| /* |
| * 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.h" |
| #include "Resources.h" |
| #include "SkTypeface.h" |
| |
| class SkJSCanvas { |
| public: |
| SkJSCanvas(SkCanvas* target); |
| ~SkJSCanvas(); |
| |
| void save(); |
| void restore(); |
| |
| double lineWidth; |
| void setLineWidth(double); |
| |
| void beginPath(); |
| void moveTo(double x, double y); |
| void lineTo(double x, double y); |
| void closePath(); |
| |
| void fill(); |
| void stroke(); |
| |
| void fillText(const char text[], double x, double y); |
| |
| private: |
| SkCanvas* fTarget; |
| SkPaint fFillPaint; |
| SkPaint fStrokePaint; |
| SkPath fPath; |
| }; |
| |
| SkJSCanvas::SkJSCanvas(SkCanvas* target) : fTarget(target) { |
| fFillPaint.setAntiAlias(true); |
| sk_tool_utils::set_portable_typeface(&fFillPaint); |
| fStrokePaint.setAntiAlias(true); |
| fStrokePaint.setStyle(SkPaint::kStroke_Style); |
| fStrokePaint.setStrokeWidth(SK_Scalar1); |
| } |
| |
| SkJSCanvas::~SkJSCanvas() {} |
| |
| void SkJSCanvas::save() { fTarget->save(); } |
| void SkJSCanvas::restore() { fTarget->restore(); } |
| |
| void SkJSCanvas::beginPath() { fPath.reset(); } |
| void SkJSCanvas::moveTo(double x, double y) { |
| fPath.moveTo(SkDoubleToScalar(x), SkDoubleToScalar(y)); |
| } |
| |
| void SkJSCanvas::lineTo(double x, double y) { |
| fPath.lineTo(SkDoubleToScalar(x), SkDoubleToScalar(y)); |
| } |
| |
| void SkJSCanvas::closePath() { fPath.close(); } |
| |
| void SkJSCanvas::fill() { |
| fTarget->drawPath(fPath, fFillPaint); |
| } |
| |
| void SkJSCanvas::stroke() { |
| fStrokePaint.setStrokeWidth(SkDoubleToScalar(lineWidth)); |
| fTarget->drawPath(fPath, fStrokePaint); |
| } |
| |
| void SkJSCanvas::fillText(const char text[], double x, double y) { |
| fTarget->drawText(text, strlen(text), |
| SkDoubleToScalar(x), SkDoubleToScalar(y), fFillPaint); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| static void dump(const SkPath& path) { |
| const SkRect& r = path.getBounds(); |
| SkDebugf("isEmpty %d, bounds [%g %g %g %g]\n", path.isEmpty(), |
| r.fLeft, r.fTop, r.fRight, r.fBottom); |
| } |
| |
| static void test_stroke(SkCanvas* canvas) { |
| if (true) { |
| SkPath path; |
| dump(path); |
| path.reset(); path.moveTo(0, 0); |
| dump(path); |
| path.reset(); path.moveTo(100, 100); |
| dump(path); |
| path.reset(); path.moveTo(0, 0); path.moveTo(100, 100); |
| dump(path); |
| path.reset(); path.moveTo(0, 0); path.lineTo(100, 100); |
| dump(path); |
| path.reset(); path.moveTo(0, 0); path.lineTo(100, 100); path.moveTo(200, 200); |
| dump(path); |
| } |
| |
| #if 0 |
| // TEST 1 - The rectangle as it's expected to look |
| var canvas = document.createElement('canvas'); |
| document.body.appendChild(canvas); |
| var ctx = canvas.getContext("2d"); |
| #else |
| SkJSCanvas ctx(canvas); |
| #endif |
| |
| ctx.save(); |
| ctx.lineWidth = 2; |
| ctx.beginPath(); |
| ctx.moveTo(10, 100); |
| ctx.lineTo(150, 100); |
| ctx.lineTo(150, 15); |
| ctx.lineTo(10, 15); |
| ctx.closePath(); |
| |
| // no extra moveTo here |
| // ctx.moveTo(175, 125); |
| |
| ctx.stroke(); |
| ctx.restore(); |
| |
| ctx.fillText("As Expected", 10, 10); |
| |
| #if 0 |
| // TEST 2 - Includes an extra moveTo call before stroke; the rectangle appears larger |
| canvas = document.createElement('canvas'); |
| document.body.appendChild(canvas); |
| ctx = canvas.getContext("2d"); |
| #else |
| canvas->translate(200, 0); |
| #endif |
| |
| ctx.save(); |
| ctx.lineWidth = 2; |
| ctx.beginPath(); |
| ctx.moveTo(10, 100); |
| ctx.lineTo(150, 100); |
| ctx.lineTo(150, 15); |
| ctx.lineTo(10, 15); |
| ctx.closePath(); |
| |
| ctx.moveTo(175, 125); |
| |
| ctx.stroke(); |
| ctx.restore(); |
| |
| ctx.fillText("Larger Rectangle", 10, 10); |
