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lvgl: Add config to disable monochrome pixel software inversion #87928

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Merged
merged 2 commits into from
Apr 28, 2025
Merged

lvgl: Add config to disable monochrome pixel software inversion #87928

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6c343a4
lvgl: Add config to disable monochrome pixel software inversion
vulporuza Apr 17, 2025
5876ba0
shields: ssd1306: Disable LVGL software screen inversion
vulporuza Mar 31, 2025
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3 changes: 3 additions & 0 deletions boards/shields/ssd1306/Kconfig.defconfig
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,9 @@ config LV_DPI_DEF
config LV_Z_BITS_PER_PIXEL
default 1

config LV_Z_COLOR_MONO_HW_INVERSION
default y

choice LV_COLOR_DEPTH
default LV_COLOR_DEPTH_1
endchoice
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4 changes: 4 additions & 0 deletions doc/releases/release-notes-4.2.rst
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Expand Up @@ -212,6 +212,10 @@ New APIs and options

* :kconfig:option:`CONFIG_NVME_PRP_PAGE_SIZE`

* Other

* :kconfig:option:`CONFIG_LV_Z_COLOR_MONO_HW_INVERSION`

New Boards
**********

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4 changes: 4 additions & 0 deletions modules/lvgl/Kconfig
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Expand Up @@ -94,6 +94,10 @@ config LV_COLOR_16_SWAP
bool "Swap the 2 bytes of RGB565 color."
depends on LV_COLOR_DEPTH_16

config LV_Z_COLOR_MONO_HW_INVERSION
bool "Hardware pixel inversion (disables software pixel inversion)."
depends on LV_COLOR_DEPTH_1

config LV_Z_FLUSH_THREAD
bool "Flush LVGL frames in a separate thread"
help
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8 changes: 8 additions & 0 deletions modules/lvgl/lvgl_display_mono.c
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Expand Up @@ -38,17 +38,25 @@ static ALWAYS_INLINE void set_px_at_pos(uint8_t *dst_buf, uint32_t x, uint32_t y
}
}

#ifdef CONFIG_LV_Z_COLOR_MONO_HW_INVERSION
*buf |= BIT(bit);
#else
if (caps->current_pixel_format == PIXEL_FORMAT_MONO10) {
*buf |= BIT(bit);
} else {
*buf &= ~BIT(bit);
}
#endif
}

static void lvgl_transform_buffer(uint8_t **px_map, uint32_t width, uint32_t height,
const struct display_capabilities *caps)
{
#ifdef CONFIG_LV_Z_COLOR_MONO_HW_INVERSION
uint8_t clear_color = 0x00;
#else
uint8_t clear_color = caps->current_pixel_format == PIXEL_FORMAT_MONO10 ? 0x00 : 0xFF;
#endif

memset(mono_conv_buf, clear_color, mono_conv_buf_size);

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