359 lines
12 KiB
C++
359 lines
12 KiB
C++
/*
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* Copyright 2015 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/SkBlendMode.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/SkColorFilter.h"
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#include "include/core/SkFont.h"
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#include "include/core/SkFontMgr.h"
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#include "include/core/SkFontTypes.h"
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#include "include/core/SkImage.h"
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#include "include/core/SkImageInfo.h"
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#include "include/core/SkPaint.h"
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#include "include/core/SkPath.h"
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#include "include/core/SkPathMeasure.h"
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#include "include/core/SkPoint.h"
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#include "include/core/SkRSXform.h"
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#include "include/core/SkRect.h"
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#include "include/core/SkRefCnt.h"
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#include "include/core/SkScalar.h"
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#include "include/core/SkShader.h"
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#include "include/core/SkSize.h"
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#include "include/core/SkString.h"
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#include "include/core/SkSurface.h"
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#include "include/core/SkTextBlob.h"
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#include "include/core/SkTileMode.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/core/SkVertices.h"
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#include "include/effects/SkGradientShader.h"
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#include "include/private/SkTemplates.h"
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#include "src/core/SkAutoMalloc.h"
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#include "src/core/SkFontPriv.h"
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#include "tools/Resources.h"
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#include "tools/ToolUtils.h"
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#include <initializer_list>
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class DrawAtlasGM : public skiagm::GM {
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static sk_sp<SkImage> MakeAtlas(SkCanvas* caller, const SkRect& target) {
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SkImageInfo info = SkImageInfo::MakeN32Premul(100, 100);
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auto surface(ToolUtils::makeSurface(caller, info));
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SkCanvas* canvas = surface->getCanvas();
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// draw red everywhere, but we don't expect to see it in the draw, testing the notion
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// that drawAtlas draws a subset-region of the atlas.
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canvas->clear(SK_ColorRED);
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SkPaint paint;
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paint.setBlendMode(SkBlendMode::kClear);
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SkRect r(target);
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r.inset(-1, -1);
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// zero out a place (with a 1-pixel border) to land our drawing.
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canvas->drawRect(r, paint);
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paint.setBlendMode(SkBlendMode::kSrcOver);
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paint.setColor(SK_ColorBLUE);
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paint.setAntiAlias(true);
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canvas->drawOval(target, paint);
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return surface->makeImageSnapshot();
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}
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public:
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DrawAtlasGM() {}
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protected:
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SkString onShortName() override {
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return SkString("draw-atlas");
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}
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SkISize onISize() override {
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return SkISize::Make(640, 480);
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}
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void onDraw(SkCanvas* canvas) override {
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const SkRect target = { 50, 50, 80, 90 };
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auto atlas = MakeAtlas(canvas, target);
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const struct {
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SkScalar fScale;
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SkScalar fDegrees;
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SkScalar fTx;
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SkScalar fTy;
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void apply(SkRSXform* xform) const {
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const SkScalar rad = SkDegreesToRadians(fDegrees);
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xform->fSCos = fScale * SkScalarCos(rad);
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xform->fSSin = fScale * SkScalarSin(rad);
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xform->fTx = fTx;
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xform->fTy = fTy;
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}
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} rec[] = {
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{ 1, 0, 10, 10 }, // just translate
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{ 2, 0, 110, 10 }, // scale + translate
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{ 1, 30, 210, 10 }, // rotate + translate
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{ 2, -30, 310, 30 }, // scale + rotate + translate
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};
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const int N = SK_ARRAY_COUNT(rec);
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SkRSXform xform[N];
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SkRect tex[N];
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SkColor colors[N];
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for (int i = 0; i < N; ++i) {
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rec[i].apply(&xform[i]);
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tex[i] = target;
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colors[i] = 0x80FF0000 + (i * 40 * 256);
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}
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SkPaint paint;
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paint.setAntiAlias(true);
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SkSamplingOptions sampling(SkFilterMode::kLinear);
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canvas->drawAtlas(atlas.get(), xform, tex, nullptr, N, SkBlendMode::kDst,
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sampling, nullptr, &paint);
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canvas->translate(0, 100);
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canvas->drawAtlas(atlas.get(), xform, tex, colors, N, SkBlendMode::kSrcIn,
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sampling, nullptr, &paint);
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}
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private:
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using INHERITED = GM;
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};
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DEF_GM( return new DrawAtlasGM; )
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///////////////////////////////////////////////////////////////////////////////////////////////////
