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-rw-r--r--core/fxcrt/fx_coordinates.cpp29
-rw-r--r--core/fxcrt/fx_coordinates.h19
2 files changed, 32 insertions, 16 deletions
diff --git a/core/fxcrt/fx_coordinates.cpp b/core/fxcrt/fx_coordinates.cpp
index 561f25d4a6..733425ef26 100644
--- a/core/fxcrt/fx_coordinates.cpp
+++ b/core/fxcrt/fx_coordinates.cpp
@@ -17,10 +17,10 @@ void MatchFloatRange(float f1, float f2, int* i1, int* i2) {
int length = static_cast<int>(ceil(f2 - f1));
int i1_1 = static_cast<int>(floor(f1));
int i1_2 = static_cast<int>(ceil(f1));
- float error1 = f1 - i1_1 + (float)fabs(f2 - i1_1 - length);
- float error2 = i1_2 - f1 + (float)fabs(f2 - i1_2 - length);
+ float error1 = f1 - i1_1 + fabsf(f2 - i1_1 - length);
+ float error2 = i1_2 - f1 + fabsf(f2 - i1_2 - length);
- *i1 = (error1 > error2) ? i1_2 : i1_1;
+ *i1 = error1 > error2 ? i1_2 : i1_1;
*i2 = *i1 + length;
}
@@ -108,32 +108,29 @@ void CFX_FloatRect::Union(const CFX_FloatRect& other_rect) {
}
FX_RECT CFX_FloatRect::GetOuterRect() const {
- CFX_FloatRect rect1 = *this;
FX_RECT rect;
- rect.left = static_cast<int>(floor(rect1.left));
- rect.bottom = static_cast<int>(ceil(rect1.top));
- rect.right = static_cast<int>(ceil(rect1.right));
- rect.top = static_cast<int>(floor(rect1.bottom));
+ rect.left = static_cast<int>(floor(left));
+ rect.bottom = static_cast<int>(ceil(top));
+ rect.right = static_cast<int>(ceil(right));
+ rect.top = static_cast<int>(floor(bottom));
rect.Normalize();
return rect;
}
FX_RECT CFX_FloatRect::GetInnerRect() const {
- CFX_FloatRect rect1 = *this;
FX_RECT rect;
- rect.left = static_cast<int>(ceil(rect1.left));
- rect.bottom = static_cast<int>(floor(rect1.top));
- rect.right = static_cast<int>(floor(rect1.right));
- rect.top = static_cast<int>(ceil(rect1.bottom));
+ rect.left = static_cast<int>(ceil(left));
+ rect.bottom = static_cast<int>(floor(top));
+ rect.right = static_cast<int>(floor(right));
+ rect.top = static_cast<int>(ceil(bottom));
rect.Normalize();
return rect;
}
FX_RECT CFX_FloatRect::GetClosestRect() const {
- CFX_FloatRect rect1 = *this;
FX_RECT rect;
- MatchFloatRange(rect1.left, rect1.right, &rect.left, &rect.right);
- MatchFloatRange(rect1.bottom, rect1.top, &rect.top, &rect.bottom);
+ MatchFloatRange(left, right, &rect.left, &rect.right);
+ MatchFloatRange(bottom, top, &rect.top, &rect.bottom);
rect.Normalize();
return rect;
}
diff --git a/core/fxcrt/fx_coordinates.h b/core/fxcrt/fx_coordinates.h
index 1767e33f0c..55d28cd66f 100644
--- a/core/fxcrt/fx_coordinates.h
+++ b/core/fxcrt/fx_coordinates.h
@@ -247,9 +247,20 @@ class CFX_FloatRect {
void Intersect(const CFX_FloatRect& other_rect);
void Union(const CFX_FloatRect& other_rect);
+ // These may be better at rounding than ToFxRect() and friends.
+ //
+ // Returned rect has bounds rounded up/down such that it is contained in the
+ // original.
FX_RECT GetInnerRect() const;
+
+ // Returned rect has bounds rounded up/down such that the original is
+ // contained in it.
FX_RECT GetOuterRect() const;
+
+ // Returned rect has bounds rounded up/down such that the dimensions are
+ // rounded up and the sum of the error in the bounds is minimized.
FX_RECT GetClosestRect() const;
+
CFX_FloatRect GetCenterSquare() const;
void InitRect(const CFX_PointF& point) {
@@ -329,7 +340,15 @@ class CFX_FloatRect {
void Scale(float fScale);
void ScaleFromCenterPoint(float fScale);
+ // GetInnerRect() and friends may be better at rounding than these methods.
+ // Unlike the methods above, these two blindly floor / round the LBRT values.
+ // Doing so may introduce rounding errors that are visible to users as
+ // off-by-one pixels/lines.
+ //
+ // Floors LBRT values.
FX_RECT ToFxRect() const;
+
+ // Rounds LBRT values.
FX_RECT ToRoundedFxRect() const;
float left;