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3cb724253b
"Dockerfile" etc PDF417: lessen some debug verbosity gif: use "gif_" prefix; some code fiddling
474 lines
18 KiB
C
474 lines
18 KiB
C
/* gif.c - Handles output to gif file */
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/*
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libzint - the open source barcode library
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Copyright (C) 2009-2024 Robin Stuart <rstuart114@gmail.com>
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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3. Neither the name of the project nor the names of its contributors
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may be used to endorse or promote products derived from this software
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without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
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FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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SUCH DAMAGE.
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*/
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/* SPDX-License-Identifier: BSD-3-Clause */
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#include <errno.h>
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#include <stdio.h>
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#include "common.h"
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#include "filemem.h"
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#include "output.h"
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/* Set LZW buffer paging size to this in expectation that compressed data will fit for typical scalings */
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#define GIF_LZW_PAGE_SIZE 0x100000 /* Megabyte */
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struct gif_state {
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struct filemem *fmp;
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unsigned char *pOut;
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const unsigned char *pIn;
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const unsigned char *pInEnd;
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size_t OutLength;
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size_t OutPosCur;
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size_t OutByteCountPos;
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unsigned short ClearCode;
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unsigned short FreeCode;
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char fByteCountByteSet;
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char fOutPaged;
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unsigned char OutBitsFree;
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unsigned short NodeAxon[4096];
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unsigned short NodeNext[4096];
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unsigned char NodePix[4096];
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unsigned char map[256];
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};
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static void gif_BufferNextByte(struct gif_state *pState) {
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(pState->OutPosCur)++;
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if (pState->fOutPaged && pState->OutPosCur + 2 >= pState->OutLength) {
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/* Keep last 256 bytes so `OutByteCountPos` within range */
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fm_write(pState->pOut, 1, pState->OutPosCur - 256, pState->fmp);
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memmove(pState->pOut, pState->pOut + pState->OutPosCur - 256, 256);
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pState->OutByteCountPos -= pState->OutPosCur - 256;
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pState->OutPosCur = 256;
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}
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/* Check if this position is a byte count position
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* `fByteCountByteSet` indicates, if byte count position bytes should be
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* inserted in general.
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* If this is true, and the distance to the last byte count position is 256
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* (e.g. 255 bytes in between), a byte count byte is inserted, and the value
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* of the last one is set to 255.
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* */
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if (pState->fByteCountByteSet && (pState->OutByteCountPos + 256 == pState->OutPosCur)) {
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(pState->pOut)[pState->OutByteCountPos] = 255;
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pState->OutByteCountPos = pState->OutPosCur;
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(pState->OutPosCur)++;
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}
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(pState->pOut)[pState->OutPosCur] = 0x00;
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}
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static void gif_AddCodeToBuffer(struct gif_state *pState, unsigned short CodeIn, unsigned char CodeBits) {
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/* Check, if we may fill up the current byte completely */
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if (CodeBits >= pState->OutBitsFree) {
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(pState->pOut)[pState->OutPosCur] |= (unsigned char) (CodeIn << (8 - pState->OutBitsFree));
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gif_BufferNextByte(pState);
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CodeIn = (unsigned short) (CodeIn >> pState->OutBitsFree);
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CodeBits -= pState->OutBitsFree;
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pState->OutBitsFree = 8;
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/* Write a full byte if there are at least 8 code bits left */
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if (CodeBits >= pState->OutBitsFree) {
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(pState->pOut)[pState->OutPosCur] = (unsigned char) CodeIn;
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gif_BufferNextByte(pState);
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CodeIn = (unsigned short) (CodeIn >> 8);
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CodeBits -= 8;
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}
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}
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/* The remaining bits of CodeIn fit in the current byte. */
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if (CodeBits > 0) {
