580 lines
18 KiB
C++
580 lines
18 KiB
C++
/****************************************************************************
|
|
**
|
|
** Copyright (C) 2016 The Qt Company Ltd.
|
|
** Contact: https://www.qt.io/licensing/
|
|
**
|
|
** This file is part of the QtGui module of the Qt Toolkit.
|
|
**
|
|
** $QT_BEGIN_LICENSE:LGPL$
|
|
** Commercial License Usage
|
|
** Licensees holding valid commercial Qt licenses may use this file in
|
|
** accordance with the commercial license agreement provided with the
|
|
** Software or, alternatively, in accordance with the terms contained in
|
|
** a written agreement between you and The Qt Company. For licensing terms
|
|
** and conditions see https://www.qt.io/terms-conditions. For further
|
|
** information use the contact form at https://www.qt.io/contact-us.
|
|
**
|
|
** GNU Lesser General Public License Usage
|
|
** Alternatively, this file may be used under the terms of the GNU Lesser
|
|
** General Public License version 3 as published by the Free Software
|
|
** Foundation and appearing in the file LICENSE.LGPL3 included in the
|
|
** packaging of this file. Please review the following information to
|
|
** ensure the GNU Lesser General Public License version 3 requirements
|
|
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
|
|
**
|
|
** GNU General Public License Usage
|
|
** Alternatively, this file may be used under the terms of the GNU
|
|
** General Public License version 2.0 or (at your option) the GNU General
|
|
** Public license version 3 or any later version approved by the KDE Free
|
|
** Qt Foundation. The licenses are as published by the Free Software
|
|
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
|
|
** included in the packaging of this file. Please review the following
|
|
** information to ensure the GNU General Public License requirements will
|
|
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
|
|
** https://www.gnu.org/licenses/gpl-3.0.html.
|
|
**
|
|
** $QT_END_LICENSE$
|
|
**
|
|
****************************************************************************/
|
|
|
|
#include "private/qppmhandler_p.h"
|
|
|
|
#ifndef QT_NO_IMAGEFORMAT_PPM
|
|
|
|
#include <qimage.h>
|
|
#include <qvariant.h>
|
|
#include <qvector.h>
|
|
#include <ctype.h>
|
|
#include <qrgba64.h>
|
|
|
|
QT_BEGIN_NAMESPACE
|
|
|
|
/*****************************************************************************
|
|
PBM/PGM/PPM (ASCII and RAW) image read/write functions
|
|
*****************************************************************************/
|
|
|
|
static void discard_pbm_line(QIODevice *d)
|
|
{
|
|
const int buflen = 100;
|
|
char buf[buflen];
|
|
int res = 0;
|
|
do {
|
|
res = d->readLine(buf, buflen);
|
|
} while (res > 0 && buf[res-1] != '\n');
|
|
}
|
|
|
|
static int read_pbm_int(QIODevice *d)
|
|
{
|
|
char c;
|
|
int val = -1;
|
|
bool digit;
|
|
for (;;) {
|
|
if (!d->getChar(&c)) // end of file
|
|
break;
|
|
digit = isdigit((uchar) c);
