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skia2/gm/p3.cpp
Mike Klein eee8315ed0 add (e)sRGB gradients to P3 GM 
At the moment I'm actually a bit confused about
why the new pair of gradients appear to interpolate
in P3 when drawn in --config 8888.

--config gl works as I'd expect, interpolating the
existing gradients in P3 and the new gradients in
sRGB.

Change-Id: I74b77d834b495a7545753b76c8fd8ecaeb5c7b70
Reviewed-on: https://skia-review.googlesource.com/c/161586
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
Auto-Submit: Mike Klein <mtklein@google.com>
2018-10-12 21:05:30 +00:00

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/*
* Copyright 2018 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "gm.h"
#include "SkColorSpace.h"
#include "SkColorSpaceXformSteps.h"
#include "SkGradientShader.h"
#include "SkString.h"
template <typename Fn>
static void mark(SkCanvas* canvas, Fn&& fn) {
SkPaint alpha;
alpha.setAlpha(0x50);
canvas->saveLayer(nullptr, &alpha);
canvas->translate(140,40);
canvas->scale(2,2);
fn();
canvas->restore();
}
static void mark_good(SkCanvas* canvas) {
mark(canvas, [&]{
SkPaint paint;
// A green circle.
paint.setColor(SkColorSetRGB(27, 158, 119));
canvas->drawCircle(0,0, 12, paint);
// Cut out a check mark.
paint.setBlendMode(SkBlendMode::kSrc);
paint.setColor(0x00000000);
paint.setStrokeWidth(2);
paint.setStyle(SkPaint::kStroke_Style);
canvas->drawLine(-6, 0,
-1, 5, paint);
canvas->drawLine(-1, +5,
+7, -5, paint);
});
}
static void mark_bad(SkCanvas* canvas) {
mark(canvas, [&] {
SkPaint paint;
// A red circle.
paint.setColor(SkColorSetRGB(231, 41, 138));
canvas->drawCircle(0,0, 12, paint);
// Cut out an 'X'.
paint.setBlendMode(SkBlendMode::kSrc);
paint.setColor(0x00000000);
paint.setStrokeWidth(2);
paint.setStyle(SkPaint::kStroke_Style);
canvas->drawLine(-5,-5,
+5,+5, paint);
canvas->drawLine(+5,-5,
-5,+5, paint);
});
}
static bool nearly_equal(SkColor4f x, SkColor4f y) {
const float K = 0.01f;
return fabsf(x.fR - y.fR) < K
&& fabsf(x.fG - y.fG) < K
&& fabsf(x.fB - y.fB) < K
&& fabsf(x.fA - y.fA) < K;
}
static SkString fmt(SkColor4f c) {
return SkStringPrintf("%.2g %.2g %.2g %.2g", c.fR, c.fG, c.fB, c.fA);
}
static SkColor4f transform(SkColor4f c, SkColorSpace* src, SkColorSpace* dst) {
SkColorSpaceXformSteps(src, kUnpremul_SkAlphaType,
dst, kUnpremul_SkAlphaType).apply(c.vec());
return c;
}
static void compare_pixel(const char* label,
SkCanvas* canvas, int x, int y,
SkColor4f color, SkColorSpace* cs) {
SkPaint text;
text.setAntiAlias(true);
auto canvas_cs = canvas->imageInfo().refColorSpace();
// I'm not really sure if this makes things easier or harder to follow,
// but we sniff the canvas to grab its current y-translate, so that (x,y)
// can be written in sort of chunk-relative terms.
const SkMatrix& m = canvas->getTotalMatrix();
SkASSERT(m.isTranslate());
SkScalar dy = m.getTranslateY();
SkASSERT(dy == (int)dy);
y += (int)dy;
SkBitmap bm;
bm.allocPixels(SkImageInfo::Make(1,1, kRGBA_F32_SkColorType, kUnpremul_SkAlphaType, canvas_cs));
if (!canvas->readPixels(bm, x,y)) {
mark_good(canvas);
canvas->drawString("can't readPixels() on this canvas :(", 100,20, text);
return;
}
SkColor4f pixel;
memcpy(&pixel, bm.getAddr(0,0), sizeof(pixel));
SkColor4f expected = transform(color,cs, canvas_cs.get());
if (canvas->imageInfo().colorType() < kRGBA_F16_SkColorType) {
// We can't expect normalized formats to hold values outside [0,1].
expected = expected.pin();
}
if (canvas->imageInfo().colorType() == kGray_8_SkColorType) {
// Drawing into Gray8 is known to be maybe-totally broken.
