Martin Sturm
/
Lab3
picojpeg/jpegutil.c@0:c546b51ecf0b, 2011-10-11 (annotated)
- Committer:
- XkLi
- Date:
- Tue Oct 11 01:24:18 2011 +0000
- Revision:
- 0:c546b51ecf0b
v1.0
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
XkLi | 0:c546b51ecf0b | 1 | #include "jpegutil.h" |
XkLi | 0:c546b51ecf0b | 2 | |
XkLi | 0:c546b51ecf0b | 3 | FILE *jpegfile; |
XkLi | 0:c546b51ecf0b | 4 | int jpeg_filesize = 0; |
XkLi | 0:c546b51ecf0b | 5 | int jpeg_filepos = 0; |
XkLi | 0:c546b51ecf0b | 6 | |
XkLi | 0:c546b51ecf0b | 7 | unsigned char pjpeg_need_bytes_callback(unsigned char* pBuf, unsigned char buf_size, unsigned char *pBytes_actually_read, void *pCallback_data) |
XkLi | 0:c546b51ecf0b | 8 | { |
XkLi | 0:c546b51ecf0b | 9 | unsigned int n = min((unsigned int)(jpeg_filesize - jpeg_filepos), (unsigned int)buf_size); |
XkLi | 0:c546b51ecf0b | 10 | if (n && (fread(pBuf, 1, n, jpegfile) != n)) |
XkLi | 0:c546b51ecf0b | 11 | return PJPG_STREAM_READ_ERROR; |
XkLi | 0:c546b51ecf0b | 12 | *pBytes_actually_read = (unsigned char)(n); |
XkLi | 0:c546b51ecf0b | 13 | jpeg_filepos += n; |
XkLi | 0:c546b51ecf0b | 14 | return 0; |
XkLi | 0:c546b51ecf0b | 15 | } |
XkLi | 0:c546b51ecf0b | 16 | |
XkLi | 0:c546b51ecf0b | 17 | void ReadJPEGFromFile(const char *filename, NokiaLCD *lcd) |
XkLi | 0:c546b51ecf0b | 18 | { |
XkLi | 0:c546b51ecf0b | 19 | pjpeg_image_info_t imageInfo; |
XkLi | 0:c546b51ecf0b | 20 | jpegfile = fopen(filename,"rb"); |
XkLi | 0:c546b51ecf0b | 21 | fseek(jpegfile, 0, SEEK_END); |
XkLi | 0:c546b51ecf0b | 22 | jpeg_filesize = ftell(jpegfile); |
XkLi | 0:c546b51ecf0b | 23 | jpeg_filepos = 0; |
XkLi | 0:c546b51ecf0b | 24 | fseek(jpegfile, 0, SEEK_SET); |
XkLi | 0:c546b51ecf0b | 25 | int status = pjpeg_decode_init(&imageInfo, pjpeg_need_bytes_callback, NULL); |
XkLi | 0:c546b51ecf0b | 26 | //const unsigned int row_pitch = imageInfo.m_width * imageInfo.m_comps; |
XkLi | 0:c546b51ecf0b | 27 | int mcu_x = 0; |
XkLi | 0:c546b51ecf0b | 28 | int mcu_y = 0; |
XkLi | 0:c546b51ecf0b | 29 | |
XkLi | 0:c546b51ecf0b | 30 | for ( ; ; ) |
XkLi | 0:c546b51ecf0b | 31 | { |
XkLi | 0:c546b51ecf0b | 32 | status = pjpeg_decode_mcu(); |
XkLi | 0:c546b51ecf0b | 33 | |
XkLi | 0:c546b51ecf0b | 34 | if (status) |
XkLi | 0:c546b51ecf0b | 35 | { |
XkLi | 0:c546b51ecf0b | 36 | if (status != PJPG_NO_MORE_BLOCKS) |
XkLi | 0:c546b51ecf0b | 37 | { |
XkLi | 0:c546b51ecf0b | 38 | //pc.printf("pjpeg_decode_mcu() failed with status %u\n", status); |
XkLi | 0:c546b51ecf0b | 39 | fclose(jpegfile); |
XkLi | 0:c546b51ecf0b | 40 | return; |
XkLi | 0:c546b51ecf0b | 41 | } |
XkLi | 0:c546b51ecf0b | 42 | |
XkLi | 0:c546b51ecf0b | 43 | break; |
XkLi | 0:c546b51ecf0b | 44 | } |
XkLi | 0:c546b51ecf0b | 45 | |
XkLi | 0:c546b51ecf0b | 46 | if (mcu_y >= imageInfo.m_MCUSPerCol) |
XkLi | 0:c546b51ecf0b | 47 | { |
XkLi | 0:c546b51ecf0b | 48 | fclose(jpegfile); |
XkLi | 0:c546b51ecf0b | 49 | return; |
XkLi | 0:c546b51ecf0b | 50 | } |
XkLi | 0:c546b51ecf0b | 51 | |
XkLi | 0:c546b51ecf0b | 52 | // Copy MCU's pixel blocks into the destination bitmap. |
