Annotation of parser3/src/classes/gd/gif.h, revision 1.23.2.2
1.1 paf 1: /** @file
1.4 paf 2: Parser: image manipulations decls.
3:
1.23 paf 4: Copyright (c) 2001, 2003 ArtLebedev Group (http://www.artlebedev.com)
1.20 paf 5: Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
1.4 paf 6: based on:
1.1 paf 7: gd.h: declarations file for the gifdraw module.
8:
9: Written by Tom Boutell, 5/94.
10: Copyright 1994, Cold Spring Harbor Labs.
11: Permission granted to use this code in any fashion provided
12: that this notice is retained and any alterations are
13: labeled as such. It is requested, but not required, that
14: you share extensions to this module with us so that we
1.2 paf 15: can incorporate them into new versions.
16: */
1.1 paf 17:
18: #ifndef GIF_H
1.21 paf 19: #define GIF_H
20:
1.23.2.2! paf 21: static const char* IDENT_GIF_H="$Date: 2003/01/29 13:40:30 $";
1.1 paf 22:
1.6 paf 23: #include "pa_config_includes.h"
24:
1.2 paf 25: #include "pa_pool.h"
1.3 paf 26: #include "pa_string.h"
1.2 paf 27:
1.1 paf 28: #define gdMaxColors 0x100
1.2 paf 29: #define HSIZE 5003 /* 80% occupancy */
30:
31: /** Image type.
32: See functions below; you will not need to change
1.1 paf 33: the elements directly. Use the provided macros to
34: access sx, sy, the color table, and colorsTotal for
1.2 paf 35: read-only purposes.
36: */
1.23.2.1 paf 37: class gdImage: public PA_Object {
1.2 paf 38:
1.7 paf 39: public:
40:
41: //@{
42: /// @name Functions to manipulate images
1.2 paf 43: void Create(int asx, int asy);
44: bool CreateFromGif(FILE *fd);
45: void SetPixel(int x, int y, int color);
46: int GetPixel(int x, int y);
47: void Line(int x1, int y1, int x2, int y2, int color);
1.11 parser 48: void StyledLine(int x1, int y1, int x2, int y2, int color, const char *lineStyle);
1.2 paf 49: void Rectangle(int x1, int y1, int x2, int y2, int color);
50: void LineReplaceColor(int x1, int y1, int x2, int y2, int a, int b);
51: void FilledRectangle(int x1, int y1, int x2, int y2, int color);
1.7 paf 52: //@}
1.2 paf 53:
1.7 paf 54: /// Point type for use in polygon drawing.
1.2 paf 55: struct Point {
56: int x, y;
57: };
58:
1.11 parser 59: void Polygon(Point *p, int n, int c, bool closed=true);
1.2 paf 60: void FilledPolygon(Point *p, int n, int c);
61: void FilledPolygonReplaceColor(Point *p, int n, int a, int b);
62:
63: int ColorAllocate(int r, int g, int b);
1.16 parser 64: int ColorClosest(int r, int g, int b, int tolerance=0);
1.2 paf 65: int ColorExact(int r, int g, int b);
66: int ColorRGB(int r, int g, int b);
67: int Color(unsigned int rgb);
68: void ColorDeallocate(int color);
69: void SetColorTransparent(int color);
70:
71: int BoundsSafe(int x, int y);
72: void DoSetPixel(int x, int y, int color);
73:
1.23.2.2! paf 74: void Gif(Pool& pool, String& out);
1.2 paf 75: void Arc(int cx, int cy, int w, int h, int s, int e, int color);
1.15 parser 76: void Sector(int cx, int cy, int w, int h, int s, int e, int color);
1.2 paf 77: void FillToBorder(int x, int y, int border, int color);
78: void Fill(int x, int y, int color);
79: void Copy(gdImage& dst, int dstX, int dstY, int srcX, int srcY, int w, int h);
1.17 parser 80: void CopyResampled(gdImage& dst, int dstX, int dstY, int srcX, int srcY, int dstW, int dstH, int srcW, int srcH, int tolerance);
1.11 parser 81: void SetLineWidth(int width);
82: void SetLineStyle(const char *aLineStyle);
1.2 paf 83: void SetInterlace(int interlaceArg); /* On or off(1 or 0) */
84:
1.7 paf 85: public:
1.2 paf 86:
1.7 paf 87: //@{
88: /// @name information about image. READ ONLY
1.2 paf 89: int SX() { return sx; }
90: int SY() { return sy; }
91: int ColorsTotal() { return colorsTotal; }
92: int Red(int c) { return red[c]; }
93: int Green(int c) { return green[c]; }
94: int Blue(int c) { return blue[c]; }
95: int GetTransparent() { return transparent; }
