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sw_engine: revise stroke scaling logic.

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previous fast track logic is useless,
it actually doesn't helpful for performance, just increase the code complexity.

Change-Id: Ib6ad204edfb241d74c41413dfec7ab42fb02af81
This commit is contained in:
Hermet Park 2020-07-24 11:03:20 +09:00
parent f1aab52958
commit 5fdc1f7fc8
2 changed files with 7 additions and 24 deletions
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4
src/lib/sw_engine/tvgSwCommon.h
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@ -153,13 +153,11 @@ struct SwStroke
SwStrokeBorder borders[2]; SwStrokeBorder borders[2];
float sx; float sx, sy;
float sy;
bool firstPt; bool firstPt;
bool openSubPath; bool openSubPath;
bool handleWideStrokes; bool handleWideStrokes;
bool postScale;
}; };
struct SwDashStroke struct SwDashStroke

27
src/lib/sw_engine/tvgSwStroke.cpp
View file

@ -36,10 +36,8 @@ static inline SwFixed SIDE_TO_ROTATE(const int32_t s)
static inline void SCALE(SwStroke& stroke, SwPoint& pt) static inline void SCALE(SwStroke& stroke, SwPoint& pt)
{ {
if (stroke.postScale) { pt.x *= stroke.sx;
pt.x = pt.x * stroke.sx; pt.y *= stroke.sy;
pt.y = pt.y * stroke.sy;
}
} }
@ -548,7 +546,6 @@ static void _cubicTo(SwStroke& stroke, const SwPoint& ctrl1, const SwPoint& ctrl
SwPoint delta = {alen, 0}; SwPoint delta = {alen, 0};
mathRotate(delta, beta); mathRotate(delta, beta);
SCALE(stroke, delta);
delta += _start; delta += _start;
//circumnavigate the negative sector backwards //circumnavigate the negative sector backwards
@ -848,26 +845,14 @@ void strokeReset(SwStroke& stroke, const Shape* sdata, const Matrix* transform)
{ {
assert(sdata); assert(sdata);
auto scale = 1.0f;
if (transform) { if (transform) {
//Fast Track: if x/y scale factor is identical, we can scale width size simply. stroke.sx = sqrt(pow(transform->e11, 2) + pow(transform->e21, 2));
auto sx = sqrt(pow(transform->e11, 2) + pow(transform->e21, 2)); stroke.sy = sqrt(pow(transform->e12, 2) + pow(transform->e22, 2));
auto sy = sqrt(pow(transform->e12, 2) + pow(transform->e22, 2));
if (fabsf(sx - sy) < FLT_EPSILON) {
scale = sx;
stroke.postScale = false;
//Try scaling stroke with normal approach.
} else { } else {
stroke.postScale = true; stroke.sx = stroke.sy = 1.0f;
stroke.sx = sx;
stroke.sy = sy;
}
} else {
stroke.postScale = false;
} }
stroke.width = TO_SWCOORD(sdata->strokeWidth() * 0.5 * scale); stroke.width = TO_SWCOORD(sdata->strokeWidth() * 0.5);
stroke.cap = sdata->strokeCap(); stroke.cap = sdata->strokeCap();
//Save line join: it can be temporarily changed when stroking curves... //Save line join: it can be temporarily changed when stroking curves...