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lib/TJpg_Decoder/src/TJpg_Decoder.cpp

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+/*
+TJpg_Decoder.cpp
+
+Created by Bodmer 18/10/19
+Modified by Blueforcer 02/23
+
+Latest version here:
+https://github.com/Bodmer/TJpg_Decoder
+*/
+
+#include "TJpg_Decoder.h"
+
+// Create a class instance to be used by the sketch (defined as extern in header)
+TJpg_Decoder TJpgDec;
+
+/***************************************************************************************
+** Function name:           TJpg_Decoder
+** Description:             Constructor
+***************************************************************************************/
+TJpg_Decoder::TJpg_Decoder()
+{
+  // Setup a pointer to this class for static functions
+  thisPtr = this;
+}
+
+/***************************************************************************************
+** Function name:           ~TJpg_Decoder
+** Description:             Destructor
+***************************************************************************************/
+TJpg_Decoder::~TJpg_Decoder()
+{
+  // Bye
+}
+
+/***************************************************************************************
+** Function name:           setJpgScale
+** Description:             Set the reduction scale factor (1, 2, 4 or 8)
+***************************************************************************************/
+void TJpg_Decoder::setSwapBytes(bool swapBytes)
+{
+  _swap = swapBytes;
+}
+
+/***************************************************************************************
+** Function name:           setJpgScale
+** Description:             Set the reduction scale factor (1, 2, 4 or 8)
+***************************************************************************************/
+void TJpg_Decoder::setJpgScale(uint8_t scaleFactor)
+{
+  switch (scaleFactor)
+  {
+  case 1:
+    jpgScale = 0;
+    break;
+  case 2:
+    jpgScale = 1;
+    break;
+  case 4:
+    jpgScale = 2;
+    break;
+  case 8:
+    jpgScale = 3;
+    break;
+  default:
+    jpgScale = 0;
+  }
+}
+
+/***************************************************************************************
+** Function name:           setCallback
+** Description:             Set the sketch callback function to render decoded blocks
+***************************************************************************************/
+void TJpg_Decoder::setCallback(SketchCallback sketchCallback)
+{
+  tft_output = sketchCallback;
+}
+
+/***************************************************************************************
+** Function name:           jd_input (declared static)
+** Description:             Called by tjpgd.c to get more data
+***************************************************************************************/
+unsigned int TJpg_Decoder::jd_input(JDEC *jdec, uint8_t *buf, unsigned int len)
+{
+  TJpg_Decoder *thisPtr = TJpgDec.thisPtr;
+  jdec = jdec; // Supress warning
+
+  // Handle an array input
+  if (thisPtr->jpg_source == TJPG_ARRAY)
+  {
+    // Avoid running off end of array
+    if (thisPtr->array_index + len > thisPtr->array_size)
+    {
+      len = thisPtr->array_size - thisPtr->array_index;
+    }
+
+    // If buf is valid then copy len bytes to buffer
+    if (buf)
+      memcpy_P(buf, (const uint8_t *)(thisPtr->array_data + thisPtr->array_index), len);
+
+    // Move pointer
+    thisPtr->array_index += len;
+  }
+
+#ifdef TJPGD_LOAD_FFS
+  // Handle SPIFFS input
+  else if (thisPtr->jpg_source == TJPG_FS_FILE)
+  {
+    // Check how many bytes are available
+    uint32_t bytesLeft = thisPtr->jpgFile.available();
+    if (bytesLeft < len)
+      len = bytesLeft;
+
+    if (buf)
+    {
+      // Read into buffer, pointer moved as well
+      thisPtr->jpgFile.read(buf, len);
+    }
+    else
+    {
+      // Buffer is null, so skip data by moving pointer
+      thisPtr->jpgFile.seek(thisPtr->jpgFile.position() + len);
+    }
+  }
+#endif
+
+#if defined(TJPGD_LOAD_SD_LIBRARY)
+  // Handle SD library input
+  else if (thisPtr->jpg_source == TJPG_SD_FILE)
+  {
+    // Check how many bytes are available
+    uint32_t bytesLeft = thisPtr->jpgSdFile.available();
+    if (bytesLeft < len)
+      len = bytesLeft;
+
+    if (buf)
+    {
+      // Read into buffer, pointer moved as well
+      thisPtr->jpgSdFile.read(buf, len);
+    }
+    else
+    {
+      // Buffer is null, so skip data by moving pointer
+      thisPtr->jpgSdFile.seek(thisPtr->jpgSdFile.position() + len);
+    }
+  }
+#endif
+
+  return len;
+}
+
+/***************************************************************************************
+** Function name:           jd_output (declared static)
+** Description:             Called by tjpgd.c with an image block for rendering
+***************************************************************************************/
+// Pass image block back to the sketch for rendering, may be a complete or partial MCU
+int TJpg_Decoder::jd_output(JDEC *jdec, void *bitmap, JRECT *jrect)
+{
+
+  TJpg_Decoder *thisPtr = TJpgDec.thisPtr;
+  jdec = jdec; // Supress warning as ID is not used
+
+  int16_t x = jrect->left + thisPtr->jpeg_x;
+  int16_t y = jrect->top + thisPtr->jpeg_y;
+  uint16_t w = jrect->right + 1 - jrect->left;
+  uint16_t h = jrect->bottom + 1 - jrect->top;
+  // Pass the image block and rendering parameters in a callback to the sketch
+  return thisPtr->tft_output(x, y, w, h, (uint16_t *)bitmap);
+}
+
+/***************************************************************************************
+** Function name:           drawFsJpg für AWTRIX
+** Description:             Draw a jpg with opened file handle at x,y
+***************************************************************************************/
+JRESULT TJpg_Decoder::drawFsJpg(int32_t x, int32_t y, fs::File inFile)
+{
+
+  JDEC jdec;
+  JRESULT jresult = JDR_OK;
+
+  jpg_source = TJPG_FS_FILE;
+  jpeg_x = x;
+  jpeg_y = y;
+
+  jdec.swap = _swap;
+
+  jpgFile = inFile;
+
+  jresult = jd_prepare(&jdec, jd_input, workspace, TJPGD_WORKSPACE_SIZE, (unsigned int)0);
+
+  // Extract image and render
+  if (jresult == JDR_OK)
+  {
+    jresult = jd_decomp(&jdec, jd_output, jpgScale);
+  }
+  inFile.seek(0);
+  return jresult;
+}