888 lines
31 KiB
C++
888 lines
31 KiB
C++
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/* based on APNG Disassembler 2.3
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*
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* Copyright (c) 2009 Max Stepin
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* maxst at users.sourceforge.net
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*
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* GNU LGPL information
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* --------------------
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <memory.h>
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#include <zlib.h>
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#include "apngloader.h"
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// hack to create a portable fmemopen
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FILE *fmemopen (void *buf, size_t size, const char *opentype)
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{
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FILE *f;
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f = tmpfile();
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fwrite(buf, 1, size, f);
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rewind(f);
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return f;
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}
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#if defined(_MSC_VER) && _MSC_VER >= 1300
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#define swap16(data) _byteswap_ushort(data)
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#define swap32(data) _byteswap_ulong(data)
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#elif __linux__
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#include <byteswap.h>
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#define swap16(data) bswap_16(data)
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#define swap32(data) bswap_32(data)
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#else
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#define swap16(data) (((data >> 8) & 255) | ((data & 255) << 8))
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#define swap32(data) ((swap16(data) << 16) | swap16(data >> 16))
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#endif
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#define PNG_ZBUF_SIZE 32768
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#define PNG_DISPOSE_OP_NONE 0x00
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#define PNG_DISPOSE_OP_BACKGROUND 0x01
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#define PNG_DISPOSE_OP_PREVIOUS 0x02
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#define PNG_BLEND_OP_SOURCE 0x00
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#define PNG_BLEND_OP_OVER 0x01
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#define notabc(c) ((c) < 65 || (c) > 122 || ((c) > 90 && (c) < 97))
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#define ROWBYTES(pixel_bits, width) \
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((pixel_bits) >= 8 ? \
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((width) * (((unsigned int)(pixel_bits)) >> 3)) : \
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(( ((width) * ((unsigned int)(pixel_bits))) + 7) >> 3) )
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unsigned char png_sign[8] = {137, 80, 78, 71, 13, 10, 26, 10};
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int mask4[2]={240,15};
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int shift4[2]={4,0};
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int mask2[4]={192,48,12,3};
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int shift2[4]={6,4,2,0};
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int mask1[8]={128,64,32,16,8,4,2,1};
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int shift1[8]={7,6,5,4,3,2,1,0};
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unsigned int keep_original = 1;
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unsigned char pal[256][3];
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unsigned char trns[256];
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unsigned int palsize, trnssize;
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unsigned int hasTRNS;
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unsigned short trns1, trns2, trns3;
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unsigned int read32(FILE * f1)
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{
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unsigned char a, b, c, d;
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fread(&a, 1, 1, f1);
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fread(&b, 1, 1, f1);
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fread(&c, 1, 1, f1);
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fread(&d, 1, 1, f1);
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return ((unsigned int)a<<24)+((unsigned int)b<<16)+((unsigned int)c<<8)+(unsigned int)d;
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}
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unsigned short read16(FILE * f1)
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{
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unsigned char a, b;
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fread(&a, 1, 1, f1);
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fread(&b, 1, 1, f1);
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return ((unsigned short)a<<8)+(unsigned short)b;
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}
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unsigned short readshort(unsigned char * p)
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{
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return ((unsigned short)(*p)<<8)+(unsigned short)(*(p+1));
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}
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void read_sub_row(unsigned char * row, unsigned int rowbytes, unsigned int bpp)
