107 lines
2.8 KiB
C
107 lines
2.8 KiB
C
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/*******************************************************************************
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* JPEGDEC related function
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*
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* Dependent libraries:
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* JPEGDEC: https://github.com/bitbank2/JPEGDEC.git
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******************************************************************************/
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#ifndef _JPEGFUNC_H_
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#define _JPEGFUNC_H_
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#include <JPEGDEC.h>
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static JPEGDEC _jpeg;
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static File _f;
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static int _x, _y, _x_bound, _y_bound;
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static void *jpegOpenFile(const char *szFilename, int32_t *pFileSize)
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{
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// Serial.println("jpegOpenFile");
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#if defined(ARDUINO_ARCH_SAMD) && defined(SEEED_GROVE_UI_WIRELESS)
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_f = SD.open(szFilename, "r");
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#elif defined(TARGET_RP2040)
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_f = LittleFS.open(szFilename, "r");
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// _f = SDFS.open(szFilename, "r");
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#elif defined(ESP32)
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// _f = FFat.open(szFilename, "r");
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_f = LittleFS.open(szFilename, "r");
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// _f = SPIFFS.open(szFilename, "r");
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// _f = SD.open(szFilename, "r");
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// _f = SD_MMC.open(szFilename, "r");
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#elif defined(ESP8266)
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_f = LittleFS.open(szFilename, "r");
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// _f = SD.open(szFilename, "r");
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#else
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_f = SD.open(szFilename, FILE_READ);
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#endif
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*pFileSize = _f.size();
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return &_f;
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}
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static void jpegCloseFile(void *pHandle)
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{
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// Serial.println("jpegCloseFile");
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File *f = static_cast<File *>(pHandle);
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f->close();
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}
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static int32_t jpegReadFile(JPEGFILE *pFile, uint8_t *pBuf, int32_t iLen)
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{
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// Serial.printf("jpegReadFile, iLen: %d\n", iLen);
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File *f = static_cast<File *>(pFile->fHandle);
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size_t r = f->read(pBuf, iLen);
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return r;
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}
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static int32_t jpegSeekFile(JPEGFILE *pFile, int32_t iPosition)
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{
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// Serial.printf("jpegSeekFile, pFile->iPos: %d, iPosition: %d\n", pFile->iPos, iPosition);
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File *f = static_cast<File *>(pFile->fHandle);
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f->seek(iPosition);
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return iPosition;
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}
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static void jpegDraw(
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const char *filename, JPEG_DRAW_CALLBACK *jpegDrawCallback, bool useBigEndian,
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int x, int y, int widthLimit, int heightLimit)
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{
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_x = x;
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_y = y;
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_x_bound = _x + widthLimit - 1;
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_y_bound = _y + heightLimit - 1;
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_jpeg.open(filename, jpegOpenFile, jpegCloseFile, jpegReadFile, jpegSeekFile, jpegDrawCallback);
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// scale to fit height
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int _scale;
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int iMaxMCUs;
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float ratio = (float)_jpeg.getHeight() / heightLimit;
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if (ratio <= 1)
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{
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_scale = 0;
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iMaxMCUs = widthLimit / 16;
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}
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else if (ratio <= 2)
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{
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_scale = JPEG_SCALE_HALF;
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iMaxMCUs = widthLimit / 8;
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}
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else if (ratio <= 4)
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{
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_scale = JPEG_SCALE_QUARTER;
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iMaxMCUs = widthLimit / 4;
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}
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else
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{
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_scale = JPEG_SCALE_EIGHTH;
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iMaxMCUs = widthLimit / 2;
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}
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_jpeg.setMaxOutputSize(iMaxMCUs);
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if (useBigEndian)
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{
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_jpeg.setPixelType(RGB565_BIG_ENDIAN);
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}
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_jpeg.decode(x, y, _scale);
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_jpeg.close();
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}
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#endif // _JPEGFUNC_H_
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