Martin Sturm / Mbed 2 deprecated Lab3

Dependencies:   mbed

picojpeg/picojpeg.h@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?

UserRevisionLine numberNew contents of line
XkLi 0:c546b51ecf0b 1 //------------------------------------------------------------------------------
XkLi 0:c546b51ecf0b 2 // picojpeg v1.0 - Public domain, Rich Geldreich <richgel99@gmail.com>
XkLi 0:c546b51ecf0b 3 //------------------------------------------------------------------------------
XkLi 0:c546b51ecf0b 4 #ifndef PICOJPEG_H
XkLi 0:c546b51ecf0b 5 #define PICOJPEG_H
XkLi 0:c546b51ecf0b 6
XkLi 0:c546b51ecf0b 7 #ifdef __cplusplus
XkLi 0:c546b51ecf0b 8 extern "C" {
XkLi 0:c546b51ecf0b 9 #endif
XkLi 0:c546b51ecf0b 10
XkLi 0:c546b51ecf0b 11 // Error codes
XkLi 0:c546b51ecf0b 12 enum
XkLi 0:c546b51ecf0b 13 {
XkLi 0:c546b51ecf0b 14 PJPG_NO_MORE_BLOCKS = 1,
XkLi 0:c546b51ecf0b 15 PJPG_BAD_DHT_COUNTS,
XkLi 0:c546b51ecf0b 16 PJPG_BAD_DHT_INDEX,
XkLi 0:c546b51ecf0b 17 PJPG_BAD_DHT_MARKER,
XkLi 0:c546b51ecf0b 18 PJPG_BAD_DQT_MARKER,
XkLi 0:c546b51ecf0b 19 PJPG_BAD_DQT_TABLE,
XkLi 0:c546b51ecf0b 20 PJPG_BAD_PRECISION,
XkLi 0:c546b51ecf0b 21 PJPG_BAD_HEIGHT,
XkLi 0:c546b51ecf0b 22 PJPG_BAD_WIDTH,
XkLi 0:c546b51ecf0b 23 PJPG_TOO_MANY_COMPONENTS,
XkLi 0:c546b51ecf0b 24 PJPG_BAD_SOF_LENGTH,
XkLi 0:c546b51ecf0b 25 PJPG_BAD_VARIABLE_MARKER,
XkLi 0:c546b51ecf0b 26 PJPG_BAD_DRI_LENGTH,
XkLi 0:c546b51ecf0b 27 PJPG_BAD_SOS_LENGTH,
XkLi 0:c546b51ecf0b 28 PJPG_BAD_SOS_COMP_ID,
XkLi 0:c546b51ecf0b 29 PJPG_W_EXTRA_BYTES_BEFORE_MARKER,
XkLi 0:c546b51ecf0b 30 PJPG_NO_ARITHMITIC_SUPPORT,
XkLi 0:c546b51ecf0b 31 PJPG_UNEXPECTED_MARKER,
XkLi 0:c546b51ecf0b 32 PJPG_NOT_JPEG,
XkLi 0:c546b51ecf0b 33 PJPG_UNSUPPORTED_MARKER,
XkLi 0:c546b51ecf0b 34 PJPG_BAD_DQT_LENGTH,
XkLi 0:c546b51ecf0b 35 PJPG_TOO_MANY_BLOCKS,
XkLi 0:c546b51ecf0b 36 PJPG_UNDEFINED_QUANT_TABLE,
XkLi 0:c546b51ecf0b 37 PJPG_UNDEFINED_HUFF_TABLE,
XkLi 0:c546b51ecf0b 38 PJPG_NOT_SINGLE_SCAN,
XkLi 0:c546b51ecf0b 39 PJPG_UNSUPPORTED_COLORSPACE,
XkLi 0:c546b51ecf0b 40 PJPG_UNSUPPORTED_SAMP_FACTORS,
XkLi 0:c546b51ecf0b 41 PJPG_DECODE_ERROR,
XkLi 0:c546b51ecf0b 42 PJPG_BAD_RESTART_MARKER,
XkLi 0:c546b51ecf0b 43 PJPG_ASSERTION_ERROR,
XkLi 0:c546b51ecf0b 44 PJPG_BAD_SOS_SPECTRAL,
XkLi 0:c546b51ecf0b 45 PJPG_BAD_SOS_SUCCESSIVE,
XkLi 0:c546b51ecf0b 46 PJPG_STREAM_READ_ERROR,
XkLi 0:c546b51ecf0b 47 PJPG_NOTENOUGHMEM,
XkLi 0:c546b51ecf0b 48 PJPG_UNSUPPORTED_COMP_IDENT,
XkLi 0:c546b51ecf0b 49 PJPG_UNSUPPORTED_QUANT_TABLE,
XkLi 0:c546b51ecf0b 50 PJPG_UNSUPPORTED_MODE,
XkLi 0:c546b51ecf0b 51 };
XkLi 0:c546b51ecf0b 52
XkLi 0:c546b51ecf0b 53 // Scan types - currently only GRAYSCALE, YH1V1, and YH2V2 are actually supported.
XkLi 0:c546b51ecf0b 54 typedef enum
XkLi 0:c546b51ecf0b 55 {
XkLi 0:c546b51ecf0b 56 PJPG_GRAYSCALE,
