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skia2/gm/arithmode.cpp
Herb Derby c37b386886 Replace SK_ARRAY_COUNT with std::size() for skia/gm 
Note: in variedtext.cpp:66 changed static_assert to SkASSERT.

Change-Id: I853a2e5563c90c9dde5d6ba5443cc73b664b493d
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/551876
Commit-Queue: Herb Derby <herb@google.com>
Reviewed-by: John Stiles <johnstiles@google.com>
2022-06-21 18:09:30 +00:00

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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "gm/gm.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkColor.h"
#include "include/core/SkFont.h"
#include "include/core/SkFontTypes.h"
#include "include/core/SkImage.h"
#include "include/core/SkImageFilter.h"
#include "include/core/SkPaint.h"
#include "include/core/SkPoint.h"
#include "include/core/SkRect.h"
#include "include/core/SkRefCnt.h"
#include "include/core/SkScalar.h"
#include "include/core/SkShader.h"
#include "include/core/SkSize.h"
#include "include/core/SkString.h"
#include "include/core/SkSurface.h"
#include "include/core/SkTileMode.h"
#include "include/core/SkTypeface.h"
#include "include/core/SkTypes.h"
#include "include/effects/SkGradientShader.h"
#include "include/effects/SkImageFilters.h"
#include "tools/ToolUtils.h"
#include <utility>
static sk_sp<SkImage> make_src(int w, int h) {
sk_sp<SkSurface> surface(SkSurface::MakeRasterN32Premul(w, h));
SkCanvas* canvas = surface->getCanvas();
SkPaint paint;
SkPoint pts[] = { {0, 0}, {SkIntToScalar(w), SkIntToScalar(h)} };
SkColor colors[] = {
SK_ColorTRANSPARENT, SK_ColorGREEN, SK_ColorCYAN,
SK_ColorRED, SK_ColorMAGENTA, SK_ColorWHITE,
};
paint.setShader(SkGradientShader::MakeLinear(pts, colors, nullptr, std::size(colors),
SkTileMode::kClamp));
canvas->drawPaint(paint);
return surface->makeImageSnapshot();
}
static sk_sp<SkImage> make_dst(int w, int h) {
sk_sp<SkSurface> surface(SkSurface::MakeRasterN32Premul(w, h));
SkCanvas* canvas = surface->getCanvas();
SkPaint paint;
SkPoint pts[] = { {0, SkIntToScalar(h)}, {SkIntToScalar(w), 0} };
SkColor colors[] = {
SK_ColorBLUE, SK_ColorYELLOW, SK_ColorBLACK, SK_ColorGREEN,
SK_ColorGRAY,
};
paint.setShader(SkGradientShader::MakeLinear(pts, colors, nullptr, std::size(colors),
SkTileMode::kClamp));
canvas->drawPaint(paint);
return surface->makeImageSnapshot();
}
static void show_k_text(SkCanvas* canvas, SkScalar x, SkScalar y, const SkScalar k[]) {
SkFont font(ToolUtils::create_portable_typeface(), 24);
font.setEdging(SkFont::Edging::kAntiAlias);
SkPaint paint;
paint.setAntiAlias(true);
for (int i = 0; i < 4; ++i) {
SkString str;
str.appendScalar(k[i]);
SkScalar width = font.measureText(str.c_str(), str.size(), SkTextEncoding::kUTF8);
canvas->drawString(str, x, y + font.getSize(), font, paint);
x += width + SkIntToScalar(10);
}
}
class ArithmodeGM : public skiagm::GM {
SkString onShortName() override { return SkString("arithmode"); }
SkISize onISize() override { return {640, 572}; }
void onDraw(SkCanvas* canvas) override {
constexpr int WW = 100,
HH = 32;
sk_sp<SkImage> src = make_src(WW, HH);
sk_sp<SkImage> dst = make_dst(WW, HH);
sk_sp<SkImageFilter> srcFilter = SkImageFilters::Image(src);
sk_sp<SkImageFilter> dstFilter = SkImageFilters::Image(dst);
constexpr SkScalar one = SK_Scalar1;
constexpr SkScalar K[] = {
0, 0, 0, 0,
0, 0, 0, one,
0, one, 0, 0,
0, 0, one, 0,
0, one, one, 0,
0, one, -one, 0,
0, one/2, one/2, 0,
0, one/2, one/2, one/4,
0, one/2, one/2, -one/4,
one/4, one/2, one/2, 0,
-one/4, one/2, one/2, 0,
};
const SkScalar* k = K;
const SkScalar* stop = k + std::size(K);
const SkRect rect = SkRect::MakeWH(WW, HH);
SkScalar gap = SkIntToScalar(WW + 20);
while (k < stop) {
{
SkAutoCanvasRestore acr(canvas, true);
canvas->drawImage(src, 0, 0);
canvas->translate(gap, 0);
canvas->drawImage(dst, 0, 0);
canvas->translate(gap, 0);
SkPaint paint;
paint.setImageFilter(SkImageFilters::Arithmetic(k[0], k[1], k[2], k[3], true,
dstFilter, srcFilter, nullptr));
canvas->saveLayer(&rect, &paint);
canvas->restore();
canvas->translate(gap, 0);
show_k_text(canvas, 0, 0, k);
}
k += 4;
canvas->translate(0, HH + 12);
}
// Draw two special cases to test enforcePMColor. In these cases, we
// draw the dst bitmap twice, the first time it is halved and inverted,
// leading to invalid premultiplied colors. If we enforcePMColor, these
// invalid values should be clamped, and will not contribute to the
// second draw.
