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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 "SampleCode.h"
#include "Resources.h"
#include "SkAnimTimer.h"
#include "SkView.h"
#include "SkCanvas.h"
#include "SkRSXform.h"
#include "SkSurface.h"
#include "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 SampleView {
public:
DrawShipView(const char name[], DrawAtlasProc proc) : fName(name), fProc(proc) {
fAtlas = GetResourceAsImage("ship.png");
if (!fAtlas) {
SkDebugf("\nCould not decode file ship.png. Falling back to penguin mode.\n");
fAtlas = GetResourceAsImage("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);
fCurrentTime = 0;
fTimer.start();
}
~DrawShipView() override {}
protected:
// overrides from SkEventSink
bool onQuery(SkEvent* evt) override {
if (SampleCode::TitleQ(*evt)) {
SampleCode::TitleR(evt, fName);
return true;
}
return this->INHERITED::onQuery(evt);
}
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);
paint.setTextSize(15.0f);
fTimer.end();
fTimes[fCurrentTime] = (float)(fTimer.fWall);
fCurrentTime = (fCurrentTime + 1) & 0x1f;
float meanTime = 0.0f;
for (int i = 0; i < 32; ++i) {
meanTime += fTimes[i];
}
meanTime /= 32.f;
SkString outString("fps: ");
SkScalar fps = 1000.f/meanTime;
outString.appendScalar(fps);
outString.append(" ms: ");
outString.appendScalar(meanTime);
fTimer.start();
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);
paint.setColor(SK_ColorBLACK);
canvas->drawRect(SkRect::MakeXYWH(0, 0, 200, 24), paint);
paint.setColor(SK_ColorWHITE);
canvas->drawString(outString, 5, 15, paint);
this->inval(nullptr);
}
#if 0
// TODO: switch over to use this for our animation
bool onAnimate(const SkAnimTimer& timer) override {
SkScalar angle = SkDoubleToScalar(fmod(timer.secs() * 360 / 24, 360));
fAnimatingDrawable->setSweep(angle);
return true;
}
#endif
private:
const char* fName;
DrawAtlasProc fProc;
sk_sp<SkImage> fAtlas;
SkRSXform fXform[kGrid*kGrid+1];
SkRect fTex[kGrid*kGrid+1];
WallTimer fTimer;
float fTimes[32];
int fCurrentTime;
typedef SampleView INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
DEF_SAMPLE( return new DrawShipView("DrawShip", draw_atlas); )
DEF_SAMPLE( return new DrawShipView("DrawShipSim", draw_atlas_sim); )
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