--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/events/SDL_touch.c	Tue May 25 23:23:23 2010 -0400
@@ -0,0 +1,575 @@
+/*
+    SDL - Simple DirectMedia Layer
+    Copyright (C) 1997-2010 Sam Lantinga
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2.1 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
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+    Sam Lantinga
+    slouken@libsdl.org
+*/
+#include "SDL_config.h"
+
+/* General touch handling code for SDL */
+
+#include "SDL_events.h"
+#include "SDL_events_c.h"
+#include "../video/SDL_sysvideo.h"
+
+
+static int SDL_num_touch = 0;
+static int SDL_current_touch = -1;
+static SDL_Touch **SDL_touch = NULL;
+
+
+/* Public functions */
+int
+SDL_TouchInit(void)
+{
+    return (0);
+}
+
+SDL_Touch *
+SDL_GetTouch(int index)
+{
+    if (index < 0 || index >= SDL_num_touch) {
+        return NULL;
+    }
+    return SDL_touch[index];
+}
+
+static int
+SDL_GetTouchIndexId(int id)
+{
+    int index;
+    SDL_Touch *touch;
+
+    for (index = 0; index < SDL_num_touch; ++index) {
+        touch = SDL_GetTouch(index);
+        if (touch->id == id) {
+            return index;
+        }
+    }
+    return -1;
+}
+
+int
+SDL_AddTouch(const SDL_Touch * touch, char *name, int pressure_max,
+             int pressure_min, int ends)
+{
+    SDL_Touch **touch;
+    int selected_touch;
+    int index;
+    size_t length;
+
+    if (SDL_GetTouchIndexId(touch->id) != -1) {
+        SDL_SetError("Touch ID already in use");
+    }
+
+    /* Add the touch to the list of touch */
+    touch = (SDL_Touch **) SDL_realloc(SDL_touch,
+                                      (SDL_num_touch + 1) * sizeof(*touch));
+    if (!touch) {
+        SDL_OutOfMemory();
+        return -1;
+    }
+
+    SDL_touch = touch;
+    index = SDL_num_touch++;
+
+    SDL_touch[index] = (SDL_Touch *) SDL_malloc(sizeof(*SDL_touch[index]));
+    if (!SDL_touch[index]) {
+        SDL_OutOfMemory();
+        return -1;
+    }
+    *SDL_touch[index] = *touch;
+
+    /* we're setting the touch properties */
+    length = 0;
+    length = SDL_strlen(name);
+    SDL_touch[index]->focus = 0;
+    SDL_touch[index]->name = SDL_malloc((length + 2) * sizeof(char));
+    SDL_strlcpy(SDL_touch[index]->name, name, length + 1);
+    SDL_touch[index]->pressure_max = pressure_max;
+    SDL_touch[index]->pressure_min = pressure_min;
+    SDL_touch[index]->cursor_shown = SDL_TRUE;
+    selected_touch = SDL_SelectTouch(index);
+    SDL_touch[index]->cur_cursor = NULL;
+    SDL_touch[index]->def_cursor =
+    /* we're assuming that all touch are in the computer sensing zone */
+    SDL_touch[index]->proximity = SDL_TRUE;
+    /* we're assuming that all touch are working in the absolute position mode
+       thanx to that, the users that don't want to use many touch don't have to
+       worry about anything */
+    SDL_touch[index]->relative_mode = SDL_FALSE;
+    SDL_touch[index]->current_end = 0;
+    SDL_touch[index]->total_ends = ends;
+    SDL_SelectTouch(selected_touch);
+
+    return index;
+}
+
+void
+SDL_DelTouch(int index)
+{
+    SDL_Touch *touch = SDL_GetTouch(index);
+
+    if (!touch) {
+        return;
+    }
+
+    touch->def_cursor = NULL;
+    SDL_free(touch->name);
+ 
+    if (touch->FreeTouch) {
+        touch->FreeTouch(touch);
+    }
+    SDL_free(touch);
+
+    SDL_touch[index] = NULL;
