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Add gm to test HSL modes, esp. with src-alpha

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Note: the results (esp. Saturation) don't exactly match the reference
images in the W3 spec. However, if I tell viewer to be in P3 colorspace,
then the gm looks (nearly) identical to florin's codepen (when viewed
on a P3 iMac).

Change-Id: Iecf21b3078f079eb30af59d697b97b64091c585c
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/278416
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Mike Reed <reed@google.com>
This commit is contained in:
Mike Reed 2020-03-21 10:27:53 -04:00 committed by Skia Commit-Bot
parent 7e9d6f43c1
commit bd1db41bd8
1 changed files with 69 additions and 0 deletions
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69
gm/hsl.cpp
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@ -13,6 +13,7 @@
#include "include/core/SkPaint.h"
#include "include/core/SkTypeface.h"
#include "include/core/SkTypes.h"
#include "tools/Resources.h"
#include "tools/ToolUtils.h"
// Hue, Saturation, Color, and Luminosity blend modes are oddballs.
@ -191,3 +192,71 @@ DEF_SIMPLE_GM(hsl, canvas, 600, 100) {
canvas->translate(100,0);
}
}
#include "include/effects/SkGradientShader.h"
// Trying to match sample images on https://www.w3.org/TR/compositing-1/#blendingnonseparable
//
static sk_sp<SkShader> make_grad(SkScalar width) {
SkColor colors[] = {
0xFF00CCCC, 0xFF0000CC, 0xFFCC00CC, 0xFFCC0000, 0xFFCCCC00, 0xFF00CC00,
};
SkPoint pts[] = {{0, 0}, {width, 0}};
return SkGradientShader::MakeLinear(pts, colors, nullptr, SK_ARRAY_COUNT(colors),
SkTileMode::kClamp);
}
DEF_SIMPLE_GM(HSL_duck, canvas, 1110, 620) {
auto src = GetResourceAsImage("ducky.png");
auto dst = make_grad(src->width());
SkRect r = SkRect::MakeIWH(src->width(), src->height());
canvas->translate(10, 50);
canvas->scale(0.5f, 0.5f);
const struct {
SkBlendMode fMode;
const char* fName;
} recs[] = {
{ SkBlendMode::kHue, "Hue" },
{ SkBlendMode::kSaturation, "Saturation" },
{ SkBlendMode::kColor, "Color" },
{ SkBlendMode::kLuminosity, "Luminosity" },
};
SkFont font;
font.setSize(40);
font.setEdging(SkFont::Edging::kAntiAlias);
canvas->save();
for (auto [_, name] : recs) {
canvas->drawSimpleText(name, strlen(name), SkTextEncoding::kUTF8, 150, -20,
font, SkPaint());
canvas->translate(r.width() + 10, 0);
}
canvas->restore();
for (SkScalar src_a : {1.0f, 0.5f}) {
canvas->save();
for (auto [mode, _] : recs) {
SkPaint p;
p.setShader(dst);
canvas->drawRect(r, p); // bg
p.setShader(nullptr);
p.setBlendMode(mode);
p.setAlphaf(src_a);
canvas->drawImageRect(src, r, &p);
canvas->translate(r.width() + 10, 0);
}
SkString str;
str.printf("alpha %g", src_a);
canvas->drawSimpleText(str.c_str(), str.size(), SkTextEncoding::kUTF8, 10, r.height()/2,
font, SkPaint());
canvas->restore();
canvas->translate(0, r.height() + 10);
}
}