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{
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unsigned int i;
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for (i=bpp; i<rowbytes; i++)
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row[i] += row[i-bpp];
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}
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void read_up_row(unsigned char * row, unsigned char * prev_row, unsigned int rowbytes, unsigned int bpp)
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{
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unsigned int i;
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if (prev_row)
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for (i=0; i<rowbytes; i++)
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row[i] += prev_row[i];
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}
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void read_average_row(unsigned char * row, unsigned char * prev_row, unsigned int rowbytes, unsigned int bpp)
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{
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unsigned int i;
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if (prev_row)
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{
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for (i=0; i<bpp; i++)
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row[i] += prev_row[i]>>1;
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for (i=bpp; i<rowbytes; i++)
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row[i] += (prev_row[i] + row[i-bpp])>>1;
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}
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else
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{
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for (i=bpp; i<rowbytes; i++)
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row[i] += row[i-bpp]>>1;
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}
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}
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void read_paeth_row(unsigned char * row, unsigned char * prev_row, unsigned int rowbytes, unsigned int bpp)
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{
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unsigned int i;
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int a, b, c, pa, pb, pc, p;
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if (prev_row)
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{
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for (i=0; i<bpp; i++)
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row[i] += prev_row[i];
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for (i=bpp; i<rowbytes; i++)
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{
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a = row[i-bpp];
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b = prev_row[i];
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c = prev_row[i-bpp];
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p = b - c;
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pc = a - c;
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pa = abs(p);
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pb = abs(pc);
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pc = abs(p + pc);
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row[i] += ((pa <= pb && pa <= pc) ? a : (pb <= pc) ? b : c);
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}
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}
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else
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{
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for (i=bpp; i<rowbytes; i++)
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row[i] += row[i-bpp];
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}
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}
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void unpack(z_stream zstream, unsigned char * dst, unsigned int dst_size, unsigned char * src, unsigned int src_size, unsigned int h, unsigned int rowbytes, unsigned char bpp)
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{
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unsigned int j;
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unsigned char * row = dst;
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unsigned char * prev_row = NULL;
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zstream.next_out = dst;
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zstream.avail_out = dst_size;
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zstream.next_in = src;
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zstream.avail_in = src_size;
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inflate(&zstream, Z_FINISH);
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inflateReset(&zstream);
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for (j=0; j<h; j++)
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{
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switch (*row++)
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{
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case 0: break;
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case 1: read_sub_row(row, rowbytes, bpp); break;
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case 2: read_up_row(row, prev_row, rowbytes, bpp); break;
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case 3: read_average_row(row, prev_row, rowbytes, bpp); break;
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case 4: read_paeth_row(row, prev_row, rowbytes, bpp); break;
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}
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prev_row = row;
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row += rowbytes;
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}
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}