XkLi | 0:c546b51ecf0b | 53 | |
XkLi | 0:c546b51ecf0b | 54 | for (int y = 0; y < imageInfo.m_MCUHeight; y += 8) |
XkLi | 0:c546b51ecf0b | 55 | { |
XkLi | 0:c546b51ecf0b | 56 | const int by_limit = min(8, imageInfo.m_height - (mcu_y * imageInfo.m_MCUHeight + y)); |
XkLi | 0:c546b51ecf0b | 57 | for (int x = 0; x < imageInfo.m_MCUWidth; x += 8) |
XkLi | 0:c546b51ecf0b | 58 | { |
XkLi | 0:c546b51ecf0b | 59 | |
XkLi | 0:c546b51ecf0b | 60 | unsigned int src_ofs = (x * 8U) + (y * 16U); |
XkLi | 0:c546b51ecf0b | 61 | const unsigned char *pSrcR = imageInfo.m_pMCUBufR + src_ofs; |
XkLi | 0:c546b51ecf0b | 62 | const unsigned char *pSrcG = imageInfo.m_pMCUBufG + src_ofs; |
XkLi | 0:c546b51ecf0b | 63 | const unsigned char *pSrcB = imageInfo.m_pMCUBufB + src_ofs; |
XkLi | 0:c546b51ecf0b | 64 | |
XkLi | 0:c546b51ecf0b | 65 | const int bx_limit = min(8, imageInfo.m_width - (mcu_x * imageInfo.m_MCUWidth + x)); |
XkLi | 0:c546b51ecf0b | 66 | |
XkLi | 0:c546b51ecf0b | 67 | if (imageInfo.m_scanType == PJPG_GRAYSCALE) |
XkLi | 0:c546b51ecf0b | 68 | { |
XkLi | 0:c546b51ecf0b | 69 | for (int by = 0; by < by_limit; by++) |
XkLi | 0:c546b51ecf0b | 70 | { |
XkLi | 0:c546b51ecf0b | 71 | for (int bx = 0; bx < bx_limit; bx++) |
XkLi | 0:c546b51ecf0b | 72 | { |
XkLi | 0:c546b51ecf0b | 73 | unsigned int color = ((*pSrcR++) << 16); |
XkLi | 0:c546b51ecf0b | 74 | (*lcd).pixel(mcu_x*imageInfo.m_MCUWidth+x+bx,mcu_y*imageInfo.m_MCUHeight+y+by,color); |
XkLi | 0:c546b51ecf0b | 75 | } |
XkLi | 0:c546b51ecf0b | 76 | pSrcR += (8 - bx_limit); |
XkLi | 0:c546b51ecf0b | 77 | } |
XkLi | 0:c546b51ecf0b | 78 | } |
XkLi | 0:c546b51ecf0b | 79 | else |
XkLi | 0:c546b51ecf0b | 80 | { |
XkLi | 0:c546b51ecf0b | 81 | for (int by = 0; by < by_limit; by++) |
XkLi | 0:c546b51ecf0b | 82 | { |
XkLi | 0:c546b51ecf0b | 83 | for (int bx = 0; bx < bx_limit; bx++) |
XkLi | 0:c546b51ecf0b | 84 | { |
XkLi | 0:c546b51ecf0b | 85 | unsigned int color = ((*pSrcR++) << 16) | ((*pSrcG++) << 8) | (*pSrcB++); |
XkLi | 0:c546b51ecf0b | 86 | (*lcd).pixel((130-imageInfo.m_width)/2+mcu_x*imageInfo.m_MCUWidth+x+bx,(130-imageInfo.m_height)/2+mcu_y*imageInfo.m_MCUHeight+y+by,color); |
XkLi | 0:c546b51ecf0b | 87 | } |
XkLi | 0:c546b51ecf0b | 88 | |
XkLi | 0:c546b51ecf0b | 89 | pSrcR += (8 - bx_limit); |
XkLi | 0:c546b51ecf0b | 90 | pSrcG += (8 - bx_limit); |
XkLi | 0:c546b51ecf0b | 91 | pSrcB += (8 - bx_limit); |
XkLi | 0:c546b51ecf0b | 92 | |
XkLi | 0:c546b51ecf0b | 93 | } |
XkLi | 0:c546b51ecf0b | 94 | } |
XkLi | 0:c546b51ecf0b | 95 | } |
XkLi | 0:c546b51ecf0b | 96 | } |
XkLi | 0:c546b51ecf0b | 97 | |
XkLi | 0:c546b51ecf0b | 98 | mcu_x++; |
XkLi | 0:c546b51ecf0b | 99 | if (mcu_x == imageInfo.m_MCUSPerRow) |
XkLi | 0:c546b51ecf0b | 100 | { |
XkLi | 0:c546b51ecf0b | 101 | mcu_x = 0; |
XkLi | 0:c546b51ecf0b | 102 | mcu_y++; |
XkLi | 0:c546b51ecf0b | 103 | } |
XkLi | 0:c546b51ecf0b | 104 | } |
XkLi | 0:c546b51ecf0b | 105 | |
XkLi | 0:c546b51ecf0b | 106 | fclose(jpegfile); |
XkLi | 0:c546b51ecf0b | 107 | } |