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- /*
- * Copyright 2015 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
- #include "include/core/SkCanvas.h"
- #include "include/core/SkFont.h"
- #include "include/core/SkRSXform.h"
- #include "include/core/SkSurface.h"
- #include "samplecode/Sample.h"
- #include "tools/Resources.h"
- #include "tools/timer/Timer.h"
- #include <stdio.h>
- static const int kGrid = 100;
- static const int kWidth = 960;
- static const int kHeight = 640;
- typedef void (*DrawAtlasProc)(SkCanvas*, SkImage*, const SkRSXform[], const SkRect[],
- const SkColor[], int, const SkRect*, const SkPaint*);
- static void draw_atlas(SkCanvas* canvas, SkImage* atlas, const SkRSXform xform[],
- const SkRect tex[], const SkColor colors[], int count, const SkRect* cull,
- const SkPaint* paint) {
- canvas->drawAtlas(atlas, xform, tex, colors, count, SkBlendMode::kModulate, cull, paint);
- }
- static void draw_atlas_sim(SkCanvas* canvas, SkImage* atlas, const SkRSXform xform[],
- const SkRect tex[], const SkColor colors[], int count, const SkRect* cull,
- const SkPaint* paint) {
- for (int i = 0; i < count; ++i) {
- SkMatrix matrix;
- matrix.setRSXform(xform[i]);
- canvas->save();
- canvas->concat(matrix);
- canvas->drawImageRect(atlas, tex[i], tex[i].makeOffset(-tex[i].x(), -tex[i].y()), paint,
- SkCanvas::kFast_SrcRectConstraint);
- canvas->restore();
- }
- }
- class DrawShipView : public Sample {
- public:
- DrawShipView(const char name[], DrawAtlasProc proc) : fName(name), fProc(proc) {
- fAtlas = GetResourceAsImage("images/ship.png");
- if (!fAtlas) {
- SkDebugf("\nCould not decode file ship.png. Falling back to penguin mode.\n");
- fAtlas = GetResourceAsImage("images/baby_tux.png");
- if (!fAtlas) {
- SkDebugf("\nCould not decode file baby_tux.png. Did you forget"
- " to set the resourcePath?\n");
- return;
- }
- }
- SkScalar anchorX = fAtlas->width()*0.5f;
- SkScalar anchorY = fAtlas->height()*0.5f;
- int currIndex = 0;
- for (int x = 0; x < kGrid; x++) {
- for (int y = 0; y < kGrid; y++) {
- float xPos = (x / (kGrid - 1.0f)) * kWidth;
- float yPos = (y / (kGrid - 1.0f)) * kWidth;
- fTex[currIndex] = SkRect::MakeLTRB(0.0f, 0.0f,
- SkIntToScalar(fAtlas->width()),
- SkIntToScalar(fAtlas->height()));
- fXform[currIndex] = SkRSXform::MakeFromRadians(0.1f, SK_ScalarPI*0.5f,
- xPos, yPos, anchorX, anchorY);
- currIndex++;
- }
- }
- fTex[currIndex] = SkRect::MakeLTRB(0.0f, 0.0f,
- SkIntToScalar(fAtlas->width()),
- SkIntToScalar(fAtlas->height()));
- fXform[currIndex] = SkRSXform::MakeFromRadians(0.5f, SK_ScalarPI*0.5f,
- kWidth*0.5f, kHeight*0.5f, anchorX, anchorY);
- }
- ~DrawShipView() override {}
- protected:
- SkString name() override { return SkString(fName); }
- void onDrawContent(SkCanvas* canvas) override {
- const float kCosDiff = 0.99984769515f;
- const float kSinDiff = 0.01745240643f;
- if (!fAtlas) {
- return;
- }
- SkPaint paint;
- paint.setFilterQuality(kLow_SkFilterQuality);
- paint.setColor(SK_ColorWHITE);
- SkScalar anchorX = fAtlas->width()*0.5f;
- SkScalar anchorY = fAtlas->height()*0.5f;
- for (int i = 0; i < kGrid*kGrid+1; ++i) {
- SkScalar c = fXform[i].fSCos;
- SkScalar s = fXform[i].fSSin;
- SkScalar dx = c*anchorX - s*anchorY;
- SkScalar dy = s*anchorX + c*anchorY;
- fXform[i].fSCos = kCosDiff*c - kSinDiff*s;
- fXform[i].fSSin = kSinDiff*c + kCosDiff*s;
- dx -= fXform[i].fSCos*anchorX - fXform[i].fSSin*anchorY;
- dy -= fXform[i].fSSin*anchorX + fXform[i].fSCos*anchorY;
- fXform[i].fTx += dx;
- fXform[i].fTy += dy;
- }
- fProc(canvas, fAtlas.get(), fXform, fTex, nullptr, kGrid*kGrid+1, nullptr, &paint);
- }
- bool onAnimate(double nanos) override {
- //TODO: use nanos
- //SkScalar angle = SkDoubleToScalar(fmod(1e-9 * nanos * 360 / 24, 360));
- //fAnimatingDrawable->setSweep(angle);
- return true;
- }
- private:
- const char* fName;
- DrawAtlasProc fProc;
- sk_sp<SkImage> fAtlas;
- SkRSXform fXform[kGrid*kGrid+1];
- SkRect fTex[kGrid*kGrid+1];
- typedef Sample INHERITED;
- };
- //////////////////////////////////////////////////////////////////////////////
- DEF_SAMPLE( return new DrawShipView("DrawShip", draw_atlas); )
- DEF_SAMPLE( return new DrawShipView("DrawShipSim", draw_atlas_sim); )
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