skia2/gm/crbug_224618.cpp
Mike Reed db301b73f8 restore til I understand what changed
Change-Id: I58abeb7405cdefe6d9882b7c9977e051143fcb67
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/266716
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
2020-01-26 02:01:50 +00:00

102 lines
3.5 KiB
C++

/*
* Copyright 2020 Google LLC
*
* 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/SkMatrix.h"
#include "include/core/SkMatrix44.h"
#include "include/private/SkM44.h"
#include "tools/timer/TimeUtils.h"
static SkM44 rotate_axis_angle(SkScalar x, SkScalar y, SkScalar z, SkScalar radians) {
// SkM44 doesn't expose any rotation factories yet
SkMatrix44 m;
m.setRotateAboutUnit(x, y, z, radians);
float a[16];
m.asColMajorf(a);
SkM44 m4;
m4.setColMajor(a);
return m4;
}
// Adapted from https://codepen.io/adamdupuis/pen/qLYzqB
class CrBug224618GM : public skiagm::GM {
public:
CrBug224618GM() : fTime(0.f) {}
protected:
SkString onShortName() override {
return SkString("crbug_224618");
}
SkISize onISize() override {
return SkISize::Make(kMaxVW, kMaxVW);
}
// This animates the FOV in viewer, to ensure the panorama covering rects are stable across
// a variety of perspective matrices
bool onAnimate(double nanos) override {
fTime = TimeUtils::Scaled(1e-9f * nanos, 0.5f);
return true;
}
void onDraw(SkCanvas* canvas) override {
SkScalar viewportWidth = SkScalarMod(fTime, 10.f) / 10.f * (kMaxVW - kMinVW) + kMinVW;
SkScalar radius = viewportWidth / 2.f; // round?
// See https://developer.mozilla.org/en-US/docs/Web/CSS/transform-function/perspective
SkM44 proj{1.f, 0.f, 0.f, 0.f,
0.f, 1.f, 0.f, 0.f,
0.f, 0.f, 1.f, 0.f,
0.f, 0.f, -1.f / radius, 1.f};
SkM44 zoom = SkM44::Translate(0.f, 0.f, radius);
SkM44 postZoom = SkM44::Translate(0.f, 0.f, -radius - 1.f);
SkM44 rotateHorizontal = rotate_axis_angle(0.f, 1.f, 0.f, 2.356194490192345f);
// w in degrees will need to be converted to radians
SkV4 axisAngles[6] = {
{0.f, 1.f, 0.f, -90.f}, // rotateY(-90deg)
{1.f, 0.f, 0.f, 0.f}, // <none>
{0.f, 1.f, 0.f, 90.f}, // rotateY(90deg)
{0.f, 1.f, 0.f, 180.f}, // rotateY(180deg)
{1.f, 0.f, 0.f, -90.f}, // rotateX(-90deg)
{1.f, 0.f, 0.f, 90.f}, // rotateX(90deg)
};
SkColor faceColors[6] = {
SK_ColorRED,
SK_ColorGREEN,
SK_ColorBLUE,
SK_ColorYELLOW,
SkColorSetARGB(0xFF, 0xFF, 0xA5, 0x00), // orange css
SkColorSetARGB(0xFF, 0x80, 0x00, 0x80) // purple css
};
for (int i = 0; i < 6; ++i) {
SkM44 model = rotate_axis_angle(axisAngles[i].x, axisAngles[i].y, axisAngles[i].z,
SkDegreesToRadians(axisAngles[i].w));
model = SkM44::Translate(radius, radius) * proj * // project and place content
zoom * rotateHorizontal * model * postZoom * // main model matrix
SkM44::Translate(-radius, -radius); // center content
canvas->save();
canvas->experimental_concat44(model);
SkPaint fillPaint;
fillPaint.setAntiAlias(true);
fillPaint.setColor(faceColors[i]);
canvas->drawRect(SkRect::MakeWH(viewportWidth, viewportWidth), fillPaint);
canvas->restore();
}
}
private:
static const int kMaxVW = 800;
static const int kMinVW = 300;
SkScalar fTime;
};
DEF_GM(return new CrBug224618GM();)