254 lines
8.0 KiB
C
254 lines
8.0 KiB
C
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/*******************************************************************************
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* BMP Class
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*
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* Rewrite from: https://github.com/Jaycar-Electronics/Arduino-Picture-Frame.git
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******************************************************************************/
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#ifndef _BMPCLASS_H_
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#define _BMPCLASS_H_
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#include <SD.h>
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typedef void(BMP_DRAW_CALLBACK)(int16_t x, int16_t y, uint16_t *bitmap, int16_t w, int16_t h);
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class BmpClass
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{
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public:
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void draw(
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File *f, BMP_DRAW_CALLBACK *bmpDrawCallback, bool useBigEndian,
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int16_t x, int16_t y, int16_t widthLimit, int16_t heightLimit)
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{
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_bmpDrawCallback = bmpDrawCallback;
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_useBigEndian = useBigEndian;
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_heightLimit = heightLimit;
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int16_t u, v;
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uint32_t xend;
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getbmpparms(f);
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//validate bitmap
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if ((bmtype == 19778) && (bmwidth > 0) && (bmheight > 0) && (bmbpp > 0))
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{
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//centre image
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u = (widthLimit - bmwidth) / 2;
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v = (heightLimit - bmheight) / 2;
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u = (u < 0) ? x : x + u;
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v = (v < 0) ? y : y + v;
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xend = (bmwidth > widthLimit) ? widthLimit : bmwidth;
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bmpRow = (uint16_t *)malloc(xend * 2);
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if (!bmpRow)
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{
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Serial.println(F("bmpRow malloc failed."));
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}
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if (bmbpp < 9)
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{
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bmplt = (uint16_t *)malloc(bmpltsize * 2);
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if (!bmplt)
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{
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Serial.println(F("bmplt malloc failed."));
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}
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bmloadplt(f); //load palette if palettized
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drawbmpal(f, u, v, xend);
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free(bmplt);
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}
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else if (bmbpp == 16)
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{
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// TODO: bpp 16 should have 3 pixel types
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drawbmRgb565(f, u, v, xend);
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}
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else
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{
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drawbmtrue(f, u, v, xend);
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}
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free(bmpRow);
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}
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}
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private:
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void bmloadplt(File *f)
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{
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byte r, g, b;
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if (bmpltsize == 0)
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{
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bmpltsize = 1 << bmbpp; //load default palette size
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}
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f->seek(54); //palette position in type 0x28 bitmaps
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for (int16_t i = 0; i < bmpltsize; i++)
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{
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b = f->read();
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g = f->read();
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r = f->read();
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f->read(); //dummy byte
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bmplt[i] = ((r >> 3) << 11) | ((g >> 2) << 5) | (b >> 3);
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}
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}
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void drawbmpal(File *f, int16_t u, int16_t v, uint32_t xend)
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{
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byte bmbitmask;
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int16_t i, ystart, bmppb, p, d;
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int16_t x, y;
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uint16_t c;
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bmbpl = ((bmbpp * bmwidth + 31) / 32) * 4; //bytes per line
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bmppb = 8 / bmbpp; //pixels/byte
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bmbitmask = ((1 << bmbpp) - 1); //mask for each pixel
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ystart = 0;
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if (bmheight > _heightLimit)
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{
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ystart = bmheight - _heightLimit; //don't draw if it's outside screen
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}
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for (y = ystart; y < bmheight; y++)
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{ //invert in calculation (y=0 is bottom)
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f->seek(bmdataptr + y * bmbpl); //seek to start of line
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x = 0;
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p = 0;
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while (x < xend)
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{
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if (p < 1)
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{
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d = f->read();
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p = bmppb;
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}
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d = d << bmbpp;
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c = bmplt[(bmbitmask & (d >> 8))];
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bmpRow[x] = (_useBigEndian) ? ((c >> 8) | (c << 8)) : c;
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p--;
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x++;
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}
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_bmpDrawCallback(u, v + bmheight - 1 - y, bmpRow, xend, 1);
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}
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}
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// draw 16-bit colour (RGB565) bitmap
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void drawbmRgb565(File *f, int16_t u, int16_t v, uint32_t xend)
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{
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int16_t i, ystart;
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uint32_t x, y;
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byte lo, hi;
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bmbpl = ((bmbpp * bmwidth + 31) / 32) * 4; //bytes per line, due to 32bit chunks