// TODO: update expectation here to be {lum,lum,lum,1} if we fix Gray8.
expected = SkColor4f{NAN, NAN, NAN, 1};
}
if (nearly_equal(pixel, expected)) {
mark_good(canvas);
} else {
mark_bad(canvas);
}
struct {
const char* label;
SkColor4f color;
} lines[] = {
{"Pixel:" , pixel },
{"Expected:", expected},
};
SkAutoCanvasRestore saveRestore(canvas, true);
canvas->drawString(label, 80,20, text);
for (auto l : lines) {
canvas->translate(0,20);
canvas->drawString(l.label, 80,20, text);
canvas->drawString(fmt(l.color).c_str(), 140,20, text);
}
}
DEF_SIMPLE_GM(p3, canvas, 450, 1200) {
auto p3 = SkColorSpace::MakeRGB(SkColorSpace::kSRGB_RenderTargetGamma,
SkColorSpace::kDCIP3_D65_Gamut);
auto srgb = SkColorSpace::MakeSRGB();
auto p3_to_srgb = [&](SkColor4f c) {
SkPaint p;
p.setColor4f(c, p3.get());
return p.getColor4f();
};
// Draw a P3 red rectangle and check the corner.
{
SkPaint paint;
paint.setColor4f({1,0,0,1}, p3.get());
canvas->drawRect({10,10,70,70}, paint);
compare_pixel("drawRect P3 red ",
canvas, 10,10,
{1,0,0,1}, p3.get());
}
canvas->translate(0,80);
// Draw a P3 red bitmap, using a draw.
{
SkBitmap bm;
bm.allocPixels(SkImageInfo::Make(60,60, kRGBA_F16_SkColorType, kPremul_SkAlphaType, p3));
SkPaint paint;
paint.setColor4f({1,0,0,1}, p3.get());
SkCanvas{bm}.drawPaint(paint);
canvas->drawBitmap(bm, 10,10);
compare_pixel("drawBitmap P3 red, from drawPaint",
canvas, 10,10,
{1,0,0,1}, p3.get());
}
canvas->translate(0,80);
// Draw a P3 red bitmap, using SkBitmap::eraseColor().
{
SkBitmap bm;
bm.allocPixels(SkImageInfo::Make(60,60, kRGBA_F16_SkColorType, kPremul_SkAlphaType, p3));
bm.eraseColor(0xffff0000/*in P3*/);
canvas->drawBitmap(bm, 10,10);
compare_pixel("drawBitmap P3 red, from SkBitmap::eraseColor()",
canvas, 10,10,
{1,0,0,1}, p3.get());
}
canvas->translate(0,80);
// Draw a P3 red bitmap, using SkPixmap::erase().
{
SkBitmap bm;
bm.allocPixels(SkImageInfo::Make(60,60, kRGBA_F16_SkColorType, kPremul_SkAlphaType, p3));
// At the moment only SkPixmap has an erase() that takes an SkColor4f.
SkPixmap pm;
SkAssertResult(bm.peekPixels(&pm));
SkAssertResult(pm.erase({1,0,0,1} /*in p3*/));
canvas->drawBitmap(bm, 10,10);
compare_pixel("drawBitmap P3 red, from SkPixmap::erase",
canvas, 10,10,
{1,0,0,1}, p3.get());
}
canvas->translate(0,80);
// Draw a gradient from P3 red to P3 green interpolating in unpremul P3, checking the corners.
{
SkPoint points[] = {{10.5,10.5}, {69.5,69.5}};
SkColor4f colors[] = {{1,0,0,1}, {0,1,0,1}};
SkPaint paint;
paint.setShader(SkGradientShader::MakeLinear(points, colors, p3,
nullptr, SK_ARRAY_COUNT(colors),
SkShader::kClamp_TileMode));
canvas->drawRect({10,10,70,70}, paint);
canvas->save();
compare_pixel("UPM P3 gradient, P3 red",
canvas, 10,10,
{1,0,0,1}, p3.get());
canvas->translate(180, 0);
compare_pixel("UPM P3 gradient, P3 green",
canvas, 69,69,
{0,1,0,1}, p3.get());
canvas->restore();
}
canvas->translate(0,80);
// Draw a gradient from P3 red to P3 green interpolating in premul P3, checking the corners.
