display_buffer.h

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#pragma once

#include "esphome/core/component.h"
#include "esphome/core/defines.h"
#include "esphome/core/automation.h"
#include "display_color_utils.h"
#include <cstdarg>
#include <vector>

#ifdef USE_TIME
#include "esphome/components/time/real_time_clock.h"
#endif

#ifdef USE_GRAPH
#include "esphome/components/graph/graph.h"
#endif

#ifdef USE_QR_CODE
#include "esphome/components/qr_code/qr_code.h"
#endif

namespace esphome {
namespace display {

enum class TextAlign {
  TOP = 0x00,
  CENTER_VERTICAL = 0x01,
  BASELINE = 0x02,
  BOTTOM = 0x04,

  LEFT = 0x00,
  CENTER_HORIZONTAL = 0x08,
  RIGHT = 0x10,

  TOP_LEFT = TOP | LEFT,
  TOP_CENTER = TOP | CENTER_HORIZONTAL,
  TOP_RIGHT = TOP | RIGHT,

  CENTER_LEFT = CENTER_VERTICAL | LEFT,
  CENTER = CENTER_VERTICAL | CENTER_HORIZONTAL,
  CENTER_RIGHT = CENTER_VERTICAL | RIGHT,

  BASELINE_LEFT = BASELINE | LEFT,
  BASELINE_CENTER = BASELINE | CENTER_HORIZONTAL,
  BASELINE_RIGHT = BASELINE | RIGHT,

  BOTTOM_LEFT = BOTTOM | LEFT,
  BOTTOM_CENTER = BOTTOM | CENTER_HORIZONTAL,
  BOTTOM_RIGHT = BOTTOM | RIGHT,
};

extern const Color COLOR_OFF;
extern const Color COLOR_ON;

enum ImageType {
  IMAGE_TYPE_BINARY = 0,
  IMAGE_TYPE_GRAYSCALE = 1,
  IMAGE_TYPE_RGB24 = 2,
  IMAGE_TYPE_TRANSPARENT_BINARY = 3,
  IMAGE_TYPE_RGB565 = 4,
};

enum DisplayType {
  DISPLAY_TYPE_BINARY = 1,
  DISPLAY_TYPE_GRAYSCALE = 2,
  DISPLAY_TYPE_COLOR = 3,
};

enum DisplayRotation {
  DISPLAY_ROTATION_0_DEGREES = 0,
  DISPLAY_ROTATION_90_DEGREES = 90,
  DISPLAY_ROTATION_180_DEGREES = 180,
  DISPLAY_ROTATION_270_DEGREES = 270,
};

static const int16_t VALUE_NO_SET = 32766;

class Rect {
 public:
  int16_t x;  
  int16_t y;  
  int16_t w;  
  int16_t h;  

  Rect() : x(VALUE_NO_SET), y(VALUE_NO_SET), w(VALUE_NO_SET), h(VALUE_NO_SET) {}  // NOLINT
  inline Rect(int16_t x, int16_t y, int16_t w, int16_t h) ALWAYS_INLINE : x(x), y(y), w(w), h(h) {}
  inline int16_t x2() { return this->x + this->w; };  
  inline int16_t y2() { return this->y + this->h; };  

  inline bool is_set() ALWAYS_INLINE { return (this->h != VALUE_NO_SET) && (this->w != VALUE_NO_SET); }

  void expand(int16_t horizontal, int16_t vertical);

  void extend(Rect rect);
  void shrink(Rect rect);

  bool inside(Rect rect, bool absolute = true);
  bool inside(int16_t test_x, int16_t test_y, bool absolute = true);
  bool equal(Rect rect);
  void info(const std::string &prefix = "rect info:");
};

class Font;
class Image;
class DisplayBuffer;
class DisplayPage;
class DisplayOnPageChangeTrigger;

using display_writer_t = std::function<void(DisplayBuffer &)>;

#define LOG_DISPLAY(prefix, type, obj) \
  if ((obj) != nullptr) { \
    ESP_LOGCONFIG(TAG, prefix type); \
    ESP_LOGCONFIG(TAG, "%s  Rotations: %d °", prefix, (obj)->rotation_); \
    ESP_LOGCONFIG(TAG, "%s  Dimensions: %dpx x %dpx", prefix, (obj)->get_width(), (obj)->get_height()); \
  }

class DisplayBuffer {
 public:
  virtual void fill(Color color);
  void clear();

  int get_width();
  int get_height();

  void draw_pixel_at(int x, int y, Color color = COLOR_ON);

  void line(int x1, int y1, int x2, int y2, Color color = COLOR_ON);

  void horizontal_line(int x, int y, int width, Color color = COLOR_ON);

  void vertical_line(int x, int y, int height, Color color = COLOR_ON);

