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ebiten: update comments

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Updates #2471
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Hajime Hoshi 2022-11-27 14:12:48 +09:00
parent 9aedafbb1a
commit d407607168
1 changed files with 11 additions and 5 deletions
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16
image.go
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@ -103,8 +103,11 @@ type DrawImageOptions struct {
GeoM GeoM GeoM GeoM
// ColorScale is a scale of color. // ColorScale is a scale of color.
// ColorScale is slightly different from ColorM's Scale in terms of alphas: //
// ColorScale is applied to premultiplied-alpha colors, while ColorM is applied to straight-alpha colors. // ColorScale is slightly different from colorm.ColorM's Scale in terms of alphas.
// ColorScale is applied to premultiplied-alpha colors, while colorm.ColorM is applied to straight-alpha colors.
// Thus, colorm.ColorM.Scale(r, g, b, a) equals to ColorScale.Scale(r*a, g*a, b*a, a).
//
// The default (zero) value is identity, which is (1, 1, 1, 1). // The default (zero) value is identity, which is (1, 1, 1, 1).
ColorScale ColorScale ColorScale ColorScale
@ -188,9 +191,12 @@ func (i *Image) adjustedRegion() graphicsdriver.Region {
// DrawImage works more efficiently as batches // DrawImage works more efficiently as batches
// when the successive calls of DrawImages satisfy the below conditions: // when the successive calls of DrawImages satisfy the below conditions:
// //
// - All render targets are same (A in A.DrawImage(B, op)) // - All render targets are the same (A in A.DrawImage(B, op))
// - All Blend values are same // - All Blend values are the same
// - All Filter values are same // - All Filter values are the same
//
// A whole image and its sub-image are considered to be the same, but some
// environments like browsers might not work efficiently (#2471).
// //
// Even when all the above conditions are satisfied, multiple draw commands can // Even when all the above conditions are satisfied, multiple draw commands can
// be used in really rare cases. Ebitengine images usually share an internal // be used in really rare cases. Ebitengine images usually share an internal