2a475eae62
Many tests and examples use drawText with a guess of how long the text is in bytes, or a call to strlen(). Add a helper to SkCanvas to simplify these examples. Add another helper for SkString. R=reed@google.com Change-Id: I0204a31e938f065606f08ee7cd9a6b36db791ee2 Reviewed-on: https://skia-review.googlesource.com/13642 Commit-Queue: Cary Clark <caryclark@google.com> Reviewed-by: Cary Clark <caryclark@google.com> Reviewed-by: Mike Reed <reed@google.com> Reviewed-by: Cary Clark <caryclark@skia.org>
395 lines
14 KiB
C++
395 lines
14 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.h"
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#include "sk_tool_utils.h"
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#include "SkCanvas.h"
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#include "SkPaint.h"
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#include "SkPath.h"
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#include "SkRandom.h"
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namespace skiagm {
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class DegenerateSegmentsGM : public GM {
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public:
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DegenerateSegmentsGM() {}
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protected:
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struct PathAndName {
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SkPath fPath;
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const char* fName1;
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const char* fName2;
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};
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SkString onShortName() {
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return SkString("degeneratesegments");
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}
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SkISize onISize() { return SkISize::Make(896, 930); }
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typedef SkPoint (*AddSegmentFunc)(SkPath&, SkPoint&);
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// We need to use explicit commands here, instead of addPath, because we
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// do not want the moveTo that is added at the beginning of a path to
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// appear in the appended path.
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static SkPoint AddMove(SkPath& path, SkPoint& startPt) {
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SkPoint moveToPt = startPt + SkPoint::Make(0, 10*SK_Scalar1);
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path.moveTo(moveToPt);
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return moveToPt;
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}
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static SkPoint AddMoveClose(SkPath& path, SkPoint& startPt) {
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SkPoint moveToPt = startPt + SkPoint::Make(0, 10*SK_Scalar1);
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path.moveTo(moveToPt);
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path.close();
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return moveToPt;
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}
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static SkPoint AddDegenLine(SkPath& path, SkPoint& startPt) {
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path.lineTo(startPt);
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return startPt;
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}
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static SkPoint AddMoveDegenLine(SkPath& path, SkPoint& startPt) {
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SkPoint moveToPt = startPt + SkPoint::Make(0, 10*SK_Scalar1);
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path.moveTo(moveToPt);
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path.lineTo(moveToPt);
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return moveToPt;
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}
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static SkPoint AddMoveDegenLineClose(SkPath& path, SkPoint& startPt) {
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SkPoint moveToPt = startPt + SkPoint::Make(0, 10*SK_Scalar1);
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path.moveTo(moveToPt);
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path.lineTo(moveToPt);
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path.close();
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return moveToPt;
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}
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static SkPoint AddDegenQuad(SkPath& path, SkPoint& startPt) {
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path.quadTo(startPt, startPt);
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return startPt;
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}
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static SkPoint AddMoveDegenQuad(SkPath& path, SkPoint& startPt) {
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SkPoint moveToPt = startPt + SkPoint::Make(0, 10*SK_Scalar1);
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path.moveTo(moveToPt);
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path.quadTo(moveToPt, moveToPt);
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return moveToPt;
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}
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static SkPoint AddMoveDegenQuadClose(SkPath& path, SkPoint& startPt) {
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SkPoint moveToPt = startPt + SkPoint::Make(0, 10*SK_Scalar1);
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path.moveTo(moveToPt);
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path.quadTo(moveToPt, moveToPt);
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path.close();
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return moveToPt;
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}
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static SkPoint AddDegenCubic(SkPath& path, SkPoint& startPt) {
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path.cubicTo(startPt, startPt, startPt);
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return startPt;
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}
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static SkPoint AddMoveDegenCubic(SkPath& path, SkPoint& startPt) {
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SkPoint moveToPt = startPt + SkPoint::Make(0, 10*SK_Scalar1);
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path.moveTo(moveToPt);
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path.cubicTo(moveToPt, moveToPt, moveToPt);
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return moveToPt;
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}
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static SkPoint AddMoveDegenCubicClose(SkPath& path, SkPoint& startPt) {
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SkPoint moveToPt = startPt + SkPoint::Make(0, 10*SK_Scalar1);
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path.moveTo(moveToPt);
