diff options
| -rw-r--r-- | src/plugins/imageformats/jpeg/qjpeghandler.cpp | 467 |
1 files changed, 238 insertions, 229 deletions
diff --git a/src/plugins/imageformats/jpeg/qjpeghandler.cpp b/src/plugins/imageformats/jpeg/qjpeghandler.cpp index 3b23e56..d51668a 100644 --- a/src/plugins/imageformats/jpeg/qjpeghandler.cpp +++ b/src/plugins/imageformats/jpeg/qjpeghandler.cpp @@ -196,52 +196,52 @@ inline QRgb *QImageSmoothScaler::scanLine(const int line, const QImage *src) QImage QImageSmoothScaler::scale() { - long SCALE; - long HALFSCALE; - QRgb *xelrow = 0; - QRgb *tempxelrow = 0; - QRgb *xP; - QRgb *nxP; - int row, rowsread; - int col, needtoreadrow; - uchar maxval = 255; - qreal xscale, yscale; - long sxscale, syscale; - long fracrowtofill, fracrowleft; - long *as; - long *rs; - long *gs; - long *bs; - int rowswritten = 0; - QImage dst; + long SCALE; + long HALFSCALE; + QRgb *xelrow = 0; + QRgb *tempxelrow = 0; + QRgb *xP; + QRgb *nxP; + int row, rowsread; + int col, needtoreadrow; + uchar maxval = 255; + qreal xscale, yscale; + long sxscale, syscale; + long fracrowtofill, fracrowleft; + long *as; + long *rs; + long *gs; + long *bs; + int rowswritten = 0; + QImage dst; if (d->cols > 4096) { - SCALE = 4096; - HALFSCALE = 2048; + SCALE = 4096; + HALFSCALE = 2048; } else { - int fac = 4096; - while (d->cols * fac > 4096) { - fac /= 2; - } + int fac = 4096; + while (d->cols * fac > 4096) + fac /= 2; - SCALE = fac * d->cols; - HALFSCALE = fac * d->cols / 2; + SCALE = fac * d->cols; + HALFSCALE = fac * d->cols / 2; } - xscale = (qreal) d->newcols / (qreal) d->cols; - yscale = (qreal) d->newrows / (qreal) d->rows; + xscale = (qreal)d->newcols / (qreal)d->cols; + yscale = (qreal)d->newrows / (qreal)d->rows; sxscale = (long)(xscale * SCALE); syscale = (long)(yscale * SCALE); - if ( d->newrows != d->rows ) /* shortcut Y scaling if possible */ - tempxelrow = new QRgb[d->cols]; + // shortcut Y scaling if possible + if (d->newrows != d->rows) + tempxelrow = new QRgb[d->cols]; - if ( d->hasAlpha ) { - as = new long[d->cols]; - for ( col = 0; col < d->cols; ++col ) - as[col] = HALFSCALE; + if (d->hasAlpha) { + as = new long[d->cols]; + for (col = 0; col < d->cols; ++col) + as[col] = HALFSCALE; } else { - as = 0; + as = 0; } rs = new long[d->cols]; gs = new long[d->cols]; @@ -249,205 +249,214 @@ QImage QImageSmoothScaler::scale() rowsread = 0; fracrowleft = syscale; needtoreadrow = 1; - for ( col = 0; col < d->cols; ++col ) - rs[col] = gs[col] = bs[col] = HALFSCALE; + for (col = 0; col < d->cols; ++col) + rs[col] = gs[col] = bs[col] = HALFSCALE; fracrowtofill = SCALE; - dst = QImage( d->newcols, d->newrows, d->hasAlpha ? QImage::Format_ARGB32 : QImage::Format_RGB32 ); - - for ( row = 0; row < d->newrows; ++row ) { - /* First scale Y from xelrow into tempxelrow. */ - if ( d->newrows == d->rows ) { - /* shortcut Y scaling if possible */ - tempxelrow = xelrow = scanLine(rowsread++, d->src); - } else { - while ( fracrowleft < fracrowtofill ) { - if ( needtoreadrow && rowsread < d->rows ) { - xelrow = scanLine(rowsread++, d->src); - } - for ( col = 0, xP = xelrow; col < d->cols; ++col, ++xP ) { - if (as) { - as[col] += fracrowleft * qAlpha( *xP ); - rs[col] += fracrowleft * qRed( *xP ) * qAlpha( *xP ) / 255; - gs[col] += fracrowleft * qGreen( *xP ) * qAlpha( *xP ) / 255; - bs[col] += fracrowleft * qBlue( *xP ) * qAlpha( *xP ) / 255; - } else { - rs[col] += fracrowleft * qRed( *xP ); - gs[col] += fracrowleft * qGreen( *xP ); - bs[col] += fracrowleft * qBlue( *xP ); - } - } - fracrowtofill -= fracrowleft; - fracrowleft = syscale; - needtoreadrow = 1; - } - /* Now fracrowleft is >= fracrowtofill, so we can produce a row. */ - if ( needtoreadrow && rowsread < d->rows) { - xelrow = scanLine(rowsread++, d->src); - needtoreadrow = 0; - } - for ( col = 0, xP = xelrow, nxP = tempxelrow; - col < d->cols; ++col, ++xP, ++nxP ) - { - register long a, r, g, b; - - if ( as ) { - r = rs[col] + fracrowtofill * qRed( *xP ) * qAlpha( *xP ) / 255; - g = gs[col] + fracrowtofill * qGreen( *xP ) * qAlpha( *xP ) / 255; - b = bs[col] + fracrowtofill * qBlue( *xP ) * qAlpha( *xP ) / 255; - a = as[col] + fracrowtofill * qAlpha( *xP ); - if ( a ) { - r = r * 255 / a * SCALE; - g = g * 255 / a * SCALE; - b = b * 255 / a * SCALE; - } - } else { - r = rs[col] + fracrowtofill * qRed( *xP ); - g = gs[col] + fracrowtofill * qGreen( *xP ); - b = bs[col] + fracrowtofill * qBlue( *xP ); - a = 0; // unwarn - } - r /= SCALE; - if ( r > maxval ) r = maxval; - g /= SCALE; - if ( g > maxval ) g = maxval; - b /= SCALE; - if ( b > maxval ) b = maxval; - if ( as ) { - a /= SCALE; - if ( a > maxval ) a = maxval; - *nxP = qRgba( (int)r, (int)g, (int)b, (int)a ); - as[col] = HALFSCALE; - } else { - *nxP = qRgb( (int)r, (int)g, (int)b ); - } - rs[col] = gs[col] = bs[col] = HALFSCALE; - } - fracrowleft -= fracrowtofill; - if ( fracrowleft == 0 ) { - fracrowleft = syscale; - needtoreadrow = 1; - } - fracrowtofill = SCALE; - } + dst = QImage(d->newcols, d->newrows, d->hasAlpha ? QImage::Format_ARGB32 : QImage::Format_RGB32); - /* Now scale X from tempxelrow into dst and write it out. */ - if ( d->newcols == d->cols ) { - /* shortcut X scaling if possible */ - memcpy(dst.scanLine(rowswritten++), tempxelrow, d->newcols*4); - } else { - register long a, r, g, b; - register long fraccoltofill, fraccolleft = 0; - register int needcol; - - nxP = (QRgb*)dst.scanLine(rowswritten++); - fraccoltofill = SCALE; - a = r = g = b = HALFSCALE; - needcol = 0; - for ( col = 0, xP = tempxelrow; col < d->cols; ++col, ++xP ) { - fraccolleft = sxscale; - while ( fraccolleft >= fraccoltofill ) { - if ( needcol ) { - ++nxP; - a = r = g = b = HALFSCALE; - } - if ( as ) { - r += fraccoltofill * qRed( *xP ) * qAlpha( *xP ) / 255; - g += fraccoltofill * qGreen( *xP ) * qAlpha( *xP ) / 255; - b += fraccoltofill * qBlue( *xP ) * qAlpha( *xP ) / 255; - a += fraccoltofill * qAlpha( *xP ); - if ( a ) { - r = r * 255 / a * SCALE; - g = g * 255 / a * SCALE; - b = b * 255 / a * SCALE; - } - } else { - r += fraccoltofill * qRed( *xP ); - g += fraccoltofill * qGreen( *xP ); - b += fraccoltofill * qBlue( *xP ); - } - r /= SCALE; - if ( r > maxval ) r = maxval; - g /= SCALE; - if ( g > maxval ) g = maxval; - b /= SCALE; - if ( b > maxval ) b = maxval; - if (as) { - a /= SCALE; - if ( a > maxval ) a = maxval; - *nxP = qRgba( (int)r, (int)g, (int)b, (int)a ); - } else { - *nxP = qRgb( (int)r, (int)g, (int)b ); - } - fraccolleft -= fraccoltofill; - fraccoltofill = SCALE; - needcol = 1; - } - if ( fraccolleft > 0 ) { - if ( needcol ) { - ++nxP; - a = r = g = b = HALFSCALE; - needcol = 0; - } - if (as) { - a += fraccolleft * qAlpha( *xP ); - r += fraccolleft * qRed( *xP ) * qAlpha( *xP ) / 255; - g += fraccolleft * qGreen( *xP ) * qAlpha( *xP ) / 255; - b += fraccolleft * qBlue( *xP ) * qAlpha( *xP ) / 255; - } else { - r += fraccolleft * qRed( *xP ); - g += fraccolleft * qGreen( *xP ); - b += fraccolleft * qBlue( *xP ); - } - fraccoltofill -= fraccolleft; - } - } - if ( fraccoltofill > 0 ) { - --xP; - if (as) { - a += fraccolleft * qAlpha( *xP ); - r += fraccoltofill * qRed( *xP ) * qAlpha( *xP ) / 255; - g += fraccoltofill * qGreen( *xP ) * qAlpha( *xP ) / 255; - b += fraccoltofill * qBlue( *xP ) * qAlpha( *xP ) / 255; - if ( a ) { - r = r * 255 / a * SCALE; - g = g * 255 / a * SCALE; - b = b * 255 / a * SCALE; - } - } else { - r += fraccoltofill * qRed( *xP ); - g += fraccoltofill * qGreen( *xP ); - b += fraccoltofill * qBlue( *xP ); - } - } - if ( ! needcol ) { - r /= SCALE; - if ( r > maxval ) r = maxval; - g /= SCALE; - if ( g > maxval ) g = maxval; - b /= SCALE; - if ( b > maxval ) b = maxval; - if (as) { - a /= SCALE; - if ( a > maxval ) a = maxval; - *nxP = qRgba( (int)r, (int)g, (int)b, (int)a ); - } else { - *nxP = qRgb( (int)r, (int)g, (int)b ); - } - } - } + for (row = 0; row < d->newrows; ++row) { + // First scale Y from xelrow into tempxelrow. + if (d->newrows == d->rows) { + // shortcut Y scaling if possible + tempxelrow = xelrow = scanLine(rowsread++, d->src); + } else { + while (fracrowleft < fracrowtofill) { + if (needtoreadrow && rowsread < d->rows) + xelrow = scanLine(rowsread++, d->src); + for (col = 0, xP = xelrow; col < d->cols; ++col, ++xP) { + if (as) { + as[col] += fracrowleft * qAlpha(*xP); + rs[col] += fracrowleft * qRed(*xP) * qAlpha(*xP) / 255; + gs[col] += fracrowleft * qGreen(*xP) * qAlpha(*xP) / 255; + bs[col] += fracrowleft * qBlue(*xP) * qAlpha(*xP) / 255; + } else { + rs[col] += fracrowleft * qRed(*xP); + gs[col] += fracrowleft * qGreen(*xP); + bs[col] += fracrowleft * qBlue(*xP); + } + } + fracrowtofill -= fracrowleft; + fracrowleft = syscale; + needtoreadrow = 1; + } + // Now fracrowleft is >= fracrowtofill, so we can produce a row. + if (needtoreadrow && rowsread < d->rows) { + xelrow = scanLine(rowsread++, d->src); + needtoreadrow = 0; + } + for (col = 0, xP = xelrow, nxP = tempxelrow; col < d->cols; ++col, ++xP, ++nxP) { + register long a, r, g, b; + + if (as) { + r = rs[col] + fracrowtofill * qRed(*xP) * qAlpha(*xP) / 255; + g = gs[col] + fracrowtofill * qGreen(*xP) * qAlpha(*xP) / 255; + b = bs[col] + fracrowtofill * qBlue(*xP) * qAlpha(*xP) / 255; + a = as[col] + fracrowtofill * qAlpha(*xP); + if (a) { + r = r * 255 / a * SCALE; + g = g * 255 / a * SCALE; + b = b * 255 / a * SCALE; + } + } else { + r = rs[col] + fracrowtofill * qRed(*xP); + g = gs[col] + fracrowtofill * qGreen(*xP); + b = bs[col] + fracrowtofill * qBlue(*xP); + a = 0; // unwarn + } + r /= SCALE; + if (r > maxval) + r = maxval; + g /= SCALE; + if (g > maxval) + g = maxval; + b /= SCALE; + if (b > maxval) + b = maxval; + if (as) { + a /= SCALE; + if (a > maxval) + a = maxval; + *nxP = qRgba((int)r, (int)g, (int)b, (int)a); + as[col] = HALFSCALE; + } else { + *nxP = qRgb((int)r, (int)g, (int)b); + } + rs[col] = gs[col] = bs[col] = HALFSCALE; + } + fracrowleft -= fracrowtofill; + if (fracrowleft == 0) { + fracrowleft = syscale; + needtoreadrow = 1; + } + fracrowtofill = SCALE; + } + + // Now scale X from