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Add tests for gamma correction of gradient stops to gamma GM

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Includes three different cases to exercise different cases in Ganesh.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2336973003

Review-Url: https://codereview.chromium.org/2336973003
This commit is contained in:
brianosman 2016-09-13 08:24:56 -07:00 committed by Commit bot
parent 54dc4878b0
commit 490452ec47
1 changed files with 52 additions and 11 deletions
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63
gm/gamma.cpp
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@ -11,7 +11,7 @@
#include "SkGradientShader.h"
#include "SkPM4fPriv.h"
DEF_SIMPLE_GM(gamma, canvas, 650, 200) {
DEF_SIMPLE_GM(gamma, canvas, 850, 200) {
SkPaint p;
const SkScalar sz = 50.0f;
const int szInt = SkScalarTruncToInt(sz);
@ -131,16 +131,57 @@ DEF_SIMPLE_GM(gamma, canvas, 650, 200) {
p.setColor(0xffbcbcbc);
nextRect("Color", 0);
// Black -> White gradient, scaled to sample just the middle.
// Tests gradient interpolation.
SkPoint points[2] = {
SkPoint::Make(0 - (sz * 10), 0),
SkPoint::Make(sz + (sz * 10), 0)
};
SkColor colors[2] = { SK_ColorBLACK, SK_ColorWHITE };
p.setShader(SkGradientShader::MakeLinear(points, colors, nullptr, 2,
SkShader::kClamp_TileMode));
nextRect("Gradient", 0);
{
// Black -> White gradient, scaled to sample just the middle.
// Tests gradient interpolation.
SkPoint points[2] = {
SkPoint::Make(0 - (sz * 10), 0),
SkPoint::Make(sz + (sz * 10), 0)
};
SkColor colors[2] = { SK_ColorBLACK, SK_ColorWHITE };
p.setShader(SkGradientShader::MakeLinear(points, colors, nullptr, 2,
SkShader::kClamp_TileMode));
nextRect("Gradient", "Interpolation");
}
{
// Shallow gradient around 50% (perceptual) gray. Endpoints are SkColor, so sRGB.
// Tests gamma-correction of gradient stops before interpolation in two-stop case
SkPoint points[2] = {
SkPoint::Make(0, 0),
SkPoint::Make(sz, 0)
};
SkColor colors[2] = { 0xffbbbbbb, 0xffbdbdbd };
p.setShader(SkGradientShader::MakeLinear(points, colors, nullptr, 2,
SkShader::kClamp_TileMode));
nextRect("Gradient", "Endpoints");
}
{
// Shallow 3-stop gradient around 50% (perceptual) gray. Endpoints are SkColor, so sRGB.
// Tests gamma-correction of gradient stops before interpolation in three-stop case
SkPoint points[2] = {
SkPoint::Make(0, 0),
SkPoint::Make(sz, 0)
};
SkColor colors[3] = { 0xffbbbbbb, 0xffbdbdbd, 0xffbbbbbb };
p.setShader(SkGradientShader::MakeLinear(points, colors, nullptr, 3,
SkShader::kClamp_TileMode));
nextRect("Gradient", "3-Stop");
}
{
// Shallow N-stop gradient around 50% (perceptual) gray. Endpoints are SkColor, so sRGB.
// Tests gamma-correction of gradient stops before interpolation in texture implementation
SkPoint points[2] = {
SkPoint::Make(0, 0),
SkPoint::Make(sz, 0)
};
SkColor colors[5] = { 0xffbbbbbb, 0xffbdbdbd, 0xffbbbbbb, 0xffbdbdbd, 0xffbbbbbb };
p.setShader(SkGradientShader::MakeLinear(points, colors, nullptr, 5,
SkShader::kClamp_TileMode));
nextRect("Gradient", "Texture");
}
// 50% grey from linear bitmap, with drawBitmap
nextBitmap(linearGreyBmp, "Lnr BMP");