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//========================================================================
//
// SplashClip.cc
//
//========================================================================
//========================================================================
//
// Modified under the Poppler project - http://poppler.freedesktop.org
//
// All changes made under the Poppler project to this file are licensed
// under GPL version 2 or later
//
// Copyright (C) 2010, 2021 Albert Astals Cid <aacid@kde.org>
// Copyright (C) 2013, 2021 Thomas Freitag <Thomas.Freitag@alfa.de>
// Copyright (C) 2019 Stefan BrĂ¼ns <stefan.bruens@rwth-aachen.de>
//
// To see a description of the changes please see the Changelog file that
// came with your tarball or type make ChangeLog if you are building from git
//
//========================================================================
#include <config.h>
#include <cstdlib>
#include <cstring>
#include "goo/gmem.h"
#include "SplashErrorCodes.h"
#include "SplashMath.h"
#include "SplashPath.h"
#include "SplashXPath.h"
#include "SplashXPathScanner.h"
#include "SplashBitmap.h"
#include "SplashClip.h"
//------------------------------------------------------------------------
// SplashClip.flags
//------------------------------------------------------------------------
#define splashClipEO 0x01 // use even-odd rule
//------------------------------------------------------------------------
// SplashClip
//------------------------------------------------------------------------
SplashClip::SplashClip(SplashCoord x0, SplashCoord y0, SplashCoord x1, SplashCoord y1, bool antialiasA)
{
antialias = antialiasA;
if (x0 < x1) {
xMin = x0;
xMax = x1;
} else {
xMin = x1;
xMax = x0;
}
if (y0 < y1) {
yMin = y0;
yMax = y1;
} else {
yMin = y1;
yMax = y0;
}
xMinI = splashFloor(xMin);
yMinI = splashFloor(yMin);
xMaxI = splashCeil(xMax) - 1;
yMaxI = splashCeil(yMax) - 1;
flags = nullptr;
length = size = 0;
}
SplashClip::SplashClip(const SplashClip *clip)
{
int i;
antialias = clip->antialias;
xMin = clip->xMin;
yMin = clip->yMin;
xMax = clip->xMax;
yMax = clip->yMax;
xMinI = clip->xMinI;
yMinI = clip->yMinI;
xMaxI = clip->xMaxI;
yMaxI = clip->yMaxI;
length = clip->length;
size = clip->size;
flags = (unsigned char *)gmallocn(size, sizeof(unsigned char));
scanners = clip->scanners;
for (i = 0; i < length; ++i) {
flags[i] = clip->flags[i];
}
}
SplashClip::~SplashClip()
{
gfree(flags);
}
void SplashClip::grow(int nPaths)
{
if (length + nPaths > size) {
if (size == 0) {
size = 32;
}
while (size < length + nPaths) {
size *= 2;
}
flags = (unsigned char *)greallocn(flags, size, sizeof(unsigned char));
}
}
void SplashClip::resetToRect(SplashCoord x0, SplashCoord y0, SplashCoord x1, SplashCoord y1)
{
gfree(flags);
flags = nullptr;
scanners = {};
length = size = 0;
if (x0 < x1) {
xMin = x0;
xMax = x1;
} else {
xMin = x1;
xMax = x0;
}
if (y0 < y1) {
yMin = y0;
yMax = y1;
} else {