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static void draw_text_on_path(SkCanvas* canvas, const void* text, size_t length,
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const SkPoint xy[], const SkPath& path, const SkFont& font, const SkPaint& paint,
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float baseline_offset) {
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SkPathMeasure meas(path, false);
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int count = font.countText(text, length, SkTextEncoding::kUTF8);
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size_t size = count * (sizeof(SkRSXform) + sizeof(SkScalar));
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SkAutoSMalloc<512> storage(size);
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SkRSXform* xform = (SkRSXform*)storage.get();
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SkScalar* widths = (SkScalar*)(xform + count);
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// Compute a conservative bounds so we can cull the draw
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const SkRect fontb = SkFontPriv::GetFontBounds(font);
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const SkScalar max = std::max(std::max(SkScalarAbs(fontb.fLeft), SkScalarAbs(fontb.fRight)),
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std::max(SkScalarAbs(fontb.fTop), SkScalarAbs(fontb.fBottom)));
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const SkRect bounds = path.getBounds().makeOutset(max, max);
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SkAutoTArray<SkGlyphID> glyphs(count);
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font.textToGlyphs(text, length, SkTextEncoding::kUTF8, glyphs.get(), count);
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font.getWidths(glyphs.get(), count, widths);
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for (int i = 0; i < count; ++i) {
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// we want to position each character on the center of its advance
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const SkScalar offset = SkScalarHalf(widths[i]);
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SkPoint pos;
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SkVector tan;
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if (!meas.getPosTan(xy[i].x() + offset, &pos, &tan)) {
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pos = xy[i];
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tan.set(1, 0);
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}
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pos += SkVector::Make(-tan.fY, tan.fX) * baseline_offset;
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xform[i].fSCos = tan.x();
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xform[i].fSSin = tan.y();
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xform[i].fTx = pos.x() - tan.y() * xy[i].y() - tan.x() * offset;
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xform[i].fTy = pos.y() + tan.x() * xy[i].y() - tan.y() * offset;
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}
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canvas->drawTextBlob(SkTextBlob::MakeFromRSXform(glyphs.get(), count * sizeof(SkGlyphID),
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&xform[0], font, SkTextEncoding::kGlyphID),
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0, 0, paint);
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if (true) {
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SkPaint p;
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p.setStyle(SkPaint::kStroke_Style);
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canvas->drawRect(bounds, p);
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}
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}
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static sk_sp<SkShader> make_shader() {
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SkPoint pts[2] = {{0, 0}, {220, 0}};
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SkColor colors[2] = {SK_ColorRED, SK_ColorBLUE};
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return SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkTileMode::kMirror);
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}
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static void drawTextPath(SkCanvas* canvas, bool doStroke) {
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const char text0[] = "ABCDFGHJKLMNOPQRSTUVWXYZ";
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const int N = sizeof(text0) - 1;
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SkPoint pos[N];
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SkFont font;
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font.setSize(100);
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SkPaint paint;
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paint.setShader(make_shader());
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paint.setAntiAlias(true);
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if (doStroke) {
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paint.setStyle(SkPaint::kStroke_Style);
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paint.setStrokeWidth(2.25f);
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paint.setStrokeJoin(SkPaint::kRound_Join);
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}
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SkScalar x = 0;
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for (int i = 0; i < N; ++i) {
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pos[i].set(x, 0);
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x += font.measureText(&text0[i], 1, SkTextEncoding::kUTF8, nullptr, &paint);
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}
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SkPath path;
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const float baseline_offset = -5;
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const SkPathDirection dirs[] = {
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SkPathDirection::kCW, SkPathDirection::kCCW,
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};
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for (auto d : dirs) {
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path.reset();
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path.addOval(SkRect::MakeXYWH(160, 160, 540, 540), d);
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draw_text_on_path(canvas, text0, N, pos, path, font, paint, baseline_offset);
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}
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paint.reset();
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paint.setStyle(SkPaint::kStroke_Style);
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canvas->drawPath(path, paint);
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}
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DEF_SIMPLE_GM(drawTextRSXform, canvas, 430, 860) {
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canvas->scale(0.5f, 0.5f);
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const bool doStroke[] = { false, true };
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for (auto st : doStroke) {
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drawTextPath(canvas, st);
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canvas->translate(0, 860);
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}
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}
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// Exercise xform blob and its bounds
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DEF_SIMPLE_GM(blob_rsxform, canvas, 500, 100) {
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SkFont font;
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font.setTypeface(ToolUtils::create_portable_typeface());
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font.setSize(50);
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const char text[] = "CrazyXform";
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constexpr size_t len = sizeof(text) - 1;
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SkRSXform xforms[len];
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SkScalar scale = 1;
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SkScalar x = 0, y = 0;
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for (size_t i = 0; i < len; ++i) {