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void compose0(unsigned char * dst1, unsigned int dstbytes1, unsigned char * dst2, unsigned int dstbytes2, unsigned char * src, unsigned int srcbytes, unsigned int w, unsigned int h, unsigned int bop, unsigned char depth)
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{
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unsigned int i, j, g, a;
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unsigned char * sp;
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unsigned char * dp1;
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unsigned int * dp2;
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for (j=0; j<h; j++)
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{
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sp = src+1;
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dp1 = dst1;
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dp2 = (unsigned int*)dst2;
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if (bop == PNG_BLEND_OP_SOURCE)
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{
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switch (depth)
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{
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case 16: for (i=0; i<w; i++) { a = 0xFF; if (hasTRNS && readshort(sp)==trns1) a = 0; *dp1++ = *sp; *dp2++ = (a << 24) + (*sp << 16) + (*sp << 8) + *sp; sp+=2; } break;
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case 8: for (i=0; i<w; i++) { a = 0xFF; if (hasTRNS && *sp==trns1) a = 0; *dp1++ = *sp; *dp2++ = (a << 24) + (*sp << 16) + (*sp << 8) + *sp; sp++; } break;
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case 4: for (i=0; i<w; i++) { g = (sp[i>>1] & mask4[i&1]) >> shift4[i&1]; a = 0xFF; if (hasTRNS && g==trns1) a = 0; *dp1++ = g*0x11; *dp2++ = (a<<24) + g*0x111111; } break;
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case 2: for (i=0; i<w; i++) { g = (sp[i>>2] & mask2[i&3]) >> shift2[i&3]; a = 0xFF; if (hasTRNS && g==trns1) a = 0; *dp1++ = g*0x55; *dp2++ = (a<<24) + g*0x555555; } break;
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case 1: for (i=0; i<w; i++) { g = (sp[i>>3] & mask1[i&7]) >> shift1[i&7]; a = 0xFF; if (hasTRNS && g==trns1) a = 0; *dp1++ = g*0xFF; *dp2++ = (a<<24) + g*0xFFFFFF; } break;
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}
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}
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else /* PNG_BLEND_OP_OVER */
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{
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switch (depth)
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{
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case 16: for (i=0; i<w; i++, dp1++, dp2++) { if (readshort(sp) != trns1) { *dp1 = *sp; *dp2 = 0xFF000000 + (*sp << 16) + (*sp << 8) + *sp; } sp+=2; } break;
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case 8: for (i=0; i<w; i++, dp1++, dp2++) { if (*sp != trns1) { *dp1 = *sp; *dp2 = 0xFF000000 + (*sp << 16) + (*sp << 8) + *sp; } sp++; } break;
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case 4: for (i=0; i<w; i++, dp1++, dp2++) { g = (sp[i>>1] & mask4[i&1]) >> shift4[i&1]; if (g != trns1) { *dp1 = g*0x11; *dp2 = 0xFF000000+g*0x111111; } } break;
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case 2: for (i=0; i<w; i++, dp1++, dp2++) { g = (sp[i>>2] & mask2[i&3]) >> shift2[i&3]; if (g != trns1) { *dp1 = g*0x55; *dp2 = 0xFF000000+g*0x555555; } } break;
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case 1: for (i=0; i<w; i++, dp1++, dp2++) { g = (sp[i>>3] & mask1[i&7]) >> shift1[i&7]; if (g != trns1) { *dp1 = g*0xFF; *dp2 = 0xFF000000+g*0xFFFFFF; } } break;
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}
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}
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src += srcbytes;
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dst1 += dstbytes1;
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dst2 += dstbytes2;
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}
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}
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void compose2(unsigned char * dst1, unsigned int dstbytes1, unsigned char * dst2, unsigned int dstbytes2, unsigned char * src, unsigned int srcbytes, unsigned int w, unsigned int h, unsigned int bop, unsigned char depth)
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{
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unsigned int i, j;
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unsigned int r, g, b, a;
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unsigned char * sp;
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unsigned char * dp1;
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unsigned int * dp2;
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for (j=0; j<h; j++)
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{
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sp = src+1;
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dp1 = dst1;
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dp2 = (unsigned int*)dst2;
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if (bop == PNG_BLEND_OP_SOURCE)
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{
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if (depth == 8)
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{
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for (i=0; i<w; i++)
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{
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b = *sp++;
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g = *sp++;
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r = *sp++;
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a = 0xFF;
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if (hasTRNS && b==trns1 && g==trns2 && r==trns3)
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a = 0;
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*dp1++ = b; *dp1++ = g; *dp1++ = r;
