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#ifndef QBLENDFUNCTIONS_P_H
#define QBLENDFUNCTIONS_P_H
#include <QtGui/private/qtguiglobal_p.h>
#include <qmath.h>
#include "qdrawhelper_p.h"
QT_BEGIN_NAMESPACE
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
template <typename SRC, typename T>
void qt_scale_image_16bit(uchar *destPixels, int dbpl,
const uchar *srcPixels, int sbpl, int srch,
const QRectF &targetRect,
const QRectF &srcRect,
const QRect &clip,
T blender)
{
qreal sx = targetRect.width() / (qreal) srcRect.width();
qreal sy = targetRect.height() / (qreal) srcRect.height();
int ix = 0x00010000 / sx;
int iy = 0x00010000 / sy;
// qDebug() << "scale:" << endl
// << " - target" << targetRect << endl
// << " - source" << srcRect << endl
// << " - clip" << clip << endl
// << " - sx=" << sx << " sy=" << sy << " ix=" << ix << " iy=" << iy;
int cx1 = clip.x();
int cx2 = clip.x() + clip.width();
int cy1 = clip.top();
int cy2 = clip.y() + clip.height();
int tx1 = qRound(targetRect.left());
int tx2 = qRound(targetRect.right());
int ty1 = qRound(targetRect.top());
int ty2 = qRound(targetRect.bottom());
if (tx2 < tx1)
qSwap(tx2, tx1);
if (ty2 < ty1)
qSwap(ty2, ty1);
if (tx1 < cx1)
tx1 = cx1;
if (tx2 >= cx2)
tx2 = cx2;
if (tx1 >= tx2)
return;
if (ty1 < cy1)
ty1 = cy1;
if (ty2 >= cy2)
ty2 = cy2;
if (ty1 >= ty2)
return;
int h = ty2 - ty1;
int w = tx2 - tx1;
quint32 basex;
quint32 srcy;
if (sx < 0) {
int dstx = qFloor((tx1 + qreal(0.5) - targetRect.right()) * ix) + 1;
basex = quint32(srcRect.right() * 65536) + dstx;
} else {
int dstx = qCeil((tx1 + qreal(0.5) - targetRect.left()) * ix) - 1;
basex = quint32(srcRect.left() * 65536) + dstx;
}
if (sy < 0) {
int dsty = qFloor((ty1 + qreal(0.5) - targetRect.bottom()) * iy) + 1;
srcy = quint32(srcRect.bottom() * 65536) + dsty;
} else {
int dsty = qCeil((ty1 + qreal(0.5) - targetRect.top()) * iy) - 1;
srcy = quint32(srcRect.top() * 65536) + dsty;
}
quint16 *dst = ((quint16 *) (destPixels + ty1 * dbpl)) + tx1;
// this bounds check here is required as floating point rounding above might in some cases lead to
// w/h values that are one pixel too large, falling outside of the valid image area.
const int ystart = srcy >> 16;
if (ystart >= srch && iy < 0) {
srcy += iy;
--h;
}
const int xstart = basex >> 16;
if (xstart >= (int)(sbpl/sizeof(SRC)) && ix < 0) {
basex += ix;
--w;
}
int yend = (srcy + iy * (h - 1)) >> 16;
if (yend < 0 || yend >= srch)
--h;
int xend = (basex + ix * (w - 1)) >> 16;
if (xend < 0 || xend >= (int)(sbpl/sizeof(SRC)))
--w;
while (h--) {
const SRC *src = (const SRC *) (srcPixels + (srcy >> 16) * sbpl);
quint32 srcx = basex;
int x = 0;
for (; x<w-7; x+=8) {
blender.write(&dst[x], src[srcx >> 16]); srcx += ix;
blender.write(&dst[x+1], src[srcx >> 16]); srcx += ix;
blender.write(&dst[x+2], src[srcx >> 16]); srcx += ix;
blender.write(&dst[x+3], src[srcx >> 16]); srcx += ix;
blender.write(&dst[x+4], src[srcx >> 16]); srcx += ix;
blender.write(&dst[x+5], src[srcx >> 16]); srcx += ix;
blender.write(&dst[x+6], src[srcx >> 16]); srcx += ix;
blender.write(&dst[x+7], src[srcx >> 16]); srcx += ix;
}
for (; x<w; ++x) {
blender.write(&dst[x], src[srcx >> 16]);
srcx += ix;
}
blender.flush(&dst[x]);
dst = (quint16 *)(((uchar *) dst) + dbpl);
srcy += iy;
}
}
template <typename T> void qt_scale_image_32bit(uchar *destPixels, int dbpl,
const uchar *srcPixels, int sbpl, int srch,
const QRectF &targetRect,
const QRectF &srcRect,
const QRect &clip,
T blender)
{
qreal sx = targetRect.width() / (qreal) srcRect.width();
qreal sy = targetRect.height() / (qreal) srcRect.height();
int ix = 0x00010000 / sx;
int iy = 0x00010000 / sy;
// qDebug() << "scale:" << endl