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(pState->pOut)[pState->OutPosCur] |= (unsigned char) (CodeIn << (8 - pState->OutBitsFree));
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pState->OutBitsFree -= CodeBits;
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}
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}
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static void gif_FlushStringTable(struct gif_state *pState) {
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unsigned short Pos;
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for (Pos = 0; Pos < pState->ClearCode; Pos++) {
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(pState->NodeAxon)[Pos] = 0;
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}
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}
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static unsigned short gif_FindPixelOutlet(struct gif_state *pState, unsigned short HeadNode, unsigned char Byte) {
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unsigned short Outlet;
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Outlet = (pState->NodeAxon)[HeadNode];
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while (Outlet) {
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if ((pState->NodePix)[Outlet] == Byte)
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return Outlet;
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Outlet = (pState->NodeNext)[Outlet];
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}
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return 0;
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}
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static int gif_NextCode(struct gif_state *pState, unsigned char *pPixelValueCur, unsigned char CodeBits) {
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unsigned short UpNode;
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unsigned short DownNode;
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/* start with the root node for last pixel chain */
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UpNode = *pPixelValueCur;
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if (pState->pIn == pState->pInEnd) {
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gif_AddCodeToBuffer(pState, UpNode, CodeBits);
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return 0;
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}
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*pPixelValueCur = pState->map[*pState->pIn++];
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/* Follow the string table and the data stream to the end of the longest string that has a code */
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while (0 != (DownNode = gif_FindPixelOutlet(pState, UpNode, *pPixelValueCur))) {
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UpNode = DownNode;
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if (pState->pIn == pState->pInEnd) {
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gif_AddCodeToBuffer(pState, UpNode, CodeBits);
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return 0;
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}
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*pPixelValueCur = pState->map[*pState->pIn++];
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}
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/* Submit 'UpNode' which is the code of the longest string */
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gif_AddCodeToBuffer(pState, UpNode, CodeBits);
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/* ... and extend the string by appending 'PixelValueCur' */
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/* Create a successor node for 'PixelValueCur' whose code is 'freecode' */
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(pState->NodePix)[pState->FreeCode] = *pPixelValueCur;
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(pState->NodeAxon)[pState->FreeCode] = (pState->NodeNext)[pState->FreeCode] = 0;
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/* ...and link it to the end of the chain emanating from fg_axon[UpNode]. */
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DownNode = (pState->NodeAxon)[UpNode];
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if (!DownNode) {
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(pState->NodeAxon)[UpNode] = pState->FreeCode;
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} else {
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while ((pState->NodeNext)[DownNode]) {
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DownNode = (pState->NodeNext)[DownNode];
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}
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(pState->NodeNext)[DownNode] = pState->FreeCode;
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}
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return 1;
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}
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static int gif_lzw(struct gif_state *pState, int paletteBitSize) {
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unsigned char PixelValueCur;
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unsigned char CodeBits;
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unsigned short Pos;
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/* > Get first data byte */
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if (pState->pIn == pState->pInEnd)
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return 0;
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PixelValueCur = pState->map[*pState->pIn++];
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/* Number of bits per data item (=pixel)
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* We need at least a value of 2, otherwise the cc and eoi code consumes
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* the whole string table
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*/
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if (paletteBitSize == 1)
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paletteBitSize = 2;
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/* initial size of compression codes */
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CodeBits = paletteBitSize + 1;
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pState->ClearCode = (1 << paletteBitSize);
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pState->FreeCode = pState->ClearCode + 2;
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pState->OutBitsFree = 8;
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pState->OutPosCur = 0;
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pState->fByteCountByteSet = 0;
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for (Pos = 0; Pos < pState->ClearCode; Pos++)
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(pState->NodePix)[Pos] = (unsigned char) Pos;
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gif_FlushStringTable(pState);
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/* Write what the GIF specification calls the "code size". */
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(pState->pOut)[pState->OutPosCur] = paletteBitSize;