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*dp2++ = (a << 24) + (r << 16) + (g << 8) + b;
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}
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}
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else
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{
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for (i=0; i<w; i++, sp+=6)
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{
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b = *sp;
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g = *(sp+2);
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r = *(sp+4);
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a = 0xFF;
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if (hasTRNS && readshort(sp)==trns1 && readshort(sp+2)==trns2 && readshort(sp+4)==trns3)
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a = 0;
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*dp1++ = b; *dp1++ = g; *dp1++ = r;
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*dp2++ = (a << 24) + (r << 16) + (g << 8) + b;
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}
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}
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}
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else /* PNG_BLEND_OP_OVER */
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{
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if (depth == 8)
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{
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for (i=0; i<w; i++, sp+=3, dp1+=3, dp2++)
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if ((*sp != trns1) || (*(sp+1) != trns2) || (*(sp+2) != trns3))
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{
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*dp1 = *sp; *(dp1+1) = *(sp+1); *(dp1+2) = *(sp+2);
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*dp2 = 0xFF000000 + (*(sp+2) << 16) + (*(sp+1) << 8) + *sp;
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}
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}
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else
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{
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for (i=0; i<w; i++, sp+=6, dp1+=3, dp2++)
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if ((readshort(sp) != trns1) || (readshort(sp+2) != trns2) || (readshort(sp+4) != trns3))
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{
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*dp1 = *sp; *(dp1+1) = *(sp+2); *(dp1+2) = *(sp+4);
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*dp2 = 0xFF000000 + (*(sp+4) << 16) + (*(sp+2) << 8) + *sp;
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}
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}
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}
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src += srcbytes;
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dst1 += dstbytes1;
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dst2 += dstbytes2;
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}
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}
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void compose3(unsigned char * dst1, unsigned int dstbytes1, unsigned char * dst2, unsigned int dstbytes2, unsigned char * src, unsigned int srcbytes, unsigned int w, unsigned int h, unsigned int bop, unsigned char depth)
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{
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unsigned int i, j;
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unsigned int r, g, b, a;
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unsigned int r2, g2, b2, a2;
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int u, v, al;
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unsigned char col = 0;
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unsigned char * sp;
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unsigned char * dp1;
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unsigned int * dp2;
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for (j=0; j<h; j++)
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{
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sp = src+1;
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dp1 = dst1;
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dp2 = (unsigned int*)dst2;
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for (i=0; i<w; i++)
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{
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||
|
|
switch (depth)
|
||
|
|
{
|
||
|
|
case 8: col = sp[i]; break;
|
||
|
|
case 4: col = (sp[i>>1] & mask4[i&1]) >> shift4[i&1]; break;
|
||
|
|
case 2: col = (sp[i>>2] & mask2[i&3]) >> shift2[i&3]; break;
|
||
|
|
case 1: col = (sp[i>>3] & mask1[i&7]) >> shift1[i&7]; break;
|
||
|
|
}
|
||
|
|
|
||
|
|
b = pal[col][0];
|
||
|
|
g = pal[col][1];
|
||
|
|
r = pal[col][2];
|
||
|
|
a = trns[col];
|
||
|
|
|
||
|
|
if (bop == PNG_BLEND_OP_SOURCE)
|
||
|
|
{
|
||
|
|
*dp1++ = col;
|
||
|
|
*dp2++ = (a << 24) + (r << 16) + (g << 8) + b;
|
||
|
|
}
|
||
|
|
else /* PNG_BLEND_OP_OVER */
|
||
|
|
{
|
||
|
|
if (a == 255)
|
||
|
|
{
|
||
|
|
*dp1++ = col;
|
||
|
|
*dp2++ = (a << 24) + (r << 16) + (g << 8) + b;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
if (a != 0)
|
||
|
|
{
|
||
|
|
if ((a2 = (*dp2)>>24))
|
||
|
|
{
|
||
|
|
keep_original = 0;
|
||
|
|
u = a*255;
|
||
|
|
v = (255-a)*a2;
|
||
|
|
al = 255*255-(255-a)*(255-a2);
|
||
|
|
b2 = ((*dp2)&255);
|
||
|
|
g2 = (((*dp2)>>8)&255);
|
||
|
|
r2 = (((*dp2)>>16)&255);
|
||
|
|
b = (b*u + b2*v)/al;
|
||
|
|
g = (g*u + g2*v)/al;
|
||
|
|
r = (r*u + r2*v)/al;
|
||
|
|
a = al/255;
|
||
|
|
}
|
||
|
|
*dp1++ = col;
|
||
|
|
*dp2++ = (a << 24) + (r << 16) + (g << 8) + b;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
dp1++;
|
||
|
|
dp2++;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
src += srcbytes;
|
||
|
|
dst1 += dstbytes1;
|
||
|
|
