Allow spritesheets for PenRGB565

Author: waffshappen

libraries/pico_graphics/pico_graphics.hpp

@@ -510,6 +510,9 @@ namespace pimoroni {
       int create_pen_hsv(float h, float s, float v) override;
       void set_pixel(const Point &p) override;
       void set_pixel_span(const Point &p, uint l) override;
+
+      void sprite(void* data, const Point &sprite, const Point &dest, const int scale, const int transparent) override;
+
       static size_t buffer_size(uint w, uint h) {
         return w * h * sizeof(RGB565);
       }

libraries/pico_graphics/pico_graphics_pen_rgb565.cpp

@@ -34,4 +34,27 @@ namespace pimoroni {
             *buf++ = color;
         }
     }
-}
+
+
+     void PicoGraphics_PenRGB565::sprite(void* data, const Point &sprite, const Point &dest, const int scale, const int transparent) {
+         //int sprite_x = (sprite & 0x0f) << 3;
+         //int sprite_y = (sprite & 0xf0) >> 1;
+         Point s {
+             sprite.x << 3,
+             sprite.y << 3
+         };
+         RGB565 *ptr = (RGB565 *)data;
+         Point o = {0, 0};
+         for(o.y = 0; o.y < 8 * scale; o.y++) {
+             Point so = {
+                 0,
+                 o.y / scale
+             };
+             for(o.x = 0; o.x < 8 * scale; o.x++) {
+                 so.x = o.x / scale;
+                 color = ptr[(s.y + so.y) * 128 + (s.x + so.x)];
+                 if(color != transparent) pixel(dest + o);
+             }
+         }
+     }
+}

micropython/modules/picographics/README.md

@@ -510,6 +510,8 @@ Sprites must be 8x8 pixels arranged in a 128x128 pixel spritesheet. 1-bit transp
 
 We've prepared some RGB332-compatible sprite assets for you, but you can use `spritesheet-to-rgb332.py <filename>` to convert your own.
 
+For higher quality you can use RGB565 Spritesheets on some devices, like the Tufty2040, but try using a lower spritesheet resolution of up to 128x96 pixels to not exceed device memory.
+
 #### Loading Sprites
 
 You'll need to include the [pen_type](#supported-graphics-modes-pen-type) in the import statement, and define the pen_type before using loading the spritesheet: