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feat(EVE): support fonts with a stride alignment (#8937)

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This commit is contained in:
Liam Howatt
2025-09-29 19:36:10 +02:00
committed by GitHub
parent 3e5ab289f9
commit 2b49fe0217
2 changed files with 34 additions and 4 deletions
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docs/src/details/integration/external_display_controllers/eve/gpu.rst
+19
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@@ -23,6 +23,7 @@ Limitations
- Image format, size, and count limit.
- Font format, size, and count limit.
- Only 4 bpp fonts are supported for now.
- The total number of tasks rendered per refresh has an upper limit.
- Layers are not supported.
@@ -195,6 +196,24 @@ It can be called multiple times with different strings.
lv_draw_eve_pre_upload_font_range(disp, &lv_font_montserrat_48, ':', ':');
Supported Asset Formats
-----------------------
The supported image color formats are RGB565, RGB565A8, ARGB8888, and L8. It's good to
note that RGB565A8 and ARGB8888 are converted to ARGB4444 before being uploaded to EVE. The
implication of this is that a reduced color depth will be realized on the display compared
to the original asset. The initial asset upload time may also be longer.
The only supported font format is 4 bpp. If the font's stride is not 1, it will be converted
to stride 1 before being uploaded to EVE. If the font already has a stride of 1, it will be
uploaded directly without conversion, which can improve asset upload time.
To generate a font with a specific stride (such as 1), you should use the
`offline font converter <https://github.com/lvgl/lv_font_conv>`__ and specify a stride
argument on the command line, e.g. ``--stride 1``. A stride of 0 is the default. This means
that the bits are packed even across rows, but EVE cannot use fonts that are packed across rows.
.. _eve register access:
EVE Register Access
src/draw/eve/lv_draw_eve_letter.c
+15 -4
View File
@@ -34,7 +34,7 @@
static void lv_draw_eve_letter_cb(lv_draw_task_t * t, lv_draw_glyph_dsc_t * glyph_draw_dsc,
lv_draw_fill_dsc_t * fill_draw_dsc, const lv_area_t * fill_area);
static void font_bitmap_to_ramg(uint32_t addr, const uint8_t * src, uint32_t width,
uint32_t height);
uint32_t height, uint8_t src_stride_align);
/**********************
* STATIC VARIABLES
@@ -103,7 +103,8 @@ uint32_t lv_draw_eve_label_upload_glyph(bool burst_is_active, const lv_font_fmt_
EVE_end_cmd_burst();
}
font_bitmap_to_ramg(ramg_addr, glyph_bitmap, g_box_w, g_box_h);
uint8_t glyph_bitmap_stride_align = font_dsc->stride;
font_bitmap_to_ramg(ramg_addr, glyph_bitmap, g_box_w, g_box_h, glyph_bitmap_stride_align);
if(burst_is_active) {
EVE_start_cmd_burst();
@@ -164,16 +165,26 @@ static void lv_draw_eve_letter_cb(lv_draw_task_t * t, lv_draw_glyph_dsc_t * glyp
}
static void font_bitmap_to_ramg(uint32_t addr, const uint8_t * src, uint32_t width,
uint32_t height)
uint32_t height, uint8_t src_stride_align)
{
uint32_t stride = (width + 1) / 2;
if(width % 2 == 0) {
if(src_stride_align == 1 || (src_stride_align == 0 && width % 2 == 0)) {
uint32_t size = stride * height;
EVE_memWrite_flash_buffer(addr, src, size);
return;
}
if(src_stride_align > 0) {
uint32_t src_stride = LV_ALIGN_UP(stride, src_stride_align);
for(uint32_t y = 0; y < height; y++) {
EVE_memWrite_sram_buffer(addr, src, stride);
addr += stride;
src += src_stride;
}
return;
}
uint8_t * row_buf = lv_malloc(stride);
LV_ASSERT_MALLOC(row_buf);