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path.cubicTo(moveToPt, moveToPt, moveToPt);
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path.close();
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return moveToPt;
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}
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static SkPoint AddClose(SkPath& path, SkPoint& startPt) {
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path.close();
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return startPt;
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}
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static SkPoint AddLine(SkPath& path, SkPoint& startPt) {
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SkPoint endPt = startPt + SkPoint::Make(40*SK_Scalar1, 0);
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path.lineTo(endPt);
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return endPt;
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}
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static SkPoint AddMoveLine(SkPath& path, SkPoint& startPt) {
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SkPoint moveToPt = startPt + SkPoint::Make(0, 10*SK_Scalar1);
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SkPoint endPt = moveToPt + SkPoint::Make(40*SK_Scalar1, 0);
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path.moveTo(moveToPt);
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path.lineTo(endPt);
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return endPt;
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}
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static SkPoint AddMoveLineClose(SkPath& path, SkPoint& startPt) {
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SkPoint moveToPt = startPt + SkPoint::Make(0, 10*SK_Scalar1);
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SkPoint endPt = moveToPt + SkPoint::Make(40*SK_Scalar1, 0);
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path.moveTo(moveToPt);
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path.lineTo(endPt);
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path.close();
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return endPt;
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}
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static SkPoint AddQuad(SkPath& path, SkPoint& startPt) {
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SkPoint midPt = startPt + SkPoint::Make(20*SK_Scalar1, 5*SK_Scalar1);
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SkPoint endPt = startPt + SkPoint::Make(40*SK_Scalar1, 0);
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path.quadTo(midPt, endPt);
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return endPt;
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}
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static SkPoint AddMoveQuad(SkPath& path, SkPoint& startPt) {
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SkPoint moveToPt = startPt + SkPoint::Make(0, 10*SK_Scalar1);
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SkPoint midPt = moveToPt + SkPoint::Make(20*SK_Scalar1, 5*SK_Scalar1);
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SkPoint endPt = moveToPt + SkPoint::Make(40*SK_Scalar1, 0);
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path.moveTo(moveToPt);
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path.quadTo(midPt, endPt);
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return endPt;
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}
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static SkPoint AddMoveQuadClose(SkPath& path, SkPoint& startPt) {
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SkPoint moveToPt = startPt + SkPoint::Make(0, 10*SK_Scalar1);
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SkPoint midPt = moveToPt + SkPoint::Make(20*SK_Scalar1, 5*SK_Scalar1);
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SkPoint endPt = moveToPt + SkPoint::Make(40*SK_Scalar1, 0);
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path.moveTo(moveToPt);
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path.quadTo(midPt, endPt);
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path.close();
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return endPt;
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}
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static SkPoint AddCubic(SkPath& path, SkPoint& startPt) {
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SkPoint t1Pt = startPt + SkPoint::Make(15*SK_Scalar1, 5*SK_Scalar1);
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SkPoint t2Pt = startPt + SkPoint::Make(25*SK_Scalar1, 5*SK_Scalar1);
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SkPoint endPt = startPt + SkPoint::Make(40*SK_Scalar1, 0);
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path.cubicTo(t1Pt, t2Pt, endPt);
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return endPt;
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}
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static SkPoint AddMoveCubic(SkPath& path, SkPoint& startPt) {
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SkPoint moveToPt = startPt + SkPoint::Make(0, 10*SK_Scalar1);
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SkPoint t1Pt = moveToPt + SkPoint::Make(15*SK_Scalar1, 5*SK_Scalar1);
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SkPoint t2Pt = moveToPt + SkPoint::Make(25*SK_Scalar1, 5*SK_Scalar1);
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SkPoint endPt = moveToPt + SkPoint::Make(40*SK_Scalar1, 0);
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path.moveTo(moveToPt);
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path.cubicTo(t1Pt, t2Pt, endPt);
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return endPt;
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}
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static SkPoint AddMoveCubicClose(SkPath& path, SkPoint& startPt) {
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SkPoint moveToPt = startPt + SkPoint::Make(0, 10*SK_Scalar1);
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SkPoint t1Pt = moveToPt + SkPoint::Make(15*SK_Scalar1, 5*SK_Scalar1);
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SkPoint t2Pt = moveToPt + SkPoint::Make(25*SK_Scalar1, 5*SK_Scalar1);
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SkPoint endPt = moveToPt + SkPoint::Make(40*SK_Scalar1, 0);
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path.moveTo(moveToPt);
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path.cubicTo(t1Pt, t2Pt, endPt);
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path.close();
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return endPt;
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}
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void drawPath(SkPath& path, SkCanvas* canvas, SkColor color,
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const SkRect& clip, SkPaint::Cap cap, SkPaint::Join join,
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SkPaint::Style style, SkPath::FillType fill,
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SkScalar strokeWidth) {
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path.setFillType(fill);