// << " - target" << targetRect << endl
// << " - source" << srcRect << endl
// << " - clip" << clip << endl
// << " - sx=" << sx << " sy=" << sy << " ix=" << ix << " iy=" << iy;
int cx1 = clip.x();
int cx2 = clip.x() + clip.width();
int cy1 = clip.top();
int cy2 = clip.y() + clip.height();
int tx1 = qRound(targetRect.left());
int tx2 = qRound(targetRect.right());
int ty1 = qRound(targetRect.top());
int ty2 = qRound(targetRect.bottom());
if (tx2 < tx1)
qSwap(tx2, tx1);
if (ty2 < ty1)
qSwap(ty2, ty1);
if (tx1 < cx1)
tx1 = cx1;
if (tx2 >= cx2)
tx2 = cx2;
if (tx1 >= tx2)
return;
if (ty1 < cy1)
ty1 = cy1;
if (ty2 >= cy2)
ty2 = cy2;
if (ty1 >= ty2)
return;
int h = ty2 - ty1;
int w = tx2 - tx1;
if (!w || !h)
return;
quint32 basex;
quint32 srcy;
if (sx < 0) {
int dstx = qFloor((tx1 + qreal(0.5) - targetRect.right()) * ix) + 1;
basex = quint32(srcRect.right() * 65536) + dstx;
} else {
int dstx = qCeil((tx1 + qreal(0.5) - targetRect.left()) * ix) - 1;
basex = quint32(srcRect.left() * 65536) + dstx;
}
if (sy < 0) {
int dsty = qFloor((ty1 + qreal(0.5) - targetRect.bottom()) * iy) + 1;
srcy = quint32(srcRect.bottom() * 65536) + dsty;
} else {
int dsty = qCeil((ty1 + qreal(0.5) - targetRect.top()) * iy) - 1;
srcy = quint32(srcRect.top() * 65536) + dsty;
}
quint32 *dst = ((quint32 *) (destPixels + ty1 * dbpl)) + tx1;
// this bounds check here is required as floating point rounding above might in some cases lead to
// w/h values that are one pixel too large, falling outside of the valid image area.
const int ystart = srcy >> 16;
if (ystart >= srch && iy < 0) {
srcy += iy;
--h;
}
const int xstart = basex >> 16;
if (xstart >= (int)(sbpl/sizeof(quint32)) && ix < 0) {
basex += ix;
--w;
}
int yend = (srcy + iy * (h - 1)) >> 16;
if (yend < 0 || yend >= srch)
--h;
int xend = (basex + ix * (w - 1)) >> 16;
if (xend < 0 || xend >= (int)(sbpl/sizeof(quint32)))
--w;
while (h--) {
const uint *src = (const quint32 *) (srcPixels + (srcy >> 16) * sbpl);
quint32 srcx = basex;
int x = 0;
for (; x<w; ++x) {
blender.write(&dst[x], src[srcx >> 16]);
srcx += ix;
}
blender.flush(&dst[x]);
dst = (quint32 *)(((uchar *) dst) + dbpl);
srcy += iy;
}
}
struct QTransformImageVertex
{
qreal x, y, u, v; // destination coordinates (x, y) and source coordinates (u, v)
};
template <class SrcT, class DestT, class Blender>
void qt_transform_image_rasterize(DestT *destPixels, int dbpl,
const SrcT *srcPixels, int sbpl,
const QTransformImageVertex &topLeft, const QTransformImageVertex &bottomLeft,
const QTransformImageVertex &topRight, const QTransformImageVertex &bottomRight,
const QRect &sourceRect,
const QRect &clip,
qreal topY, qreal bottomY,
int dudx, int dvdx, int dudy, int dvdy, int u0, int v0,
Blender blender)
{
int fromY = qMax(qRound(topY), clip.top());
int toY = qMin(qRound(bottomY), clip.top() + clip.height());
if (fromY >= toY)
return;
qreal leftSlope = (bottomLeft.x - topLeft.x) / (bottomLeft.y - topLeft.y);
qreal rightSlope = (bottomRight.x - topRight.x) / (bottomRight.y - topRight.y);
int dx_l = int(leftSlope * 0x10000);
int dx_r = int(rightSlope * 0x10000);
int x_l = int((topLeft.x + (qreal(0.5) + fromY - topLeft.y) * leftSlope + qreal(0.5)) * 0x10000);
int x_r = int((topRight.x + (qreal(0.5) + fromY - topRight.y) * rightSlope + qreal(0.5)) * 0x10000);
int fromX, toX, x1, x2, u, v, i, ii;
DestT *line;
for (int y = fromY; y < toY; ++y) {
line = reinterpret_cast<DestT *>(reinterpret_cast<uchar *>(destPixels) + y * dbpl);
fromX = qMax(x_l >> 16, clip.left());
toX = qMin(x_r >> 16, clip.left() + clip.width());
if (fromX < toX) {
// Because of rounding, we can get source coordinates outside the source image.
