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skia2/samplecode/SampleRegion.cpp
John Stiles 1cf2c8d6ec Enable ClangTidy flag modernize-use-override. 
https://clang.llvm.org/extra/clang-tidy/checks/modernize-use-override.html

Adds override (introduced in C++11) to overridden virtual functions and
removes virtual from those functions as it is not required.

virtual on non base class implementations was used to help indicate to
the user that a function was virtual. C++ compilers did not use the
presence of this to signify an overridden function.

Change-Id: If66d8919358f72a4035190caf8d7569268037a9a
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/310160
Commit-Queue: Mike Klein <mtklein@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
2020-08-14 10:54:45 +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 "include/core/SkBitmap.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkFont.h"
#include "include/core/SkFontMetrics.h"
#include "include/core/SkPath.h"
#include "include/core/SkRegion.h"
#include "include/core/SkShader.h"
#include "include/effects/SkGradientShader.h"
#include "samplecode/Sample.h"
#include "src/utils/SkUTF.h"
#include <math.h>
static void test_strokerect(SkCanvas* canvas) {
int width = 100;
int height = 100;
SkBitmap bitmap;
bitmap.allocPixels(SkImageInfo::MakeA8(width*2, height*2));
bitmap.eraseColor(SK_ColorTRANSPARENT);
SkScalar dx = 20;
SkScalar dy = 20;
SkPath path;
path.addRect(0.0f, 0.0f,
SkIntToScalar(width), SkIntToScalar(height),
SkPathDirection::kCW);
SkRect r = SkRect::MakeWH(SkIntToScalar(width), SkIntToScalar(height));
SkCanvas c(bitmap);
c.translate(dx, dy);
SkPaint paint;
paint.setStyle(SkPaint::kStroke_Style);
paint.setStrokeWidth(1);
// use the rect
c.clear(SK_ColorTRANSPARENT);
c.drawRect(r, paint);
canvas->drawBitmap(bitmap, 0, 0, nullptr);
// use the path
c.clear(SK_ColorTRANSPARENT);
c.drawPath(path, paint);
canvas->drawBitmap(bitmap, SkIntToScalar(2*width), 0, nullptr);
}
static void drawFadingText(SkCanvas* canvas,
const char* text, size_t len, SkScalar x, SkScalar y,
const SkFont& font, const SkPaint& paint) {
// Need a bounds for the text
SkRect bounds;
SkFontMetrics fm;
font.getMetrics(&fm);
bounds.setLTRB(x, y + fm.fTop,
x + font.measureText(text, len, SkTextEncoding::kUTF8), y + fm.fBottom);
// may need to outset bounds a little, to account for hinting and/or
// antialiasing
bounds.inset(-SkIntToScalar(2), -SkIntToScalar(2));
canvas->saveLayer(&bounds, nullptr);
canvas->drawSimpleText(text, len, SkTextEncoding::kUTF8, x, y, font, paint);
const SkPoint pts[] = {
{ bounds.fLeft, y },
{ bounds.fRight, y }
};
const SkColor colors[] = { SK_ColorBLACK, SK_ColorBLACK, 0 };
// pos[1] value is where we start to fade, relative to the width
// of our pts[] array.
