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// Code copied from AnimatedGIF examples
#ifndef M5STACK_SD
// for custom ESP32 builds
#define M5STACK_SD SD
#endif
static void * GIFOpenFile(const char *fname, int32_t *pSize)
{
//log_d("GIFOpenFile( %s )\n", fname );
FSGifFile = M5STACK_SD.open(fname);
if (FSGifFile) {
*pSize = FSGifFile.size();
return (void *)&FSGifFile;
}
return NULL;
}
static void GIFCloseFile(void *pHandle)
{
File *f = static_cast<File *>(pHandle);
if (f != NULL)
f->close();
}
static int32_t GIFReadFile(GIFFILE *pFile, uint8_t *pBuf, int32_t iLen)
{
int32_t iBytesRead;
iBytesRead = iLen;
File *f = static_cast<File *>(pFile->fHandle);
// Note: If you read a file all the way to the last byte, seek() stops working
if ((pFile->iSize - pFile->iPos) < iLen)
iBytesRead = pFile->iSize - pFile->iPos - 1; // <-- ugly work-around
if (iBytesRead <= 0)
return 0;
iBytesRead = (int32_t)f->read(pBuf, iBytesRead);
pFile->iPos = f->position();
return iBytesRead;
}
static int32_t GIFSeekFile(GIFFILE *pFile, int32_t iPosition)
{
int i = micros();
File *f = static_cast<File *>(pFile->fHandle);
f->seek(iPosition);
pFile->iPos = (int32_t)f->position();
i = micros() - i;
//log_d("Seek time = %d us\n", i);
return pFile->iPos;
}
// Draw a line of image directly on the LCD
void GIFDraw(GIFDRAW *pDraw)
{
uint8_t *s;
uint16_t *d, *usPalette, usTemp[320];
int x, y, iWidth;
iWidth = pDraw->iWidth;
if (iWidth > PANEL_RES_X)
iWidth = PANEL_RES_X;
usPalette = pDraw->pPalette;
y = pDraw->iY + pDraw->y; // current line
s = pDraw->pPixels;
if (pDraw->ucDisposalMethod == 2) {// restore to background color
for (x=0; x<iWidth; x++) {
if (s[x] == pDraw->ucTransparent)
s[x] = pDraw->ucBackground;
}
pDraw->ucHasTransparency = 0;
}
// Apply the new pixels to the main image
if (pDraw->ucHasTransparency) { // if transparency used
uint8_t *pEnd, c, ucTransparent = pDraw->ucTransparent;
int x, iCount;
pEnd = s + iWidth;
x = 0;
iCount = 0; // count non-transparent pixels
while(x < iWidth) {
c = ucTransparent-1;
d = usTemp;
while (c != ucTransparent && s < pEnd) {
c = *s++;
if (c == ucTransparent) { // done, stop
s--; // back up to treat it like transparent
} else { // opaque
*d++ = usPalette[c];
iCount++;
}
} // while looking for opaque pixels
if (iCount) { // any opaque pixels?
for(int xOffset = 0; xOffset < iCount; xOffset++ ){
dma_display->drawPixel(x + xOffset, y, usTemp[xOffset]); // 565 Color Format
}
x += iCount;
iCount = 0;
}
// no, look for a run of transparent pixels
c = ucTransparent;
while (c == ucTransparent && s < pEnd) {
c = *s++;
if (c == ucTransparent)
iCount++;
else
s--;
}
if (iCount) {
x += iCount; // skip these
iCount = 0;
}
}
} else {
s = pDraw->pPixels;
// Translate the 8-bit pixels through the RGB565 palette (already byte reversed)
for (x=0; x<iWidth; x++)
dma_display->drawPixel(x, y, usPalette[*s++]); // color 565
/*
usTemp[x] = usPalette[*s++];
for (x=0; x<pDraw->iWidth; x++) {
dma_display->drawPixel(x, y, usTemp[*s++]); // color 565
} */
}
} /* GIFDraw() */
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