// Clamp these coordinates to the source rect to avoid segmentation fault and
// garbage on the screen.
// Find the first pixel on the current scan line where the source coordinates are within the source rect.
x1 = fromX;
u = x1 * dudx + y * dudy + u0;
v = x1 * dvdx + y * dvdy + v0;
for (; x1 < toX; ++x1) {
int uu = u >> 16;
int vv = v >> 16;
if (uu >= sourceRect.left() && uu < sourceRect.left() + sourceRect.width()
&& vv >= sourceRect.top() && vv < sourceRect.top() + sourceRect.height()) {
break;
}
u += dudx;
v += dvdx;
}
// Find the last pixel on the current scan line where the source coordinates are within the source rect.
x2 = toX;
u = (x2 - 1) * dudx + y * dudy + u0;
v = (x2 - 1) * dvdx + y * dvdy + v0;
for (; x2 > x1; --x2) {
int uu = u >> 16;
int vv = v >> 16;
if (uu >= sourceRect.left() && uu < sourceRect.left() + sourceRect.width()
&& vv >= sourceRect.top() && vv < sourceRect.top() + sourceRect.height()) {
break;
}
u -= dudx;
v -= dvdx;
}
// Set up values at the beginning of the scan line.
u = fromX * dudx + y * dudy + u0;
v = fromX * dvdx + y * dvdy + v0;
line += fromX;
// Beginning of the scan line, with per-pixel checks.
i = x1 - fromX;
while (i) {
int uu = qBound(sourceRect.left(), u >> 16, sourceRect.left() + sourceRect.width() - 1);
int vv = qBound(sourceRect.top(), v >> 16, sourceRect.top() + sourceRect.height() - 1);
blender.write(line, reinterpret_cast<const SrcT *>(reinterpret_cast<const uchar *>(srcPixels) + vv * sbpl)[uu]);
u += dudx;
v += dvdx;
++line;
--i;
}
// Middle of the scan line, without checks.
// Manual loop unrolling.