{
SkPoint points[] = {{10.5,10.5}, {69.5,69.5}};
SkColor4f colors[] = {{1,0,0,1}, {0,1,0,1}};
SkPaint paint;
paint.setShader(
SkGradientShader::MakeLinear(points, colors, p3,
nullptr, SK_ARRAY_COUNT(colors),
SkShader::kClamp_TileMode,
SkGradientShader::kInterpolateColorsInPremul_Flag,
nullptr/*local matrix*/));
canvas->drawRect({10,10,70,70}, paint);
canvas->save();
compare_pixel("PM P3 gradient, P3 red",
canvas, 10,10,
{1,0,0,1}, p3.get());
canvas->translate(180, 0);
compare_pixel("PM P3 gradient, P3 green",
canvas, 69,69,
{0,1,0,1}, p3.get());
canvas->restore();
}
canvas->translate(0,80);
// Draw a gradient from P3 red to P3 green interpolating in unpremul sRGB, checking the corners.
{
SkPoint points[] = {{10.5,10.5}, {69.5,69.5}};
SkColor4f colors[] = {p3_to_srgb({1,0,0,1}), p3_to_srgb({0,1,0,1})};
SkPaint paint;
paint.setShader(SkGradientShader::MakeLinear(points, colors, srgb,
nullptr, SK_ARRAY_COUNT(colors),
SkShader::kClamp_TileMode));
canvas->drawRect({10,10,70,70}, paint);
canvas->save();
compare_pixel("UPM sRGB gradient, P3 red",
canvas, 10,10,
{1,0,0,1}, p3.get());
canvas->translate(180, 0);
compare_pixel("UPM sRGB gradient, P3 green",
canvas, 69,69,
{0,1,0,1}, p3.get());
canvas->restore();
}
canvas->translate(0,80);
// Draw a gradient from P3 red to P3 green interpolating in premul sRGB, checking the corners.
{
SkPoint points[] = {{10.5,10.5}, {69.5,69.5}};
SkColor4f colors[] = {p3_to_srgb({1,0,0,1}), p3_to_srgb({0,1,0,1})};
SkPaint paint;
paint.setShader(
SkGradientShader::MakeLinear(points, colors, srgb,
nullptr, SK_ARRAY_COUNT(colors),
SkShader::kClamp_TileMode,
SkGradientShader::kInterpolateColorsInPremul_Flag,
nullptr/*local matrix*/));
canvas->drawRect({10,10,70,70}, paint);
canvas->save();
compare_pixel("PM P3 gradient, P3 red",
canvas, 10,10,
{1,0,0,1}, p3.get());
canvas->translate(180, 0);
compare_pixel("PM P3 gradient, P3 green",
canvas, 69,69,
{0,1,0,1}, p3.get());
canvas->restore();
}
canvas->translate(0,80);
// Draw an A8 image with a P3 red, scaled and not, as a shader or bitmap.
{
uint8_t mask[256];
for (int i = 0; i < 256; i++) {
mask[i] = 255-i;
}
SkBitmap bm;
bm.installPixels(SkImageInfo::MakeA8(16,16), mask, 16);
SkPaint as_bitmap;
as_bitmap.setColor4f({1,0,0,1}, p3.get());
as_bitmap.setFilterQuality(kLow_SkFilterQuality);
SkPaint as_shader;
as_shader.setColor4f({1,0,0,1}, p3.get());
as_shader.setFilterQuality(kLow_SkFilterQuality);
as_shader.setShader(SkShader::MakeBitmapShader(bm, SkShader::kClamp_TileMode
, SkShader::kClamp_TileMode));
canvas->drawBitmap(bm, 10,10, &as_bitmap);
compare_pixel("A8 sprite bitmap P3 red",
canvas, 10,10,
{1,0,0,1}, p3.get());
canvas->translate(0, 80);
canvas->save();
canvas->translate(10,10);
canvas->drawRect({0,0,16,16}, as_shader);
canvas->restore();
compare_pixel("A8 sprite shader P3 red",
canvas, 10,10,
{1,0,0,1}, p3.get());
canvas->translate(0,80);
canvas->drawBitmapRect(bm, {10,10,70,70}, &as_bitmap);
compare_pixel("A8 scaled bitmap P3 red",
canvas, 10,10,
{1,0,0,1}, p3.get());
canvas->translate(0,80);
canvas->save();
canvas->translate(10,10);
canvas->scale(3.75,3.75);
canvas->drawRect({0,0,16,16}, as_shader);
canvas->restore();
compare_pixel("A8 scaled shader P3 red",
canvas, 10,10,
{1,0,0,1}, p3.get());
}
// TODO: draw P3 colors more ways
}
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