96: int GetInterlaced() { return interlace; }
1.7 paf 97: //@}
1.2 paf 98:
99: private:
1.1 paf 100:
101: unsigned char ** pixels;
102: int sx;
103: int sy;
104: int colorsTotal;
105: int red[gdMaxColors];
106: int green[gdMaxColors];
107: int blue[gdMaxColors];
108: int open[gdMaxColors];
109: int transparent;
110: int *polyInts;
111: int polyAllocated;
1.11 parser 112: int lineWidth; const char *lineStyle;
1.1 paf 113: int interlace;
114:
1.2 paf 115: private: // read gif
1.1 paf 116:
1.2 paf 117: int GetDataBlock(FILE *fd, unsigned char *buf);
118: int LWZReadByte(FILE *fd, int flag, int input_code_size);
119: void ReadImage(FILE *fd, int len, int height, unsigned char(*cmap)[256], int interlace, int ignore);
120: int DoExtension(FILE *fd, int label, int *Transparent);
121: int GetCode(FILE *fd, int code_size, int flag);
122:
123: private: // read gif
124:
125: int ZeroDataBlock;
126:
127: };
128:
1.23.2.1 paf 129: DECLARE_OBJECT_PTR(gdImage)
130:
1.7 paf 131: /// used by gdImage::Gif to produce buffer with bytes in GIF format
1.23.2.1 paf 132: class gdGifEncoder: public PA_Object {
1.2 paf 133: public:
134:
1.23.2.2! paf 135: gdGifEncoder(Pool& apool, gdImage& aim, String& afp);
1.2 paf 136:
1.3 paf 137: void encode(
1.2 paf 138: int GWidth, int GHeight,
139: int GInterlace, int Background,
140: int Transparent, int BitsPerPixel,
141: int *Red, int *Green, int *Blue);
142:
143: private:
1.23.2.2! paf 144:
! 145: Pool& pool;
1.2 paf 146:
1.7 paf 147: /// a code_int must be able to hold 2**GIFBITS values of type int, and also -1
1.2 paf 148: typedef int code_int;
1.10 parser 149: #ifdef SIGNED_COMPARE_SLOW
1.2 paf 150: typedef unsigned long int count_int;
151: typedef unsigned short int count_short;
1.10 parser 152: #else
1.2 paf 153: typedef long int count_int;
1.10 parser 154: #endif
1.2 paf 155:
156: private:
157:
1.3 paf 158: void Putbyte(int c);
159: void Putword(int w);
160: void Write(void *buf, size_t size);
161:
1.2 paf 162: void prepare_encoder(void);
163: void BumpPixel(void);
164: int GIFNextPixel();
1.3 paf 165: void compress(int init_bits);
1.2 paf 166: void output(code_int code);
167: void cl_block(void);
168: void cl_hash(count_int hsize);
169: void char_init(void);
170: void char_out(int c);
171: void flush_char(void);
172:
173: private:
174:
175: gdImage& im;
1.3 paf 176: String& fp;
1.2 paf 177:
178: int Width, Height;
179: int curx, cury;
180: long CountDown;
181: int Pass;
182: int Interlace;
183:
184: int g_init_bits;
185:
186: int ClearCode;
187: int EOFCode;
188:
189: int n_bits; /* number of bits/code */
190: int maxbits; /* user settable max # bits/code */
191:
192: code_int maxcode; /* maximum code, given n_bits */
193: code_int maxmaxcode; /* should NEVER generate this code */
194:
195: count_int htab [HSIZE];
196: unsigned short codetab [HSIZE];
197: code_int hsize; /* for dynamic table sizing */
198:
199: code_int free_ent; /* first unused entry */
200:
201: /*
202: * block compression parameters -- after all codes are used up,
203: * and compression rate changes, start over.
204: */
205: int clear_flg;
206:
207: int offset;
208: long int in_count; /* length of input */
209: long int out_count; /* # of codes output(for debugging) */
210:
211: unsigned long cur_accum;
212: int cur_bits;
213:
214: /*
215: * Number of characters so far in this 'packet'
216: */
217: int a_count;
218:
219: /*
220: * Define the storage for the packet accumulator
221: */
222: char accum[ 256 ];
223:
224: };
225:
226: inline int gdImage::BoundsSafe(int x, int y){
227: return(!(((y < 0) ||(y >= sy)) ||((x < 0) ||(x >= sx))));
228: }
229:
230: inline /*paf int*/void gdImage::DoSetPixel(int x, int y, int color){
231: if(BoundsSafe(x, y)) pixels[x][y] = color;
232: }
1.23.2.1 paf 233:
234: DECLARE_OBJECT_PTR(gdGifEncoder)
1.1 paf 235:
236: #endif
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