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/* Reserve first bytecount byte */
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gif_BufferNextByte(pState);
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pState->OutByteCountPos = pState->OutPosCur;
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gif_BufferNextByte(pState);
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pState->fByteCountByteSet = 1;
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/* Submit one 'ClearCode' as the first code */
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gif_AddCodeToBuffer(pState, pState->ClearCode, CodeBits);
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for (;;) {
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/* generate and save the next code, which may consist of multiple input pixels. */
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if (!gif_NextCode(pState, &PixelValueCur, CodeBits)) { /* Check for end of data stream */
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/* submit 'eoi' as the last item of the code stream */
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gif_AddCodeToBuffer(pState, (unsigned short) (pState->ClearCode + 1), CodeBits);
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pState->fByteCountByteSet = 0;
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if (pState->OutBitsFree < 8) {
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gif_BufferNextByte(pState);
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}
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/* > Update last bytecount byte; */
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if (pState->OutByteCountPos < pState->OutPosCur) {
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(pState->pOut)[pState->OutByteCountPos]
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= (unsigned char) (pState->OutPosCur - pState->OutByteCountPos - 1);
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}
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pState->OutPosCur++;
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return 1;
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}
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/* Check for currently last code */
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if (pState->FreeCode == (1U << CodeBits))
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CodeBits++;
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pState->FreeCode++;
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/* Check for full stringtable - for widest compatibility with gif decoders, empty when 0xfff, not 0x1000 */
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if (pState->FreeCode == 0xfff) {
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gif_FlushStringTable(pState);
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gif_AddCodeToBuffer(pState, pState->ClearCode, CodeBits);
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CodeBits = (unsigned char) (1 + paletteBitSize);
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pState->FreeCode = (unsigned short) (pState->ClearCode + 2);
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}
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}
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}
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/*
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* Called function to save in gif format
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*/
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INTERNAL int gif_pixel_plot(struct zint_symbol *symbol, unsigned char *pixelbuf) {
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struct filemem fm;
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unsigned char outbuf[10];
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unsigned char paletteRGB[10][3];
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int paletteCount, i;
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int paletteBitSize;
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int paletteSize;
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struct gif_state State;
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int transparent_index;
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int bgindex = -1, fgindex = -1;
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static const unsigned char RGBUnused[3] = {0,0,0};
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unsigned char RGBfg[3];
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unsigned char RGBbg[3];
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unsigned char fgalpha;
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unsigned char bgalpha;
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const size_t bitmapSize = (size_t) symbol->bitmap_height * symbol->bitmap_width;
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(void) out_colour_get_rgb(symbol->fgcolour, &RGBfg[0], &RGBfg[1], &RGBfg[2], &fgalpha);
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(void) out_colour_get_rgb(symbol->bgcolour, &RGBbg[0], &RGBbg[1], &RGBbg[2], &bgalpha);
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/* prepare state array */
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State.pIn = pixelbuf;
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State.pInEnd = pixelbuf + bitmapSize;
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/* Allow for overhead of 4 == code size + byte count + overflow byte + zero terminator */
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State.OutLength = bitmapSize + 4;
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State.fOutPaged = State.OutLength > GIF_LZW_PAGE_SIZE;
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if (State.fOutPaged) {
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State.OutLength = GIF_LZW_PAGE_SIZE;
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}
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if (!(State.pOut = (unsigned char *) malloc(State.OutLength))) {
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strcpy(symbol->errtxt, "614: Insufficient memory for LZW buffer");
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return ZINT_ERROR_MEMORY;
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}
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State.fmp = &fm;
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/* Open output file in binary mode */
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if (!fm_open(State.fmp, symbol, "wb")) {
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sprintf(symbol->errtxt, "611: Could not open output file (%d: %.30s)", State.fmp->err,
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strerror(State.fmp->err));
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free(State.pOut);
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return ZINT_ERROR_FILE_ACCESS;
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}
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/*
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* Build a table of the used palette items.
