From 6fdfdf68e3955d787c704961aa924ee85fd0982f Mon Sep 17 00:00:00 2001
From: martinberlin <martin@luckycloud.de>
Date: Sat, 9 Dec 2023 00:20:34 +0100
Subject: [PATCH] #266 Preparation to get Kaleido color lookup

---
 examples/color/main/main.c | 28 +++++++++++++++++-----------
 src/epdiy.c                | 16 ++++++++++++++++
 src/epdiy.h                |  6 ++++++
 3 files changed, 39 insertions(+), 11 deletions(-)

diff --git a/examples/color/main/main.c b/examples/color/main/main.c
index fd95164f..aeddf822 100644
--- a/examples/color/main/main.c
+++ b/examples/color/main/main.c
@@ -17,11 +17,11 @@ int color_test() {
   EpdRect epd_area = {
       .x = 0,
       .y = 0,
-      .width = epd_width()/2,
+      .width = epd_width(),
       .height = epd_height()
   };
 
-  uint8_t color_of = 0;
+  uint8_t color_of = 255;
   /**
    * @brief PATTERN
    * pix1     2    3  X
@@ -29,19 +29,20 @@ int color_test() {
    *    G     R    B  row:2
    *    R     B    G  row:3
    */
-  for (uint16_t y=1; y<epd_area.height; y++) {
+  for (uint16_t y=1; y<601; y++) {
     for (uint16_t x=1; x<epd_area.width; x++) {
       // x, y, r, g, b
-      if (y < 560) {
-        epd_draw_cpixel(x, y, x/10, color_of, color_of, hl.front_fb);
-      } else if (y >= 560 && y < 1120) {
-        epd_draw_cpixel(x, y, color_of, x/10, color_of, hl.front_fb);
+      if (y < 200) {
+        epd_draw_cpixel(x, y, x/6, color_of, color_of, hl.front_fb);
+      } else if (y >= 200 && y < 400) {
+        epd_draw_cpixel(x, y, color_of, x/6, color_of, hl.front_fb);
       } else {
-        epd_draw_cpixel(x, y, color_of, color_of, x/10, hl.front_fb);
+        epd_draw_cpixel(x, y, color_of, color_of, x/6, hl.front_fb);
       }
     }
-    vTaskDelay(1);
+    //vTaskDelay(1);
   }
+  
 
   enum EpdDrawError _err = epd_hl_update_screen(&hl, MODE_GC16, temperature);
   epd_poweroff();
@@ -61,7 +62,8 @@ int getFreePsram(){
 void app_main() {
   printf("before epd_init() Free PSRAM: %d\n", getFreePsram());
 
-  epd_init(&epd_board_v7, &epdiy_GDEW101C01, EPD_LUT_64K);
+  epd_init(&epd_board_v7, &EC060KH3, EPD_LUT_64K);
+  //epd_set_rotation(EPD_ROT_PORTRAIT);
   // Set VCOM for boards that allow to set this in software (in mV).
   epd_set_vcom(1560);
   hl = epd_hl_init(EPD_BUILTIN_WAVEFORM);
@@ -69,7 +71,11 @@ void app_main() {
   printf("after epd_hl_init() Free PSRAM: %d\n", getFreePsram());
 
 
-  epd_poweron();  
+  epd_poweron();
+  epd_set_gamma_curve(0.4);
+  epd_fullclear(&hl, 25);
+
+
   color_test();
   printf("color example\n");
 
diff --git a/src/epdiy.c b/src/epdiy.c
index c02717c9..9e3f78e3 100644
--- a/src/epdiy.c
+++ b/src/epdiy.c
@@ -117,6 +117,21 @@ uint8_t epd_get_panel_color(int x, int y, uint8_t r, uint8_t g, uint8_t b) {
     }
 }
 
+uint8_t epd_get_kpanel_color(int x, int y, uint8_t r, uint8_t g, uint8_t b) {
+    uint8_t c = (x + y) % 3;
+    switch (c)
+    {
+      case 0:
+        return gamme_curve[b]; 
+        break;
+      case 1:
+        return gamme_curve[g];
+        break;
+      default:
+        return gamme_curve[r];
+    }
+}
+
 // Pass the x, y and color. It will then let the background under color filter get the right grayscale (WHITE shows color)
 void epd_draw_cpixel(int x, int y, uint8_t r, uint8_t g, uint8_t b, uint8_t *framebuffer) {
   // Check rotation and move pixel around if necessary
@@ -130,6 +145,7 @@ void epd_draw_cpixel(int x, int y, uint8_t r, uint8_t g, uint8_t b, uint8_t *fra
   if (y < 0 || y >= epd_height()) {
     return;
   }
+  // Need to discriminate here display CFA type or in only one get_color function
   uint8_t color = epd_get_panel_color(x, y, r, g, b);
 
   uint8_t *buf_ptr = &framebuffer[y * epd_width() / 2 + x / 2];
diff --git a/src/epdiy.h b/src/epdiy.h
index a83f63e2..1d1ac35c 100644
--- a/src/epdiy.h
+++ b/src/epdiy.h
@@ -310,6 +310,12 @@ void epd_draw_pixel(int x, int y, uint8_t color, uint8_t *framebuffer);
  */
 uint8_t epd_get_panel_color(int x, int y, uint8_t r, uint8_t g, uint8_t b);
 
+/**
+ * @brief What color is on top of Kaleido x & y coordinates. Receives RGB and returns the grayscale for X:Y on that pixel
+ * @return uint8_t 
+ */
+uint8_t epd_get_kpanel_color(int x, int y, uint8_t r, uint8_t g, uint8_t b);
+
 /**
  * @brief This draws a pixel begin aware of what color filter is on top (RGB for DES displays)
  *