firmware: png decode demo

firmware/.gitignore

@@ -3,3 +3,4 @@
 .vscode/c_cpp_properties.json
 .vscode/launch.json
 .vscode/ipch
+src/gfx_png.h

firmware/scripts/gfx_convert.py

@@ -22,8 +22,6 @@ def to_code(name, path):
     img = Image.open(path)
     img = img.convert("1", dither=Image.Dither.FLOYDSTEINBERG)
     w, h = img.size
-    colors = img.getcolors()
-    print(colors)
 
     code = f"uint32_t gfx_{name}[{h}] = {'{'}\n"
 
@@ -37,7 +35,7 @@ def to_code(name, path):
     code += "};\n\n"
     return code
 
-if __name__ == "__main__":
+def generate_gfx():
     gfx = get_all_gfx()
     gfx_code = ''.join(to_code(name, path) for name, path in gfx)
 
@@ -55,3 +53,38 @@ if __name__ == "__main__":
         f.write(index)
 
     print("gfx.h generated!")
+
+def png_to_code(name, path):
+    file = open(path, "rb")
+    data = file.read()
+    size = len(data)
+
+    code = f"uint8_t png_{name}[{size}] = {'{'}"
+    for i in range(size):
+        code += f"0x{data[i]:02x},"
+    code += "};\n\n"
+    return code
+
+def generate_png_gfx():
+    gfx = get_all_gfx()
+    gfx_code = ''.join(png_to_code(name, path) for name, path in gfx)
+
+    header = f"#pragma once\n#include <Arduino.h>\n\n/* DO NOT MODIFY - AUTOGENERATED! */\n\n"
+
+    index = f"uint8_t* png_frames[{len(gfx)}] = {'{'}\n"
+    for name, _ in gfx:
+        index += f"  png_{name},\n"
+    index += "};\n"
+
+    with open("src/gfx_png.h", "w") as f:
+        f.write(header)
+        f.write("#define PNG_COUNT " + str(len(gfx)) + "\n\n")
+        f.write(gfx_code)
+        f.write(index)
+
+    print("gfx_png.h generated!")
+
+
+if __name__ == "__main__":
+    generate_gfx()
+    generate_png_gfx()

firmware/src/main.cpp

@@ -1,5 +1,7 @@
 #include <Arduino.h>
 #include "gfx.h"
+#include "gfx_png.h"
+#include "lodepng.h"
 
 #define COL_SER 0
 #define COL_OE 26
@@ -102,6 +104,22 @@ void setup() {
   // clear frames
   frameIndex = 0;
   frameLastChangedAt = millis();
+
+  delay(1500);
+
+  Serial.println("Decoding PNG...");
+
+  auto b4 = millis();
+  unsigned char *buffer = 0;
+  unsigned width, height;
+  lodepng_decode_memory(&buffer, &width, &height, png_badapple_001, sizeof(png_badapple_001), LCT_GREY, 8);
+
+  Serial.print("Decoded in ");
+  Serial.print(millis() - b4);
+  Serial.println("ms");
+
+  Serial.println(width);
+  Serial.println(height);
 }
 
 void loop() {