GpStatus WINGDIPAPI GdipTransformPath(GpPath *path, GpMatrix *matrix)
{
if(!path)
return InvalidParameter;
if(path->pathdata.Count == 0)
return Ok;
return GdipTransformMatrixPoints(matrix, path->pathdata.Points,
path->pathdata.Count);
}
/* Transforms GpRegion elements with given matrix */
static GpStatus transform_region_element(region_element* element, GpMatrix *matrix)
{
GpStatus stat;
switch(element->type)
{
case RegionDataEmptyRect:
case RegionDataInfiniteRect:
return Ok;
case RegionDataRect:
{
/* We can't transform a rectangle, so convert it to a path. */
GpRegion *new_region;
GpPath *path;
stat = GdipCreatePath(FillModeAlternate, &path);
if (stat == Ok)
{
stat = GdipAddPathRectangle(path,
element->elementdata.rect.X, element->elementdata.rect.Y,
element->elementdata.rect.Width, element->elementdata.rect.Height);
if (stat == Ok)
stat = GdipCreateRegionPath(path, &new_region);
GdipDeletePath(path);
}
if (stat == Ok)
{
/* Steal the element from the created region. */
memcpy(element, &new_region->node, sizeof(region_element));
heap_free(new_region);
}
else
return stat;
}
/* Fall-through to do the actual conversion. */
case RegionDataPath:
if (!element->elementdata.path->pathdata.Count)
return Ok;
stat = GdipTransformMatrixPoints(matrix,
element->elementdata.path->pathdata.Points,
element->elementdata.path->pathdata.Count);
return stat;
default:
stat = transform_region_element(element->elementdata.combine.left, matrix);
if (stat == Ok)
stat = transform_region_element(element->elementdata.combine.right, matrix);
return stat;
}
}
/* Windows expands the bounding box to the maximum possible bounding box
* for a given pen. For example, if a line join can extend past the point
* it's joining by x units, the bounding box is extended by x units in every
* direction (even though this is too conservative for most cases). */
GpStatus WINGDIPAPI GdipGetPathWorldBounds(GpPath* path, GpRectF* bounds,
GDIPCONST GpMatrix *matrix, GDIPCONST GpPen *pen)
{
GpPointF * points, temp_pts[4];
INT count, i;
REAL path_width = 1.0, width, height, temp, low_x, low_y, high_x, high_y;
/* Matrix and pen can be null. */
if(!path || !bounds)
return InvalidParameter;
/* If path is empty just return. */
count = path->pathdata.Count;
if(count == 0){
bounds->X = bounds->Y = bounds->Width = bounds->Height = 0.0;
return Ok;
}
points = path->pathdata.Points;
low_x = high_x = points[0].X;
low_y = high_y = points[0].Y;
for(i = 1; i < count; i++){
low_x = min(low_x, points[i].X);
low_y = min(low_y, points[i].Y);
high_x = max(high_x, points[i].X);
high_y = max(high_y, points[i].Y);
}
width = high_x - low_x;
height = high_y - low_y;
/* This looks unusual but it's the only way I can imitate windows. */
if(matrix){
temp_pts[0].X = low_x;
temp_pts[0].Y = low_y;
temp_pts[1].X = low_x;
temp_pts[1].Y = high_y;
temp_pts[2].X = high_x;
temp_pts[2].Y = high_y;
temp_pts[3].X = high_x;
temp_pts[3].Y = low_y;
GdipTransformMatrixPoints((GpMatrix*)matrix, temp_pts, 4);
low_x = temp_pts[0].X;
low_y = temp_pts[0].Y;
for(i = 1; i < 4; i++){
low_x = min(low_x, temp_pts[i].X);
low_y = min(low_y, temp_pts[i].Y);
}
temp = width;
width = height * fabs(matrix->matrix[2]) + width * fabs(matrix->matrix[0]);
height = height * fabs(matrix->matrix[3]) + temp * fabs(matrix->matrix[1]);
}
if(pen){
path_width = pen->width / 2.0;
if(count > 2)
path_width = max(path_width, pen->width * pen->miterlimit / 2.0);
/* FIXME: this should probably also check for the startcap */
if(pen->endcap & LineCapNoAnchor)
path_width = max(path_width, pen->width * 2.2);
low_x -= path_width;
low_y -= path_width;
width += 2.0 * path_width;
height += 2.0 * path_width;
}
bounds->X = low_x;
bounds->Y = low_y;
bounds->Width = width;
bounds->Height = height;
return Ok;
}
