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

detect (and preserve) if patch colors are opaque

Browse Source 
Bug: skia:
Change-Id: Ida3a1ff3f78db2498a6dfc655d8be4de8ad912c7
Reviewed-on: https://skia-review.googlesource.com/17380
Reviewed-by: Jim Van Verth <jvanverth@google.com>
Commit-Queue: Mike Reed <reed@google.com>
This commit is contained in:
Mike Reed 2017-05-18 22:23:34 -04:00 committed by Skia Commit-Bot
parent b091c930e3
commit 7346a1f3b7
1 changed files with 14 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
src/utils/SkPatchUtils.cpp
View File

@ -242,15 +242,19 @@ sk_sp<SkVertices> SkPatchUtils::MakeVertices(const SkPoint cubics[12], const SkC
SkPoint* texs = builder.texCoords();
SkColor* colors = builder.colors();
uint16_t* indices = builder.indices();
bool is_opaque = false;
// if colors is not null then create array for colors
SkPMColor colorsPM[kNumCorners];
if (srcColors) {
SkColor c = ~0;
// premultiply colors to avoid color bleeding.
for (int i = 0; i < kNumCorners; i++) {
colorsPM[i] = SkPreMultiplyColor(srcColors[i]);
c &= srcColors[i];
}
srcColors = colorsPM;
is_opaque = (SkColorGetA(c) == 0xFF);
}
SkPoint pts[kNumPtsCubic];
@ -294,11 +298,16 @@ sk_sp<SkVertices> SkPatchUtils::MakeVertices(const SkPoint cubics[12], const SkC
pos[dataIndex] = s0 + s1 - s2;
if (colors) {
uint8_t a = uint8_t(bilerp(u, v,
SkScalar(SkColorGetA(colorsPM[kTopLeft_Corner])),
SkScalar(SkColorGetA(colorsPM[kTopRight_Corner])),
SkScalar(SkColorGetA(colorsPM[kBottomLeft_Corner])),
SkScalar(SkColorGetA(colorsPM[kBottomRight_Corner]))));
uint8_t a = 0xFF;
// We do the opaque check for speed, and to ensure that opaque stays opaque,
// in case we lose precision in the bilerp.
if (!is_opaque) {
a = uint8_t(bilerp(u, v,
SkScalar(SkColorGetA(colorsPM[kTopLeft_Corner])),
SkScalar(SkColorGetA(colorsPM[kTopRight_Corner])),
SkScalar(SkColorGetA(colorsPM[kBottomLeft_Corner])),
SkScalar(SkColorGetA(colorsPM[kBottomRight_Corner]))));
}
uint8_t r = uint8_t(bilerp(u, v,
SkScalar(SkColorGetR(colorsPM[kTopLeft_Corner])),
SkScalar(SkColorGetR(colorsPM[kTopRight_Corner])),