const SkScalar pos[] = { 0, 0.9f, SK_Scalar1 };
SkPaint p;
p.setShader(SkGradientShader::MakeLinear(pts, colors, pos, 3, SkTileMode::kClamp));
p.setBlendMode(SkBlendMode::kDstIn);
canvas->drawRect(bounds, p);
canvas->restore();
}
static void test_text(SkCanvas* canvas) {
SkPaint paint;
paint.setAntiAlias(true);
SkFont font;
font.setSize(20);
const char* str = "Hamburgefons";
size_t len = strlen(str);
SkScalar x = 20;
SkScalar y = 20;
canvas->drawSimpleText(str, len, SkTextEncoding::kUTF8, x, y, font, paint);
y += 20;
const SkPoint pts[] = { { x , y },
{ x + font.measureText(str, len, SkTextEncoding::kUTF8), y } };
const SkColor colors[] = { SK_ColorBLACK, SK_ColorBLACK, 0 };
const SkScalar pos[] = { 0, 0.9f, 1 };
paint.setShader(SkGradientShader::MakeLinear(pts, colors, pos,
SK_ARRAY_COUNT(colors),
SkTileMode::kClamp));
canvas->drawSimpleText(str, len, SkTextEncoding::kUTF8, x, y, font, paint);
y += 20;
paint.setShader(nullptr);
drawFadingText(canvas, str, len, x, y, font, paint);
}
static void scale_rect(SkIRect* dst, const SkIRect& src, float scale) {
dst->fLeft = (int)::roundf(src.fLeft * scale);
dst->fTop = (int)::roundf(src.fTop * scale);
dst->fRight = (int)::roundf(src.fRight * scale);
dst->fBottom = (int)::roundf(src.fBottom * scale);
}
static void scale_rgn(SkRegion* dst, const SkRegion& src, float scale) {
SkRegion tmp;
SkRegion::Iterator iter(src);
for (; !iter.done(); iter.next()) {
SkIRect r;
scale_rect(&r, iter.rect(), scale);
tmp.op(r, SkRegion::kUnion_Op);
}
dst->swap(tmp);
}
static void paint_rgn(SkCanvas* canvas, const SkRegion& rgn,
const SkPaint& paint) {
SkRegion scaled;
scale_rgn(&scaled, rgn, 0.5f);
SkRegion::Iterator iter(rgn);
for (; !iter.done(); iter.next())
{
SkRect r;
r.set(iter.rect());
canvas->drawRect(r, paint);
}
}
class RegionView : public Sample {
public:
RegionView() {
fBase.setLTRB(100, 100, 150, 150);
fRect = fBase;
fRect.inset(5, 5);
fRect.offset(25, 25);
this->setBGColor(0xFFDDDDDD);
}
void build_base_rgn(SkRegion* rgn) {
rgn->setRect(fBase);
SkIRect r = fBase;
r.offset(75, 20);
rgn->op(r, SkRegion::kUnion_Op);
}
void build_rgn(SkRegion* rgn, SkRegion::Op op) {
build_base_rgn(rgn);
rgn->op(fRect, op);
}
protected:
SkString name() override { return SkString("Regions"); }
static void drawstr(SkCanvas* canvas, const char text[], const SkPoint& loc,
bool hilite) {
SkPaint paint;
paint.setColor(hilite ? SK_ColorRED : 0x40FF0000);
SkFont font;
font.setSize(SkIntToScalar(20));
canvas->drawSimpleText(text, strlen(text), SkTextEncoding::kUTF8, loc.fX, loc.fY, font, paint);
}
void drawPredicates(SkCanvas* canvas, const SkPoint pts[]) {
SkRegion rgn;
build_base_rgn(&rgn);
drawstr(canvas, "Intersects", pts[0], rgn.intersects(fRect));
drawstr(canvas, "Contains", pts[1], rgn.contains(fRect));
}
void drawOrig(SkCanvas* canvas, bool bg) {
SkRect r;
SkPaint paint;
paint.setStyle(SkPaint::kStroke_Style);
if (bg)
paint.setColor(0xFFBBBBBB);
SkRegion rgn;
build_base_rgn(&rgn);
paint_rgn(canvas, rgn, paint);
r.set(fRect);
canvas->drawRect(r, paint);
}
