3 Bitmap functions (needs libjpeg)
5 Extension module for the rfxswf library.
6 Part of the swftools package.
8 Copyright (c) 2000, 2001 Rainer Böhme <rfxswf@reflex-studio.de>
10 This file is distributed under the GPL, see file COPYING for details
14 #define OUTBUFFER_SIZE 0x8000
16 #ifdef _JPEGLIB_INCLUDED_
18 typedef struct _JPEGDESTMGR
19 { struct jpeg_destination_mgr mgr;
22 struct jpeg_compress_struct cinfo;
23 struct jpeg_error_mgr jerr;
24 } JPEGDESTMGR, * LPJPEGDESTMGR;
26 // Destination manager callbacks
28 void RFXSWF_init_destination(j_compress_ptr cinfo)
29 { JPEGDESTMGR * dmgr = (JPEGDESTMGR *)cinfo->dest;
30 dmgr->buffer = (JOCTET*)malloc(OUTBUFFER_SIZE);
31 dmgr->mgr.next_output_byte = dmgr->buffer;
32 dmgr->mgr.free_in_buffer = OUTBUFFER_SIZE;
35 boolean RFXSWF_empty_output_buffer(j_compress_ptr cinfo)
36 { JPEGDESTMGR * dmgr = (JPEGDESTMGR *)cinfo->dest;
37 swf_SetBlock(dmgr->t,(U8*)dmgr->buffer,OUTBUFFER_SIZE);
38 dmgr->mgr.next_output_byte = dmgr->buffer;
39 dmgr->mgr.free_in_buffer = OUTBUFFER_SIZE;
43 void RFXSWF_term_destination(j_compress_ptr cinfo)
44 { JPEGDESTMGR * dmgr = (JPEGDESTMGR *)cinfo->dest;
45 swf_SetBlock(dmgr->t,(U8*)dmgr->buffer,OUTBUFFER_SIZE-dmgr->mgr.free_in_buffer);
47 dmgr->mgr.free_in_buffer = 0;
50 JPEGBITS * swf_SetJPEGBitsStart(TAG * t,int width,int height,int quality)
54 // redirect compression lib output to local SWF Tag structure
56 jpeg = (JPEGDESTMGR *)malloc(sizeof(JPEGDESTMGR));
57 if (!jpeg) return NULL;
59 memset(jpeg,0x00,sizeof(JPEGDESTMGR));
60 jpeg->cinfo.err = jpeg_std_error(&jpeg->jerr);
62 jpeg_create_compress(&jpeg->cinfo);
64 jpeg->mgr.init_destination = RFXSWF_init_destination;
65 jpeg->mgr.empty_output_buffer = RFXSWF_empty_output_buffer;
66 jpeg->mgr.term_destination = RFXSWF_term_destination;
70 jpeg->cinfo.dest = (struct jpeg_destination_mgr *)jpeg;
74 jpeg->cinfo.image_width = width;
75 jpeg->cinfo.image_height = height;
76 jpeg->cinfo.input_components = 3;
77 jpeg->cinfo.in_color_space = JCS_RGB;
79 jpeg_set_defaults(&jpeg->cinfo);
80 jpeg_set_quality(&jpeg->cinfo,quality,TRUE);
82 // write tables to SWF
84 jpeg_write_tables(&jpeg->cinfo);
86 // compess image to SWF
88 jpeg_suppress_tables(&jpeg->cinfo, TRUE);
89 jpeg_start_compress(&jpeg->cinfo, FALSE);
91 return (JPEGBITS *)jpeg;
94 int swf_SetJPEGBitsLines(JPEGBITS * jpegbits,U8 ** data,int n)
95 { JPEGDESTMGR * jpeg = (JPEGDESTMGR *)jpegbits;
97 jpeg_write_scanlines(&jpeg->cinfo,data,n);
101 int swf_SetJPEGBitsLine(JPEGBITS * jpegbits,U8 * data)
102 { return swf_SetJPEGBitsLines(jpegbits,&data,1);
105 int swf_SetJPEGBitsFinish(JPEGBITS * jpegbits)
106 { JPEGDESTMGR * jpeg = (JPEGDESTMGR *)jpegbits;
107 if (!jpeg) return -1;
108 jpeg_finish_compress(&jpeg->cinfo);
113 int swf_SetJPEGBits(TAG * t,char * fname,int quality)
114 { struct jpeg_decompress_struct cinfo;
115 struct jpeg_error_mgr jerr;
120 cinfo.err = jpeg_std_error(&jerr);
121 jpeg_create_decompress(&cinfo);
123 if ((f=fopen(fname,"rb"))==NULL) return -1;
125 jpeg_stdio_src(&cinfo,f);
126 jpeg_read_header(&cinfo, TRUE);
127 cinfo.out_color_space = JCS_RGB; //automatically convert grayscale images
128 jpeg_start_decompress(&cinfo);
130 out = swf_SetJPEGBitsStart(t,cinfo.output_width,cinfo.output_height,quality);
131 scanline = (U8*)malloc(4*cinfo.output_width);
136 for (y=0;y<cinfo.output_height;y++)
