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feat(linux/fbdev): support non-mmappable frame buffers (#8058)

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Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
This commit is contained in:
Max Filippov
2025-04-10 05:34:41 -07:00
committed by GitHub
parent f35f0859eb
commit ceb5b3b38e
4 changed files with 36 additions and 3 deletions
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Kconfig
+5
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@@ -1872,6 +1872,11 @@ menu "LVGL configuration"
depends on LV_USE_LINUX_FBDEV && LV_LINUX_FBDEV_CUSTOM_BUFFER
default 60
config LV_LINUX_FBDEV_MMAP
bool "Framebuffer device supports mmap"
depends on LV_USE_LINUX_FBDEV
default y
config LV_USE_NUTTX
bool "Use Nuttx to open window and handle touchscreen"
default n
lv_conf_template.h
+1
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@@ -1181,6 +1181,7 @@
#define LV_LINUX_FBDEV_RENDER_MODE LV_DISPLAY_RENDER_MODE_PARTIAL
#define LV_LINUX_FBDEV_BUFFER_COUNT 0
#define LV_LINUX_FBDEV_BUFFER_SIZE 60
#define LV_LINUX_FBDEV_MMAP 1
#endif
/** Use Nuttx to open window and handle touchscreen */
src/drivers/display/fb/lv_linux_fbdev.c
+19 -3
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@@ -59,7 +59,9 @@ typedef struct {
struct fb_var_screeninfo vinfo;
struct fb_fix_screeninfo finfo;
#endif /* LV_LINUX_FBDEV_BSD */
#if LV_LINUX_FBDEV_MMAP
char * fbp;
#endif
uint8_t * rotated_buf;
size_t rotated_buf_size;
long int screensize;
@@ -182,12 +184,14 @@ void lv_linux_fbdev_set_file(lv_display_t * disp, const char * file)
/* Figure out the size of the screen in bytes*/
dsc->screensize = dsc->finfo.smem_len;/*finfo.line_length * vinfo.yres;*/
#if LV_LINUX_FBDEV_MMAP
/* Map the device to memory*/
dsc->fbp = (char *)mmap(0, dsc->screensize, PROT_READ | PROT_WRITE, MAP_SHARED, dsc->fbfd, 0);
if((intptr_t)dsc->fbp == -1) {
perror("Error: failed to map framebuffer device to memory");
return;
}
#endif
/* Don't initialise the memory to retain what's currently displayed / avoid clearing the screen.
* This is important for applications that only draw to a subsection of the full framebuffer.*/
@@ -249,14 +253,27 @@ void lv_linux_fbdev_set_force_refresh(lv_display_t * disp, bool enabled)
* STATIC FUNCTIONS
**********************/
static void write_to_fb(lv_linux_fb_t * dsc, uint32_t fb_pos, const void * data, size_t sz)
{
#if LV_LINUX_FBDEV_MMAP
uint8_t * fbp = (uint8_t *)dsc->fbp;
lv_memcpy(&fbp[fb_pos], data, sz);
#else
if(pwrite(dsc->fbfd, data, sz, fb_pos) < 0)
LV_LOG_ERROR("write failed: %d", errno);
#endif
}
static void flush_cb(lv_display_t * disp, const lv_area_t * area, uint8_t * color_p)
{
lv_linux_fb_t * dsc = lv_display_get_driver_data(disp);
#if LV_LINUX_FBDEV_MMAP
if(dsc->fbp == NULL) {
lv_display_flush_ready(disp);
return;
}
#endif
int32_t w = lv_area_get_width(area);
int32_t h = lv_area_get_height(area);
@@ -315,7 +332,6 @@ static void flush_cb(lv_display_t * disp, const lv_area_t * area, uint8_t * colo
(area->x1 + dsc->vinfo.xoffset) * px_size +
(area->y1 + dsc->vinfo.yoffset) * dsc->finfo.line_length;
uint8_t * fbp = (uint8_t *)dsc->fbp;
int32_t y;
if(LV_LINUX_FBDEV_RENDER_MODE == LV_DISPLAY_RENDER_MODE_DIRECT) {
uint32_t color_pos =
@@ -323,7 +339,7 @@ static void flush_cb(lv_display_t * disp, const lv_area_t * area, uint8_t * colo
area->y1 * disp->hor_res * px_size;
for(y = area->y1; y <= area->y2; y++) {
lv_memcpy(&fbp[fb_pos], &color_p[color_pos], w * px_size);
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;
}
@@ -331,7 +347,7 @@ static void flush_cb(lv_display_t * disp, const lv_area_t * area, uint8_t * colo
else {
w = lv_area_get_width(area);
for(y = area->y1; y <= area->y2; y++) {
lv_memcpy(&fbp[fb_pos], color_p, w * px_size);
write_to_fb(dsc, fb_pos, color_p, w * px_size);
fb_pos += dsc->finfo.line_length;
color_p += w * px_size;
}
src/lv_conf_internal.h
+11
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@@ -3796,6 +3796,17 @@
#define LV_LINUX_FBDEV_BUFFER_SIZE 60
#endif
#endif
#ifndef LV_LINUX_FBDEV_MMAP
#ifdef LV_KCONFIG_PRESENT
#ifdef CONFIG_LV_LINUX_FBDEV_MMAP
#define LV_LINUX_FBDEV_MMAP CONFIG_LV_LINUX_FBDEV_MMAP
#else
#define LV_LINUX_FBDEV_MMAP 0
#endif
#else
#define LV_LINUX_FBDEV_MMAP 1
#endif
#endif
#endif
/** Use Nuttx to open window and handle touchscreen */