i = x2 - x1;
ii = i >> 3;
while (ii) {
blender.write(&line[0], reinterpret_cast<const SrcT *>(reinterpret_cast<const uchar *>(srcPixels) + (v >> 16) * sbpl)[u >> 16]); u += dudx; v += dvdx;
blender.write(&line[1], reinterpret_cast<const SrcT *>(reinterpret_cast<const uchar *>(srcPixels) + (v >> 16) * sbpl)[u >> 16]); u += dudx; v += dvdx;
blender.write(&line[2], reinterpret_cast<const SrcT *>(reinterpret_cast<const uchar *>(srcPixels) + (v >> 16) * sbpl)[u >> 16]); u += dudx; v += dvdx;
blender.write(&line[3], reinterpret_cast<const SrcT *>(reinterpret_cast<const uchar *>(srcPixels) + (v >> 16) * sbpl)[u >> 16]); u += dudx; v += dvdx;
blender.write(&line[4], reinterpret_cast<const SrcT *>(reinterpret_cast<const uchar *>(srcPixels) + (v >> 16) * sbpl)[u >> 16]); u += dudx; v += dvdx;
blender.write(&line[5], reinterpret_cast<const SrcT *>(reinterpret_cast<const uchar *>(srcPixels) + (v >> 16) * sbpl)[u >> 16]); u += dudx; v += dvdx;
blender.write(&line[6], reinterpret_cast<const SrcT *>(reinterpret_cast<const uchar *>(srcPixels) + (v >> 16) * sbpl)[u >> 16]); u += dudx; v += dvdx;
blender.write(&line[7], reinterpret_cast<const SrcT *>(reinterpret_cast<const uchar *>(srcPixels) + (v >> 16) * sbpl)[u >> 16]); u += dudx; v += dvdx;
line += 8;
--ii;
}
switch (i & 7) {
case 7: blender.write(line, reinterpret_cast<const SrcT *>(reinterpret_cast<const uchar *>(srcPixels) + (v >> 16) * sbpl)[u >> 16]); u += dudx; v += dvdx; ++line; Q_FALLTHROUGH();
case 6: blender.write(line, reinterpret_cast<const SrcT *>(reinterpret_cast<const uchar *>(srcPixels) + (v >> 16) * sbpl)[u >> 16]); u += dudx; v += dvdx; ++line; Q_FALLTHROUGH();
case 5: blender.write(line, reinterpret_cast<const SrcT *>(reinterpret_cast<const uchar *>(srcPixels) + (v >> 16) * sbpl)[u >> 16]); u += dudx; v += dvdx; ++line; Q_FALLTHROUGH();
case 4: blender.write(line, reinterpret_cast<const SrcT *>(reinterpret_cast<const uchar *>(srcPixels) + (v >> 16) * sbpl)[u >> 16]); u += dudx; v += dvdx; ++line; Q_FALLTHROUGH();
case 3: blender.write(line, reinterpret_cast<const SrcT *>(reinterpret_cast<const uchar *>(srcPixels) + (v >> 16) * sbpl)[u >> 16]); u += dudx; v += dvdx; ++line; Q_FALLTHROUGH();
case 2: blender.write(line, reinterpret_cast<const SrcT *>(reinterpret_cast<const uchar *>(srcPixels) + (v >> 16) * sbpl)[u >> 16]); u += dudx; v += dvdx; ++line; Q_FALLTHROUGH();
case 1: blender.write(line, reinterpret_cast<const SrcT *>(reinterpret_cast<const uchar *>(srcPixels) + (v >> 16) * sbpl)[u >> 16]); u += dudx; v += dvdx; ++line;
}
// End of the scan line, with per-pixel checks.
i = toX - x2;
while (i) {
int uu = qBound(sourceRect.left(), u >> 16, sourceRect.left() + sourceRect.width() - 1);
int vv = qBound(sourceRect.top(), v >> 16, sourceRect.top() + sourceRect.height() - 1);
blender.write(line, reinterpret_cast<const SrcT *>(reinterpret_cast<const uchar *>(srcPixels) + vv * sbpl)[uu]);
u += dudx;
v += dvdx;
++line;
--i;
}
blender.flush(line);
}
x_l += dx_l;
x_r += dx_r;
}
}
template <class SrcT, class DestT, class Blender>
void qt_transform_image(DestT *destPixels, int dbpl,
const SrcT *srcPixels, int sbpl,
const QRectF &targetRect,
const QRectF &sourceRect,
const QRect &clip,
const QTransform &targetRectTransform,
Blender blender)
{
enum Corner
{
TopLeft,
TopRight,
BottomRight,
BottomLeft
};
// map source rectangle to destination.
QTransformImageVertex v[4];
v[TopLeft].u = v[BottomLeft].u = sourceRect.left();
v[TopLeft].v = v[TopRight].v = sourceRect.top();
v[TopRight].u = v[BottomRight].u = sourceRect.right();
v[BottomLeft].v = v[BottomRight].v = sourceRect.bottom();
targetRectTransform.map(targetRect.left(), targetRect.top(), &v[TopLeft].x, &v[TopLeft].y);
targetRectTransform.map(targetRect.right(), targetRect.top(), &v[TopRight].x, &v[TopRight].y);
targetRectTransform.map(targetRect.left(), targetRect.bottom(), &v[BottomLeft].x, &v[BottomLeft].y);
targetRectTransform.map(targetRect.right(), targetRect.bottom(), &v[BottomRight].x, &v[BottomRight].y);
// find topmost vertex.