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* Currently, there are the following 10 colour codes:
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* '0': standard background
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* '1': standard foreground
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* 'W': white
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* 'C': cyan
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* 'B': blue
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* 'M': magenta
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* 'R': red
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* 'Y': yellow
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* 'G': green
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* 'K': black
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* '0' and '1' may be identical to one of the other values
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*/
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memset(State.map, 0, sizeof(State.map));
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if (symbol->symbology == BARCODE_ULTRA) {
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static const unsigned char ultra_chars[8] = { 'W', 'C', 'B', 'M', 'R', 'Y', 'G', 'K' };
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for (i = 0; i < 8; i++) {
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State.map[ultra_chars[i]] = i;
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out_colour_char_to_rgb(ultra_chars[i], &paletteRGB[i][0], &paletteRGB[i][1], &paletteRGB[i][2]);
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}
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paletteCount = 8;
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paletteBitSize = 3;
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/* For Ultracode, have foreground only if have bind/box */
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if (symbol->border_width > 0 && (symbol->output_options & (BARCODE_BIND | BARCODE_BOX | BARCODE_BIND_TOP))) {
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/* Check whether can re-use black */
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if (RGBfg[0] == 0 && RGBfg[1] == 0 && RGBfg[2] == 0) {
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State.map['1'] = fgindex = 7; /* Re-use black */
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} else {
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State.map['1'] = fgindex = paletteCount;
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memcpy(paletteRGB[paletteCount++], RGBfg, 3);
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paletteBitSize = 4;
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}
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}
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/* For Ultracode, have background only if have whitespace/quiet zones */
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if (symbol->whitespace_width > 0 || symbol->whitespace_height > 0
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|| ((symbol->output_options & BARCODE_QUIET_ZONES)
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&& !(symbol->output_options & BARCODE_NO_QUIET_ZONES))) {
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/* Check whether can re-use white */
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if (RGBbg[0] == 0xff && RGBbg[1] == 0xff && RGBbg[2] == 0xff && bgalpha == fgalpha) {
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State.map['0'] = bgindex = 0; /* Re-use white */
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} else {
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State.map['0'] = bgindex = paletteCount;
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memcpy(paletteRGB[paletteCount++], RGBbg, 3);
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paletteBitSize = 4;
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}
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}
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} else {
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State.map['0'] = bgindex = 0;
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memcpy(paletteRGB[bgindex], RGBbg, 3);
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State.map['1'] = fgindex = 1;
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memcpy(paletteRGB[fgindex], RGBfg, 3);
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paletteCount = 2;
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paletteBitSize = 1;
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}
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/* Set transparency */
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/* Note: does not allow both transparent foreground and background -
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* background takes priority */
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transparent_index = -1;
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if (bgalpha == 0 && bgindex != -1) {
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/* Transparent background */
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transparent_index = bgindex;
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} else if (fgalpha == 0 && fgindex != -1) {
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/* Transparent foreground */
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transparent_index = fgindex;
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}
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/* palette size 2 ^ bit size */
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paletteSize = 1 << paletteBitSize;
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/* GIF signature (6) */
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fm_write(transparent_index == -1 ? "GIF87a" : "GIF89a", 1, 6, State.fmp);
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/* Screen Descriptor (7) */
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/* Screen Width */
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outbuf[0] = (unsigned char) (0xff & symbol->bitmap_width);
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outbuf[1] = (unsigned char) (0xff & (symbol->bitmap_width >> 8));
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/* Screen Height */
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outbuf[2] = (unsigned char) (0xff & symbol->bitmap_height);
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outbuf[3] = (unsigned char) (0xff & (symbol->bitmap_height >> 8));
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/* write ImageBits-1 to the three least significant bits of byte 5 of
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* the Screen Descriptor
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* Bits 76543210
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* 1 : Global colour map
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* 111 : 8 bit colour depth of the palette
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* 0 : Not ordered in decreasing importance
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* xxx : palette bit size - 1
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*/
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outbuf[4] = (unsigned char) (0xf0 | (0x7 & (paletteBitSize - 1)));
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/*
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* Background colour index
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* Default to 0. If colour code 0 or K is present, it is used as index
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*/
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outbuf[5] = bgindex == -1 ? 0 : bgindex;
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/* Byte 7 must be 0x00 */
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outbuf[6] = 0x00;
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fm_write(outbuf, 1, 7, State.fmp);
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/* Global Color Table (paletteSize*3) */
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fm_write(paletteRGB, 1, 3*paletteCount, State.fmp);
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/* add unused palette items to fill palette size */
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for (i = paletteCount; i < paletteSize; i++) {
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fm_write(RGBUnused, 1, 3, State.fmp);
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}
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/* Graphic control extension (8) */
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/* A graphic control extension block is used for overlay gifs.
