// PNGdec support functions

//=========================================v==========================================
//  pngDraw: Callback function to draw pixels to the display
//====================================================================================
// This function will be called during decoding of the png file to render each image
// line to the TFT. PNGdec generates the image line and a 1bpp mask.
void pngDraw(PNGDRAW *pDraw) {
  uint16_t lineBuffer[MAX_IMAGE_WDITH];          // Line buffer for rendering
  uint8_t  maskBuffer[1 + MAX_IMAGE_WDITH / 8];  // Mask buffer

  png.getLineAsRGB565(pDraw, lineBuffer, PNG_RGB565_BIG_ENDIAN, 0xffffffff);

  if (png.getAlphaMask(pDraw, maskBuffer, 255)) {
    tft.pushMaskedImage(xpos, ypos + pDraw->y, pDraw->iWidth, 1, lineBuffer, maskBuffer);
  }
}