148 lines
4.4 KiB
C++
148 lines
4.4 KiB
C++
#ifndef _GIFDECODER_H_
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#define _GIFDECODER_H_
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#include <stdint.h>
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#include <Arduino.h>
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typedef void (*callback)(void);
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typedef void (*pixel_callback)(int16_t x, int16_t y, uint8_t red, uint8_t green, uint8_t blue);
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typedef void* (*get_buffer_callback)(void);
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typedef bool (*file_seek_callback)(unsigned long position);
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typedef unsigned long (*file_position_callback)(void);
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typedef int (*file_read_callback)(void);
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typedef int (*file_read_block_callback)(void * buffer, int numberOfBytes);
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// LZW constants
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// NOTE: LZW_MAXBITS should be set to 10 or 11 for small displays, 12 for large displays
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// all 32x32-pixel GIFs tested work with 11, most work with 10
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// LZW_MAXBITS = 12 will support all GIFs, but takes 16kB RAM
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#define LZW_SIZTABLE (1 << lzwMaxBits)
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template <int maxGifWidth, int maxGifHeight, int lzwMaxBits>
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class GifDecoder {
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public:
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int startDecoding(void);
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int decodeFrame(void);
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void setScreenClearCallback(callback f);
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void setUpdateScreenCallback(callback f);
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void setDrawPixelCallback(pixel_callback f);
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void setStartDrawingCallback(callback f);
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void setFileSeekCallback(file_seek_callback f);
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void setFilePositionCallback(file_position_callback f);
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void setFileReadCallback(file_read_callback f);
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void setFileReadBlockCallback(file_read_block_callback f);
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private:
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void parseTableBasedImage(void);
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void decompressAndDisplayFrame(unsigned long filePositionAfter);
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int parseData(void);
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int parseGIFFileTerminator(void);
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void parseCommentExtension(void);
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void parseApplicationExtension(void);
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void parseGraphicControlExtension(void);
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void parsePlainTextExtension(void);
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void parseGlobalColorTable(void);
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void parseLogicalScreenDescriptor(void);
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bool parseGifHeader(void);
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void copyImageDataRect(uint8_t *dst, uint8_t *src, int x, int y, int width, int height);
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void fillImageData(uint8_t colorIndex);
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void fillImageDataRect(uint8_t colorIndex, int x, int y, int width, int height);
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int readIntoBuffer(void *buffer, int numberOfBytes);
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int readWord(void);
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void backUpStream(int n);
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int readByte(void);
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void lzw_decode_init(int csize);
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int lzw_decode(uint8_t *buf, int len, uint8_t *bufend);
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void lzw_setTempBuffer(uint8_t * tempBuffer);
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int lzw_get_code(void);
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// Logical screen descriptor attributes
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int lsdWidth;
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int lsdHeight;
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int lsdPackedField;
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int lsdAspectRatio;
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int lsdBackgroundIndex;
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// Table based image attributes
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int tbiImageX;
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int tbiImageY;
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int tbiWidth;
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int tbiHeight;
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int tbiPackedBits;
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bool tbiInterlaced;
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int frameDelay;
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int transparentColorIndex;
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int prevBackgroundIndex;
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int prevDisposalMethod;
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int disposalMethod;
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int lzwCodeSize;
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bool keyFrame;
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int rectX;
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int rectY;
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int rectWidth;
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int rectHeight;
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unsigned long nextFrameTime_ms;
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int colorCount;
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rgb_24 palette[256];
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char tempBuffer[260];
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// Buffer image data is decoded into
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uint8_t imageData[maxGifWidth * maxGifHeight];
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// Backup image data buffer for saving portions of image disposal method == 3
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uint8_t imageDataBU[maxGifWidth * maxGifHeight];
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callback screenClearCallback;
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callback updateScreenCallback;
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pixel_callback drawPixelCallback;
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callback startDrawingCallback;
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file_seek_callback fileSeekCallback;
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file_position_callback filePositionCallback;
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file_read_callback fileReadCallback;
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file_read_block_callback fileReadBlockCallback;
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// LZW variables
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int bbits;
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int bbuf;
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int cursize; // The current code size
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int curmask;
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int codesize;
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int clear_code;
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int end_code;
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int newcodes; // First available code
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int top_slot; // Highest code for current size
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int extra_slot;
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int slot; // Last read code
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int fc, oc;
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int bs; // Current buffer size for GIF
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int bcnt;
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uint8_t *sp;
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uint8_t * temp_buffer;
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uint8_t stack [LZW_SIZTABLE];
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uint8_t suffix [LZW_SIZTABLE];
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uint16_t prefix [LZW_SIZTABLE];
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// Masks for 0 .. 16 bits
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unsigned int mask[17] = {
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0x0000, 0x0001, 0x0003, 0x0007,
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0x000F, 0x001F, 0x003F, 0x007F,
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0x00FF, 0x01FF, 0x03FF, 0x07FF,
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0x0FFF, 0x1FFF, 0x3FFF, 0x7FFF,
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0xFFFF
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};
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};
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#include "GifDecoder_Impl.h"
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#include "LzwDecoder_Impl.h"
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#endif
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