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ystart = 0;
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if (bmheight > _heightLimit)
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{
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ystart = bmheight - _heightLimit; //don't draw if it's outside screen
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}
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Serial.println(xend);
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for (y = ystart; y < bmheight; y++)
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{ //invert in calculation (y=0 is bottom)
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f->seek(bmdataptr + (y * bmbpl)); //seek at start of line
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for (x = 0; x < xend; x++)
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{
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lo = f->read();
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hi = f->read();
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if (_useBigEndian)
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{
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bmpRow[x] = hi | lo << 8;
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}
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else
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{
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bmpRow[x] = lo | hi << 8;
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}
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}
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_bmpDrawCallback(u, v + bmheight - 1 - y, bmpRow, xend, 1);
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}
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}
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// draw true colour bitmap at (u,v) handles 24/32 not 16bpp yet
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void drawbmtrue(File *f, int16_t u, int16_t v, uint32_t xend)
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{
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int16_t i, ystart;
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uint32_t x, y;
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byte r, g, b;
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bmbpl = ((bmbpp * bmwidth + 31) / 32) * 4; //bytes per line, due to 32bit chunks
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ystart = 0;
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if (bmheight > _heightLimit)
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{
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ystart = bmheight - _heightLimit; //don't draw if it's outside screen
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}
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for (y = ystart; y < bmheight; y++)
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{ //invert in calculation (y=0 is bottom)
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f->seek(bmdataptr + y * bmbpl); //seek at start of line
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for (x = 0; x < xend; x++)
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{
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b = f->read();
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g = f->read();
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r = f->read();
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if (bmbpp == 32)
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{
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f->read(); //dummy byte for 32bit
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}
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bmpRow[x] = (_useBigEndian) ? ((r & 0xf8) | (g >> 5) | ((g & 0x1c) << 11) | ((b & 0xf8) << 5)) : (((r & 0xf8) << 8) | ((g & 0xfc) << 3) | (b >> 3));
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}
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_bmpDrawCallback(u, v + bmheight - 1 - y, bmpRow, xend, 1);
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}
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}
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void getbmpparms(File *f)
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{ //load into globals as ints-some parameters are 32 bit, but we can't handle this size anyway
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byte h[48]; //header is 54 bytes typically, but we don't need it all
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int16_t i;
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f->seek(0); //set start of file
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for (i = 0; i < 48; i++)
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{
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h[i] = f->read(); //read header
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}
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bmtype = h[0] + (h[1] << 8); //offset 0 'BM'
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bmdataptr = h[10] + (h[11] << 8); //offset 0xA pointer to image data
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bmhdrsize = h[14] + (h[15] << 8); //dib header size (0x28 is usual)
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//files may vary here, if !=28, unsupported type, put default values
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bmwidth = 0;
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bmheight = 0;
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bmbpp = 0;
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bmpltsize = 0;
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if ((bmhdrsize == 0x28) || (bmhdrsize == 0x38))
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{
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bmwidth = h[18] + (h[19] << 8); //width
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bmheight = h[22] + (h[23] << 8); //height
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bmbpp = h[28] + (h[29] << 8); //bits per pixel
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bmpltsize = h[46] + (h[47] << 8); //palette size
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}
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// Serial.printf("bmtype: %d, bmhdrsize: %d, bmwidth: %d, bmheight: %d, bmbpp: %d\n", bmtype, bmhdrsize, bmwidth, bmheight, bmbpp);
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}
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byte isbmp(char n[])
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{ //check if bmp extension
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int16_t k;
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k = strlen(n);
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if (k < 5)
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{
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return 0; //name not long enough
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}
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if (n[k - 1] != 'P')
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{
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return 0;
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}
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if (n[k - 2] != 'M')
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{
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return 0;
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}
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if (n[k - 3] != 'B')
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{
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return 0;
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}
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if (n[k - 4] != '.')
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{
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return 0;
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}
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return 1; //passes all tests
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}
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BMP_DRAW_CALLBACK *_bmpDrawCallback;
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bool _useBigEndian;
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int16_t _heightLimit;
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uint16_t bmtype, bmdataptr; //from header
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uint32_t bmhdrsize, bmwidth, bmheight, bmbpp, bmpltsize; //from DIB Header
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uint16_t bmbpl; //bytes per line- derived
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uint16_t *bmplt; //palette- stored encoded for LCD
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uint16_t *bmpRow;
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};
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#endif // _BMPCLASS_H_
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