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-rw-r--r--src/plugins/imageformats/jpeg/qjpeghandler.cpp467
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;
}
generated by cgit v0.12 at 2024-11-25 12:28:02 (GMT)