (data_byte & 1) *ptr |= 3; /* Black or inverted */
else if(mask_byte & 1) *ptr |= 1; /* White */
if ((k&3) == 3) ptr--;
data_byte >>= 1;
mask_byte >>= 1;
}
ptr+=3;
data++;
mask++;
}
}
return(cursor);
}
int RISCOS_ShowWMCursor(_THIS, WMcursor *cursor)
{
current_cursor = cursor;
if (cursor == NULL)
{
_kernel_osbyte(106,0,0);
defined_cursor = NULL;
} else
{
WMcursor *old_cursor = defined_cursor;
if (cursor != defined_cursor)
{
Uint8 cursor_def[10];
cursor_def[0] = 0;
cursor_def[1] = 2; /* Use shape number 2 */
cursor_def[2] = cursor->w/4; /* Width in bytes */
cursor_def[3] = cursor->h; /* Height (h) in pixels */
cursor_def[4] = cursor->hot_x; /* ActiveX in pixels from left */
cursor_def[5] = cursor->hot_y; /* ActiveY in pixels from top */
cursor_def[6] = ((int)(cursor->data) & 0xFF); /* Least significant byte of pointer to data */
cursor_def[7] = ((int)(cursor->data) >> 8) & 0xFF; /* ... */
cursor_def[8] = ((int)(cursor->data) >> 16) & 0xFF; /* ... */
cursor_def[9] = ((int)(cursor->data) >> 24) & 0xFF; /* Most significant byte of pointer to data */
if (_kernel_osword(21, (int *)cursor_def) != 0)
{
SDL_SetError("RISCOS couldn't create the cursor to show");
return(0);
}
defined_cursor = cursor;
}
if (old_cursor == NULL)
{
/* First time or reshow in window, so save/setup palette */
if (!cursor_palette_saved)
{
WIMP_SaveCursorPalette();
}
WIMP_SetSDLCursorPalette();
}
_kernel_osbyte(106, 2, 0);
}
return(1);
}
void FULLSCREEN_WarpWMCursor(_THIS, Uint16 x, Uint16 y)
{
Uint8 move_block[5];
int eig_block[3];
_kernel_swi_regs regs;
int os_x, os_y;
eig_block[0] = 4; /* X eig factor */
eig_block[1] = 5; /* Y eig factor */
eig_block[2] = -1; /* End of list of variables to request */
regs.r[0] = (int)eig_block;
regs.r[1] = (int)eig_block;
_kernel_swi(OS_ReadVduVariables, ®s, ®s);
os_x = x << eig_block[0];
os_y = y << eig_block[1];
move_block[0] = 3; /* Move cursor */
move_block[1] = os_x & 0xFF;
move_block[2] = (os_x >> 8) & 0xFF;
move_block[3] = os_y & 0xFF;
move_block[4] = (os_y >> 8) & 0xFF;
_kernel_osword(21, (int *)move_block);
SDL_PrivateMouseMotion(0, 0, x, y);
}
/* Reshow cursor when mouse re-enters the window */
void WIMP_ReshowCursor(_THIS)
{
defined_cursor = NULL;
cursor_palette_saved = 0;
RISCOS_ShowWMCursor(this, current_cursor);
}
void WIMP_WarpWMCursor(_THIS, Uint16 x, Uint16 y)
{
_kernel_swi_regs regs;
int window_state[9];
char block[5];
int osX, osY;
window_state[0] = this->hidden->window_handle;
regs.r[1] = (unsigned int)window_state;
_kernel_swi(Wimp_GetWindowState, ®s, ®s);
osX = (x << this->hidden->xeig) + window_state[1];
osY = window_state[4] - (y << this->hidden->yeig);
block[0] = 3;
block[1] = osX & 0xFF;
block[2] = (osX >> 8) & 0xFF;
block[3] = osY & 0xFF;
block[4] = (osY >> 8) & 0xFF;
regs.r[0] = 21;
regs.r[1] = (int)block;
_kernel_swi(OS_Word, ®s, ®s);
SDL_PrivateMouseMotion(0, 0, x, y);
}
int WIMP_ShowWMCursor(_THIS, WMcursor *cursor)
