2f3e8d4066
It caches SW rendered bitmaps in textures. The cache is also updated to support data and source separately. E.g. source is a path to an image, and if that image changes all related cache entries needs to found and invalidated. Limitations of SDL rederer: - not all draw task types are supported - image transformation is not supported - some textures (e.g. button matrix texts) are not detected as cached - images are not cached - images are supported only from path
39 lines
1.1 KiB
C
39 lines
1.1 KiB
C
#include "../../lv_examples.h"
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#if LV_USE_CANVAS && LV_FONT_MONTSERRAT_18 && LV_BUILD_EXAMPLES
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#define CANVAS_WIDTH 50
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#define CANVAS_HEIGHT 50
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/**
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* Draw a text to the canvas
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*/
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void lv_example_canvas_4(void)
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{
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/*Create a buffer for the canvas*/
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static uint8_t cbuf[LV_CANVAS_BUF_SIZE(CANVAS_WIDTH, CANVAS_HEIGHT, 32, LV_DRAW_BUF_STRIDE_ALIGN)];
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/*Create a canvas and initialize its palette*/
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lv_obj_t * canvas = lv_canvas_create(lv_screen_active());
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lv_canvas_set_buffer(canvas, cbuf, CANVAS_WIDTH, CANVAS_HEIGHT, LV_COLOR_FORMAT_ARGB8888);
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lv_canvas_fill_bg(canvas, lv_color_hex3(0xccc), LV_OPA_COVER);
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lv_obj_center(canvas);
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lv_layer_t layer;
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lv_canvas_init_layer(canvas, &layer);
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lv_draw_label_dsc_t dsc;
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lv_draw_label_dsc_init(&dsc);
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dsc.color = lv_palette_main(LV_PALETTE_RED);
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dsc.font = &lv_font_montserrat_18;
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dsc.decor = LV_TEXT_DECOR_UNDERLINE;
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dsc.text = "Hello";
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lv_area_t coords = {10, 10, 30, 60};
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lv_draw_label(&layer, &dsc, &coords);
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lv_canvas_finish_layer(canvas, &layer);
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}
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#endif
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