yMin = y1;
yMax = y0;
}
xMinI = splashFloor(xMin);
yMinI = splashFloor(yMin);
xMaxI = splashCeil(xMax) - 1;
yMaxI = splashCeil(yMax) - 1;
}
SplashError SplashClip::clipToRect(SplashCoord x0, SplashCoord y0, SplashCoord x1, SplashCoord y1)
{
if (x0 < x1) {
if (x0 > xMin) {
xMin = x0;
xMinI = splashFloor(xMin);
}
if (x1 < xMax) {
xMax = x1;
xMaxI = splashCeil(xMax) - 1;
}
} else {
if (x1 > xMin) {
xMin = x1;
xMinI = splashFloor(xMin);
}
if (x0 < xMax) {
xMax = x0;
xMaxI = splashCeil(xMax) - 1;
}
}
if (y0 < y1) {
if (y0 > yMin) {
yMin = y0;
yMinI = splashFloor(yMin);
}
if (y1 < yMax) {
yMax = y1;
yMaxI = splashCeil(yMax) - 1;
}
} else {
if (y1 > yMin) {
yMin = y1;
yMinI = splashFloor(yMin);
}
if (y0 < yMax) {
yMax = y0;
yMaxI = splashCeil(yMax) - 1;
}
}
return splashOk;
}
SplashError SplashClip::clipToPath(SplashPath *path, SplashCoord *matrix, SplashCoord flatness, bool eo)
{
int yMinAA, yMaxAA;
SplashXPath xPath(path, matrix, flatness, true);
// check for an empty path
if (xPath.length == 0) {
xMax = xMin - 1;
yMax = yMin - 1;
xMaxI = splashCeil(xMax) - 1;
yMaxI = splashCeil(yMax) - 1;
// check for a rectangle
} else if (xPath.length == 4
&& ((xPath.segs[0].x0 == xPath.segs[0].x1 && xPath.segs[0].x0 == xPath.segs[1].x0 && xPath.segs[0].x0 == xPath.segs[3].x1 && xPath.segs[2].x0 == xPath.segs[2].x1 && xPath.segs[2].x0 == xPath.segs[1].x1
&& xPath.segs[2].x0 == xPath.segs[3].x0 && xPath.segs[1].y0 == xPath.segs[1].y1 && xPath.segs[1].y0 == xPath.segs[0].y1 && xPath.segs[1].y0 == xPath.segs[2].y0 && xPath.segs[3].y0 == xPath.segs[3].y1
&& xPath.segs[3].y0 == xPath.segs[0].y0 && xPath.segs[3].y0 == xPath.segs[2].y1)
|| (xPath.segs[0].y0 == xPath.segs[0].y1 && xPath.segs[0].y0 == xPath.segs[1].y0 && xPath.segs[0].y0 == xPath.segs[3].y1 && xPath.segs[2].y0 == xPath.segs[2].y1 && xPath.segs[2].y0 == xPath.segs[1].y1
&& xPath.segs[2].y0 == xPath.segs[3].y0 && xPath.segs[1].x0 == xPath.segs[1].x1 && xPath.segs[1].x0 == xPath.segs[0].x1 && xPath.segs[1].x0 == xPath.segs[2].x0 && xPath.segs[3].x0 == xPath.segs[3].x1
&& xPath.segs[3].x0 == xPath.segs[0].x0 && xPath.segs[3].x0 == xPath.segs[2].x1))) {
clipToRect(xPath.segs[0].x0, xPath.segs[0].y0, xPath.segs[2].x0, xPath.segs[2].y0);
} else {
grow(1);
if (antialias) {
xPath.aaScale();
}
xPath.sort();
flags[length] = eo ? splashClipEO : 0;
if (antialias) {
yMinAA = yMinI * splashAASize;
yMaxAA = (yMaxI + 1) * splashAASize - 1;
} else {
yMinAA = yMinI;
yMaxAA = yMaxI;
}
scanners.emplace_back(std::make_shared<SplashXPathScanner>(xPath, eo, yMinAA, yMaxAA));
++length;
}
return splashOk;
}
SplashClipResult SplashClip::testRect(int rectXMin, int rectYMin, int rectXMax, int rectYMax)
{
// This tests the rectangle:
// x = [rectXMin, rectXMax + 1) (note: rect coords are ints)
// y = [rectYMin, rectYMax + 1)
// against the clipping region:
// x = [xMin, xMax) (note: clipping coords are fp)
// y = [yMin, yMax)
if ((SplashCoord)(rectXMax + 1) <= xMin || (SplashCoord)rectXMin >= xMax || (SplashCoord)(rectYMax + 1) <= yMin || (SplashCoord)rectYMin >= yMax) {
