AuroraMiddleware/skia2
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Update SkMatrix_Reference.bmh to reflect mapPointsWithStride removal

Browse Source 
Change-Id: I6a932e011a0d2bb0ddad120b824499d6624418c8
Reviewed-on: https://skia-review.googlesource.com/91443
Reviewed-by: Cary Clark <caryclark@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
This commit is contained in:
Brian Salomon 2018-01-05 13:12:14 -05:00
parent 5ef4ebf3c4
commit 262cd40966
1 changed files with 0 additions and 53 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

53
docs/SkMatrix_Reference.bmh
View File

@ -3312,59 +3312,6 @@ Matrix * pt = |D E F| |y| = |Ax+By+C Dx+Ey+F Gx+Hy+I| = ------- , -------
# ------------------------------------------------------------------------------
#Method void mapPointsWithStride(SkPoint dst[], const SkPoint src[], size_t stride, int count) const
Maps src Point array of length count to dst Point array, skipping stride bytes
to advance from one Point to the next.
Points are mapped by multiplying each Point by Matrix. Given:
#Code
#Literal
| A B C | | x |
Matrix = | D E F |, src = | y |
| G H I | | 1 |
##
each resulting dst Point is computed as:
#Code
#Literal
|A B C| |x| Ax+By+C Dx+Ey+F
Matrix * pt = |D E F| |y| = |Ax+By+C Dx+Ey+F Gx+Hy+I| = ------- , -------
|G H I| |1| Gx+Hy+I Gx+Hy+I
##
#Param dst storage for mapped Points ##
#Param src Points to transform ##
#Param stride size of record starting with Point, in bytes ##
#Param count number of Points to transform ##
#Example
struct PointZ {
SkPoint fPt;
const SkPoint fStationary;
};
const PointZ src[] = {{{40, 70}, {40, 70}}, {{180, 70}, {180, 70}}, {{180, 220}, {180, 220}},
{{40, 220}, {40, 220}}};
PointZ dst[] = {{{0, 0}, {60, 80}}, {{0, 0}, {150, 40}}, {{0, 0}, {100, 240}},
{{0, 0}, {10, 250}}};
constexpr int count = SK_ARRAY_COUNT(src);
SkPaint paint;
paint.setARGB(77, 23, 99, 154);
for (int i = 0; i < 5; ++i) {
SkMatrix matrix;
matrix.setRotate(10 * i, 128, 128);
matrix.mapPointsWithStride(&dst[0].fPt, &src[0].fPt, sizeof(PointZ), count);
canvas->drawPoints(SkCanvas::kPolygon_PointMode, count * 2, &dst[0].fPt, paint);
}
##
#SeeAlso mapPoints mapXY mapHomogeneousPoints mapVectors
##
# ------------------------------------------------------------------------------
#Method void mapHomogeneousPoints(SkPoint3 dst[], const SkPoint3 src[], int count) const
Maps src Point3 array of length count to dst Point3 array, which must of length count or