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RISC OS: Plotters: On RISC OS y1 is top and y0 is bottom.

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When storing RISC OS coordinates, use y0 and y1 consistently.
This commit is contained in:
Michael Drake 2021-04-25 20:30:05 +01:00
parent 81c40ab7c2
commit fb8c227ff0
1 changed files with 16 additions and 11 deletions
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27
frontends/riscos/plotters.c
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@ -110,12 +110,17 @@ ro_plot_clip(const struct redraw_context *ctx, const struct rect *clip)
os_error *error;
char buf[12];
int clip_x0 = ro_plot_origin_x + clip->x0 * 2;
int clip_y0 = ro_plot_origin_y - clip->y0 * 2 - 1;
int clip_x1 = ro_plot_origin_x + clip->x1 * 2 - 1;
int clip_y1 = ro_plot_origin_y - clip->y1 * 2;
int clip_x0 = clip->x0 * 2;
int clip_y0 = clip->y1 * 2;
int clip_x1 = clip->x1 * 2;
int clip_y1 = clip->y0 * 2;
if (clip_x1 < clip_x0 || clip_y0 < clip_y1) {
clip_x0 = ro_plot_origin_x + clip_x0;
clip_y0 = ro_plot_origin_y - clip_y0;
clip_x1 = ro_plot_origin_x + clip_x1 - 1;
clip_y1 = ro_plot_origin_y - clip_y1 - 1;
if (clip_x1 < clip_x0 || clip_y1 < clip_y0) {
NSLOG(netsurf, INFO, "bad clip rectangle %i %i %i %i",
clip_x0, clip_y0, clip_x1, clip_y1);
return NSERROR_BAD_SIZE;
@ -124,12 +129,12 @@ ro_plot_clip(const struct redraw_context *ctx, const struct rect *clip)
buf[0] = os_VDU_SET_GRAPHICS_WINDOW;
buf[1] = clip_x0;
buf[2] = clip_x0 >> 8;
buf[3] = clip_y1;
buf[4] = clip_y1 >> 8;
buf[3] = clip_y0;
buf[4] = clip_y0 >> 8;
buf[5] = clip_x1;
buf[6] = clip_x1 >> 8;
buf[7] = clip_y0;
buf[8] = clip_y0 >> 8;
buf[7] = clip_y1;
buf[8] = clip_y1 >> 8;
error = xos_writen(buf, 9);
if (error) {
@ -365,7 +370,7 @@ ro_plot_rectangle(const struct redraw_context *ctx,
error = xos_plot(os_MOVE_TO,
ro_plot_origin_x + rect->x0 * 2,
ro_plot_origin_y - rect->y0 * 2 - 1);
ro_plot_origin_y - rect->y1 * 2);
if (error) {
NSLOG(netsurf, INFO, "xos_plot: 0x%x: %s",
error->errnum, error->errmess);
@ -374,7 +379,7 @@ ro_plot_rectangle(const struct redraw_context *ctx,
error = xos_plot(os_PLOT_RECTANGLE | os_PLOT_TO,
ro_plot_origin_x + rect->x1 * 2 - 1,
ro_plot_origin_y - rect->y1 * 2);
ro_plot_origin_y - rect->y0 * 2 - 1);
if (error) {
NSLOG(netsurf, INFO, "xos_plot: 0x%x: %s",
error->errnum, error->errmess);