|
|
if (val != -1) {
|
|
if (digit) {
|
|
val = 10*val + c - '0';
|
|
continue;
|
|
} else {
|
|
if (c == '#') // comment
|
|
discard_pbm_line(d);
|
|
break;
|
|
}
|
|
}
|
|
if (digit) // first digit
|
|
val = c - '0';
|
|
else if (isspace((uchar) c))
|
|
continue;
|
|
else if (c == '#')
|
|
discard_pbm_line(d);
|
|
else
|
|
break;
|
|
}
|
|
return val;
|
|
}
|
|
|
|
static bool read_pbm_header(QIODevice *device, char& type, int& w, int& h, int& mcc)
|
|
{
|
|
char buf[3];
|
|
if (device->read(buf, 3) != 3) // read P[1-6]<white-space>
|
|
return false;
|
|
|
|
if (!(buf[0] == 'P' && isdigit((uchar) buf[1]) && isspace((uchar) buf[2])))
|
|
return false;
|
|
|
|
type = buf[1];
|
|
if (type < '1' || type > '6')
|
|
return false;
|
|
|
|
w = read_pbm_int(device); // get image width
|
|
h = read_pbm_int(device); // get image height
|
|
|
|
if (type == '1' || type == '4')
|
|
mcc = 1; // ignore max color component
|
|
else
|
|
mcc = read_pbm_int(device); // get max color component
|
|
|
|
if (w <= 0 || w > 32767 || h <= 0 || h > 32767 || mcc <= 0)
|
|
return false; // weird P.M image
|
|
|
|
return true;
|
|
}
|
|
|
|
static inline QRgb scale_pbm_color(quint16 mx, quint16 rv, quint16 gv, quint16 bv)
|
|
{
|
|
return QRgba64::fromRgba64((rv * 0xffff) / mx, (gv * 0xffff) / mx, (bv * 0xffff) / mx, 0xffff).toArgb32();
|
|
}
|
|
|
|
static bool read_pbm_body(QIODevice *device, char type, int w, int h, int mcc, QImage *outImage)
|
|
{
|
|
int nbits, y;
|
|
int pbm_bpl;
|
|
bool raw;
|
|
|
|
QImage::Format format;
|
|
switch (type) {
|
|
case '1': // ascii PBM
|
|
case '4': // raw PBM
|
|
nbits = 1;
|
|
format = QImage::Format_Mono;
|
|
break;
|
|
case '2': // ascii PGM
|
|
case '5': // raw PGM
|
|
nbits = 8;
|
|
format = QImage::Format_Grayscale8;
|
|
break;
|
|
case '3': // ascii PPM
|
|
case '6': // raw PPM
|
|
nbits = 32;
|
|
format = QImage::Format_RGB32;
|
|
break;
|
|
default:
|
|
return false;
|
|
}
|
|
raw = type >= '4';
|
|
|
|
if (outImage->size() != QSize(w, h) || outImage->format() != format) {
|
|
*outImage = QImage(w, h, format);
|
|
if (outImage->isNull())
|
|
return false;
|
|
}
|
|
|
|
pbm_bpl = (nbits*w+7)/8; // bytes per scanline in PBM
|
|
|
|
if (raw) { // read raw data
|
|
if (nbits == 32) { // type 6
|
|
pbm_bpl = mcc < 256 ? 3*w : 6*w;
|
|
uchar *buf24 = new uchar[pbm_bpl], *b;
|
|
QRgb *p;
|
|
QRgb *end;
|
|
for (y=0; y<h; y++) {
|
|
if (device->read((char *)buf24, pbm_bpl) != pbm_bpl) {
|
|
delete[] buf24;
|
|
return false;
|
|
}
|
|
p = (QRgb *)outImage->scanLine(y);
|
|
end = p + w;
|
|
b = buf24;
|
|
while (p < end) {
|
|
if (mcc < 256) {
|
|
if (mcc == 255)
|
|
*p++ = qRgb(b[0],b[1],b[2]);
|
|
else
|
|
*p++ = scale_pbm_color(mcc, b[0], b[1], b[2]);
|
|
b += 3;
|
|
} else {
|
|
quint16 rv = b[0] << 8 | b[1];
|
|
quint16 gv = b[2] << 8 | b[3];
|
|
quint16 bv = b[4] << 8 | b[5];
|
|
if (mcc == 0xffff)
|
|
*p++ = QRgba64::fromRgba64(rv, gv, bv, 0xffff).toArgb32();
|
|
else
|
|