return splashClipAllOutside;
}
if ((SplashCoord)rectXMin >= xMin && (SplashCoord)(rectXMax + 1) <= xMax && (SplashCoord)rectYMin >= yMin && (SplashCoord)(rectYMax + 1) <= yMax && length == 0) {
return splashClipAllInside;
}
return splashClipPartial;
}
SplashClipResult SplashClip::testSpan(int spanXMin, int spanXMax, int spanY)
{
int i;
// This tests the rectangle:
// x = [spanXMin, spanXMax + 1) (note: span coords are ints)
// y = [spanY, spanY + 1)
// against the clipping region:
// x = [xMin, xMax) (note: clipping coords are fp)
// y = [yMin, yMax)
if ((SplashCoord)(spanXMax + 1) <= xMin || (SplashCoord)spanXMin >= xMax || (SplashCoord)(spanY + 1) <= yMin || (SplashCoord)spanY >= yMax) {
return splashClipAllOutside;
}
if (!((SplashCoord)spanXMin >= xMin && (SplashCoord)(spanXMax + 1) <= xMax && (SplashCoord)spanY >= yMin && (SplashCoord)(spanY + 1) <= yMax)) {
return splashClipPartial;
}
if (antialias) {
for (i = 0; i < length; ++i) {
if (!scanners[i]->testSpan(spanXMin * splashAASize, spanXMax * splashAASize + (splashAASize - 1), spanY * splashAASize)) {
return splashClipPartial;
}
}
} else {
for (i = 0; i < length; ++i) {
if (!scanners[i]->testSpan(spanXMin, spanXMax, spanY)) {
return splashClipPartial;
}
}
}
return splashClipAllInside;
}
void SplashClip::clipAALine(SplashBitmap *aaBuf, int *x0, int *x1, int y, bool adjustVertLine)
{
int xx0, xx1, xx, yy, i;
SplashColorPtr p;
// zero out pixels with x < xMin
xx0 = *x0 * splashAASize;
xx1 = splashFloor(xMin * splashAASize);
if (xx1 > aaBuf->getWidth()) {
xx1 = aaBuf->getWidth();
}
if (xx0 < xx1) {
xx0 &= ~7;
for (yy = 0; yy < splashAASize; ++yy) {
p = aaBuf->getDataPtr() + yy * aaBuf->getRowSize() + (xx0 >> 3);
for (xx = xx0; xx + 7 < xx1; xx += 8) {
*p++ = 0;
}
if (xx < xx1 && !adjustVertLine) {
*p &= 0xff >> (xx1 & 7);
}
}
*x0 = splashFloor(xMin);
}
// zero out pixels with x > xMax
xx0 = splashFloor(xMax * splashAASize) + 1;
if (xx0 < 0) {
xx0 = 0;
}
xx1 = (*x1 + 1) * splashAASize;
if (xx0 < xx1 && !adjustVertLine) {
for (yy = 0; yy < splashAASize; ++yy) {
p = aaBuf->getDataPtr() + yy * aaBuf->getRowSize() + (xx0 >> 3);
xx = xx0;
if (xx & 7) {
*p &= 0xff00 >> (xx & 7);
xx = (xx & ~7) + 8;
++p;
}
for (; xx < xx1; xx += 8) {
*p++ = 0;
}
}
*x1 = splashFloor(xMax);
}
// check the paths
for (i = 0; i < length; ++i) {
scanners[i]->clipAALine(aaBuf, x0, x1, y);
}
if (*x0 > *x1) {
*x0 = *x1;
}
if (*x0 < 0) {
*x0 = 0;
}
if ((*x0 >> 1) >= aaBuf->getRowSize()) {
xx0 = *x0;
*x0 = (aaBuf->getRowSize() - 1) << 1;
if (xx0 & 1) {
*x0 = *x0 + 1;
}
}
if (*x1 < *x0) {
*x1 = *x0;
}
if ((*x1 >> 1) >= aaBuf->getRowSize()) {
xx0 = *x1;
*x1 = (aaBuf->getRowSize() - 1) << 1;
if (xx0 & 1) {
*x1 = *x1 + 1;
}
}
}
bool SplashClip::testClipPaths(int x, int y)
{
if (antialias) {
x *= splashAASize;
y *= splashAASize;
}
for (int i = 0; i < length; ++i) {
if (!scanners[i]->test(x, y)) {
return false;
}
}
return true;
}