+}
+
+void
+SDL_ResetTouch(int index)
+{
+    SDL_Touch *touch = SDL_GetTouch(index);
+
+    if (!touch) {
+        return;
+    }
+
+    /* FIXME */
+}
+
+void
+SDL_TouchQuit(void)
+{
+    int i;
+
+    for (i = 0; i < SDL_num_touch; ++i) {
+        SDL_DelTouch(i);
+    }
+    SDL_num_touch = 0;
+    SDL_current_touch = -1;
+
+    if (SDL_touch) {
+        SDL_free(SDL_touch);
+        SDL_touch = NULL;
+    }
+}
+
+int
+SDL_GetNumTouch(void)
+{
+    return SDL_num_touch;
+}
+
+int
+SDL_SelectTouch(int index)
+{
+    if (index >= 0 && index < SDL_num_touch) {
+        SDL_current_touch = index;
+    }
+    return SDL_current_touch;
+}
+
+SDL_Window *
+SDL_GetTouchFocusWindow(int index)
+{
+    SDL_Touch *touch = SDL_GetTouch(index);
+
+    if (!touch) {
+        return 0;
+    }
+    return touch->focus;
+}
+
+static int SDLCALL
+FlushTouchMotion(void *param, SDL_Event * event)
+{
+    if (event->type == SDL_TOUCHMOTION
+        && event->motion.which == (Uint8) SDL_current_touch) {
+        return 0;
+    } else {
+        return 1;
+    }
+}
+
+int
+SDL_SetRelativeTouchMode(int index, SDL_bool enabled)
+{
+    SDL_Touch *touch = SDL_GetTouch(index);
+
+    if (!touch) {
+        return -1;
+    }
+
+    /* Flush pending touch motion */
+    touch->flush_motion = SDL_TRUE;
+    SDL_PumpEvents();
+    touch->flush_motion = SDL_FALSE;
+    SDL_FilterEvents(FlushTouchMotion, touch);
+
+    /* Set the relative mode */
+    touch->relative_mode = enabled;
+
+
+
+    if (!enabled) {
+        /* Restore the expected touch position */
+        SDL_WarpTouchInWindow(touch->focus, touch->x, touch->y);
+    }
+    return 0;
+}
+
+SDL_bool
+SDL_GetRelativeTouchMode(int index)
+{
+    SDL_Touch *touch = SDL_GetTouch(index);
+
+    if (!touch) {
+        return SDL_FALSE;
+    }
+    return touch->relative_mode;
+}
+
+Uint8
+SDL_GetTouchState(int *x, int *y)
+{
+    SDL_Touch *touch = SDL_GetTouch(SDL_current_touch);
+
+    if (!touch) {
+        if (x) {
+            *x = 0;
+        }
+        if (y) {
+            *y = 0;
+        }
+        return 0;
+    }
+
+    if (x) {
+        *x = touch->x;
+    }
+    if (y) {
+        *y = touch->y;
+    }
+    return touch->buttonstate;
+}
+
+Uint8
+SDL_GetRelativeTouchState(int index, int *x, int *y)
+{
+    SDL_Touch *touch = SDL_GetTouch(index);
+
+    if (!touch) {
+        if (x) {
+            *x = 0;
+        }
+        if (y) {
+            *y = 0;
+        }
+        return 0;
+    }
+
+    if (x) {
+        *x = touch->xdelta;
+    }
+    if (y) {
+        *y = touch->ydelta;
+    }
+    touch->xdelta = 0;
+    touch->ydelta = 0;
+    return touch->buttonstate;
+}
+
+void
+SDL_SetTouchFocus(int id, SDL_Window * window)
+{
+    int index = SDL_GetTouchIndexId(id);
+    SDL_Touch *touch = SDL_GetTouch(index);
+    int i;
+    SDL_bool focus;
+
+    if (!touch || (touch->focus == window)) {
+        return;
+    }
+
+    /* See if the current window has lost focus */
+    if (touch->focus) {
+        focus = SDL_FALSE;
+        for (i = 0; i < SDL_num_touch; ++i) {
+            SDL_Touch *check;
+            if (i != index) {
+                check = SDL_GetTouch(i);
+                if (check && check->focus == touch->focus) {
+                    focus = SDL_TRUE;
+                    break;
+                }
+            }
+        }
+        if (!focus) {
