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feat(draw_buf): add LV_DRAW_BUF_INIT macro to meet alignment requirement (#6102)

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Signed-off-by: Xu Xingliang <xuxingliang@xiaomi.com>
Co-authored-by: Gabor Kiss-Vamosi <kisvegabor@gmail.com>
This commit is contained in:
Neo Xu
2024-05-09 05:53:28 +08:00
committed by GitHub
parent 46887dbe51
commit dfe50c5952
13 changed files with 47 additions and 24 deletions
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13
examples/widgets/label/lv_example_label_4.c
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@@ -5,11 +5,11 @@
#define MASK_WIDTH 150
#define MASK_HEIGHT 60
static void generate_mask(uint8_t * mask, int32_t w, int32_t h, const char * txt)
static void generate_mask(lv_draw_buf_t * mask, int32_t w, int32_t h, const char * txt)
{
/*Create a "8 bit alpha" canvas and clear it*/
lv_obj_t * canvas = lv_canvas_create(lv_screen_active());
lv_canvas_set_buffer(canvas, mask, w, h, LV_COLOR_FORMAT_L8);
lv_canvas_set_draw_buf(canvas, mask);
lv_canvas_fill_bg(canvas, lv_color_black(), LV_OPA_TRANSP);
lv_layer_t layer;
@@ -36,11 +36,10 @@ static void generate_mask(uint8_t * mask, int32_t w, int32_t h, const char * txt
void lv_example_label_4(void)
{
/* Create the mask of a text by drawing it to a canvas*/
static uint8_t mask[MASK_WIDTH * MASK_HEIGHT];
generate_mask(mask, MASK_WIDTH, MASK_HEIGHT, "Text with gradient");
LV_DRAW_BUF_DEFINE_STATIC(mask, MASK_WIDTH, MASK_HEIGHT, LV_COLOR_FORMAT_L8);
LV_DRAW_BUF_INIT_STATIC(mask);
static lv_draw_buf_t draw_buf;
lv_draw_buf_init(&draw_buf, MASK_WIDTH, MASK_HEIGHT, LV_COLOR_FORMAT_A8, LV_STRIDE_AUTO, mask, sizeof(mask));
generate_mask(&mask, MASK_WIDTH, MASK_HEIGHT, "Text with gradient");
/* Create an object from where the text will be masked out.
* Now it's a rectangle with a gradient but it could be an image too*/
@@ -50,7 +49,7 @@ void lv_example_label_4(void)
lv_obj_set_style_bg_color(grad, lv_color_hex(0xff0000), 0);
lv_obj_set_style_bg_grad_color(grad, lv_color_hex(0x0000ff), 0);
lv_obj_set_style_bg_grad_dir(grad, LV_GRAD_DIR_HOR, 0);
lv_obj_set_style_bitmap_mask_src(grad, &draw_buf, 0);
lv_obj_set_style_bitmap_mask_src(grad, &mask, 0);
}
#endif