gm/p3.cpp - platform/external/skia - Gitiles

 /*
  * 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"

 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)) {
         MarkGMGood(canvas, 140,40);
         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].
         for (int i = 0; i < 4; ++i) {
             expected[i] = SkTPin(expected[i], 0.0f, 1.0f);
         }
     }
     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)) {
         MarkGMGood(canvas, 140,40);
     } else {
         MarkGMBad(canvas, 140,40);
     }

     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, 1300) {
     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 P3 red bitmap wrapped in a shader, 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*/));

         SkPaint paint;
         paint.setShader(SkShader::MakeBitmapShader(bm, SkShader::kRepeat_TileMode,
                                                    SkShader::kRepeat_TileMode));

         canvas->drawRect({10,10,70,70}, paint);
         compare_pixel("drawBitmapAsShader 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
 }
	/*
	* 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"

	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)) {
	MarkGMGood(canvas, 140,40);
	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].
	for (int i = 0; i < 4; ++i) {
	expected[i] = SkTPin(expected[i], 0.0f, 1.0f);
	}
	}
	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)) {
	MarkGMGood(canvas, 140,40);
	} else {
	MarkGMBad(canvas, 140,40);
	}

	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, 1300) {
	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 P3 red bitmap wrapped in a shader, 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/));

	SkPaint paint;
	paint.setShader(SkShader::MakeBitmapShader(bm, SkShader::kRepeat_TileMode,
	SkShader::kRepeat_TileMode));

	canvas->drawRect({10,10,70,70}, paint);
	compare_pixel("drawBitmapAsShader 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
	}