+            SDL_SendWindowEvent(touch->focus, SDL_WINDOWEVENT_LEAVE, 0, 0);
+        }
+    }
+
+    touch->focus = window;
+
+    if (touch->focus) {
+        focus = SDL_FALSE;
+        for (i = 0; i < SDL_num_touch; ++i) {
+            SDL_Touch *check;
+            if (i != index) {
+                check = SDL_GetTouch(i);
+                if (check && check->focus == touch->focus) {
+                    focus = SDL_TRUE;
+                    break;
+                }
+            }
+        }
+        if (!focus) {
+            SDL_SendWindowEvent(touch->focus, SDL_WINDOWEVENT_ENTER, 0, 0);
+        }
+    }
+}
+
+int
+SDL_SendProximity(int id, int x, int y, int type)
+{
+    int index = SDL_GetTouchIndexId(id);
+    SDL_Touch *touch = SDL_GetTouch(index);
+    int posted = 0;
+
+    if (!touch) {
+        return 0;
+    }
+
+    touch->last_x = x;
+    touch->last_y = y;
+    if (SDL_GetEventState(type) == SDL_ENABLE) {
+        SDL_Event event;
+        event.proximity.which = (Uint8) index;
+        event.proximity.x = x;
+        event.proximity.y = y;
+        event.proximity.cursor = touch->current_end;
+        event.proximity.type = type;
+        /* FIXME: is this right? */
+        event.proximity.windowID = touch->focus ? touch->focus->id : 0;
+        posted = (SDL_PushEvent(&event) > 0);
+        if (type == SDL_PROXIMITYIN) {
+            touch->proximity = SDL_TRUE;
+        } else {
+            touch->proximity = SDL_FALSE;
+        }
+    }
+    return posted;
+}
+
+int
+SDL_SendTouchMotion(int id, int relative, int x, int y, int pressure)
+{
+    int index = SDL_GetTouchIndexId(id);
+    SDL_Touch *touch = SDL_GetTouch(index);
+    int posted;
+    int xrel;
+    int yrel;
+    int x_max = 0, y_max = 0;
+
+    if (!touch || touch->flush_motion) {
+        return 0;
+    }
+
+    /* if the touch is out of proximity we don't to want to have any motion from it */
+    if (touch->proximity == SDL_FALSE) {
+        touch->last_x = x;
+        touch->last_y = y;
+        return 0;
+    }
+
+    /* the relative motion is calculated regarding the system cursor last position */
+    if (relative) {
+        xrel = x;
+        yrel = y;
+        x = (touch->last_x + x);
+        y = (touch->last_y + y);
+    } else {
+        xrel = x - touch->last_x;
+        yrel = y - touch->last_y;
+    }
+
+    /* Drop events that don't change state */
+    if (!xrel && !yrel) {
+#if 0
+        printf("Touch event didn't change state - dropped!\n");
+#endif
+        return 0;
+    }
+
+    /* Update internal touch coordinates */
+    if (touch->relative_mode == SDL_FALSE) {
+        touch->x = x;
+        touch->y = y;
+    } else {
+        touch->x += xrel;
+        touch->y += yrel;
+    }
+
+    SDL_GetWindowSize(touch->focus, &x_max, &y_max);
+
+    /* make sure that the pointers find themselves inside the windows */
+    /* only check if touch->xmax is set ! */
+    if (x_max && touch->x > x_max) {
+        touch->x = x_max;
+    } else if (touch->x < 0) {
+        touch->x = 0;
+    }
+
+    if (y_max && touch->y > y_max) {
+        touch->y = y_max;
+    } else if (touch->y < 0) {
+        touch->y = 0;
+    }
+
+    touch->xdelta += xrel;
+    touch->ydelta += yrel;
+    touch->pressure = pressure;
+
+
+
+    /* Post the event, if desired */
+    posted = 0;
+    if (SDL_GetEventState(SDL_TOUCHMOTION) == SDL_ENABLE &&