XkLi 0:c546b51ecf0b 57 PJPG_YH1V1,
XkLi 0:c546b51ecf0b 58 PJPG_YH2V1,
XkLi 0:c546b51ecf0b 59 PJPG_YH1V2,
XkLi 0:c546b51ecf0b 60 PJPG_YH2V2
XkLi 0:c546b51ecf0b 61 } pjpeg_scan_type_t;
XkLi 0:c546b51ecf0b 62
XkLi 0:c546b51ecf0b 63 typedef struct
XkLi 0:c546b51ecf0b 64 {
XkLi 0:c546b51ecf0b 65 // Image resolution
XkLi 0:c546b51ecf0b 66 int m_width;
XkLi 0:c546b51ecf0b 67 int m_height;
XkLi 0:c546b51ecf0b 68 // Number of components (1 or 3)
XkLi 0:c546b51ecf0b 69 int m_comps;
XkLi 0:c546b51ecf0b 70 // Total number of minimum coded units (MCU's) per row/col.
XkLi 0:c546b51ecf0b 71 int m_MCUSPerRow;
XkLi 0:c546b51ecf0b 72 int m_MCUSPerCol;
XkLi 0:c546b51ecf0b 73 // Scan type
XkLi 0:c546b51ecf0b 74 pjpeg_scan_type_t m_scanType;
XkLi 0:c546b51ecf0b 75 // MCU width/height in pixels
XkLi 0:c546b51ecf0b 76 int m_MCUWidth;
XkLi 0:c546b51ecf0b 77 int m_MCUHeight;
XkLi 0:c546b51ecf0b 78 // Pointers to internal MCU pixel component buffers.
XkLi 0:c546b51ecf0b 79 // These buffers Will be filled with pixels each time pjpegDecodeMCU() is called successfully.
XkLi 0:c546b51ecf0b 80 // Each MCU consists of (m_MCUWidth/8)*(m_MCUHeight/8) blocks (currently either 1 for greyscale/no subsampling, or 4 for H2V2 sampling factors), where each block is a contiguous array of 64 (8x8) bytes.
XkLi 0:c546b51ecf0b 81 // For greyscale images, only the values in m_pMCUBufR are valid.
XkLi 0:c546b51ecf0b 82 unsigned char *m_pMCUBufR;
XkLi 0:c546b51ecf0b 83 unsigned char *m_pMCUBufG;
XkLi 0:c546b51ecf0b 84 unsigned char *m_pMCUBufB;
XkLi 0:c546b51ecf0b 85 } pjpeg_image_info_t;
XkLi 0:c546b51ecf0b 86
XkLi 0:c546b51ecf0b 87 typedef unsigned char (*pjpeg_need_bytes_callback_t)(unsigned char* pBuf, unsigned char buf_size, unsigned char *pBytes_actually_read, void *pCallback_data);
XkLi 0:c546b51ecf0b 88
XkLi 0:c546b51ecf0b 89 // Initializes the decompressor. Returns 0 on success, or one of the above error codes on failure.
XkLi 0:c546b51ecf0b 90 // pNeed_bytes_callback will be called to fill the decompressor's internal input buffer.
XkLi 0:c546b51ecf0b 91 // Not thread safe.
XkLi 0:c546b51ecf0b 92 unsigned char pjpeg_decode_init(pjpeg_image_info_t *pInfo, pjpeg_need_bytes_callback_t pNeed_bytes_callback, void *pCallback_data);
XkLi 0:c546b51ecf0b 93
XkLi 0:c546b51ecf0b 94 // Decompresses the file's next MCU. Returns 0 on success, PJPG_NO_MORE_BLOCKS if no more blocks are available, or an error code.
XkLi 0:c546b51ecf0b 95 // Must be called a total of m_MCUSPerRow*m_MCUSPerCol times to completely decompress the image.
XkLi 0:c546b51ecf0b 96 unsigned char pjpeg_decode_mcu(void);
XkLi 0:c546b51ecf0b 97
XkLi 0:c546b51ecf0b 98 #ifdef __cplusplus
XkLi 0:c546b51ecf0b 99 }
XkLi 0:c546b51ecf0b 100 #endif
XkLi 0:c546b51ecf0b 101
XkLi 0:c546b51ecf0b 102 #endif // PICOJPEG_H