  void rectangle(int x1, int y1, int width, int height, Color color = COLOR_ON);

  void filled_rectangle(int x1, int y1, int width, int height, Color color = COLOR_ON);

  void circle(int center_x, int center_xy, int radius, Color color = COLOR_ON);

  void filled_circle(int center_x, int center_y, int radius, Color color = COLOR_ON);

  void print(int x, int y, Font *font, Color color, TextAlign align, const char *text);

  void print(int x, int y, Font *font, Color color, const char *text);

  void print(int x, int y, Font *font, TextAlign align, const char *text);

  void print(int x, int y, Font *font, const char *text);

  void printf(int x, int y, Font *font, Color color, TextAlign align, const char *format, ...)
      __attribute__((format(printf, 7, 8)));

  void printf(int x, int y, Font *font, Color color, const char *format, ...) __attribute__((format(printf, 6, 7)));

  void printf(int x, int y, Font *font, TextAlign align, const char *format, ...) __attribute__((format(printf, 6, 7)));

  void printf(int x, int y, Font *font, const char *format, ...) __attribute__((format(printf, 5, 6)));

#ifdef USE_TIME

  void strftime(int x, int y, Font *font, Color color, TextAlign align, const char *format, time::ESPTime time)
      __attribute__((format(strftime, 7, 0)));

  void strftime(int x, int y, Font *font, Color color, const char *format, time::ESPTime time)
      __attribute__((format(strftime, 6, 0)));

  void strftime(int x, int y, Font *font, TextAlign align, const char *format, time::ESPTime time)
      __attribute__((format(strftime, 6, 0)));

  void strftime(int x, int y, Font *font, const char *format, time::ESPTime time)
      __attribute__((format(strftime, 5, 0)));
#endif

  void image(int x, int y, Image *image, Color color_on = COLOR_ON, Color color_off = COLOR_OFF);

#ifdef USE_GRAPH

  void graph(int x, int y, graph::Graph *graph, Color color_on = COLOR_ON);

  void legend(int x, int y, graph::Graph *graph, Color color_on = COLOR_ON);
#endif  // USE_GRAPH

#ifdef USE_QR_CODE

  void qr_code(int x, int y, qr_code::QrCode *qr_code, Color color_on = COLOR_ON, int scale = 1);
#endif

  void get_text_bounds(int x, int y, const char *text, Font *font, TextAlign align, int *x1, int *y1, int *width,
                       int *height);

  void set_writer(display_writer_t &&writer);

  void show_page(DisplayPage *page);
  void show_next_page();
  void show_prev_page();

  void set_pages(std::vector<DisplayPage *> pages);

  const DisplayPage *get_active_page() const { return this->page_; }

  void add_on_page_change_trigger(DisplayOnPageChangeTrigger *t) { this->on_page_change_triggers_.push_back(t); }

  void set_rotation(DisplayRotation rotation);

  // Internal method to set display auto clearing.
  void set_auto_clear(bool auto_clear_enabled) { this->auto_clear_enabled_ = auto_clear_enabled; }

  virtual int get_height_internal() = 0;
  virtual int get_width_internal() = 0;
  DisplayRotation get_rotation() const { return this->rotation_; }

  virtual DisplayType get_display_type() = 0;

  void start_clipping(Rect rect);
  void start_clipping(int16_t left, int16_t top, int16_t right, int16_t bottom) {
    start_clipping(Rect(left, top, right - left, bottom - top));
  };

  void extend_clipping(Rect rect);
  void extend_clipping(int16_t left, int16_t top, int16_t right, int16_t bottom) {
    this->extend_clipping(Rect(left, top, right - left, bottom - top));
  };

  void shrink_clipping(Rect rect);
  void shrink_clipping(uint16_t left, uint16_t top, uint16_t right, uint16_t bottom) {
    this->shrink_clipping(Rect(left, top, right - left, bottom - top));
  };

  void end_clipping();

  Rect get_clipping();

  bool is_clipping() const { return !this->clipping_rectangle_.empty(); }

 protected:
  void vprintf_(int x, int y, Font *font, Color color, TextAlign align, const char *format, va_list arg);

  virtual void draw_absolute_pixel_internal(int x, int y, Color color) = 0;

  void init_internal_(uint32_t buffer_length);

  void do_update_();

  uint8_t *buffer_{nullptr};
  DisplayRotation rotation_{DISPLAY_ROTATION_0_DEGREES};
  optional<display_writer_t> writer_{};
  DisplayPage *page_{nullptr};
  DisplayPage *previous_page_{nullptr};
  std::vector<DisplayOnPageChangeTrigger *> on_page_change_triggers_;
  bool auto_clear_enabled_{true};
  std::vector<Rect> clipping_rectangle_;
};