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SkPaint paint;
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paint.setStrokeCap(cap);
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paint.setStrokeWidth(strokeWidth);
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paint.setStrokeJoin(join);
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paint.setColor(color);
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paint.setStyle(style);
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canvas->save();
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canvas->clipRect(clip);
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canvas->drawPath(path, paint);
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canvas->restore();
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}
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virtual void onDraw(SkCanvas* canvas) {
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constexpr AddSegmentFunc gSegmentFunctions[] = {
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AddMove,
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AddMoveClose,
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AddDegenLine,
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AddMoveDegenLine,
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AddMoveDegenLineClose,
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AddDegenQuad,
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AddMoveDegenQuad,
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AddMoveDegenQuadClose,
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AddDegenCubic,
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AddMoveDegenCubic,
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AddMoveDegenCubicClose,
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AddClose,
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AddLine,
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AddMoveLine,
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AddMoveLineClose,
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AddQuad,
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AddMoveQuad,
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AddMoveQuadClose,
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AddCubic,
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AddMoveCubic,
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AddMoveCubicClose
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};
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const char* gSegmentNames[] = {
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"Move",
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"MoveClose",
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"DegenLine",
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"MoveDegenLine",
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"MoveDegenLineClose",
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"DegenQuad",
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"MoveDegenQuad",
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"MoveDegenQuadClose",
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"DegenCubic",
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"MoveDegenCubic",
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"MoveDegenCubicClose",
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"Close",
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"Line",
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"MoveLine",
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"MoveLineClose",
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"Quad",
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"MoveQuad",
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"MoveQuadClose",
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"Cubic",
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"MoveCubic",
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"MoveCubicClose"
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};
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struct FillAndName {
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SkPath::FillType fFill;
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const char* fName;
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};
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constexpr FillAndName gFills[] = {
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{SkPath::kWinding_FillType, "Winding"},
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{SkPath::kEvenOdd_FillType, "Even / Odd"},
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{SkPath::kInverseWinding_FillType, "Inverse Winding"},
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{SkPath::kInverseEvenOdd_FillType, "Inverse Even / Odd"}
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};
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struct StyleAndName {
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SkPaint::Style fStyle;
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const char* fName;
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};
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constexpr StyleAndName gStyles[] = {
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{SkPaint::kFill_Style, "Fill"},
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{SkPaint::kStroke_Style, "Stroke 10"},
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{SkPaint::kStrokeAndFill_Style, "Stroke 10 And Fill"}
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};
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struct CapAndName {
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SkPaint::Cap fCap;
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SkPaint::Join fJoin;
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const char* fName;
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};
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constexpr CapAndName gCaps[] = {
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{SkPaint::kButt_Cap, SkPaint::kBevel_Join, "Butt"},
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{SkPaint::kRound_Cap, SkPaint::kRound_Join, "Round"},
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{SkPaint::kSquare_Cap, SkPaint::kBevel_Join, "Square"}
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};
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SkPaint titlePaint;
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titlePaint.setColor(SK_ColorBLACK);
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titlePaint.setAntiAlias(true);
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sk_tool_utils::set_portable_typeface(&titlePaint);
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titlePaint.setTextSize(15 * SK_Scalar1);
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const char title[] = "Random Paths Drawn Into Rectangle Clips With "
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"Indicated Style, Fill and Linecaps, "
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"with Stroke width 6";
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canvas->drawString(title,
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20 * SK_Scalar1,
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20 * SK_Scalar1,
