struct video_viewport vp;
float x = AMotionEvent_getX(event, motion_ptr);
float y = AMotionEvent_getY(event, motion_ptr);
vp.x = 0;
vp.y = 0;
vp.width = 0;
vp.height = 0;
vp.full_width = 0;
vp.full_height = 0;
video_driver_translate_coord_viewport_wrap(
&vp,
x, y,
&android->pointer[motion_ptr].x,
&android->pointer[motion_ptr].y,
&android->pointer[motion_ptr].full_x,
&android->pointer[motion_ptr].full_y);
from video_driver.h
#define video_driver_translate_coord_viewport_wrap(vp, mouse_x, mouse_y, res_x, res_y, res_screen_x, res_screen_y) \
(video_driver_get_viewport_info(vp) ? video_driver_translate_coord_viewport(vp, mouse_x, mouse_y, res_x, res_y, res_screen_x, res_screen_y) : false)
from video_driver.c
/**
* video_driver_translate_coord_viewport:
* @mouse_x : Pointer X coordinate.
* @mouse_y : Pointer Y coordinate.
* @res_x : Scaled X coordinate.
* @res_y : Scaled Y coordinate.
* @res_screen_x : Scaled screen X coordinate.
* @res_screen_y : Scaled screen Y coordinate.
*
* Translates pointer [X,Y] coordinates into scaled screen
* coordinates based on viewport info.
*
* Returns: true (1) if successful, false if video driver doesn't support
* viewport info.
**/
bool video_driver_translate_coord_viewport(
void *data,
int mouse_x, int mouse_y,
int16_t *res_x, int16_t *res_y,
int16_t *res_screen_x, int16_t *res_screen_y)
{
int scaled_screen_x, scaled_screen_y, scaled_x, scaled_y;
struct video_viewport *vp = (struct video_viewport*)data;
int norm_vp_width = (int)vp->width;
int norm_vp_height = (int)vp->height;
int norm_full_vp_width = (int)vp->full_width;
int norm_full_vp_height = (int)vp->full_height;
if (norm_full_vp_width <= 0 || norm_full_vp_height <= 0)
return false;
if (mouse_x >= 0 && mouse_x <= norm_full_vp_width)
scaled_screen_x = ((2 * mouse_x * 0x7fff) / norm_full_vp_width) - 0x7fff;
else
scaled_screen_x = -0x8000; /* OOB */
if (mouse_y >= 0 && mouse_y <= norm_full_vp_height)
scaled_screen_y = ((2 * mouse_y * 0x7fff) / norm_full_vp_height) - 0x7fff;
else
scaled_screen_y = -0x8000; /* OOB */
mouse_x -= vp->x;
mouse_y -= vp->y;
if (mouse_x >= 0 && mouse_x <= norm_vp_width)
scaled_x = ((2 * mouse_x * 0x7fff) / norm_vp_width) - 0x7fff;
else
scaled_x = -0x8000; /* OOB */
if (mouse_y >= 0 && mouse_y <= norm_vp_height)
scaled_y = ((2 * mouse_y * 0x7fff) / norm_vp_height) - 0x7fff;
else
scaled_y = -0x8000; /* OOB */
*res_x = scaled_x;
*res_y = scaled_y;
*res_screen_x = scaled_screen_x;
*res_screen_y = scaled_screen_y;
return true;
}