137 { jpeg_read_scanlines(&cinfo,&js,1);
138 swf_SetJPEGBitsLines(out,(U8**)&js,1);
142 swf_SetJPEGBitsFinish(out);
143 jpeg_finish_decompress(&cinfo);
149 #endif // _JPEGLIB_INCLUDED_
151 // Lossless compression texture based on zlib
153 #ifdef _ZLIB_INCLUDED_
155 int RFXSWF_deflate_wraper(TAG * t,z_stream * zs,U8 * data,boolean finish)
157 { int status = deflate(zs,Z_SYNC_FLUSH);
159 if (zs->avail_out == 0)
160 { swf_SetBlock(t,data,zs->next_out-data);
162 zs->avail_out = OUTBUFFER_SIZE;
166 { if (finish) deflate(zs,Z_FINISH);
173 fprintf(stderr,"rfxswf: zlib compression error (%i)\n",status);
181 int swf_SetLosslessBits(TAG * t,U16 width,U16 height,void * bitmap,U8 bitmap_flags)
186 switch (bitmap_flags)
188 return swf_SetLosslessBitsIndexed(t,width,height,bitmap,NULL,256);
190 bps = BYTES_PER_SCANLINE(sizeof(U16)*width);
199 swf_SetU8(t,bitmap_flags);
201 swf_SetU16(t,height);
203 if (data=malloc(OUTBUFFER_SIZE))
206 memset(&zs,0x00,sizeof(z_stream));
210 if (deflateInit(&zs,Z_DEFAULT_COMPRESSION)==Z_OK)
211 { zs.avail_in = bps*height;
214 zs.avail_out = OUTBUFFER_SIZE;
216 if (RFXSWF_deflate_wraper(t,&zs,data,TRUE)<0) res = -3;
217 if (zs.next_out>data) swf_SetBlock(t,data,zs.next_out-data);
222 } else res = -3; // zlib error
224 } else res = -2; // memory error
229 int swf_SetLosslessBitsIndexed(TAG * t,U16 width,U16 height,U8 * bitmap,RGBA * palette,U16 ncolors)
230 { RGBA * pal = palette;
231 int bps = BYTES_PER_SCANLINE(width);
235 if (!pal) // create default palette for grayscale images
237 pal = malloc(256*sizeof(RGBA));
238 for (i=0;i<256;i++) { pal[i].r = pal[i].g = pal[i].b = i; pal[i].a = 0xff;}
242 if ((ncolors<2)||(ncolors>256)||(!t)) return -1; // parameter error
244 swf_SetU8(t,BMF_8BIT);
246 swf_SetU16(t,height);
247 swf_SetU8(t,ncolors-1); // number of pal entries
249 if (data=malloc(OUTBUFFER_SIZE))
252 memset(&zs,0x00,sizeof(z_stream));
256 if (deflateInit(&zs,Z_DEFAULT_COMPRESSION)==Z_OK)
257 { U8 * zpal; // compress palette
258 if (zpal = malloc(ncolors*4))
262 /* be careful with ST_DEFINEBITSLOSSLESS2, because
263 the Flash player produces great bugs if you use too many
264 alpha colors in your palette. The only sensible result that
265 can be archeived is setting one color to r=0,b=0,g=0,a=0 to
266 make transparent parts in sprites. That's the cause why alpha
267 handling is implemented in lossless routines of rfxswf.
269 Indeed: I haven't understood yet how flash player handles
270 alpha values different from 0 and 0xff in lossless bitmaps...
273 if (swf_GetTagID(t)==ST_DEFINEBITSLOSSLESS2) // have alpha channel?
274 { for (i=0;i<ncolors;i++)
281 zs.avail_in = 4*ncolors;
284 { for (i=0;i<ncolors;i++) // pack RGBA structures to RGB
290 zs.avail_in = 3*ncolors;
295 zs.avail_out = OUTBUFFER_SIZE;
297 if (RFXSWF_deflate_wraper(t,&zs,data,FALSE)<0) res = -3;
301 zs.avail_in = (bps*height*sizeof(U8));
303 if (RFXSWF_deflate_wraper(t,&zs,data,TRUE)<0) res = -3;
307 if (zs.next_out>data) swf_SetBlock(t,data,zs.next_out-data);
310 } else res = -2; // memory error
311 } else res = -3; // zlib error
315 if (!palette) free(pal);
320 int swf_SetLosslessBitsGrayscale(TAG * t,U16 width,U16 height,U8 * bitmap)
321 { return swf_SetLosslessBitsIndexed(t,width,height,bitmap,NULL,256);
325 #endif // _ZLIB_INCLUDED_
327 #undef OUTBUFFER_SIZE