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284 lines
7.5 KiB
284 lines
7.5 KiB
/*
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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.h"
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#include "sk_tool_utils.h"
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#include "Resources.h"
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#include "SkFontMetrics.h"
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#include "SkPath.h"
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#include "SkTextUtils.h"
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#include "SkTypeface.h"
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class SkJSCanvas {
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public:
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SkJSCanvas(SkCanvas* target);
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~SkJSCanvas();
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void save();
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void restore();
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double lineWidth;
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void setLineWidth(double);
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void beginPath();
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void moveTo(double x, double y);
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void lineTo(double x, double y);
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void closePath();
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void fill();
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void stroke();
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void fillText(const char text[], double x, double y);
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private:
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SkCanvas* fTarget;
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SkPaint fFillPaint;
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SkPaint fStrokePaint;
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SkPath fPath;
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SkFont fFont;
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};
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SkJSCanvas::SkJSCanvas(SkCanvas* target)
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: fTarget(target)
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, fFont(sk_tool_utils::create_portable_typeface(), 12) {
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fFillPaint.setAntiAlias(true);
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fStrokePaint.setAntiAlias(true);
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fStrokePaint.setStyle(SkPaint::kStroke_Style);
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fStrokePaint.setStrokeWidth(SK_Scalar1);
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}
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SkJSCanvas::~SkJSCanvas() {}
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void SkJSCanvas::save() { fTarget->save(); }
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void SkJSCanvas::restore() { fTarget->restore(); }
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void SkJSCanvas::beginPath() { fPath.reset(); }
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void SkJSCanvas::moveTo(double x, double y) {
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fPath.moveTo(SkDoubleToScalar(x), SkDoubleToScalar(y));
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}
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void SkJSCanvas::lineTo(double x, double y) {
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fPath.lineTo(SkDoubleToScalar(x), SkDoubleToScalar(y));
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}
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void SkJSCanvas::closePath() { fPath.close(); }
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void SkJSCanvas::fill() {
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fTarget->drawPath(fPath, fFillPaint);
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}
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void SkJSCanvas::stroke() {
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fStrokePaint.setStrokeWidth(SkDoubleToScalar(lineWidth));
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fTarget->drawPath(fPath, fStrokePaint);
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}
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void SkJSCanvas::fillText(const char text[], double x, double y) {
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fTarget->drawString(text, SkDoubleToScalar(x), SkDoubleToScalar(y), fFont, fFillPaint);
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}
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///////////////////////////////////////////////////////////////////////////////
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static void dump(const SkPath& path) {
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const SkRect& r = path.getBounds();
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SkDebugf("isEmpty %d, bounds [%g %g %g %g]\n", path.isEmpty(),
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r.fLeft, r.fTop, r.fRight, r.fBottom);
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}
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static void test_stroke(SkCanvas* canvas) {
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if (true) {
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SkPath path;
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dump(path);
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path.reset(); path.moveTo(0, 0);
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dump(path);
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path.reset(); path.moveTo(100, 100);
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dump(path);
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path.reset(); path.moveTo(0, 0); path.moveTo(100, 100);
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dump(path);
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path.reset(); path.moveTo(0, 0); path.lineTo(100, 100);
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dump(path);
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path.reset(); path.moveTo(0, 0); path.lineTo(100, 100); path.moveTo(200, 200);
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dump(path);
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}
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#if 0
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// TEST 1 - The rectangle as it's expected to look
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var canvas = document.createElement('canvas');
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document.body.appendChild(canvas);
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var ctx = canvas.getContext("2d");
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#else
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SkJSCanvas ctx(canvas);
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#endif
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ctx.save();
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ctx.lineWidth = 2;
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ctx.beginPath();
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ctx.moveTo(10, 100);
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ctx.lineTo(150, 100);
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ctx.lineTo(150, 15);
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ctx.lineTo(10, 15);
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ctx.closePath();
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// no extra moveTo here
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// ctx.moveTo(175, 125);
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ctx.stroke();
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ctx.restore();
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ctx.fillText("As Expected", 10, 10);
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#if 0
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// TEST 2 - Includes an extra moveTo call before stroke; the rectangle appears larger
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canvas = document.createElement('canvas');
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document.body.appendChild(canvas);
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ctx = canvas.getContext("2d");
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#else
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canvas->translate(200, 0);
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#endif
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ctx.save();
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ctx.lineWidth = 2;
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ctx.beginPath();
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ctx.moveTo(10, 100);
