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Fix Canvas#drawVertices color blending when no shader is provided

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Since https://skia-review.googlesource.com/c/skia/+/473676, Skia will
blend paint and vertex colors when no shader is provided. This fix
mimics the old behavior of ignoring the paint and using the vertex
colors directly when no shader is provided.

Additionally, centralizes some legacy compatability logic of disabling
the shader if no texs array is provided. I think this simplifies the
logic/cognitive overhead of understanding what compatability tweaks are
being made to the call.

Tests added in Iddb4d2a3872b905684ec57c0e039d0bd0ca64a71
Test: atest ExactCanvasTests

Fix: 239398877

Change-Id: Ie9a6389b422cc0c315485d8a8097314cb6706538
This commit is contained in:
Nolan Scobie
2022-07-28 16:37:25 +00:00
parent a9aaecab10
commit a21bbb027a
1 changed files with 21 additions and 7 deletions
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28
libs/hwui/jni/android_graphics_Canvas.cpp
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@@ -407,14 +407,28 @@ static void drawVertices(JNIEnv* env, jobject, jlong canvasHandle,
indices = (const uint16_t*)(indexA.ptr() + indexIndex);
}
SkVertices::VertexMode mode = static_cast<SkVertices::VertexMode>(modeHandle);
SkVertices::VertexMode vertexMode = static_cast<SkVertices::VertexMode>(modeHandle);
const Paint* paint = reinterpret_cast<Paint*>(paintHandle);
get_canvas(canvasHandle)->drawVertices(SkVertices::MakeCopy(mode, vertexCount,
reinterpret_cast<const SkPoint*>(verts),
reinterpret_cast<const SkPoint*>(texs),
reinterpret_cast<const SkColor*>(colors),
indexCount, indices).get(),
SkBlendMode::kModulate, *paint);
// Preserve legacy Skia behavior: ignore the shader if there are no texs set.
Paint noShaderPaint;
if (jtexs == NULL) {
noShaderPaint = Paint(*paint);
noShaderPaint.setShader(nullptr);
paint = &noShaderPaint;
}
// Since https://skia-review.googlesource.com/c/skia/+/473676, Skia will blend paint and vertex
// colors when no shader is provided. This ternary uses kDst to mimic the old behavior of
// ignoring the paint and using the vertex colors directly when no shader is provided.
SkBlendMode blendMode = paint->getShader() ? SkBlendMode::kModulate : SkBlendMode::kDst;
get_canvas(canvasHandle)
->drawVertices(SkVertices::MakeCopy(
vertexMode, vertexCount, reinterpret_cast<const SkPoint*>(verts),
reinterpret_cast<const SkPoint*>(texs),
reinterpret_cast<const SkColor*>(colors), indexCount, indices)
.get(),
blendMode, *paint);
}
static void drawNinePatch(JNIEnv* env, jobject, jlong canvasHandle, jlong bitmapHandle,