blob: 2f00d0d4851d600c5214e40502d6f242eebf94e7 [file] [log] [blame]
/*
* 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/SkFontStyle.h"
#include "include/core/SkFontTypes.h"
#include "include/core/SkMatrix.h"
#include "include/core/SkPaint.h"
#include "include/core/SkPoint.h"
#include "include/core/SkRect.h"
#include "include/core/SkScalar.h"
#include "include/core/SkString.h"
#include "include/core/SkTypeface.h"
#include "include/core/SkTypes.h"
#include "include/private/SkTemplates.h"
#include "include/private/base/SkTo.h"
#include "src/core/SkMatrixPriv.h"
#include "tools/ToolUtils.h"
#include <string.h>
class PerspTextGM : public skiagm::GM {
public:
PerspTextGM(bool minimal) : fMinimal(minimal) {
this->setBGColor(0xFFFFFFFF);
}
protected:
SkString onShortName() override {
return SkString(fMinimal ? "persptext_minimal" : "persptext");
}
SkISize onISize() override {
return SkISize::Make(1024, 768);
}
//#define TEST_PERSP_CHECK
void onDraw(SkCanvas* canvas) override {
canvas->clear(0xffffffff);
SkPaint paint;
paint.setAntiAlias(true);
SkFont font(ToolUtils::create_portable_typeface("serif", SkFontStyle()));
font.setSubpixel(true);
font.setSize(32);
font.setBaselineSnap(false);
const char* text = "Hamburgefons";
const size_t textLen = strlen(text);
SkScalar textWidth = font.measureText(text, textLen, SkTextEncoding::kUTF8,
nullptr, nullptr);
SkScalar textHeight = font.getMetrics(nullptr);
SkScalar x = 10, y = textHeight + 5.f;
const int kSteps = 8;
float kMinimalFactor = fMinimal ? 32.f : 1.f;
for (auto pm : {PerspMode::kX, PerspMode::kY, PerspMode::kXY}) {
for (int i = 0; i < kSteps; ++i) {
canvas->save();
#ifdef TEST_PERSP_CHECK
// draw non-perspective text in the background for comparison
paint.setColor(SK_ColorRED);
canvas->drawSimpleText(text, textLen, SkTextEncoding::kUTF8, x, y, font, paint);
#endif
SkMatrix persp = SkMatrix::I();
switch (pm) {
case PerspMode::kX:
if (fMinimal) {
persp.setPerspX(i*0.0005f/kSteps/kMinimalFactor);
} else {
persp.setPerspX(i*0.00025f/kSteps);
}
break;
case PerspMode::kY:
persp.setPerspY(i*0.0025f/kSteps/kMinimalFactor);
break;
case PerspMode::kXY:
persp.setPerspX(i*-0.00025f/kSteps/kMinimalFactor);
persp.setPerspY(i*-0.00125f/kSteps/kMinimalFactor);
break;
}
persp = SkMatrix::Concat(persp, SkMatrix::Translate(-x, -y));
persp = SkMatrix::Concat(SkMatrix::Translate(x, y), persp);
canvas->concat(persp);
paint.setColor(SK_ColorBLACK);
#ifdef TEST_PERSP_CHECK
// Draw text as red if it is nearly affine
SkRect bounds = SkRect::MakeXYWH(0, -textHeight, textWidth, textHeight);
bounds.offset(x, y);
if (SkMatrixPriv::NearlyAffine(persp, bounds, SK_Scalar1/(1 << 4))) {
paint.setColor(SK_ColorRED);
}
#endif
canvas->drawSimpleText(text, textLen, SkTextEncoding::kUTF8, x, y, font, paint);
y += textHeight + 5.f;
canvas->restore();
}
x += textWidth + 10.f;
y = textHeight + 5.f;
}
}
private:
enum class PerspMode { kX, kY, kXY };
bool fMinimal;
};
DEF_GM(return new PerspTextGM(true);)
DEF_GM(return new PerspTextGM(false);)