+        touch->proximity == SDL_TRUE) {
+        SDL_Event event;
+        event.motion.type = SDL_TOUCHMOTION;
+        event.motion.which = (Uint8) index;
+        event.motion.state = touch->buttonstate;
+        event.motion.x = touch->x;
+        event.motion.y = touch->y;
+        event.motion.z = touch->z;
+        event.motion.pressure = touch->pressure;
+        event.motion.pressure_max = touch->pressure_max;
+        event.motion.pressure_min = touch->pressure_min;
+        event.motion.rotation = 0;
+        event.motion.tilt_x = 0;
+        event.motion.tilt_y = 0;
+        event.motion.cursor = touch->current_end;
+        event.motion.xrel = xrel;
+        event.motion.yrel = yrel;
+        event.motion.windowID = touch->focus ? touch->focus->id : 0;
+        posted = (SDL_PushEvent(&event) > 0);
+    }
+    touch->last_x = touch->x;
+    touch->last_y = touch->y;
+    return posted;
+}
+
+int
+SDL_SendTouchButton(int id, Uint8 state, Uint8 button)
+{
+    int index = SDL_GetTouchIndexId(id);
+    SDL_Touch *touch = SDL_GetTouch(index);
+    int posted;
+    Uint32 type;
+
+    if (!touch) {
+        return 0;
+    }
+
+    /* Figure out which event to perform */
+    switch (state) {
+    case SDL_PRESSED:
+        if (touch->buttonstate & SDL_BUTTON(button)) {
+            /* Ignore this event, no state change */
+            return 0;
+        }
+        type = SDL_TOUCHBUTTONDOWN;
+        touch->buttonstate |= SDL_BUTTON(button);
+        break;
+    case SDL_RELEASED:
+        if (!(touch->buttonstate & SDL_BUTTON(button))) {
+            /* Ignore this event, no state change */
+            return 0;
+        }
+        type = SDL_TOUCHBUTTONUP;
+        touch->buttonstate &= ~SDL_BUTTON(button);
+        break;
+    default:
+        /* Invalid state -- bail */
+        return 0;
+    }
+
+    /* Post the event, if desired */
+    posted = 0;
+    if (SDL_GetEventState(type) == SDL_ENABLE) {
+        SDL_Event event;
+        event.type = type;
+        event.button.which = (Uint8) index;
+        event.button.state = state;
+        event.button.button = button;
+        event.button.x = touch->x;
+        event.button.y = touch->y;
+        event.button.windowID = touch->focus ? touch->focus->id : 0;
+        posted = (SDL_PushEvent(&event) > 0);
+    }
+    return posted;
+}
+
+int
+SDL_SendTouchWheel(int index, int x, int y)
+{
+    SDL_Touch *touch = SDL_GetTouch(index);
+    int posted;
+
+    if (!touch || (!x && !y)) {
+        return 0;
+    }
+
+    /* Post the event, if desired */
+    posted = 0;
+    if (SDL_GetEventState(SDL_TOUCHWHEEL) == SDL_ENABLE) {
+        SDL_Event event;
+        event.type = SDL_TOUCHWHEEL;
+        event.wheel.which = (Uint8) index;
+        event.wheel.x = x;
+        event.wheel.y = y;
+        event.wheel.windowID = touch->focus ? touch->focus->id : 0;
+        posted = (SDL_PushEvent(&event) > 0);
+    }
+    return posted;
+}
+
+
+char *
+SDL_GetTouchName(int index)
+{
+    SDL_Touch *touch = SDL_GetTouch(index);
+    if (!touch) {
+        return NULL;
+    }
+    return touch->name;
+}
+
+void
+SDL_ChangeEnd(int id, int end)
+{
+    int index = SDL_GetTouchIndexId(id);
+    SDL_Touch *touch = SDL_GetTouch(index);
+
+    if (touch) {
+        touch->current_end = end;
+    }
+}
+
+/* vi: set ts=4 sw=4 expandtab: */