dst2 += dstbytes2;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void compose4(unsigned char * dst, unsigned int dstbytes, unsigned char * src, unsigned int srcbytes, unsigned int w, unsigned int h, unsigned int bop, unsigned char depth)
|
||
|
|
{
|
||
|
|
unsigned int i, j, step;
|
||
|
|
unsigned int g, a, g2, a2;
|
||
|
|
int u, v, al;
|
||
|
|
unsigned char * sp;
|
||
|
|
unsigned char * dp;
|
||
|
|
|
||
|
|
step = (depth+7)/8;
|
||
|
|
|
||
|
|
for (j=0; j<h; j++)
|
||
|
|
{
|
||
|
|
sp = src+1;
|
||
|
|
dp = dst;
|
||
|
|
|
||
|
|
if (bop == PNG_BLEND_OP_SOURCE)
|
||
|
|
{
|
||
|
|
for (i=0; i<w; i++)
|
||
|
|
{
|
||
|
|
g = *sp; sp += step;
|
||
|
|
a = *sp; sp += step;
|
||
|
|
*dp++ = g;
|
||
|
|
*dp++ = a;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else /* PNG_BLEND_OP_OVER */
|
||
|
|
{
|
||
|
|
for (i=0; i<w; i++)
|
||
|
|
{
|
||
|
|
g = *sp; sp += step;
|
||
|
|
a = *sp; sp += step;
|
||
|
|
if (a == 255)
|
||
|
|
{
|
||
|
|
*dp++ = g;
|
||
|
|
*dp++ = a;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
if (a != 0)
|
||
|
|
{
|
||
|
|
if ((a2 = *(dp+1)))
|
||
|
|
{
|
||
|
|
u = a*255;
|
||
|
|
v = (255-a)*a2;
|
||
|
|
al = 255*255-(255-a)*(255-a2);
|
||
|
|
g2 = ((*dp)&255);
|
||
|
|
g = (g*u + g2*v)/al;
|
||
|
|
a = al/255;
|
||
|
|
}
|
||
|
|
*dp++ = g;
|
||
|
|
*dp++ = a;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
dp+=2;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
src += srcbytes;
|
||
|
|
dst += dstbytes;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void compose6(unsigned char * dst, unsigned int dstbytes, unsigned char * src, unsigned int srcbytes, unsigned int w, unsigned int h, unsigned int bop, unsigned char depth)
|
||
|
|
{
|
||
|
|
unsigned int i, j, step;
|
||
|
|
unsigned int r, g, b, a;
|
||
|
|
unsigned int r2, g2, b2, a2;
|
||
|
|
int u, v, al;
|
||
|
|
unsigned char * sp;
|
||
|
|
unsigned int * dp;
|
||
|
|
|
||
|
|
step = (depth+7)/8;
|
||
|
|
|
||
|
|
for (j=0; j<h; j++)
|
||
|
|
{
|
||
|
|
sp = src+1;
|
||
|
|
dp = (unsigned int*)dst;
|
||
|
|
|
||
|
|
if (bop == PNG_BLEND_OP_SOURCE)
|
||
|
|
{
|
||
|
|
for (i=0; i<w; i++)
|
||
|
|
{
|
||
|
|
b = *sp; sp += step;
|
||
|
|
g = *sp; sp += step;
|
||
|
|
r = *sp; sp += step;
|
||
|
|
a = *sp; sp += step;
|
||
|
|
*dp++ = (a << 24) + (r << 16) + (g << 8) + b;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else /* PNG_BLEND_OP_OVER */
|
||
|
|
{
|
||
|
|
for (i=0; i<w; i++)
|
||
|
|
{
|
||
|
|
b = *sp; sp += step;
|
||
|
|
g = *sp; sp += step;
|
||
|
|
r = *sp; sp += step;
|
||
|
|
a = *sp; sp += step;
|
||
|
|
if (a == 255)
|
||
|
|
*dp++ = (a << 24) + (r << 16) + (g << 8) + b;
|
||
|
|
else
|
||
|
|
if (a != 0)
|
||
|
|
{
|
||
|
|
if ((a2 = (*dp)>>24))
|
||
|
|
{
|
||
|
|
u = a*255;
|
||
|
|
v = (255-a)*a2;
|
||
|
|
al = 255*255-(255-a)*(255-a2);
|
||
|
|
b2 = ((*dp)&255);
|
||
|
|
g2 = (((*dp)>>8)&255);
|
||
|
|
r2 = (((*dp)>>16)&255);
|
||
|
|
b = (b*u + b2*v)/al;
|
||
|
|
g = (g*u + g2*v)/al;
|
||
|
|
r = (r*u + r2*v)/al;
|
||
|
|
a = al/255;
|
||
|
|
}
|
||
|
|
*dp++ = (a << 24) + (r << 16) + (g << 8) + b;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
dp++;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
src += srcbytes;
|
||
|
|
dst += dstbytes;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
int load_apng(unsigned char *filedata, unsigned int filesize, struct apng_data *apng)
|
||
|
|
{
|
||
|
|
int res;
|
||
|
|
unsigned int i, j;
|
||
|
|
unsigned int rowbytes;
|
||
|
|
int imagesize, zbuf_size, zsize, trns_idx;
|
||
|
|
unsigned int len, chunk, crc;
|
||
|
|
unsigned int w, h, seq, w0, h0, x0, y0;
|
||
|
|
unsigned int frames, loops, first_frame, cur_frame;
|
||
|
|
unsigned int outrow1, outrow2, outimg1, outimg2;
|
||
|
|
unsigned short d1, d2;
|
||
|
|
unsigned char c, dop, bop;
|
||
|
|
unsigned char channels, depth, pixeldepth, bpp;
|
||
|
|
unsigned char coltype, compr, filter, interl;
|
||
|
|
z_stream zstream;
|
||
|
|
memset(apng, 0, sizeof(struct apng_data));
|
||
|
|
FILE * f1 = fmemopen(filedata, filesize, "rb");
|
||
|
|
if(!f1)
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
for (i=0; i<256; i++)
|
||
|
|
{
|
||
|
|
pal[i][0] = i;
|
||
|
|
pal[i][1] = i;
|
||
|
|
pal[i][2] = i;
|
||
|
|
trns[i] = 255;
|
||
|
|
}
|
||
|
|
|
||
|
|
zstream.zalloc = Z_NULL;
|
||
|
|
zstream.zfree = Z_NULL;
|
||
|
|
zstream.opaque = Z_NULL;
|
||
|
|
inflateInit(&zstream);
|
||
|
|
|
||
|
|
frames = 1;
|
||
|
|
first_frame = 0;
|
||
|
|
cur_frame = 0;
|
||
|
|
zsize = 0;
|
||
|
|
hasTRNS = 0;
|
||
|
|
trns_idx = -1;
|
||
|
|
x0 = 0;
|
||
|
|
y0 = 0;
|
||
|
|
loops = 0;
|
||
|
|
bop = PNG_BLEND_OP_SOURCE;
|
||
|
|
|
||
|
|
unsigned char sig[8];
|
||
|
|
unsigned char * pOut1;
|
||
|
|
unsigned char * pOut2;
|
||
|
|
unsigned char * pTemp;
|
||
|
|
unsigned char * pData;
|
||
|
|
unsigned char * pImg1;
|
||
|
|
unsigned char * pImg2;
|
||
|
|
unsigned char * pDst1;
|
||
|
|
unsigned char * pDst2;
|
||
|
|
unsigned int * frames_delay;
|
||
|
|
|
||
|
|
if ((res = fread(sig, 1, 8, f1)) == 8)
|
||
|
|
{
|
||
|
|
if (memcmp(sig, png_sign, 8) == 0)
|
||
|
|
{
|
||
|
|
len = read32(f1);
|
||
|
|
chunk = read32(f1);
|
||
|
|
|
||
|
|
if ((len == 13) && (chunk == 0x49484452)) /* IHDR */
|
||
|
|
{
|
||
|
|
w = w0 = read32(f1);
|
||
|
|
h = h0 = read32(f1);
|
||
|
|
fread(&depth, 1, 1, f1);
|
||
|
|
fread(&coltype, 1, 1, f1);
|
||
|
|
fread(&compr, 1, 1, f1);
|
||
|
|
fread(&filter, 1, 1, f1);
|
||
|
|
fread(&interl, 1, 1, f1);
|
||
|
|
crc = read32(f1);
|
||
|
|
|
||
|
|
channels = 1;
|
||
|
|
if (coltype == 2)
|
||
|
|
channels = 3;
|
||
|
|
else if (coltype == 4)
|
||
|
|
channels = 2;
|
||
|
|
else if (coltype == 6)
|
||
|
|
channels = 4;
|
||
|
|
if(coltype == 3)
|
||
|
|
printf("coltype %d w %d h %d\n", coltype, w, h);
|
||
|
|
|
||
|
|
pixeldepth = depth*channels;
|
||
|
|
bpp = (pixeldepth + 7) >> 3;
|
||
|
|
rowbytes = ROWBYTES(pixeldepth, w);
|
||
|
|
|
||
|
|
imagesize = (rowbytes + 1) * h;
|
||
|
|
zbuf_size = imagesize + ((imagesize + 7) >> 3) + ((imagesize + 63) >> 6) + 11;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* We'll render into 2 output buffers, first in original coltype,
|
||
|
|
* second in RGBA.