*p++ = scale_pbm_color(mcc, rv, gv, bv);
|
|
b += 6;
|
|
}
|
|
}
|
|
}
|
|
delete[] buf24;
|
|
} else if (nbits == 8 && mcc > 255) { // type 5 16bit
|
|
pbm_bpl = 2*w;
|
|
uchar *buf16 = new uchar[pbm_bpl];
|
|
for (y=0; y<h; y++) {
|
|
if (device->read((char *)buf16, pbm_bpl) != pbm_bpl) {
|
|
delete[] buf16;
|
|
return false;
|
|
}
|
|
uchar *p = outImage->scanLine(y);
|
|
uchar *end = p + w;
|
|
uchar *b = buf16;
|
|
while (p < end) {
|
|
*p++ = (b[0] << 8 | b[1]) * 255 / mcc;
|
|
b += 2;
|
|
}
|
|
}
|
|
delete[] buf16;
|
|
} else { // type 4,5
|
|
for (y=0; y<h; y++) {
|
|
uchar *p = outImage->scanLine(y);
|
|
if (device->read((char *)p, pbm_bpl) != pbm_bpl)
|
|
return false;
|
|
if (nbits == 8 && mcc < 255) {
|
|
for (int i = 0; i < pbm_bpl; i++)
|
|
p[i] = (p[i] * 255) / mcc;
|
|
}
|
|
}
|
|
}
|
|
} else { // read ascii data
|
|
uchar *p;
|
|
int n;
|
|
char buf;
|
|
for (y = 0; (y < h) && (device->peek(&buf, 1) == 1); y++) {
|
|
p = outImage->scanLine(y);
|
|
n = pbm_bpl;
|
|
if (nbits == 1) {
|
|
int b;
|
|
int bitsLeft = w;
|
|
while (n--) {
|
|
b = 0;
|
|
for (int i=0; i<8; i++) {
|
|
if (i < bitsLeft)
|
|
b = (b << 1) | (read_pbm_int(device) & 1);
|
|
else
|
|
b = (b << 1) | (0 & 1); // pad it our self if we need to
|
|
}
|
|
bitsLeft -= 8;
|
|
*p++ = b;
|
|
}
|
|
} else if (nbits == 8) {
|
|
if (mcc == 255) {
|
|
while (n--) {
|
|
*p++ = read_pbm_int(device);
|
|
}
|
|
} else {
|
|
while (n--) {
|
|
*p++ = read_pbm_int(device) * 255 / mcc;
|
|
}
|
|
}
|
|
} else { // 32 bits
|
|
n /= 4;
|
|
int r, g, b;
|
|
if (mcc == 255) {
|
|
while (n--) {
|
|
r = read_pbm_int(device);
|
|
g = read_pbm_int(device);
|
|
b = read_pbm_int(device);
|
|
*((QRgb*)p) = qRgb(r, g, b);
|
|
p += 4;
|
|
}
|
|
} else {
|
|
while (n--) {
|
|
r = read_pbm_int(device);
|
|
g = read_pbm_int(device);
|
|
b = read_pbm_int(device);
|
|
*((QRgb*)p) = scale_pbm_color(mcc, r, g, b);
|
|
p += 4;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (format == QImage::Format_Mono) {
|
|
outImage->setColorCount(2);
|
|
outImage->setColor(0, qRgb(255,255,255)); // white
|
|
outImage->setColor(1, qRgb(0,0,0)); // black
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool write_pbm_image(QIODevice *out, const QImage &sourceImage, const QByteArray &sourceFormat)
|
|
{
|
|
QByteArray str;
|
|
QImage image = sourceImage;
|
|
QByteArray format = sourceFormat;
|
|
|
|
format = format.left(3); // ignore RAW part
|
|
bool gray = format == "pgm";
|
|
|
|
if (format == "pbm") {
|
|
image = image.convertToFormat(QImage::Format_Mono);
|
|
} else if (gray) {
|
|
image = image.convertToFormat(QImage::Format_Grayscale8);
|
|
} else {
|
|
switch (image.format()) {
|
|
case QImage::Format_Mono:
|
|
case QImage::Format_MonoLSB:
|
|
image = image.convertToFormat(QImage::Format_Indexed8);
|
|
break;
|
|
case QImage::Format_Indexed8:
|
|
case QImage::Format_RGB32:
|
|
case QImage::Format_ARGB32:
|
|
break;
|
|
default:
|
|
if (image.hasAlphaChannel())
|
|