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ctx.lineTo(150, 100);
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ctx.lineTo(150, 15);
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ctx.lineTo(10, 15);
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ctx.closePath();
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ctx.moveTo(175, 125);
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ctx.stroke();
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ctx.restore();
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ctx.fillText("Larger Rectangle", 10, 10);
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#if 0
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// TEST 3 - Identical to test 2 except the line width is 1
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canvas = document.createElement('canvas');
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document.body.appendChild(canvas);
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ctx = canvas.getContext("2d");
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#else
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canvas->translate(200, 0);
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#endif
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ctx.save();
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ctx.lineWidth = 1;
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ctx.beginPath();
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ctx.moveTo(10, 100);
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ctx.lineTo(150, 100);
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ctx.lineTo(150, 15);
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ctx.lineTo(10, 15);
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ctx.closePath();
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ctx.moveTo(175, 125);
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ctx.stroke();
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ctx.restore();
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ctx.fillText("As Expected - line width 1", 10, 10);
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}
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class Poly2PolyGM : public skiagm::GM {
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public:
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Poly2PolyGM() {}
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protected:
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SkString onShortName() override {
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return SkString("poly2poly");
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}
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SkISize onISize() override {
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return SkISize::Make(835, 840);
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}
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static void doDraw(SkCanvas* canvas, const SkFont& font, SkPaint* paint, const int isrc[],
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const int idst[], int count) {
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SkMatrix matrix;
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SkPoint src[4], dst[4];
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for (int i = 0; i < count; i++) {
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src[i].set(SkIntToScalar(isrc[2*i+0]), SkIntToScalar(isrc[2*i+1]));
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dst[i].set(SkIntToScalar(idst[2*i+0]), SkIntToScalar(idst[2*i+1]));
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}
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canvas->save();
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matrix.setPolyToPoly(src, dst, count);
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canvas->concat(matrix);
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paint->setColor(SK_ColorGRAY);
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paint->setStyle(SkPaint::kStroke_Style);
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const SkScalar D = 64;
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canvas->drawRect(SkRect::MakeWH(D, D), *paint);
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canvas->drawLine(0, 0, D, D, *paint);
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canvas->drawLine(0, D, D, 0, *paint);
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SkFontMetrics fm;
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font.getMetrics(&fm);
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paint->setColor(SK_ColorRED);
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paint->setStyle(SkPaint::kFill_Style);
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SkScalar x = D/2;
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SkScalar y = D/2 - (fm.fAscent + fm.fDescent)/2;
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uint16_t glyphID = 3; // X
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SkTextUtils::Draw(canvas, &glyphID, sizeof(glyphID), kGlyphID_SkTextEncoding, x, y,
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font, *paint, SkTextUtils::kCenter_Align);
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canvas->restore();
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}
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void onOnceBeforeDraw() override {
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fEmFace = MakeResourceAsTypeface("fonts/Em.ttf");
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}
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void onDraw(SkCanvas* canvas) override {
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if (false) { test_stroke(canvas); return; }
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SkPaint paint;
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paint.setAntiAlias(true);
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paint.setStrokeWidth(SkIntToScalar(4));
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SkFont font(fEmFace, 40);
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canvas->save();
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canvas->translate(SkIntToScalar(10), SkIntToScalar(10));
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// translate (1 point)
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const int src1[] = { 0, 0 };
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const int dst1[] = { 5, 5 };
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doDraw(canvas, font, &paint, src1, dst1, 1);
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canvas->restore();
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canvas->save();
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canvas->translate(SkIntToScalar(160), SkIntToScalar(10));
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// rotate/uniform-scale (2 points)
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const int src2[] = { 32, 32, 64, 32 };
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const int dst2[] = { 32, 32, 64, 48 };
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doDraw(canvas, font, &paint, src2, dst2, 2);
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canvas->restore();
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canvas->save();
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canvas->translate(SkIntToScalar(10), SkIntToScalar(110));
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// rotate/skew (3 points)
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const int src3[] = { 0, 0, 64, 0, 0, 64 };
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const int dst3[] = { 0, 0, 96, 0, 24, 64 };
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doDraw(canvas, font, &paint, src3, dst3, 3);
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canvas->restore();
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canvas->save();
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canvas->translate(SkIntToScalar(160), SkIntToScalar(110));
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// perspective (4 points)
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const int src4[] = { 0, 0, 64, 0, 64, 64, 0, 64 };
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const int dst4[] = { 0, 0, 96, 0, 64, 96, 0, 64 };
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doDraw(canvas, font, &paint, src4, dst4, 4);
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canvas->restore();
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}
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private:
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typedef skiagm::GM INHERITED;
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sk_sp<SkTypeface> fEmFace;
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};
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//////////////////////////////////////////////////////////////////////////////
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DEF_GM( return new Poly2PolyGM; )
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