blob: ba482bd8f3204c26a35ab2373d1334e8705c2476 [file] [log] [blame]
/*
* Copyright 2020 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/SkPaint.h"
#include "include/core/SkPoint.h"
#include "include/core/SkRect.h"
#include "include/core/SkScalar.h"
#include "include/core/SkShader.h"
#include "include/core/SkSize.h"
#include "include/core/SkString.h"
#include "include/core/SkTypeface.h"
#include "tools/ToolUtils.h"
#include "modules/skparagraph/include/Paragraph.h"
#include "modules/skparagraph/src/ParagraphBuilderImpl.h"
static const char* gSpeach = "Five score years ago, a great American, in whose symbolic shadow we stand today, signed the Emancipation Proclamation. This momentous decree came as a great beacon light of hope to millions of Negro slaves who had been seared in the flames of withering injustice. It came as a joyous daybreak to end the long night of their captivity.";
namespace {
enum ParaFlags {
kTimeLayout = 1 << 0,
kUseUnderline = 1 << 1,
kShowVisitor = 1 << 2,
};
} // namespace
class ParagraphGM : public skiagm::GM {
std::unique_ptr<skia::textlayout::Paragraph> fPara;
const unsigned fFlags;
public:
ParagraphGM(unsigned flags) : fFlags(flags) {}
void buildParagraph() {
skia::textlayout::TextStyle style;
style.setForegroundColor(SkPaint());
style.setFontFamilies({SkString("sans-serif")});
style.setFontSize(30);
if (fFlags & kUseUnderline) {
style.setDecoration(skia::textlayout::TextDecoration::kUnderline);
style.setDecorationMode(skia::textlayout::TextDecorationMode::kThrough);
style.setDecorationColor(SK_ColorBLACK);
style.setDecorationThicknessMultiplier(2);
}
skia::textlayout::ParagraphStyle paraStyle;
paraStyle.setTextStyle(style);
auto collection = sk_make_sp<skia::textlayout::FontCollection>();
collection->setDefaultFontManager(SkFontMgr::RefDefault());
auto builder = skia::textlayout::ParagraphBuilderImpl::make(
paraStyle, collection, SkUnicode::Make());
if (nullptr == builder) {
fPara = nullptr;
return;
}
builder->addText(gSpeach, strlen(gSpeach));
fPara = builder->Build();
fPara->layout(400);
}
protected:
void onOnceBeforeDraw() override {
this->buildParagraph();
}
SkString onShortName() override {
SkString name;
name.printf("paragraph%s_%s",
fFlags & kTimeLayout ? "_layout" : "",
fFlags & kUseUnderline ? "_underline" : "");
if (fFlags & kShowVisitor) {
name.append("_visitor");
}
return name;
}
SkISize onISize() override {
if (fFlags & kShowVisitor) {
return SkISize::Make(810, 420);
}
return SkISize::Make(412, 420);
}
void drawFromVisitor(SkCanvas* canvas, skia::textlayout::Paragraph* para) const {
SkPaint p, p2;
p.setColor(0xFF0000FF);
p2.setColor(0xFFFF0000);
p2.setStrokeWidth(4);
p2.setStrokeCap(SkPaint::kSquare_Cap);
SkPaint underp;
underp.setStroke(true);
underp.setStrokeWidth(2);
underp.setAntiAlias(true);
underp.setColor(p.getColor());
const SkScalar GAP = 2;
para->visit([&](int, const skia::textlayout::Paragraph::VisitorInfo* info) {
if (!info) {
return;
}
canvas->drawGlyphs(info->count, info->glyphs, info->positions, info->origin,
info->font, p);
if (fFlags & kUseUnderline) {
// Need to modify positions to roll-in the orign
std::vector<SkPoint> pos;
for (int i = 0; i < info->count; ++i) {
pos.push_back({info->origin.fX + info->positions[i].fX,
info->origin.fY + info->positions[i].fY});
}
const SkScalar X0 = pos[0].fX;
const SkScalar X1 = X0 + info->advanceX;
const SkScalar Y = pos[0].fY;
auto sects = info->font.getIntercepts(info->glyphs, info->count, pos.data(),
Y+1, Y+3);
SkScalar x0 = X0;
for (size_t i = 0; i < sects.size(); i += 2) {
SkScalar x1 = sects[i] - GAP;
if (x0 < x1) {
canvas->drawLine(x0, Y+2, x1, Y+2, underp);
}
x0 = sects[i+1] + GAP;
}
canvas->drawLine(x0, Y+2, X1, Y+2, underp);
}
if ((false)) {
if (info->utf8Starts) {
SkString str;
for (int i = 0; i < info->count; ++i) {
str.appendUnichar(gSpeach[info->utf8Starts[i]]);
}
SkDebugf("'%s'\n", str.c_str());
}
// show position points
for (int i = 0; i < info->count; ++i) {
auto pos = info->positions[i];
canvas->drawPoint(pos.fX + info->origin.fX, pos.fY + info->origin.fY, p2);
}
}
});
}
DrawResult onDraw(SkCanvas* canvas, SkString* errorMsg) override {
if (nullptr == fPara) {
return DrawResult::kSkip;
}
if (fFlags & kShowVisitor) {
canvas->clear(SK_ColorWHITE);
fPara->layout(400);
fPara->paint(canvas, 10, 10);
canvas->translate(400+10, 10);
this->drawFromVisitor(canvas, fPara.get());
return DrawResult::kOk;
}
const int loop = (this->getMode() == kGM_Mode) ? 1 : 50;
int parity = 0;
for (int i = 0; i < loop; ++i) {
SkAutoCanvasRestore acr(canvas, true);
if (fFlags & kTimeLayout) {
fPara->layout(400 + parity);
parity = (parity + 1) & 1;
}
fPara->paint(canvas, 10, 10);
}
// clean up if we've been looping
if (loop > 1) {
canvas->clear(SK_ColorWHITE);
fPara->layout(400);
fPara->paint(canvas, 10, 10);
}
if ((this->getMode() == kGM_Mode) && (fFlags & kTimeLayout)) {
return DrawResult::kSkip;
}
return DrawResult::kOk;
}
bool runAsBench() const override { return true; }
bool onAnimate(double /*nanos*/) override {
return false;
}
private:
using INHERITED = skiagm::GM;
};
DEF_GM(return new ParagraphGM(0);)
DEF_GM(return new ParagraphGM(kTimeLayout);)
DEF_GM(return new ParagraphGM(kUseUnderline);)
DEF_GM(return new ParagraphGM(kShowVisitor);)
DEF_GM(return new ParagraphGM(kShowVisitor | kUseUnderline);)