image = image.convertToFormat(QImage::Format_ARGB32);
|
|
else
|
|
image = image.convertToFormat(QImage::Format_RGB32);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (image.depth() == 1 && image.colorCount() == 2) {
|
|
if (qGray(image.color(0)) < qGray(image.color(1))) {
|
|
// 0=dark/black, 1=light/white - invert
|
|
image.detach();
|
|
for (int y=0; y<image.height(); y++) {
|
|
uchar *p = image.scanLine(y);
|
|
uchar *end = p + image.bytesPerLine();
|
|
while (p < end)
|
|
*p++ ^= 0xff;
|
|
}
|
|
}
|
|
}
|
|
|
|
uint w = image.width();
|
|
uint h = image.height();
|
|
|
|
str = "P\n";
|
|
str += QByteArray::number(w);
|
|
str += ' ';
|
|
str += QByteArray::number(h);
|
|
str += '\n';
|
|
|
|
switch (image.depth()) {
|
|
case 1: {
|
|
str.insert(1, '4');
|
|
if (out->write(str, str.length()) != str.length())
|
|
return false;
|
|
w = (w+7)/8;
|
|
for (uint y=0; y<h; y++) {
|
|
uchar* line = image.scanLine(y);
|
|
if (w != (uint)out->write((char*)line, w))
|
|
return false;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case 8: {
|
|
str.insert(1, gray ? '5' : '6');
|
|
str.append("255\n");
|
|
if (out->write(str, str.length()) != str.length())
|
|
return false;
|
|
uint bpl = w * (gray ? 1 : 3);
|
|
uchar *buf = new uchar[bpl];
|
|
if (image.format() == QImage::Format_Indexed8) {
|
|
QVector<QRgb> color = image.colorTable();
|
|
for (uint y=0; y<h; y++) {
|
|
const uchar *b = image.constScanLine(y);
|
|
uchar *p = buf;
|
|
uchar *end = buf+bpl;
|
|
if (gray) {
|
|
while (p < end) {
|
|
uchar g = (uchar)qGray(color[*b++]);
|
|
*p++ = g;
|
|
}
|
|
} else {
|
|
while (p < end) {
|
|
QRgb rgb = color[*b++];
|
|
*p++ = qRed(rgb);
|
|
*p++ = qGreen(rgb);
|
|
*p++ = qBlue(rgb);
|
|
}
|
|
}
|
|
if (bpl != (uint)out->write((char*)buf, bpl))
|
|
return false;
|
|
}
|
|
} else {
|
|
for (uint y=0; y<h; y++) {
|
|
const uchar *b = image.constScanLine(y);
|
|
uchar *p = buf;
|
|
uchar *end = buf + bpl;
|
|
if (gray) {
|
|
while (p < end)
|
|
*p++ = *b++;
|
|
} else {
|
|
while (p < end) {
|
|
uchar color = *b++;
|
|
*p++ = color;
|
|
*p++ = color;
|
|
*p++ = color;
|
|
}
|
|
}
|
|
if (bpl != (uint)out->write((char*)buf, bpl))
|
|
return false;
|
|
}
|
|
}
|
|
delete[] buf;
|
|
break;
|
|
}
|
|
|
|
case 32: {
|
|
str.insert(1, '6');
|
|
str.append("255\n");
|
|
if (out->write(str, str.length()) != str.length())
|
|
return false;
|
|
uint bpl = w * 3;
|
|
uchar *buf = new uchar[bpl];
|
|
for (uint y=0; y<h; y++) {
|
|
const QRgb *b = reinterpret_cast<const QRgb *>(image.constScanLine(y));
|
|
uchar *p = buf;
|
|
uchar *end = buf+bpl;
|
|
while (p < end) {
|
|
QRgb rgb = *b++;
|
|
*p++ = qRed(rgb);
|
|
*p++ = qGreen(rgb);
|
|
*p++ = qBlue(rgb);
|
|
}
|
|
if (bpl != (uint)out->write((char*)buf, bpl))
|
|
return false;
|
|
}
|
|
delete[] buf;
|
|
break;
|
|
}
|
|
|
|
default:
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
QPpmHandler::QPpmHandler()
|
|
: state(Ready)
|
|
{}
|
|
|
|
bool QPpmHandler::readHeader()
|
|
{
|
