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Document setting up of clip rectangle for NetSurf's core. 

svn path=/trunk/netsurf/; revision=6348
This commit is contained in:
Michael Drake 2009-02-01 23:56:38 +00:00
parent 3cb9376483
commit a15d9876ca
1 changed files with 13 additions and 4 deletions
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17
riscos/window.c
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@ -1446,12 +1446,21 @@ void ro_gui_window_redraw(wimp_draw *redraw)
while (more) {
int clip_x0, clip_y0, clip_x1, clip_y1;
/* OS's redraw request coordinates are in screen coordinates,
* with an origin at the bottom left of the screen.
* Find the coordinate of the top left of the document in terms
* of OS screen coordinates.
* NOTE: OS units are 2 per px. */
ro_plot_origin_x = redraw->box.x0 - redraw->xscroll;
ro_plot_origin_y = redraw->box.y1 - redraw->yscroll;
clip_x0 = (redraw->clip.x0 - ro_plot_origin_x) / 2;
clip_y0 = (ro_plot_origin_y - redraw->clip.y1) / 2;
clip_x1 = (redraw->clip.x1 - ro_plot_origin_x) / 2;
clip_y1 = (ro_plot_origin_y - redraw->clip.y0) / 2;
/* Convert OS redraw rectangle request coordinates into NetSurf
* coordinates. NetSurf coordinates have origin at top left of
* document and units are in px. */
clip_x0 = (redraw->clip.x0 - ro_plot_origin_x) / 2; /* left */
clip_y0 = (ro_plot_origin_y - redraw->clip.y1) / 2; /* top */
clip_x1 = (redraw->clip.x1 - ro_plot_origin_x) / 2; /* right */
clip_y1 = (ro_plot_origin_y - redraw->clip.y0) / 2; /* bottom */
if (ro_gui_current_redraw_gui->option.buffer_everything)
ro_gui_buffer_open(redraw);