mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
synced 2024-09-13 09:24:08 -07:00
112 lines
3.2 KiB
C++
112 lines
3.2 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
|
|
* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
#include "gfxPath.h"
|
|
#include "gfxPoint.h"
|
|
|
|
#include "cairo.h"
|
|
|
|
gfxPath::gfxPath(cairo_path_t* aPath) : mPath(aPath)
|
|
{
|
|
}
|
|
|
|
gfxPath::~gfxPath()
|
|
{
|
|
cairo_path_destroy(mPath);
|
|
}
|
|
|
|
gfxFlattenedPath::gfxFlattenedPath(cairo_path_t* aPath) : gfxPath(aPath)
|
|
{
|
|
}
|
|
|
|
gfxFlattenedPath::~gfxFlattenedPath()
|
|
{
|
|
}
|
|
|
|
static gfxFloat
|
|
CalcSubLengthAndAdvance(cairo_path_data_t *aData,
|
|
gfxPoint &aPathStart, gfxPoint &aCurrent)
|
|
{
|
|
float sublength = 0;
|
|
|
|
switch (aData->header.type) {
|
|
case CAIRO_PATH_MOVE_TO:
|
|
{
|
|
aCurrent = aPathStart = gfxPoint(aData[1].point.x,
|
|
aData[1].point.y);
|
|
break;
|
|
}
|
|
case CAIRO_PATH_LINE_TO:
|
|
{
|
|
gfxPoint diff =
|
|
gfxPoint(aData[1].point.x, aData[1].point.y) - aCurrent;
|
|
sublength = sqrt(diff.x * diff.x + diff.y * diff.y);
|
|
aCurrent = gfxPoint(aData[1].point.x, aData[1].point.y);
|
|
break;
|
|
}
|
|
case CAIRO_PATH_CURVE_TO:
|
|
/* should never happen with a flattened path */
|
|
NS_WARNING("curve_to in flattened path");
|
|
break;
|
|
case CAIRO_PATH_CLOSE_PATH:
|
|
{
|
|
gfxPoint diff = aPathStart - aCurrent;
|
|
sublength = sqrt(diff.x * diff.x + diff.y * diff.y);
|
|
aCurrent = aPathStart;
|
|
break;
|
|
}
|
|
}
|
|
return sublength;
|
|
}
|
|
|
|
gfxFloat
|
|
gfxFlattenedPath::GetLength()
|
|
{
|
|
gfxPoint start(0, 0); // start of current subpath
|
|
gfxPoint current(0, 0); // current point
|
|
gfxFloat length = 0; // current summed length
|
|
|
|
for (PRInt32 i = 0;
|
|
i < mPath->num_data;
|
|
i += mPath->data[i].header.length) {
|
|
length += CalcSubLengthAndAdvance(&mPath->data[i], start, current);
|
|
}
|
|
return length;
|
|
}
|
|
|
|
gfxPoint
|
|
gfxFlattenedPath::FindPoint(gfxPoint aOffset, gfxFloat *aAngle)
|
|
{
|
|
gfxPoint start(0, 0); // start of current subpath
|
|
gfxPoint current(0, 0); // current point
|
|
gfxFloat length = 0; // current summed length
|
|
|
|
for (PRInt32 i = 0;
|
|
i < mPath->num_data;
|
|
i += mPath->data[i].header.length) {
|
|
gfxPoint prev = current;
|
|
|
|
gfxFloat sublength = CalcSubLengthAndAdvance(&mPath->data[i],
|
|
start, current);
|
|
|
|
gfxPoint diff = current - prev;
|
|
if (aAngle)
|
|
*aAngle = atan2(diff.y, diff.x);
|
|
|
|
if (sublength != 0 && length + sublength >= aOffset.x) {
|
|
gfxFloat ratio = (aOffset.x - length) / sublength;
|
|
gfxFloat normalization =
|
|
1.0 / sqrt(diff.x * diff.x + diff.y * diff.y);
|
|
|
|
return prev * (1.0f - ratio) + current * ratio +
|
|
gfxPoint(-diff.y, diff.x) * aOffset.y * normalization;
|
|
}
|
|
length += sublength;
|
|
}
|
|
|
|
// requested offset is past the end of the path - return last point
|
|
return current;
|
|
}
|