|
||
|
|
*
|
||
|
|
* It's better to try to keep the original coltype, but if dispose/blend
|
||
|
|
* operations will make it impossible, then we'll save RGBA version instead.
|
||
|
|
*/
|
||
|
|
|
||
|
|
outrow1 = w*channels; /* output coltype = input coltype */
|
||
|
|
outrow2 = w*4; /* output coltype = RGBA */
|
||
|
|
outimg1 = h*outrow1;
|
||
|
|
outimg2 = h*outrow2;
|
||
|
|
|
||
|
|
pOut1=(unsigned char *)malloc(outimg1);
|
||
|
|
pOut2=(unsigned char *)malloc(outimg2);
|
||
|
|
pTemp=(unsigned char *)malloc(imagesize);
|
||
|
|
pData=(unsigned char *)malloc(zbuf_size);
|
||
|
|
pImg1=pOut1;
|
||
|
|
pImg2=pOut2;
|
||
|
|
frames_delay = NULL;
|
||
|
|
|
||
|
|
/* apng decoding - begin */
|
||
|
|
memset(pOut1, 0, outimg1);
|
||
|
|
memset(pOut2, 0, outimg2);
|
||
|
|
|
||
|
|
while ( !feof(f1) )
|
||
|
|
{
|
||
|
|
len = read32(f1);
|
||
|
|
chunk = read32(f1);
|
||
|
|
|
||
|
|
if (chunk == 0x504C5445) /* PLTE */
|
||
|
|
{
|
||
|
|
unsigned int col;
|
||
|
|
for (i=0; i<len; i++)
|
||
|
|
{
|
||
|
|
fread(&c, 1, 1, f1);
|
||
|
|
col = i/3;
|
||
|
|
if (col<256)
|
||
|
|
{
|
||
|
|
pal[col][i%3] = c;
|
||
|
|
palsize = col+1;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
crc = read32(f1);
|
||
|
|
}
|
||
|
|
else if (chunk == 0x74524E53) /* tRNS */
|
||
|
|
{
|
||
|
|
hasTRNS = 1;
|
||
|
|
for (i=0; i<len; i++)
|
||
|
|
{
|
||
|
|
fread(&c, 1, 1, f1);
|
||
|
|
if (i<256)
|
||
|
|
{
|
||
|
|
trns[i] = c;
|
||
|
|
trnssize = i+1;
|
||
|
|
if (c == 0 && coltype == 3 && trns_idx == -1)
|
||
|
|
trns_idx = i;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (coltype == 0)
|
||
|
|
{
|
||
|
|
trns1 = readshort(&trns[0]);
|
||
|
|
if (depth == 16)
|
||
|
|
{
|
||
|
|
trns[1] = trns[0]; trns[0] = 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else
|
||
|
|
if (coltype == 2)
|
||
|
|
{
|
||
|
|
trns1 = readshort(&trns[0]);
|
||
|
|
trns2 = readshort(&trns[2]);
|
||
|
|
trns3 = readshort(&trns[4]);
|
||
|
|
if (depth == 16)
|
||
|
|
{
|
||
|
|
trns[1] = trns[0]; trns[0] = 0;
|
||
|
|
trns[3] = trns[2]; trns[2] = 0;
|
||
|
|
trns[5] = trns[4]; trns[4] = 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
crc = read32(f1);
|
||
|
|
}
|
||
|
|
else if (chunk == 0x6163544C) /* acTL */
|
||
|
|
{
|
||
|
|
frames = read32(f1);
|
||
|
|
if(frames_delay)
|
||
|
|
free(frames_delay);
|
||
|
|
frames_delay = (unsigned int*)malloc(frames*sizeof(int));
|
||
|
|
loops = read32(f1);
|
||
|
|
crc = read32(f1);
|
||
|
|
if (pOut1)
|
||
|
|
free(pOut1);
|
||
|
|
if (pOut2)
|
||
|
|
free(pOut2);
|
||
|
|
pOut1 = (unsigned char *)malloc((frames+1)*outimg1);
|
||
|
|
pOut2 = (unsigned char *)malloc((frames+1)*outimg2);
|
||
|
|
pImg1 = pOut1;
|
||
|
|
pImg2 = pOut2;
|
||
|
|
memset(pOut1, 0, outimg1);
|
||
|
|
memset(pOut2, 0, outimg2);
|
||
|
|
}
|
||
|
|
else if (chunk == 0x6663544C) /* fcTL */