for (int i = 0; i < 2; i++) {
const bool enforcePMColor = (i == 0);
{
SkAutoCanvasRestore acr(canvas, true);
canvas->translate(gap, 0);
canvas->drawImage(dst, 0, 0);
canvas->translate(gap, 0);
sk_sp<SkImageFilter> bg =
SkImageFilters::Arithmetic(0, 0, -one / 2, 1, enforcePMColor, dstFilter,
nullptr, nullptr);
SkPaint p;
p.setImageFilter(SkImageFilters::Arithmetic(0, one / 2, -one, 1, true,
std::move(bg), dstFilter, nullptr));
canvas->saveLayer(&rect, &p);
canvas->restore();
canvas->translate(gap, 0);
// Label
SkFont font(ToolUtils::create_portable_typeface(), 24);
SkString str(enforcePMColor ? "enforcePM" : "no enforcePM");
canvas->drawString(str, 0, font.getSize(), font, SkPaint());
}
canvas->translate(0, HH + 12);
}
}
private:
using INHERITED = GM;
};
DEF_GM( return new ArithmodeGM; )
///////////////////////////////////////////////////////////////////////////////
#include "include/effects/SkBlenders.h"
class Arithmode2GM : public skiagm::GM {
float fK1, fK2, fK3, fK4;
sk_sp<SkImage> fSrc, fDst, fChecker;
SkString onShortName() override { return SkString("arithmode_blender"); }
SkISize onISize() override { return {430, 430}; }
enum {
W = 200,
H = 200,
};
void onOnceBeforeDraw() override {
// need something interesting, in case we're drawn w/o calling animate()
fK1 = -0.25f;
fK2 = 0.25f;
fK3 = 0.25f;
fK4 = 0;
fSrc = make_src(W, H);
fDst = make_dst(W, H);
fChecker = ToolUtils::create_checkerboard_image(W, H, 0xFFBBBBBB, 0xFFEEEEEE, 8);
}
bool onAnimate(double nanos) override {
double theta = nanos * 1e-6 * 0.001;
fK1 = sin(theta + 0) * 0.25;
fK2 = cos(theta + 1) * 0.25;
fK3 = sin(theta + 2) * 0.25;
fK4 = 0.5;
return true;
}
void onDraw(SkCanvas* canvas) override {
const SkRect rect = SkRect::MakeWH(W, H);
canvas->drawImage(fSrc, 10, 10);
canvas->drawImage(fDst, 10, 10 + fSrc->height() + 10);
auto sampling = SkSamplingOptions();
auto blender = SkBlenders::Arithmetic(fK1, fK2, fK3, fK4, true);
SkPaint paint;
canvas->translate(10 + fSrc->width() + 10, 10);
canvas->drawImage(fChecker, 0, 0);
// Draw via blend step
canvas->saveLayer(&rect, nullptr);
canvas->drawImage(fDst, 0, 0);
paint.setBlender(blender);
canvas->drawImage(fSrc, 0, 0, sampling, &paint);
canvas->restore();
canvas->translate(0, 10 + fSrc->height());
canvas->drawImage(fChecker, 0, 0);
// Draw via imagefilter (should appear the same as above)
paint.setBlender(nullptr);
paint.setImageFilter(SkImageFilters::Blend(blender,
/* dst imagefilter */nullptr,
SkImageFilters::Image(fSrc, sampling)));
canvas->drawImage(fDst, 0, 0, sampling, &paint);
}
private:
using INHERITED = GM;
};
DEF_GM( return new Arithmode2GM; )
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