79 lines
2.8 KiB
C++
79 lines
2.8 KiB
C++
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// This example renders a png file that is stored in a FLASH array
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// using the PNGdec library (available via library manager).
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// Image files can be converted to arrays using the tool here:
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// https://notisrac.github.io/FileToCArray/
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// To use this tool:
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// 1. Drag and drop file on "Browse..." button
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// 2. Tick box "Treat as binary"
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// 3. Click "Convert"
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// 4. Click "Save as file" and move the header file to sketch folder
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// 5. Open the sketch in IDE
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// 6. Include the header file containing the array (panda.h in this example)
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// Include the PNG decoder library
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#include <PNGdec.h>
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#include "panda.h" // Image is stored here in an 8 bit array
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PNG png; // PNG decoder inatance
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#define MAX_IMAGE_WDITH 240 // Adjust for your images
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int16_t xpos = 0;
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int16_t ypos = 0;
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// Include the TFT library https://github.com/Bodmer/TFT_eSPI
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#include "SPI.h"
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#include <TFT_eSPI.h> // Hardware-specific library
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TFT_eSPI tft = TFT_eSPI(); // Invoke custom library
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//====================================================================================
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// Setup
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//====================================================================================
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void setup()
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{
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Serial.begin(115200);
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Serial.println("\n\n Using the PNGdec library");
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// Initialise the TFT
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tft.begin();
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tft.fillScreen(TFT_BLACK);
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Serial.println("\r\nInitialisation done.");
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}
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//====================================================================================
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// Loop
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//====================================================================================
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void loop()
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{
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int16_t rc = png.openFLASH((uint8_t *)panda, sizeof(panda), pngDraw);
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if (rc == PNG_SUCCESS) {
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Serial.println("Successfully png file");
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Serial.printf("image specs: (%d x %d), %d bpp, pixel type: %d\n", png.getWidth(), png.getHeight(), png.getBpp(), png.getPixelType());
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tft.startWrite();
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uint32_t dt = millis();
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rc = png.decode(NULL, 0);
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Serial.print(millis() - dt); Serial.println("ms");
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tft.endWrite();
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// png.close(); // not needed for memory->memory decode
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}
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delay(3000);
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tft.fillScreen(random(0x10000));
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}
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//=========================================v==========================================
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// pngDraw
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//====================================================================================
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// This next function will be called during decoding of the png file to
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// render each image line to the TFT. If you use a different TFT library
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// you will need to adapt this function to suit.
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// Callback function to draw pixels to the display
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void pngDraw(PNGDRAW *pDraw) {
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uint16_t lineBuffer[MAX_IMAGE_WDITH];
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png.getLineAsRGB565(pDraw, lineBuffer, PNG_RGB565_BIG_ENDIAN, 0xffffffff);
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tft.pushImage(xpos, ypos + pDraw->y, pDraw->iWidth, 1, lineBuffer);
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}
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