void drawRgnOped(SkCanvas* canvas, SkRegion::Op op, SkColor color) {
SkRegion rgn;
this->build_rgn(&rgn, op);
{
SkRegion tmp = rgn;
tmp.translate(5, -3);
{
char buffer[1000];
SkDEBUGCODE(size_t size = ) tmp.writeToMemory(nullptr);
SkASSERT(size <= sizeof(buffer));
SkDEBUGCODE(size_t size2 = ) tmp.writeToMemory(buffer);
SkASSERT(size == size2);
SkRegion tmp3;
SkDEBUGCODE(size2 = ) tmp3.readFromMemory(buffer, 1000);
SkASSERT(size == size2);
SkASSERT(tmp3 == tmp);
}
rgn.translate(20, 30, &tmp);
SkASSERT(rgn.isEmpty() || tmp != rgn);
tmp.translate(-20, -30);
SkASSERT(tmp == rgn);
}
this->drawOrig(canvas, true);
SkPaint paint;
paint.setColor((color & ~(0xFF << 24)) | (0x44 << 24));
paint_rgn(canvas, rgn, paint);
paint.setStyle(SkPaint::kStroke_Style);
paint.setColor(color);
paint_rgn(canvas, rgn, paint);
}
void drawPathOped(SkCanvas* canvas, SkRegion::Op op, SkColor color) {
SkRegion rgn;
SkPath path;
this->build_rgn(&rgn, op);
rgn.getBoundaryPath(&path);
this->drawOrig(canvas, true);
SkPaint paint;
paint.setStyle(SkPaint::kFill_Style);
paint.setColor((color & ~(0xFF << 24)) | (0x44 << 24));
canvas->drawPath(path, paint);
paint.setColor(color);
paint.setStyle(SkPaint::kStroke_Style);
canvas->drawPath(path, paint);
}
void onDrawContent(SkCanvas* canvas) override {
if (false) { // avoid bit rot, suppress warning
test_strokerect(canvas);
return;
}
if (false) { // avoid bit rot, suppress warning
test_text(canvas);
return;
}
const SkPoint origins[] = {
{ 30*SK_Scalar1, 50*SK_Scalar1 },
{ 150*SK_Scalar1, 50*SK_Scalar1 },
};
this->drawPredicates(canvas, origins);
static const struct {
SkColor fColor;
const char* fName;
SkRegion::Op fOp;
} gOps[] = {
{ SK_ColorBLACK, "Difference", SkRegion::kDifference_Op },
{ SK_ColorRED, "Intersect", SkRegion::kIntersect_Op },
{ 0xFF008800, "Union", SkRegion::kUnion_Op },
{ SK_ColorBLUE, "XOR", SkRegion::kXOR_Op }
};
SkFont font;
font.setSize(SK_Scalar1*24);
this->drawOrig(canvas, false);
canvas->save();
canvas->translate(SkIntToScalar(200), 0);
this->drawRgnOped(canvas, SkRegion::kUnion_Op, SK_ColorBLACK);
canvas->restore();
canvas->translate(0, SkIntToScalar(200));
for (size_t op = 0; op < SK_ARRAY_COUNT(gOps); op++) {
canvas->drawSimpleText(gOps[op].fName, strlen(gOps[op].fName), SkTextEncoding::kUTF8,
SkIntToScalar(75), SkIntToScalar(50), font, SkPaint());
this->drawRgnOped(canvas, gOps[op].fOp, gOps[op].fColor);
canvas->save();
canvas->translate(0, SkIntToScalar(200));
this->drawPathOped(canvas, gOps[op].fOp, gOps[op].fColor);
canvas->restore();
canvas->translate(SkIntToScalar(200), 0);
}
}
Sample::Click* onFindClickHandler(SkScalar x, SkScalar y, skui::ModifierKey modi) override {
return fRect.contains(SkScalarRoundToInt(x),
SkScalarRoundToInt(y)) ? new Click() : nullptr;
}
bool onClick(Click* click) override {
fRect.offset(click->fCurr.fX - click->fPrev.fX,
click->fCurr.fY - click->fPrev.fY);
return true;
}
private:
SkIRect fBase, fRect;
typedef Sample INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
DEF_SAMPLE( return new RegionView(); )
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