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titlePaint);
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SkRandom rand;
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SkRect rect = SkRect::MakeWH(220*SK_Scalar1, 50*SK_Scalar1);
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canvas->save();
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canvas->translate(2*SK_Scalar1, 30 * SK_Scalar1); // The title
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canvas->save();
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unsigned numSegments = SK_ARRAY_COUNT(gSegmentFunctions);
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unsigned numCaps = SK_ARRAY_COUNT(gCaps);
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unsigned numStyles = SK_ARRAY_COUNT(gStyles);
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unsigned numFills = SK_ARRAY_COUNT(gFills);
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for (size_t row = 0; row < 6; ++row) {
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if (0 < row) {
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canvas->translate(0, rect.height() + 100*SK_Scalar1);
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}
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canvas->save();
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for (size_t column = 0; column < 4; ++column) {
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if (0 < column) {
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canvas->translate(rect.width() + 4*SK_Scalar1, 0);
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}
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SkColor color = sk_tool_utils::color_to_565(0xff007000);
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StyleAndName style = gStyles[(rand.nextU() >> 16) % numStyles];
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CapAndName cap = gCaps[(rand.nextU() >> 16) % numCaps];
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FillAndName fill = gFills[(rand.nextU() >> 16) % numFills];
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SkPath path;
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unsigned s1 = (rand.nextU() >> 16) % numSegments;
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unsigned s2 = (rand.nextU() >> 16) % numSegments;
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unsigned s3 = (rand.nextU() >> 16) % numSegments;
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unsigned s4 = (rand.nextU() >> 16) % numSegments;
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unsigned s5 = (rand.nextU() >> 16) % numSegments;
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SkPoint pt = SkPoint::Make(10*SK_Scalar1, 0);
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pt = gSegmentFunctions[s1](path, pt);
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pt = gSegmentFunctions[s2](path, pt);
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pt = gSegmentFunctions[s3](path, pt);
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pt = gSegmentFunctions[s4](path, pt);
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pt = gSegmentFunctions[s5](path, pt);
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this->drawPath(path, canvas, color, rect,
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cap.fCap, cap.fJoin, style.fStyle,
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fill.fFill, SK_Scalar1*6);
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SkPaint rectPaint;
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rectPaint.setColor(SK_ColorBLACK);
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rectPaint.setStyle(SkPaint::kStroke_Style);
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rectPaint.setStrokeWidth(-1);
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rectPaint.setAntiAlias(true);
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canvas->drawRect(rect, rectPaint);
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SkPaint labelPaint;
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labelPaint.setColor(color);
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labelPaint.setAntiAlias(true);
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sk_tool_utils::set_portable_typeface(&labelPaint);
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labelPaint.setTextSize(10 * SK_Scalar1);
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canvas->drawString(style.fName,
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0, rect.height() + 12 * SK_Scalar1,
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labelPaint);
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canvas->drawString(fill.fName,
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0, rect.height() + 24 * SK_Scalar1,
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labelPaint);
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canvas->drawString(cap.fName,
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0, rect.height() + 36 * SK_Scalar1,
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labelPaint);
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canvas->drawString(gSegmentNames[s1],
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0, rect.height() + 48 * SK_Scalar1,
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labelPaint);
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canvas->drawString(gSegmentNames[s2],
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0, rect.height() + 60 * SK_Scalar1,
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labelPaint);
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canvas->drawString(gSegmentNames[s3],
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0, rect.height() + 72 * SK_Scalar1,
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labelPaint);
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canvas->drawString(gSegmentNames[s4],
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0, rect.height() + 84 * SK_Scalar1,
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labelPaint);
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canvas->drawString(gSegmentNames[s5],
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0, rect.height() + 96 * SK_Scalar1,
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labelPaint);
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}
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canvas->restore();
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}
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canvas->restore();
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canvas->restore();
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}
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private:
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typedef GM INHERITED;
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};
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//////////////////////////////////////////////////////////////////////////////
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static GM* MyFactory(void*) { return new DegenerateSegmentsGM; }
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static GMRegistry reg(MyFactory);
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}
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