|
||
|
|
{
|
||
|
|
if (zsize == 0)
|
||
|
|
first_frame = 1;
|
||
|
|
else
|
||
|
|
{
|
||
|
|
if (dop == PNG_DISPOSE_OP_PREVIOUS)
|
||
|
|
{
|
||
|
|
if (coltype != 6)
|
||
|
|
memcpy(pImg1 + outimg1, pImg1, outimg1);
|
||
|
|
if (coltype != 4)
|
||
|
|
memcpy(pImg2 + outimg2, pImg2, outimg2);
|
||
|
|
}
|
||
|
|
|
||
|
|
pDst1 = pImg1 + y0*outrow1 + x0*channels;
|
||
|
|
pDst2 = pImg2 + y0*outrow2 + x0*4;
|
||
|
|
unpack(zstream, pTemp, imagesize, pData, zsize, h0, rowbytes, bpp);
|
||
|
|
switch (coltype)
|
||
|
|
{
|
||
|
|
case 0: compose0(pDst1, outrow1, pDst2, outrow2, pTemp, rowbytes+1, w0, h0, bop, depth); break;
|
||
|
|
case 2: compose2(pDst1, outrow1, pDst2, outrow2, pTemp, rowbytes+1, w0, h0, bop, depth); break;
|
||
|
|
case 3: compose3(pDst1, outrow1, pDst2, outrow2, pTemp, rowbytes+1, w0, h0, bop, depth); break;
|
||
|
|
case 4: compose4(pDst1, outrow1, pTemp, rowbytes+1, w0, h0, bop, depth); break;
|
||
|
|
case 6: compose6( pDst2, outrow2, pTemp, rowbytes+1, w0, h0, bop, depth); break;
|
||
|
|
}
|
||
|
|
zsize = 0;
|
||
|
|
|
||
|
|
if (dop != PNG_DISPOSE_OP_PREVIOUS)
|
||
|
|
{
|
||
|
|
if (coltype != 6)
|
||
|
|
memcpy(pImg1 + outimg1, pImg1, outimg1);
|
||
|
|
if (coltype != 4)
|
||
|
|
memcpy(pImg2 + outimg2, pImg2, outimg2);
|
||
|
|
|
||
|
|
if (dop == PNG_DISPOSE_OP_BACKGROUND)
|
||
|
|
{
|
||
|
|
pDst1 += outimg1;
|
||
|
|
pDst2 += outimg2;
|
||
|
|
|
||
|
|
for (j=0; j<h0; j++)
|
||
|
|
{
|
||
|
|
switch (coltype)
|
||
|
|
{
|
||
|
|
case 0: memset(pDst2, 0, w0*4); if (hasTRNS) memset(pDst1, trns[1], w0); else keep_original = 0; break;
|
||
|
|
case 2: memset(pDst2, 0, w0*4); if (hasTRNS) for (i=0; i<w0; i++) { pDst1[i*3] = trns[1]; pDst1[i*3+1] = trns[3]; pDst1[i*3+2] = trns[5]; } else keep_original = 0; break;
|
||
|
|
case 3: memset(pDst2, 0, w0*4); if (trns_idx >= 0) memset(pDst1, trns_idx, w0); else keep_original = 0; break;
|
||
|
|
case 4: memset(pDst1, 0, w0*2); break;
|
||
|
|
case 6: memset(pDst2, 0, w0*4); break;
|
||
|
|
}
|
||
|
|
pDst1 += outrow1;
|
||
|
|
pDst2 += outrow2;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
seq = read32(f1);
|
||
|
|
w0 = read32(f1);
|
||
|
|
h0 = read32(f1);
|
||
|
|
x0 = read32(f1);
|
||
|
|
y0 = read32(f1);
|
||
|
|
d1 = read16(f1);
|
||
|
|
d2 = read16(f1);
|
||
|
|
fread(&dop, 1, 1, f1);
|
||
|
|
fread(&bop, 1, 1, f1);
|
||
|
|
crc = read32(f1);
|
||
|
|
|
||
|
|
if(d2 == 0)
|
||
|
|
d2 = 100;
|
||
|
|
frames_delay[cur_frame] = (d1 * 1000)/d2;
|
||
|
|
|
||
|
|
if (cur_frame == 0)
|
||
|
|
{
|
||
|
|
bop = PNG_BLEND_OP_SOURCE;
|
||
|
|
if (dop == PNG_DISPOSE_OP_PREVIOUS)
|
||
|
|
dop = PNG_DISPOSE_OP_BACKGROUND;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!(coltype & 4) && !(hasTRNS))
|
||
|
|
bop = PNG_BLEND_OP_SOURCE;
|
||
|
|
|
||
|
|
rowbytes = ROWBYTES(pixeldepth, w0);
|
||
|
|
cur_frame++;
|
||
