working lcd small quer

libraries/lvgl/src/draw/lv_draw_label.h

@@ -0,0 +1,167 @@
+/**
+ * @file lv_draw_label.h
+ *
+ */
+
+#ifndef LV_DRAW_LABEL_H
+#define LV_DRAW_LABEL_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*********************
+ *      INCLUDES
+ *********************/
+#include "lv_draw.h"
+#include "../misc/lv_bidi.h"
+#include "../misc/lv_text.h"
+#include "../misc/lv_color.h"
+#include "../misc/lv_style.h"
+
+/*********************
+ *      DEFINES
+ *********************/
+#define LV_DRAW_LABEL_NO_TXT_SEL (0xFFFF)
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+/** Store some info to speed up drawing of very large texts
+ * It takes a lot of time to get the first visible character because
+ * all the previous characters needs to be checked to calculate the positions.
+ * This structure stores an earlier (e.g. at -1000 px) coordinate and the index of that line.
+ * Therefore the calculations can start from here.*/
+typedef struct _lv_draw_label_hint_t {
+    /** Index of the line at `y` coordinate*/
+    int32_t line_start;
+
+    /** Give the `y` coordinate of the first letter at `line start` index. Relative to the label's coordinates*/
+    int32_t y;
+
+    /** The 'y1' coordinate of the label when the hint was saved.
+     * Used to invalidate the hint if the label has moved too much.*/
+    int32_t coord_y;
+} lv_draw_label_hint_t;
+
+typedef struct {
+    lv_draw_dsc_base_t base;
+
+    const char * text;
+    const lv_font_t * font;
+    uint32_t sel_start;
+    uint32_t sel_end;
+    lv_color_t color;
+    lv_color_t sel_color;
+    lv_color_t sel_bg_color;
+    int32_t line_space;
+    int32_t letter_space;
+    int32_t ofs_x;
+    int32_t ofs_y;
+    lv_opa_t opa;
+    lv_base_dir_t bidi_dir;
+    lv_text_align_t align;
+    lv_text_flag_t flag;
+    lv_text_decor_t decor : 3;
+    lv_blend_mode_t blend_mode : 3;
+    /**
+     * < 1: malloc buffer and copy `text` there.
+     * 0: `text` is const and it's pointer will be valid during rendering.*/
+    uint8_t text_local : 1;
+    lv_draw_label_hint_t * hint;
+} lv_draw_label_dsc_t;
+
+typedef struct {
+    void * glyph_data;  /*Depends on `format` field, it could be image source or draw buf of bitmap or vector data.*/
+    lv_font_glyph_format_t format;
+    const lv_area_t * letter_coords;
+    const lv_area_t * bg_coords;
+    const lv_font_glyph_dsc_t * g;
+    lv_color_t color;
+    lv_opa_t opa;
+    lv_draw_buf_t * _draw_buf; /*a shared draw buf for get_bitmap, do not use it directly, use glyph_data instead*/
+} lv_draw_glyph_dsc_t;
+
+/**
+ * Passed as a parameter to `lv_draw_label_iterate_characters` to
+ * draw the characters one by one
+ * @param draw_unit     pointer to a draw unit
+ * @param dsc           pointer to `lv_draw_glyph_dsc_t` to describe the character to draw
+ *                      if NULL don't draw character
+ * @param fill_dsc      pointer to a fill descriptor to draw a background for the character or
+ *                      underline or strike through
+ *                      if NULL do not fill anything
+ * @param fill_area     the area to fill
+ *                      if NULL do not fill anything
+ */
+typedef void(*lv_draw_glyph_cb_t)(lv_draw_unit_t * draw_unit, lv_draw_glyph_dsc_t * dsc, lv_draw_fill_dsc_t * fill_dsc,
+                                  const lv_area_t * fill_area);
+
+/**********************
+ * GLOBAL PROTOTYPES
+ **********************/
+
+/**
+ * Initialize a label draw descriptor
+ * @param dsc       pointer to a draw descriptor
+ */
+void /* LV_ATTRIBUTE_FAST_MEM */ lv_draw_label_dsc_init(lv_draw_label_dsc_t * dsc);
+
+/**
+ * Try to get a label draw descriptor from a draw task.
+ * @param task      draw task
+ * @return          the task's draw descriptor or NULL if the task is not of type LV_DRAW_TASK_TYPE_LABEL
+ */
+lv_draw_label_dsc_t * lv_draw_task_get_label_dsc(lv_draw_task_t * task);
+
+/**
+ * Initialize a glyph draw descriptor.
+ * Used internally.
+ * @param dsc       pointer to a draw descriptor
+ */
+void lv_draw_glyph_dsc_init(lv_draw_glyph_dsc_t * dsc);
+
+/**
+ * Crate a draw task to render a text
+ * @param layer         pointer to a layer
+ * @param dsc           pointer to draw descriptor
+ * @param coords        coordinates of the character
+ */
+void /* LV_ATTRIBUTE_FAST_MEM */ lv_draw_label(lv_layer_t * layer, const lv_draw_label_dsc_t * dsc,
+                                               const lv_area_t * coords);
+
+/**
+ * Crate a draw task to render a single character
+ * @param layer          pointer to a layer
+ * @param dsc            pointer to draw descriptor
+ * @param point          position of the label
+ * @param unicode_letter the letter to draw
+ */
+void /* LV_ATTRIBUTE_FAST_MEM */ lv_draw_character(lv_layer_t * layer, lv_draw_label_dsc_t * dsc,
+                                                   const lv_point_t * point, uint32_t unicode_letter);
+
+/**
+ * Should be used during rendering the characters to get the position and other
+ * parameters of the characters
+ * @param draw_unit     pointer to a draw unit
+ * @param dsc           pointer to draw descriptor
+ * @param coords        coordinates of the label
+ * @param cb            a callback to call to draw each glyphs one by one
+ */
+void lv_draw_label_iterate_characters(lv_draw_unit_t * draw_unit, const lv_draw_label_dsc_t * dsc,
+                                      const lv_area_t * coords, lv_draw_glyph_cb_t cb);
+
+/***********************
+ * GLOBAL VARIABLES
+ ***********************/
+
+/**********************
+ *      MACROS
+ **********************/
+
+#ifdef __cplusplus
+} /*extern "C"*/
+#endif
+
+#endif /*LV_DRAW_LABEL_H*/