|
state = Error;
|
|
if (!read_pbm_header(device(), type, width, height, mcc))
|
|
return false;
|
|
state = ReadHeader;
|
|
return true;
|
|
}
|
|
|
|
bool QPpmHandler::canRead() const
|
|
{
|
|
if (state == Ready && !canRead(device(), &subType))
|
|
return false;
|
|
|
|
if (state != Error) {
|
|
setFormat(subType);
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
bool QPpmHandler::canRead(QIODevice *device, QByteArray *subType)
|
|
{
|
|
if (!device) {
|
|
qWarning("QPpmHandler::canRead() called with no device");
|
|
return false;
|
|
}
|
|
|
|
char head[2];
|
|
if (device->peek(head, sizeof(head)) != sizeof(head))
|
|
return false;
|
|
|
|
if (head[0] != 'P')
|
|
return false;
|
|
|
|
if (head[1] == '1' || head[1] == '4') {
|
|
if (subType)
|
|
*subType = "pbm";
|
|
} else if (head[1] == '2' || head[1] == '5') {
|
|
if (subType)
|
|
*subType = "pgm";
|
|
} else if (head[1] == '3' || head[1] == '6') {
|
|
if (subType)
|
|
*subType = "ppm";
|
|
} else {
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool QPpmHandler::read(QImage *image)
|
|
{
|
|
if (state == Error)
|
|
return false;
|
|
|
|
if (state == Ready && !readHeader()) {
|
|
state = Error;
|
|
return false;
|
|
}
|
|
|
|
if (!read_pbm_body(device(), type, width, height, mcc, image)) {
|
|
state = Error;
|
|
return false;
|
|
}
|
|
|
|
state = Ready;
|
|
return true;
|
|
}
|
|
|
|
bool QPpmHandler::write(const QImage &image)
|
|
{
|
|
return write_pbm_image(device(), image, subType);
|
|
}
|
|
|
|
bool QPpmHandler::supportsOption(ImageOption option) const
|
|
{
|
|
return option == SubType
|
|
|| option == Size
|
|
|| option == ImageFormat;
|
|
}
|
|
|
|
QVariant QPpmHandler::option(ImageOption option) const
|
|
{
|
|
if (option == SubType) {
|
|
return subType;
|
|
} else if (option == Size) {
|
|
if (state == Error)
|
|
return QVariant();
|
|
if (state == Ready && !const_cast<QPpmHandler*>(this)->readHeader())
|
|
return QVariant();
|
|
return QSize(width, height);
|
|
} else if (option == ImageFormat) {
|
|
if (state == Error)
|
|
return QVariant();
|
|
if (state == Ready && !const_cast<QPpmHandler*>(this)->readHeader())
|
|
return QVariant();
|
|
QImage::Format format = QImage::Format_Invalid;
|
|
switch (type) {
|
|
case '1': // ascii PBM
|
|
case '4': // raw PBM
|
|
format = QImage::Format_Mono;
|
|
break;
|
|
case '2': // ascii PGM
|
|
case '5': // raw PGM
|
|
format = QImage::Format_Grayscale8;
|
|
break;
|
|
case '3': // ascii PPM
|
|
case '6': // raw PPM
|
|
format = QImage::Format_RGB32;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
return format;
|
|
}
|
|
return QVariant();
|
|
}
|
|
|
|
void QPpmHandler::setOption(ImageOption option, const QVariant &value)
|
|
{
|
|
if (option == SubType)
|
|
subType = value.toByteArray().toLower();
|
|
}
|
|
|
|
QByteArray QPpmHandler::name() const
|
|
{
|
|
return subType.isEmpty() ? QByteArray("ppm") : subType;
|
|
}
|
|
|
|
QT_END_NAMESPACE
|
|
|
|
#endif // QT_NO_IMAGEFORMAT_PPM
|