acid-drop

- Hacking the planet from a LilyGo T-Deck using custom firmware
git clone git://git.acid.vegas/acid-drop.git
Flash_transparent_PNG.ino (2945B)
      1 
      2 // This example renders a png file that is stored in a FLASH array
      3 // using the PNGdec library (available via library manager).
      4 
      5 // The example png is encoded as ARGB 8 bits per pixel with indexed colour
      6 // It was created using GIMP and has a transparent background area.
      7 
      8 // Image files can be converted to arrays using the tool here:
      9 // https://notisrac.github.io/FileToCArray/
     10 // To use this tool:
     11 //   1. Drag and drop PNG image file on "Browse..." button
     12 //   2. Tick box "Treat as binary"
     13 //   3. Click "Convert"
     14 //   4. Click "Save as file" and move the header file to sketch folder
     15 //      (alternatively use the "Copy to clipboard" and paste into a new tab)
     16 //   5. Open the sketch in IDE
     17 //   6. Include the header file containing the array (SpongeBob.h in this example)
     18 
     19 // Include the PNG decoder library, available via the IDE library manager
     20 #include <PNGdec.h>
     21 
     22 // Include image array
     23 #include "SpongeBob.h"
     24 
     25 PNG png; // PNG decoder instance
     26 
     27 #define MAX_IMAGE_WIDTH 240 // Sets rendering line buffer lengths, adjust for your images
     28 
     29 // Include the TFT library - see https://github.com/Bodmer/TFT_eSPI for library information
     30 #include "SPI.h"
     31 #include <TFT_eSPI.h>              // Hardware-specific library
     32 TFT_eSPI tft = TFT_eSPI();         // Invoke custom library
     33 
     34 // Position variables must be global (PNGdec does not handle position coordinates)
     35 int16_t xpos = 0;
     36 int16_t ypos = 0;
     37 
     38 //====================================================================================
     39 //                                    Setup
     40 //====================================================================================
     41 void setup()
     42 {
     43   Serial.begin(115200);
     44   Serial.println("\n\n Using the PNGdec library");
     45 
     46   // Initialise the TFT
     47   tft.begin();
     48   tft.fillScreen(TFT_BLACK);
     49 
     50   Serial.println("\r\nInitialisation done.");
     51 }
     52 
     53 //====================================================================================
     54 //                                    Loop
     55 //====================================================================================
     56 void loop()
     57 {
     58   uint16_t pngw = 0, pngh = 0; // To store width and height of image
     59 
     60   int16_t rc = png.openFLASH((uint8_t *)bob, sizeof(bob), pngDraw);
     61 
     62   if (rc == PNG_SUCCESS) {
     63     Serial.println("Successfully opened png file");
     64     pngw = png.getWidth();
     65     pngh = png.getHeight();
     66     Serial.printf("Image metrics: (%d x %d), %d bpp, pixel type: %d\n", pngw, pngh, png.getBpp(), png.getPixelType());
     67 
     68     tft.startWrite();
     69     uint32_t dt = millis();
     70     rc = png.decode(NULL, 0);
     71     tft.endWrite();
     72     Serial.print(millis() - dt); Serial.println("ms");
     73     tft.endWrite();
     74 
     75     // png.close(); // Required for files, not needed for FLASH arrays
     76   }
     77 
     78   delay(250);
     79 
     80   // Randomly change position
     81   xpos = random(tft.width() - pngw);
     82   ypos = random(tft.height() - pngh);
     83 
     84   // Fill screen with a random colour at random intervals
     85   if (random(100) < 20) tft.fillScreen(random(0x10000));
     86 }