acid-drop

- Hacking the planet from a LilyGo T-Deck using custom firmware
git clone git://git.acid.vegas/acid-drop.git
Flash_PNG.ino (2903B)
      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 // Image files can be converted to arrays using the tool here:
      6 // https://notisrac.github.io/FileToCArray/
      7 // To use this tool:
      8 //   1. Drag and drop file on "Browse..." button
      9 //   2. Tick box "Treat as binary"
     10 //   3. Click "Convert"
     11 //   4. Click "Save as file" and move the header file to sketch folder
     12 //   5. Open the sketch in IDE
     13 //   6. Include the header file containing the array (panda.h in this example)
     14 
     15 // Include the PNG decoder library
     16 #include <PNGdec.h>
     17 #include "panda.h" // Image is stored here in an 8 bit array
     18 
     19 PNG png; // PNG decoder inatance
     20 
     21 #define MAX_IMAGE_WIDTH 240 // Adjust for your images
     22 
     23 int16_t xpos = 0;
     24 int16_t ypos = 0;
     25 
     26 // Include the TFT library https://github.com/Bodmer/TFT_eSPI
     27 #include "SPI.h"
     28 #include <TFT_eSPI.h>              // Hardware-specific library
     29 TFT_eSPI tft = TFT_eSPI();         // Invoke custom library
     30 
     31 //====================================================================================
     32 //                                    Setup
     33 //====================================================================================
     34 void setup()
     35 {
     36   Serial.begin(115200);
     37   Serial.println("\n\n Using the PNGdec library");
     38 
     39   // Initialise the TFT
     40   tft.begin();
     41   tft.fillScreen(TFT_BLACK);
     42 
     43   Serial.println("\r\nInitialisation done.");
     44 }
     45 
     46 //====================================================================================
     47 //                                    Loop
     48 //====================================================================================
     49 void loop()
     50 {
     51   int16_t rc = png.openFLASH((uint8_t *)panda, sizeof(panda), pngDraw);
     52   if (rc == PNG_SUCCESS) {
     53     Serial.println("Successfully opened png file");
     54     Serial.printf("image specs: (%d x %d), %d bpp, pixel type: %d\n", png.getWidth(), png.getHeight(), png.getBpp(), png.getPixelType());
     55     tft.startWrite();
     56     uint32_t dt = millis();
     57     rc = png.decode(NULL, 0);
     58     Serial.print(millis() - dt); Serial.println("ms");
     59     tft.endWrite();
     60     // png.close(); // not needed for memory->memory decode
     61   }
     62   delay(3000);
     63   tft.fillScreen(random(0x10000));
     64 }
     65 
     66 
     67 //=========================================v==========================================
     68 //                                      pngDraw
     69 //====================================================================================
     70 // This next function will be called during decoding of the png file to
     71 // render each image line to the TFT.  If you use a different TFT library
     72 // you will need to adapt this function to suit.
     73 // Callback function to draw pixels to the display
     74 void pngDraw(PNGDRAW *pDraw) {
     75   uint16_t lineBuffer[MAX_IMAGE_WIDTH];
     76   png.getLineAsRGB565(pDraw, lineBuffer, PNG_RGB565_BIG_ENDIAN, 0xffffffff);
     77   tft.pushImage(xpos, ypos + pDraw->y, pDraw->iWidth, 1, lineBuffer);
     78 }