| |
| #if 0 |
| // TEST 3 - Identical to test 2 except the line width is 1 |
| canvas = document.createElement('canvas'); |
| document.body.appendChild(canvas); |
| ctx = canvas.getContext("2d"); |
| #else |
| canvas->translate(200, 0); |
| #endif |
| |
| ctx.save(); |
| ctx.lineWidth = 1; |
| ctx.beginPath(); |
| ctx.moveTo(10, 100); |
| ctx.lineTo(150, 100); |
| ctx.lineTo(150, 15); |
| ctx.lineTo(10, 15); |
| ctx.closePath(); |
| |
| ctx.moveTo(175, 125); |
| |
| ctx.stroke(); |
| ctx.restore(); |
| |
| ctx.fillText("As Expected - line width 1", 10, 10); |
| } |
| |
| class Poly2PolyGM : public skiagm::GM { |
| public: |
| Poly2PolyGM() {} |
| |
| protected: |
| |
| SkString onShortName() override { |
| return SkString("poly2poly"); |
| } |
| |
| SkISize onISize() override { |
| return SkISize::Make(835, 840); |
| } |
| |
| static void doDraw(SkCanvas* canvas, SkPaint* paint, const int isrc[], |
| const int idst[], int count) { |
| SkMatrix matrix; |
| SkPoint src[4], dst[4]; |
| |
| for (int i = 0; i < count; i++) { |
| src[i].set(SkIntToScalar(isrc[2*i+0]), SkIntToScalar(isrc[2*i+1])); |
| dst[i].set(SkIntToScalar(idst[2*i+0]), SkIntToScalar(idst[2*i+1])); |
| } |
| |
| canvas->save(); |
| matrix.setPolyToPoly(src, dst, count); |
| canvas->concat(matrix); |
| |
| paint->setColor(sk_tool_utils::color_to_565(SK_ColorGRAY)); |
| paint->setStyle(SkPaint::kStroke_Style); |
| const SkScalar D = SkIntToScalar(64); |
| canvas->drawRectCoords(0, 0, D, D, *paint); |
| canvas->drawLine(0, 0, D, D, *paint); |
| canvas->drawLine(0, D, D, 0, *paint); |
| |
| SkPaint::FontMetrics fm; |
| paint->getFontMetrics(&fm); |
| paint->setColor(SK_ColorRED); |
| paint->setStyle(SkPaint::kFill_Style); |
| SkScalar x = D/2; |
| SkScalar y = D/2 - (fm.fAscent + fm.fDescent)/2; |
| uint16_t glyphID = 3; // X |
| canvas->drawText((void*) &glyphID, sizeof(glyphID), x, y, *paint); |
| canvas->restore(); |
| } |
| |
| void onOnceBeforeDraw() override { |
| fEmFace.reset(GetResourceAsTypeface("/fonts/Em.ttf")); |
| } |
| |
| void onDraw(SkCanvas* canvas) override { |
| if (false) { test_stroke(canvas); return; } |
| |
| SkPaint paint; |
| paint.setAntiAlias(true); |
| paint.setTypeface(fEmFace); |
| paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding); |
| paint.setStrokeWidth(SkIntToScalar(4)); |
| paint.setTextSize(SkIntToScalar(40)); |
| paint.setTextAlign(SkPaint::kCenter_Align); |
| |
| canvas->save(); |
| canvas->translate(SkIntToScalar(10), SkIntToScalar(10)); |
| // translate (1 point) |
| const int src1[] = { 0, 0 }; |
| const int dst1[] = { 5, 5 }; |
| doDraw(canvas, &paint, src1, dst1, 1); |
| canvas->restore(); |
| |
| canvas->save(); |
| canvas->translate(SkIntToScalar(160), SkIntToScalar(10)); |
| // rotate/uniform-scale (2 points) |
| const int src2[] = { 32, 32, 64, 32 }; |
| const int dst2[] = { 32, 32, 64, 48 }; |
| doDraw(canvas, &paint, src2, dst2, 2); |
| canvas->restore(); |
| |
| canvas->save(); |
| canvas->translate(SkIntToScalar(10), SkIntToScalar(110)); |
| // rotate/skew (3 points) |
| const int src3[] = { 0, 0, 64, 0, 0, 64 }; |
| const int dst3[] = { 0, 0, 96, 0, 24, 64 }; |
| doDraw(canvas, &paint, src3, dst3, 3); |
| canvas->restore(); |
| |
| canvas->save(); |
| canvas->translate(SkIntToScalar(160), SkIntToScalar(110)); |
| // perspective (4 points) |
| const int src4[] = { 0, 0, 64, 0, 64, 64, 0, 64 }; |
| const int dst4[] = { 0, 0, 96, 0, 64, 96, 0, 64 }; |
| doDraw(canvas, &paint, src4, dst4, 4); |
| canvas->restore(); |
| } |
| |
| private: |
| typedef skiagm::GM INHERITED; |
| SkAutoTUnref<SkTypeface> fEmFace; |
| }; |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| |
| DEF_GM( return new Poly2PolyGM; ) |