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fix(fbdev): use display offset and clip area to display area (#9668)

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This commit is contained in:
André Costa
2026-02-03 20:44:52 +01:00
committed by GitHub
parent a27766512d
commit a9d0bd1e20
1 changed files with 19 additions and 14 deletions
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src/drivers/display/fb/lv_linux_fbdev.c
+19 -14
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@@ -380,35 +380,40 @@ static void flush_cb(lv_display_t * disp, const lv_area_t * area, uint8_t * colo
}
lv_area_t display_area;
/* vinfo.xres and vinfo.yres will already be 1 less than the actual resolution. i.e: 1023x767 on a 1024x768 screen */
lv_area_set(&display_area, 0, 0, dsc->vinfo.xres, dsc->vinfo.yres);
lv_area_set(&display_area, 0, 0, dsc->vinfo.xres - 1, dsc->vinfo.yres - 1);
/* TODO: Consider rendering the clipped area*/
if(!lv_area_is_in(area, &display_area, 0)) {
/* Clip the area to the display bounds */
lv_area_t clipped_area;
if(!lv_area_intersect(&clipped_area, area, &display_area)) {
/* No intersection at all, nothing to render */
lv_display_flush_ready(disp);
return;
}
uint32_t fb_pos =
(area->x1 + dsc->vinfo.xoffset) * px_size +
(area->y1 + dsc->vinfo.yoffset) * dsc->finfo.line_length;
(clipped_area.x1 + dsc->vinfo.xoffset) * px_size +
(clipped_area.y1 + dsc->vinfo.yoffset) * dsc->finfo.line_length;
const int32_t w = lv_area_get_width(&clipped_area);
const int32_t w = lv_area_get_width(area);
if(LV_LINUX_FBDEV_RENDER_MODE == LV_DISPLAY_RENDER_MODE_DIRECT && rotation == LV_DISPLAY_ROTATION_0) {
uint32_t color_pos =
area->x1 * px_size +
area->y1 * disp->hor_res * px_size;
for(int32_t y = area->y1; y <= area->y2; y++) {
(clipped_area.x1 - disp->offset_x) * px_size +
(clipped_area.y1 - disp->offset_y) * disp->hor_res * px_size;
for(int32_t y = clipped_area.y1; y <= clipped_area.y2; y++) {
write_to_fb(dsc, fb_pos, &color_p[color_pos], w * px_size);
fb_pos += dsc->finfo.line_length;
color_pos += disp->hor_res * px_size;
}
}
else {
const int32_t stride = lv_draw_buf_width_to_stride(w, cf);
for(int32_t y = area->y1; y <= area->y2; y++) {
/* Calculate offset into color_p buffer based on original area */
const int32_t x_offset = clipped_area.x1 - area->x1;
const int32_t y_offset = clipped_area.y1 - area->y1;
const int32_t stride = lv_draw_buf_width_to_stride(lv_area_get_width(area), cf);
color_p += y_offset * stride + x_offset * px_size;
for(int32_t y = clipped_area.y1; y <= clipped_area.y2; y++) {
write_to_fb(dsc, fb_pos, color_p, w * px_size);
fb_pos += dsc->finfo.line_length;
color_p += stride;