-
-/* Try to determine frame pixel position and size of the glyph under
- frame pixel coordinates X/Y on frame F . Return the position and
- size in *RECT. Value is non-zero if we could compute these
- values. */
-
-static int
-glyph_rect (f, x, y, rect)
- struct frame *f;
- int x, y;
- RECT *rect;
-{
- Lisp_Object window;
-
- window = window_from_coordinates (f, x, y, 0, &x, &y, 0);
-
- if (!NILP (window))
- {
- struct window *w = XWINDOW (window);
- struct glyph_row *r = MATRIX_FIRST_TEXT_ROW (w->current_matrix);
- struct glyph_row *end = r + w->current_matrix->nrows - 1;
-
- for (; r < end && r->enabled_p; ++r)
- if (r->y <= y && r->y + r->height > y)
- {
- /* Found the row at y. */
- struct glyph *g = r->glyphs[TEXT_AREA];
- struct glyph *end = g + r->used[TEXT_AREA];
- int gx;
-
- rect->top = WINDOW_TO_FRAME_PIXEL_Y (w, r->y);
- rect->bottom = rect->top + r->height;
-
- if (x < r->x)
- {
- /* x is to the left of the first glyph in the row. */
- /* Shouldn't this be a pixel value?
- WINDOW_LEFT_EDGE_X (w) seems to be the right value.
- ++KFS */
- rect->left = WINDOW_LEFT_EDGE_COL (w);
- rect->right = WINDOW_TO_FRAME_PIXEL_X (w, r->x);
- return 1;
- }
-
- for (gx = r->x; g < end; gx += g->pixel_width, ++g)
- if (gx <= x && gx + g->pixel_width > x)
- {
- /* x is on a glyph. */
- rect->left = WINDOW_TO_FRAME_PIXEL_X (w, gx);
- rect->right = rect->left + g->pixel_width;
- return 1;
- }
-
- /* x is to the right of the last glyph in the row. */
- rect->left = WINDOW_TO_FRAME_PIXEL_X (w, gx);
- /* Shouldn't this be a pixel value?
- WINDOW_RIGHT_EDGE_X (w) seems to be the right value.
- ++KFS */
- rect->right = WINDOW_RIGHT_EDGE_COL (w);
- return 1;
- }
- }
-
- /* The y is not on any row. */
- return 0;
-}
-
-/* Record the position of the mouse in last_mouse_glyph. */
-static void
-remember_mouse_glyph (f1, gx, gy)
- struct frame * f1;
- int gx, gy;
-{
- if (!glyph_rect (f1, gx, gy, &last_mouse_glyph))
- {
- int width = FRAME_SMALLEST_CHAR_WIDTH (f1);
- int height = FRAME_SMALLEST_FONT_HEIGHT (f1);
-
- /* Arrange for the division in FRAME_PIXEL_X_TO_COL etc. to
- round down even for negative values. */
- if (gx < 0)
- gx -= width - 1;
- if (gy < 0)
- gy -= height - 1;
-#if 0
- /* This was the original code from XTmouse_position, but it seems
- to give the position of the glyph diagonally next to the one
- the mouse is over. */
- gx = (gx + width - 1) / width * width;
- gy = (gy + height - 1) / height * height;
-#else
- gx = gx / width * width;
- gy = gy / height * height;
-#endif
-
- last_mouse_glyph.left = gx;
- last_mouse_glyph.top = gy;
- last_mouse_glyph.right = gx + width;
- last_mouse_glyph.bottom = gy + height;
- }
-}
-