tempxelrow into dst and write it out. + if (d->newcols == d->cols) { + // shortcut X scaling if possible + memcpy(dst.scanLine(rowswritten++), tempxelrow, d->newcols * 4); + } else { + register long a, r, g, b; + register long fraccoltofill, fraccolleft = 0; + register int needcol; + + nxP = (QRgb *)dst.scanLine(rowswritten++); + fraccoltofill = SCALE; + a = r = g = b = HALFSCALE; + needcol = 0; + for (col = 0, xP = tempxelrow; col < d->cols; ++col, ++xP) { + fraccolleft = sxscale; + while (fraccolleft >= fraccoltofill) { + if (needcol) { + ++nxP; + a = r = g = b = HALFSCALE; + } + if (as) { + r += fraccoltofill * qRed(*xP) * qAlpha(*xP) / 255; + g += fraccoltofill * qGreen(*xP) * qAlpha(*xP) / 255; + b += fraccoltofill * qBlue(*xP) * qAlpha(*xP) / 255; + a += fraccoltofill * qAlpha(*xP); + if (a) { + r = r * 255 / a * SCALE; + g = g * 255 / a * SCALE; + b = b * 255 / a * SCALE; + } + } else { + r += fraccoltofill * qRed(*xP); + g += fraccoltofill * qGreen(*xP); + b += fraccoltofill * qBlue(*xP); + } + r /= SCALE; + if (r > maxval) + r = maxval; + g /= SCALE; + if (g > maxval) + g = maxval; + b /= SCALE; + if (b > maxval) + b = maxval; + if (as) { + a /= SCALE; + if (a > maxval) + a = maxval; + *nxP = qRgba((int)r, (int)g, (int)b, (int)a); + } else { + *nxP = qRgb((int)r, (int)g, (int)b); + } + fraccolleft -= fraccoltofill; + fraccoltofill = SCALE; + needcol = 1; + } + if (fraccolleft > 0) { + if (needcol) { + ++nxP; + a = r = g = b = HALFSCALE; + needcol = 0; + } + if (as) { + a += fraccolleft * qAlpha(*xP); + r += fraccolleft * qRed(*xP) * qAlpha(*xP) / 255; + g += fraccolleft * qGreen(*xP) * qAlpha(*xP) / 255; + b += fraccolleft * qBlue(*xP) * qAlpha(*xP) / 255; + } else { + r += fraccolleft * qRed(*xP); + g += fraccolleft * qGreen(*xP); + b += fraccolleft * qBlue(*xP); + } + fraccoltofill -= fraccolleft; + } + } + if (fraccoltofill > 0) { + --xP; + if (as) { + a += fraccolleft * qAlpha(*xP); + r += fraccoltofill * qRed(*xP) * qAlpha(*xP) / 255; + g += fraccoltofill * qGreen(*xP) * qAlpha(*xP) / 255; + b += fraccoltofill * qBlue(*xP) * qAlpha(*xP) / 255; + if (a) { + r = r * 255 / a * SCALE; + g = g * 255 / a * SCALE; + b = b * 255 / a * SCALE; + } + } else { + r += fraccoltofill * qRed(*xP); + g += fraccoltofill * qGreen(*xP); + b += fraccoltofill * qBlue(*xP); + } + } + if (!needcol) { + r /= SCALE; + if (r > maxval) + r = maxval; + g /= SCALE; + if (g > maxval) + g = maxval; + b /= SCALE; + if (b > maxval) + b = maxval; + if (as) { + a /= SCALE; + if (a > maxval) + a = maxval; + *nxP = qRgba((int)r, (int)g, (int)b, (int)a); + } else { + *nxP = qRgb((int)r, (int)g, (int)b); + } + } + } } - if ( d->newrows != d->rows && tempxelrow )// Robust, tempxelrow might be 0 1 day - delete [] tempxelrow; - if ( as ) // Avoid purify complaint - delete [] as; - if ( rs ) // Robust, rs might be 0 one day - delete [] rs; - if ( gs ) // Robust, gs might be 0 one day - delete [] gs; - if ( bs ) // Robust, bs might be 0 one day - delete [] bs; + if (d->newrows != d->rows && tempxelrow)// Robust, tempxelrow might be 0 1 day + delete [] tempxelrow; + if (as) // Avoid purify complaint + delete [] as; + if (rs) // Robust, rs might be 0 one day + delete [] rs; + if (gs) // Robust, gs might be 0 one day + delete [] gs; + if (bs) // Robust, bs might be 0 one day + delete [] bs; return dst; } |