class DisplayPage {
 public:
  DisplayPage(display_writer_t writer);
  void show();
  void show_next();
  void show_prev();
  void set_parent(DisplayBuffer *parent);
  void set_prev(DisplayPage *prev);
  void set_next(DisplayPage *next);
  const display_writer_t &get_writer() const;

 protected:
  DisplayBuffer *parent_;
  display_writer_t writer_;
  DisplayPage *prev_{nullptr};
  DisplayPage *next_{nullptr};
};

struct GlyphData {
  const char *a_char;
  const uint8_t *data;
  int offset_x;
  int offset_y;
  int width;
  int height;
};

class Glyph {
 public:
  Glyph(const GlyphData *data) : glyph_data_(data) {}

  bool get_pixel(int x, int y) const;

  const char *get_char() const;

  bool compare_to(const char *str) const;

  int match_length(const char *str) const;

  void scan_area(int *x1, int *y1, int *width, int *height) const;

 protected:
  friend Font;
  friend DisplayBuffer;

  const GlyphData *glyph_data_;
};

class Font {
 public:
  Font(const GlyphData *data, int data_nr, int baseline, int height);

  int match_next_glyph(const char *str, int *match_length);

  void measure(const char *str, int *width, int *x_offset, int *baseline, int *height);
  inline int get_baseline() { return this->baseline_; }
  inline int get_height() { return this->height_; }

  const std::vector<Glyph, ExternalRAMAllocator<Glyph>> &get_glyphs() const { return glyphs_; }

 protected:
  std::vector<Glyph, ExternalRAMAllocator<Glyph>> glyphs_;
  int baseline_;
  int height_;
};

class Image {
 public:
  Image(const uint8_t *data_start, int width, int height, ImageType type);
  virtual bool get_pixel(int x, int y) const;
  virtual Color get_color_pixel(int x, int y) const;
  virtual Color get_rgb565_pixel(int x, int y) const;
  virtual Color get_grayscale_pixel(int x, int y) const;
  int get_width() const;
  int get_height() const;
  ImageType get_type() const;

  virtual int get_current_frame() const;

 protected:
  int width_;
  int height_;
  ImageType type_;
  const uint8_t *data_start_;
};

class Animation : public Image {
 public:
  Animation(const uint8_t *data_start, int width, int height, uint32_t animation_frame_count, ImageType type);
  bool get_pixel(int x, int y) const override;
  Color get_color_pixel(int x, int y) const override;
  Color get_rgb565_pixel(int x, int y) const override;
  Color get_grayscale_pixel(int x, int y) const override;

  int get_animation_frame_count() const;
  int get_current_frame() const override;
  void next_frame();
  void prev_frame();

  void set_frame(int frame);

 protected:
  int current_frame_;
  int animation_frame_count_;
};

template<typename... Ts> class DisplayPageShowAction : public Action<Ts...> {
 public:
  TEMPLATABLE_VALUE(DisplayPage *, page)

  void play(Ts... x) override {
    auto *page = this->page_.value(x...);
    if (page != nullptr) {
      page->show();
    }
  }
};

template<typename... Ts> class DisplayPageShowNextAction : public Action<Ts...> {
 public:
  DisplayPageShowNextAction(DisplayBuffer *buffer) : buffer_(buffer) {}

  void play(Ts... x) override { this->buffer_->show_next_page(); }

  DisplayBuffer *buffer_;
};

template<typename... Ts> class DisplayPageShowPrevAction : public Action<Ts...> {
 public:
  DisplayPageShowPrevAction(DisplayBuffer *buffer) : buffer_(buffer) {}

  void play(Ts... x) override { this->buffer_->show_prev_page(); }

  DisplayBuffer *buffer_;
};

template<typename... Ts> class DisplayIsDisplayingPageCondition : public Condition<Ts...> {
 public:
  DisplayIsDisplayingPageCondition(DisplayBuffer *parent) : parent_(parent) {}

  void set_page(DisplayPage *page) { this->page_ = page; }
  bool check(Ts... x) override { return this->parent_->get_active_page() == this->page_; }

 protected:
  DisplayBuffer *parent_;
  DisplayPage *page_;
};

class DisplayOnPageChangeTrigger : public Trigger<DisplayPage *, DisplayPage *> {
 public:
  explicit DisplayOnPageChangeTrigger(DisplayBuffer *parent) { parent->add_on_page_change_trigger(this); }
  void process(DisplayPage *from, DisplayPage *to);
  void set_from(DisplayPage *p) { this->from_ = p; }
  void set_to(DisplayPage *p) { this->to_ = p; }

 protected:
  DisplayPage *from_{nullptr};
  DisplayPage *to_{nullptr};
};

}  // namespace display
}  // namespace esphome