|
|
pImg1 += outimg1;
|
||
|
|
pImg2 += outimg2;
|
||
|
|
}
|
||
|
|
else if (chunk == 0x49444154) /* IDAT */
|
||
|
|
{
|
||
|
|
fread(pData + zsize, 1, len, f1);
|
||
|
|
zsize += len;
|
||
|
|
crc = read32(f1);
|
||
|
|
}
|
||
|
|
else if (chunk == 0x66644154) /* fdAT */
|
||
|
|
{
|
||
|
|
seq = read32(f1);
|
||
|
|
len -= 4;
|
||
|
|
fread(pData + zsize, 1, len, f1);
|
||
|
|
zsize += len;
|
||
|
|
crc = read32(f1);
|
||
|
|
}
|
||
|
|
else if (chunk == 0x49454E44) /* IEND */
|
||
|
|
{
|
||
|
|
pDst1 = pImg1 + y0*outrow1 + x0*channels;
|
||
|
|
pDst2 = pImg2 + y0*outrow2 + x0*4;
|
||
|
|
unpack(zstream, pTemp, imagesize, pData, zsize, h0, rowbytes, bpp);
|
||
|
|
switch (coltype)
|
||
|
|
{
|
||
|
|
case 0: compose0(pDst1, outrow1, pDst2, outrow2, pTemp, rowbytes+1, w0, h0, bop, depth); break;
|
||
|
|
case 2: compose2(pDst1, outrow1, pDst2, outrow2, pTemp, rowbytes+1, w0, h0, bop, depth); break;
|
||
|
|
case 3: compose3(pDst1, outrow1, pDst2, outrow2, pTemp, rowbytes+1, w0, h0, bop, depth); break;
|
||
|
|
case 4: compose4(pDst1, outrow1, pTemp, rowbytes+1, w0, h0, bop, depth); break;
|
||
|
|
case 6: compose6( pDst2, outrow2, pTemp, rowbytes+1, w0, h0, bop, depth); break;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
c = (unsigned char)(chunk>>24);
|
||
|
|
if (notabc(c)) break;
|
||
|
|
c = (unsigned char)((chunk>>16) & 0xFF);
|
||
|
|
if (notabc(c)) break;
|
||
|
|
c = (unsigned char)((chunk>>8) & 0xFF);
|
||
|
|
if (notabc(c)) break;
|
||
|
|
c = (unsigned char)(chunk & 0xFF);
|
||
|
|
if (notabc(c)) break;
|
||
|
|
|
||
|
|
fseek( f1, len, SEEK_CUR );
|
||
|
|
crc = read32(f1);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
/* apng decoding - end */
|
||
|
|
|
||
|
|
if (coltype == 0)
|
||
|
|
{
|
||
|
|
switch (depth)
|
||
|
|
{
|
||
|
|
case 4: trns[1] *= 0x11; break;
|
||
|
|
case 2: trns[1] *= 0x55; break;
|
||
|
|
case 1: trns[1] *= 0xFF; break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
inflateEnd(&zstream);
|
||
|
|
|
||
|
|
apng->bpp = channels;
|
||
|
|
apng->coltype = coltype;
|
||
|
|
apng->last_frame = cur_frame;
|
||
|
|
apng->first_frame = first_frame;
|
||
|
|
apng->height = h;
|
||
|
|
apng->width = w;
|
||
|
|
apng->num_frames = frames;
|
||
|
|
apng->num_plays = loops;
|
||
|
|
apng->frames_delay = frames_delay;
|
||
|
|
apng->pdata = pOut2;
|
||
|
|
apng->bpp = 4;
|
||
|
|
apng->coltype = 6;
|
||
|
|
|
||
|
|
if(pData)
|
||
|
|
free(pData);
|
||
|
|
if(pTemp)
|
||
|
|
free(pTemp);
|
||
|
|
if(pOut1)
|
||
|
|
free(pOut1);
|
||
|
|
} else
|
||
|
|
return -1;
|
||
|
|
} else
|
||
|
|
return -1;
|
||
|
|
} else
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
void free_apng(struct apng_data *apng)
|
||
|
|
{
|
||
|
|
if(apng->pdata)
|
||
|
|
free(apng->pdata);
|
||
|
|
if(apng->frames_delay)
|
||
|
|
free(apng->frames_delay);
|
||
|
|
}
|