skia2/gm/fontscalerdistortable.cpp

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/*
* Copyright 2015 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/SkFont.h"
#include "include/core/SkFontArguments.h"
#include "include/core/SkFontMgr.h"
#include "include/core/SkFontTypes.h"
#include "include/core/SkPaint.h"
#include "include/core/SkRect.h"
#include "include/core/SkRefCnt.h"
#include "include/core/SkScalar.h"
#include "include/core/SkSize.h"
#include "include/core/SkStream.h"
#include "include/core/SkString.h"
#include "include/core/SkTypeface.h"
#include "include/core/SkTypes.h"
#include "tools/Resources.h"
#include "tools/SkMetaData.h"
#include <string.h>
#include <memory>
#include <utility>
namespace skiagm {
class FontScalerDistortableGM : public GM {
public:
FontScalerDistortableGM() {
this->setBGColor(0xFFFFFFFF);
}
private:
SkString onShortName() override {
return SkString("fontscalerdistortable");
}
SkISize onISize() override {
return SkISize::Make(550, 700);
}
bool fDirty = true;
bool fOverride = false;
size_t fAxisSliderCount = 0;
struct AxisSlider {
SkFourByteTag axis;
SkScalar control[3];
SkString name;
};
std::unique_ptr<AxisSlider[]> fAxisSliders;
bool onGetControls(SkMetaData* controls) override {
controls->setBool("Override", fOverride);
for (size_t i = 0; i < fAxisSliderCount; ++i) {
controls->setScalars(fAxisSliders[i].name.c_str(), 3, fAxisSliders[i].control);
}
return true;
}
void onSetControls(const SkMetaData& controls) override {
bool oldOverride = fOverride;
controls.findBool("Override", &fOverride);
if (fOverride != oldOverride) {
fDirty = true;
}
for (size_t i = 0; i < fAxisSliderCount; ++i) {
SkScalar oldValue = fAxisSliders[i].control[0];
controls.findScalars(fAxisSliders[i].name.c_str(), nullptr, fAxisSliders[i].control);
if (oldValue != fAxisSliders[i].control[0]) {
fDirty = true;
}
}
}
struct Info {
sk_sp<SkTypeface> distortable;
SkFourByteTag axisTag;
SkScalar axisMin;
SkScalar axisMax;
} fInfo;
void onOnceBeforeDraw() override {
constexpr SkFourByteTag wght = SkSetFourByteTag('w','g','h','t');
//constexpr SkFourByteTag wdth = SkSetFourByteTag('w','d','t','h');
fInfo = {
MakeResourceAsTypeface("fonts/Distortable.ttf"), wght, 0.5f, 2.0f
//SkTypeface::MakeFromFile("/Library/Fonts/Skia.ttf"), wght, 0.48f, 3.2f
//SkTypeface::MakeFromName("Skia", SkFontStyle()), wdth, 0.62f, 1.3f
//SkTypeface::MakeFromFile("/System/Library/Fonts/SFNS.ttf"), wght, 100.0f, 900.0f
//SkTypeface::MakeFromName(".SF NS", SkFontStyle()), wght, 100.0f, 900.0f
};
if (fInfo.distortable) {
int axisCount = fInfo.distortable->getVariationDesignParameters(nullptr, 0);
if (axisCount > 0) {
auto axes = std::make_unique<SkFontParameters::Variation::Axis[]>(axisCount);
axisCount = fInfo.distortable->getVariationDesignParameters(axes.get(), axisCount);
if (axisCount > 0) {
fAxisSliders = std::make_unique<AxisSlider[]>(axisCount);
for (int i = 0; i < axisCount; ++i) {
fAxisSliders[i].axis = axes[i].tag;
fAxisSliders[i].control[0] = axes[i].def;
fAxisSliders[i].control[1] = axes[i].min;
fAxisSliders[i].control[2] = axes[i].max;
fAxisSliders[i].name.append((const char *)&axes[i].tag, 4);
fAxisSliders[i].name.appendS32(i);
}
fAxisSliderCount = axisCount;
}
}
}
}
inline static constexpr int rows = 2;
inline static constexpr int cols = 5;
sk_sp<SkTypeface> typeface[rows][cols];
void updateTypefaces() {
sk_sp<SkFontMgr> fontMgr(SkFontMgr::RefDefault());
std::unique_ptr<SkStreamAsset> distortableStream( fInfo.distortable
? fInfo.distortable->openStream(nullptr)
: nullptr);
for (int row = 0; row < rows; ++row) {
for (int col = 0; col < cols; ++col) {
using Coordinate = SkFontArguments::VariationPosition::Coordinate;
int coordinateCount;
std::unique_ptr<Coordinate[]> coordinates;
if (fOverride) {
coordinateCount = fAxisSliderCount;
coordinates = std::make_unique<Coordinate[]>(coordinateCount);
for (size_t i = 0; i < fAxisSliderCount; ++i) {
coordinates[i].axis = fAxisSliders[i].axis;
coordinates[i].value = fAxisSliders[i].control[0];
}
} else {
coordinateCount = 2;
coordinates = std::make_unique<Coordinate[]>(coordinateCount);
SkScalar styleValue = SkScalarInterp(fInfo.axisMin, fInfo.axisMax,
SkScalar(row*cols + col) / (rows*cols));
coordinates[0] = {fInfo.axisTag, styleValue};
coordinates[1] = {fInfo.axisTag, styleValue};
}
SkFontArguments::VariationPosition position = {coordinates.get(), coordinateCount};
typeface[row][col] = [&]() -> sk_sp<SkTypeface> {
if (row == 0 && fInfo.distortable) {
return fInfo.distortable->makeClone(
SkFontArguments().setVariationDesignPosition(position));
}
if (distortableStream) {
return fontMgr->makeFromStream(distortableStream->duplicate(),
SkFontArguments().setVariationDesignPosition(position));
}
return nullptr;
}();
}
}
fDirty = false;
}
DrawResult onDraw(SkCanvas* canvas, SkString* errorMsg) override {
if (fDirty) {
this->updateTypefaces();
}
SkPaint paint;
paint.setAntiAlias(true);
SkFont font;
font.setEdging(SkFont::Edging::kSubpixelAntiAlias);
const char* text = "abc";
const size_t textLen = strlen(text);
for (int row = 0; row < rows; ++row) {
for (int col = 0; col < cols; ++col) {
SkScalar x = SkIntToScalar(10);
SkScalar y = SkIntToScalar(20);
font.setTypeface(typeface[row][col] ? typeface[row][col] : nullptr);
SkAutoCanvasRestore acr(canvas, true);
canvas->translate(SkIntToScalar(30 + col * 100), SkIntToScalar(20));
canvas->rotate(SkIntToScalar(col * 5), x, y * 10);
{
SkPaint p;
p.setAntiAlias(true);
SkRect r;
r.setLTRB(x - 3, 15, x - 1, 280);
canvas->drawRect(r, p);
}
for (int ps = 6; ps <= 22; ps++) {
font.setSize(SkIntToScalar(ps));
canvas->drawSimpleText(text, textLen, SkTextEncoding::kUTF8, x, y, font, paint);
y += font.getMetrics(nullptr);
}
}
canvas->translate(0, SkIntToScalar(360));
font.setSubpixel(true);
font.setLinearMetrics(true);
font.setBaselineSnap(false);
}
return DrawResult::kOk;
}
};
//////////////////////////////////////////////////////////////////////////////
DEF_GM( return new FontScalerDistortableGM; )
} // namespace skiagm