{
if (mouseInWindow) return RISCOS_ShowWMCursor(this, cursor);
else current_cursor = cursor;
return 1;
}
SDL_GrabMode RISCOS_GrabInput(_THIS, SDL_GrabMode mode)
{
/* In fullscreen mode we don't need to do anything */
if (mode < SDL_GRAB_FULLSCREEN)
{
_kernel_swi_regs regs;
unsigned char block[9];
block[0] = 1; /* Define mouse cursor bounding block */
if ( mode == SDL_GRAB_OFF )
{
/* Clip to whole screen */
int r = (this->hidden->screen_width << this->hidden->xeig) - 1;
int t = (this->hidden->screen_height << this->hidden->yeig) - 1;
block[1] = 0; block[2] = 0; /* Left*/
block[3] = 0; block[4] = 0; /* Bottom */
block[5] = r & 0xFF; block[6] = (r >> 8) & 0xFF; /* Right */
block[7] = t & 0xFF; block[8] = (t >> 8) & 0xFF; /* Top */
} else
{
/* Clip to window */
unsigned char window_state[36];
*((int *)window_state) = this->hidden->window_handle;
regs.r[1] = (unsigned int)window_state;
_kernel_swi(Wimp_GetWindowState, ®s, ®s);
block[1] = window_state[4];
block[2] = window_state[5];
block[3] = window_state[8];
block[4] = window_state[9];
block[5] = window_state[12];
block[6] = window_state[13];
block[7] = window_state[16];
block[8] = window_state[17];
}
regs.r[0] = 21; /* OS word code */
regs.r[1] = (int)block;
_kernel_swi(OS_Word, ®s, ®s);
}
return mode;
}
/* Save mouse cursor palette to be restore when we are no longer
defining a cursor */
void WIMP_SaveCursorPalette()
{
_kernel_swi_regs regs;
int colour;
for (colour = 0; colour < 2; colour++)
{
regs.r[0] = (int)wimp_cursor_palette[colour][0];
regs.r[1] = 25;
/* Read settings with OS_ReadPalette */
if (_kernel_swi(0x2f, ®s, ®s) == NULL)
{
wimp_cursor_palette[colour][2] = (unsigned char)((regs.r[2] >> 8) & 0xFF);
wimp_cursor_palette[colour][3] = (unsigned char)((regs.r[2] >> 16) & 0xFF);
wimp_cursor_palette[colour][4] = (unsigned char)((regs.r[2] >> 24) & 0xFF);
}
}
cursor_palette_saved = 1;
}
/* Restore the WIMP's cursor when we leave the SDL window */
void WIMP_RestoreWimpCursor()
{
int colour;
/* Reset to pointer shape 1 */
_kernel_osbyte(106, 1, 0);
/* Reset pointer colours */
if (cursor_palette_saved)
{
for (colour = 0; colour < 2; colour++)
{
_kernel_osword(12, (int *)wimp_cursor_palette[colour]);
}
}
cursor_palette_saved = 0;
}
/* Set palette used for SDL mouse cursors */
void WIMP_SetSDLCursorPalette()
{
/* First time set up the mouse colours */
Uint8 block[5];
/* Set up colour 1 as white */
block[0] = 1; /* Colour to change 1 - 3 */
block[1] = 25; /* Set pointer colour */
block[2] = 255; /* red component*/
block[3] = 255; /* green component */
block[4] = 255; /* blue component*/
_kernel_osword(12, (int *)block);
/* Set colour 3 to back */
block[0] = 3; /* Colour to change 1 - 3 */
block[1] = 25; /* Set pointer colour*/
block[2] = 0; /* red component*/
block[3] = 0; /* green component */
block[4] = 0; /* blue component*/
_kernel_osword(12, (int *)block);
}