127 lines
4.0 KiB
C++
127 lines
4.0 KiB
C++
/*
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* Copyright 2011 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "gm/gm.h"
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#include "include/core/SkCanvas.h"
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#include "include/core/SkColor.h"
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#include "include/core/SkFont.h"
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#include "include/core/SkFontStyle.h"
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#include "include/core/SkFontTypes.h"
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#include "include/core/SkMatrix.h"
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#include "include/core/SkPaint.h"
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#include "include/core/SkPoint.h"
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#include "include/core/SkRect.h"
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#include "include/core/SkScalar.h"
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#include "include/core/SkString.h"
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#include "include/core/SkTypeface.h"
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#include "include/core/SkTypes.h"
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#include "include/private/base/SkTemplates.h"
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#include "include/private/base/SkTo.h"
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#include "src/core/SkMatrixPriv.h"
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#include "tools/ToolUtils.h"
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#include <string.h>
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class PerspTextGM : public skiagm::GM {
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public:
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PerspTextGM(bool minimal) : fMinimal(minimal) {
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this->setBGColor(0xFFFFFFFF);
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}
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protected:
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SkString onShortName() override {
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return SkString(fMinimal ? "persptext_minimal" : "persptext");
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}
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SkISize onISize() override {
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return SkISize::Make(1024, 768);
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}
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//#define TEST_PERSP_CHECK
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void onDraw(SkCanvas* canvas) override {
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canvas->clear(0xffffffff);
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SkPaint paint;
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paint.setAntiAlias(true);
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SkFont font(ToolUtils::create_portable_typeface("serif", SkFontStyle()));
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font.setSubpixel(true);
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font.setSize(32);
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font.setBaselineSnap(false);
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const char* text = "Hamburgefons";
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const size_t textLen = strlen(text);
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SkScalar textWidth = font.measureText(text, textLen, SkTextEncoding::kUTF8,
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nullptr, nullptr);
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SkScalar textHeight = font.getMetrics(nullptr);
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SkScalar x = 10, y = textHeight + 5.f;
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const int kSteps = 8;
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float kMinimalFactor = fMinimal ? 32.f : 1.f;
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for (auto pm : {PerspMode::kX, PerspMode::kY, PerspMode::kXY}) {
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for (int i = 0; i < kSteps; ++i) {
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canvas->save();
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#ifdef TEST_PERSP_CHECK
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// draw non-perspective text in the background for comparison
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paint.setColor(SK_ColorRED);
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canvas->drawSimpleText(text, textLen, SkTextEncoding::kUTF8, x, y, font, paint);
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#endif
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SkMatrix persp = SkMatrix::I();
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switch (pm) {
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case PerspMode::kX:
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if (fMinimal) {
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persp.setPerspX(i*0.0005f/kSteps/kMinimalFactor);
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} else {
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persp.setPerspX(i*0.00025f/kSteps);
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}
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break;
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case PerspMode::kY:
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persp.setPerspY(i*0.0025f/kSteps/kMinimalFactor);
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break;
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case PerspMode::kXY:
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persp.setPerspX(i*-0.00025f/kSteps/kMinimalFactor);
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persp.setPerspY(i*-0.00125f/kSteps/kMinimalFactor);
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break;
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}
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persp = SkMatrix::Concat(persp, SkMatrix::Translate(-x, -y));
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persp = SkMatrix::Concat(SkMatrix::Translate(x, y), persp);
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canvas->concat(persp);
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paint.setColor(SK_ColorBLACK);
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#ifdef TEST_PERSP_CHECK
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// Draw text as red if it is nearly affine
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SkRect bounds = SkRect::MakeXYWH(0, -textHeight, textWidth, textHeight);
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bounds.offset(x, y);
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if (SkMatrixPriv::NearlyAffine(persp, bounds, SK_Scalar1/(1 << 4))) {
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paint.setColor(SK_ColorRED);
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}
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#endif
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canvas->drawSimpleText(text, textLen, SkTextEncoding::kUTF8, x, y, font, paint);
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y += textHeight + 5.f;
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canvas->restore();
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}
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x += textWidth + 10.f;
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y = textHeight + 5.f;
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}
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}
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private:
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enum class PerspMode { kX, kY, kXY };
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bool fMinimal;
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};
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DEF_GM(return new PerspTextGM(true);)
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DEF_GM(return new PerspTextGM(false);)
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