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* This is necessary to define a transparent color.
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*/
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if (transparent_index != -1) {
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/* Extension Introducer = '!' */
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outbuf[0] = '\x21';
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/* Graphic Control Label */
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outbuf[1] = '\xf9';
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/* Block Size */
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outbuf[2] = 4;
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/* Packet fields:
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* 3 Reserved
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* 3 Disposal Method: 0 No Action, 1 No Dispose, 2: Background, 3: Prev.
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* 1 User Input Flag: 0: no user input, 1: user input
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* 1 Transparent Color Flag: 0: No Transparency, 1: Transparency index
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*/
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outbuf[3] = 1;
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/* Delay Time */
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outbuf[4] = 0;
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outbuf[5] = 0;
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/* Transparent Color Index */
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outbuf[6] = (unsigned char) transparent_index;
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/* Block Terminator */
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outbuf[7] = 0;
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fm_write(outbuf, 1, 8, State.fmp);
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}
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/* Image Descriptor */
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/* Image separator character = ',' */
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outbuf[0] = 0x2c;
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/* "Image Left" */
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outbuf[1] = 0x00;
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outbuf[2] = 0x00;
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/* "Image Top" */
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outbuf[3] = 0x00;
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outbuf[4] = 0x00;
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/* Image Width (low byte first) */
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outbuf[5] = (unsigned char) (0xff & symbol->bitmap_width);
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outbuf[6] = (unsigned char) (0xff & (symbol->bitmap_width >> 8));
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/* Image Height */
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outbuf[7] = (unsigned char) (0xff & symbol->bitmap_height);
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outbuf[8] = (unsigned char) (0xff & (symbol->bitmap_height >> 8));
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/* Byte 10 contains the interlaced flag and
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* information on the local color table.
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* There is no local color table if its most significant bit is reset.
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*/
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outbuf[9] = 0x00;
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fm_write(outbuf, 1, 10, State.fmp);
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/* call lzw encoding */
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if (!gif_lzw(&State, paletteBitSize)) {
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free(State.pOut);
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(void) fm_close(State.fmp, symbol);
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strcpy(symbol->errtxt, "613: Insufficient memory for LZW buffer");
|
|
return ZINT_ERROR_MEMORY;
|
|
}
|
|
fm_write((const char *) State.pOut, 1, State.OutPosCur, State.fmp);
|
|
free(State.pOut);
|
|
|
|
/* GIF terminator */
|
|
fm_putc('\x3b', State.fmp);
|
|
|
|
if (fm_error(State.fmp)) {
|
|
sprintf(symbol->errtxt, "615: Incomplete write to output (%d: %.30s)", State.fmp->err,
|
|
strerror(State.fmp->err));
|
|
(void) fm_close(State.fmp, symbol);
|
|
return ZINT_ERROR_FILE_WRITE;
|
|
}
|
|
|
|
if (!fm_close(State.fmp, symbol)) {
|
|
sprintf(symbol->errtxt, "617: Failure on closing output file (%d: %.30s)", State.fmp->err,
|
|
strerror(State.fmp->err));
|
|
return ZINT_ERROR_FILE_WRITE;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* vim: set ts=4 sw=4 et : */
|