int topmost = 0;
for (int i = 1; i < 4; ++i) {
if (v[i].y < v[topmost].y)
topmost = i;
}
// rearrange array such that topmost vertex is at index 0.
switch (topmost) {
case 1:
{
QTransformImageVertex t = v[0];
for (int i = 0; i < 3; ++i)
v[i] = v[i+1];
v[3] = t;
}
break;
case 2:
qSwap(v[0], v[2]);
qSwap(v[1], v[3]);
break;
case 3:
{
QTransformImageVertex t = v[3];
for (int i = 3; i > 0; --i)
v[i] = v[i-1];
v[0] = t;
}
break;
}
// if necessary, swap vertex 1 and 3 such that 1 is to the left of 3.
qreal dx1 = v[1].x - v[0].x;
qreal dy1 = v[1].y - v[0].y;
qreal dx2 = v[3].x - v[0].x;
qreal dy2 = v[3].y - v[0].y;
if (dx1 * dy2 - dx2 * dy1 > 0)
qSwap(v[1], v[3]);
QTransformImageVertex u = {v[1].x - v[0].x, v[1].y - v[0].y, v[1].u - v[0].u, v[1].v - v[0].v};
QTransformImageVertex w = {v[2].x - v[0].x, v[2].y - v[0].y, v[2].u - v[0].u, v[2].v - v[0].v};
qreal det = u.x * w.y - u.y * w.x;
if (det == 0)
return;
qreal invDet = 1.0 / det;
qreal m11, m12, m21, m22, mdx, mdy;
m11 = (u.u * w.y - u.y * w.u) * invDet;
m12 = (u.x * w.u - u.u * w.x) * invDet;
m21 = (u.v * w.y - u.y * w.v) * invDet;
m22 = (u.x * w.v - u.v * w.x) * invDet;
mdx = v[0].u - m11 * v[0].x - m12 * v[0].y;
mdy = v[0].v - m21 * v[0].x - m22 * v[0].y;
int dudx = int(m11 * 0x10000);
int dvdx = int(m21 * 0x10000);
int dudy = int(m12 * 0x10000);
int dvdy = int(m22 * 0x10000);
int u0 = qCeil((qreal(0.5) * m11 + qreal(0.5) * m12 + mdx) * 0x10000) - 1;
int v0 = qCeil((qreal(0.5) * m21 + qreal(0.5) * m22 + mdy) * 0x10000) - 1;
int x1 = qFloor(sourceRect.left());
int y1 = qFloor(sourceRect.top());
int x2 = qCeil(sourceRect.right());
int y2 = qCeil(sourceRect.bottom());
QRect sourceRectI(x1, y1, x2 - x1, y2 - y1);
// rasterize trapezoids.
if (v[1].y < v[3].y) {
qt_transform_image_rasterize(destPixels, dbpl, srcPixels, sbpl, v[0], v[1], v[0], v[3], sourceRectI, clip, v[0].y, v[1].y, dudx, dvdx, dudy, dvdy, u0, v0, blender);
qt_transform_image_rasterize(destPixels, dbpl, srcPixels, sbpl, v[1], v[2], v[0], v[3], sourceRectI, clip, v[1].y, v[3].y, dudx, dvdx, dudy, dvdy, u0, v0, blender);
qt_transform_image_rasterize(destPixels, dbpl, srcPixels, sbpl, v[1], v[2], v[3], v[2], sourceRectI, clip, v[3].y, v[2].y, dudx, dvdx, dudy, dvdy, u0, v0, blender);
} else {
qt_transform_image_rasterize(destPixels, dbpl, srcPixels, sbpl, v[0], v[1], v[0], v[3], sourceRectI, clip, v[0].y, v[3].y, dudx, dvdx, dudy, dvdy, u0, v0, blender);
qt_transform_image_rasterize(destPixels, dbpl, srcPixels, sbpl, v[0], v[1], v[3], v[2], sourceRectI, clip, v[3].y, v[1].y, dudx, dvdx, dudy, dvdy, u0, v0, blender);
qt_transform_image_rasterize(destPixels, dbpl, srcPixels, sbpl, v[1], v[2], v[3], v[2], sourceRectI, clip, v[1].y, v[2].y, dudx, dvdx, dudy, dvdy, u0, v0, blender);
}
}
QT_END_NAMESPACE
#endif // QBLENDFUNCTIONS_P_H