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scale = SkScalarSin(i * SK_ScalarPI / (len-1)) * 0.75f + 0.5f;
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xforms[i] = SkRSXform::Make(scale, 0, x, y);
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x += 50 * scale;
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}
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auto blob = SkTextBlob::MakeFromRSXform(text, len, xforms, font);
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SkPoint offset = { 20, 70 };
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SkPaint paint;
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paint.setColor(0xFFCCCCCC);
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canvas->drawRect(blob->bounds().makeOffset(offset.fX, offset.fY), paint);
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paint.setColor(SK_ColorBLACK);
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canvas->drawTextBlob(blob, offset.fX, offset.fY, paint);
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}
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// Exercise xform blob and its tight bounds
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DEF_SIMPLE_GM(blob_rsxform_distortable, canvas, 500, 100) {
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sk_sp<SkTypeface> typeface;
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std::unique_ptr<SkStreamAsset> distortable(GetResourceAsStream("fonts/Distortable.ttf"));
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if (distortable) {
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sk_sp<SkFontMgr> fm = SkFontMgr::RefDefault();
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const SkFontArguments::VariationPosition::Coordinate position[] = {
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{ SkSetFourByteTag('w','g','h','t'), 1.618033988749895f }
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};
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SkFontArguments params;
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params.setVariationDesignPosition({position, SK_ARRAY_COUNT(position)});
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typeface = fm->makeFromStream(std::move(distortable), params);
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}
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SkFont font(typeface, 50);
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const char text[] = "abcabcabc";
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constexpr size_t len = sizeof(text) - 1;
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SkRSXform xforms[len];
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SkScalar scale = 1;
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SkScalar x = 0, y = 0;
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for (size_t i = 0; i < len; ++i) {
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scale = SkScalarSin(i * SK_ScalarPI / (len-1)) * 0.75f + 0.5f;
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xforms[i] = SkRSXform::Make(scale, 0, x, y);
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x += 50 * scale;
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}
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auto blob = SkTextBlob::MakeFromRSXform(text, len, xforms, font);
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SkPoint offset = { 20, 70 };
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SkPaint paint;
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paint.setColor(0xFFCCCCCC);
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canvas->drawRect(blob->bounds().makeOffset(offset.fX, offset.fY), paint);
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paint.setColor(SK_ColorBLACK);
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canvas->drawTextBlob(blob, offset.fX, offset.fY, paint);
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}
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static sk_sp<SkVertices> make_vertices(sk_sp<SkImage> image, const SkRect& r,
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SkColor color) {
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SkPoint pos[4];
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r.toQuad(pos);
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SkColor colors[4] = { color, color, color, color };
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return SkVertices::MakeCopy(SkVertices::kTriangleFan_VertexMode, 4,
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pos, pos, colors);
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}
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/*
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* drawAtlas and drawVertices have several things in common:
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* - can create compound "shaders", combining texture and colors
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* - these are combined via an explicit blendmode
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* - like drawImage, they only respect parts of the paint
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* - colorfilter, imagefilter, blendmode, alpha
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*
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* This GM produces a series of pairs of images (atlas | vertices).
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* Each pair should look the same, and each set shows a different combination
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* of alpha | colorFilter | mode
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*/
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DEF_SIMPLE_GM(compare_atlas_vertices, canvas, 560, 585) {
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const SkRect tex = SkRect::MakeWH(128, 128);
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const SkRSXform xform = SkRSXform::Make(1, 0, 0, 0);
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const SkColor color = 0x884488CC;
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auto image = GetResourceAsImage("images/mandrill_128.png");
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auto verts = make_vertices(image, tex, color);
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const sk_sp<SkColorFilter> filters[] = {
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nullptr,
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SkColorFilters::Blend(0xFF00FF88, SkBlendMode::kModulate),
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};
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const SkBlendMode modes[] = {
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SkBlendMode::kSrcOver,
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SkBlendMode::kPlus,
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};
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canvas->translate(10, 10);
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SkPaint paint;
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for (SkBlendMode mode : modes) {
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for (float alpha : { 1.0f, 0.5f }) {
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paint.setAlphaf(alpha);
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canvas->save();
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for (const sk_sp<SkColorFilter>& cf : filters) {
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paint.setColorFilter(cf);
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canvas->drawAtlas(image.get(), &xform, &tex, &color, 1, mode,
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SkSamplingOptions(), &tex, &paint);
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canvas->translate(128, 0);
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paint.setShader(image->makeShader(SkSamplingOptions()));
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canvas->drawVertices(verts, mode, paint);
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paint.setShader(nullptr);
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canvas->translate(145, 0);
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}
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canvas->restore();
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canvas->translate(0, 145);
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}
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}
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}
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