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skia2/gm/drawbitmaprect.cpp
mtklein dbfd7ab108 Replace a lot of 'static const' with 'constexpr' or 'const'. 
'static const' means, there must be at most one of these, and initialize it at
compile time if possible or runtime if necessary.  This leads to unexpected
code execution, and TSAN* will complain about races on the guard variables.

Generally 'constexpr' or 'const' are better choices.  Neither can cause races:
they're either intialized at compile time (constexpr) or intialized each time
independently (const).

This CL prefers constexpr where possible, and uses const where not.  It even
prefers constexpr over const where they don't make a difference... I want to have
lots of examples of constexpr for people to see and mimic.

The scoped-to-class static has nothing to do with any of this, and is not changed.

* Not yet on the bots, which use an older TSAN.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2300623005

Review-Url: https://codereview.chromium.org/2300623005
2016-09-01 11:24:54 -07:00

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/*
* 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 "SkBlurMask.h"
#include "SkBlurMaskFilter.h"
#include "SkColorPriv.h"
#include "SkGradientShader.h"
#include "SkImage.h"
#include "SkImage_Base.h"
#include "SkMathPriv.h"
#include "SkShader.h"
#include "SkSurface.h"
static SkBitmap make_chessbm(int w, int h) {
SkBitmap bm;
bm.allocN32Pixels(w, h);
for (int y = 0; y < bm.height(); y++) {
uint32_t* p = bm.getAddr32(0, y);
for (int x = 0; x < bm.width(); x++) {
p[x] = ((x + y) & 1) ? SK_ColorWHITE : SK_ColorBLACK;
}
}
bm.unlockPixels();
return bm;
}
// Creates a bitmap and a matching image.
static sk_sp<SkImage> makebm(SkCanvas* origCanvas, SkBitmap* resultBM, int w, int h) {
SkImageInfo info = SkImageInfo::MakeN32Premul(w, h);
auto surface(origCanvas->makeSurface(info));
if (nullptr == surface) {
// picture canvas will return null, so fall-back to raster
surface = SkSurface::MakeRaster(info);
}
SkCanvas* canvas = surface->getCanvas();
canvas->clear(SK_ColorTRANSPARENT);
SkScalar wScalar = SkIntToScalar(w);
SkScalar hScalar = SkIntToScalar(h);
SkPoint pt = { wScalar / 2, hScalar / 2 };
SkScalar radius = 4 * SkMaxScalar(wScalar, hScalar);
SkColor colors[] = { SK_ColorRED, SK_ColorYELLOW,
SK_ColorGREEN, SK_ColorMAGENTA,
SK_ColorBLUE, SK_ColorCYAN,
SK_ColorRED};
SkScalar pos[] = {0,
SK_Scalar1 / 6,
2 * SK_Scalar1 / 6,
3 * SK_Scalar1 / 6,
4 * SK_Scalar1 / 6,
5 * SK_Scalar1 / 6,
SK_Scalar1};
SkPaint paint;
SkRect rect = SkRect::MakeWH(wScalar, hScalar);
SkMatrix mat = SkMatrix::I();
for (int i = 0; i < 4; ++i) {
paint.setShader(SkGradientShader::MakeRadial(
pt, radius,
colors, pos,
SK_ARRAY_COUNT(colors),
SkShader::kRepeat_TileMode,
0, &mat));
canvas->drawRect(rect, paint);
rect.inset(wScalar / 8, hScalar / 8);
mat.postScale(SK_Scalar1 / 4, SK_Scalar1 / 4);
}
auto image = surface->makeImageSnapshot();
SkBitmap tempBM;
image->asLegacyBitmap(&tempBM, SkImage::kRO_LegacyBitmapMode);
// Let backends know we won't change this, so they don't have to deep copy it defensively.
tempBM.setImmutable();
*resultBM = tempBM;
return image;
}
static void bitmapproc(SkCanvas* canvas, SkImage*, const SkBitmap& bm, const SkIRect& srcR,
const SkRect& dstR, const SkPaint* paint) {
canvas->drawBitmapRect(bm, srcR, dstR, paint);
}
static void bitmapsubsetproc(SkCanvas* canvas, SkImage*, const SkBitmap& bm, const SkIRect& srcR,
const SkRect& dstR, const SkPaint* paint) {
if (!bm.bounds().contains(srcR)) {
bitmapproc(canvas, nullptr, bm, srcR, dstR, paint);
return;
}
SkBitmap subset;
if (bm.extractSubset(&subset, srcR)) {
canvas->drawBitmapRect(subset, dstR, paint);
}
}
static void imageproc(SkCanvas* canvas, SkImage* image, const SkBitmap&, const SkIRect& srcR,
const SkRect& dstR, const SkPaint* paint) {
canvas->drawImageRect(image, srcR, dstR, paint);
}
static void imagesubsetproc(SkCanvas* canvas, SkImage* image, const SkBitmap& bm,
const SkIRect& srcR, const SkRect& dstR, const SkPaint* paint) {
if (!image->bounds().contains(srcR)) {
imageproc(canvas, image, bm, srcR, dstR, paint);
return;
}
if (sk_sp<SkImage> subset = image->makeSubset(srcR)) {
canvas->drawImageRect(subset, dstR, paint);
}
}
typedef void DrawRectRectProc(SkCanvas*, SkImage*, const SkBitmap&, const SkIRect&, const SkRect&,
const SkPaint*);
constexpr int gSize = 1024;
constexpr int gBmpSize = 2048;
class DrawBitmapRectGM : public skiagm::GM {
public:
DrawBitmapRectGM(DrawRectRectProc proc, const char suffix[]) : fProc(proc) {
fName.set("drawbitmaprect");
if (suffix) {
fName.append(suffix);
}
}
DrawRectRectProc* fProc;
SkBitmap fLargeBitmap;
sk_sp<SkImage> fImage;
SkString fName;
protected:
SkString onShortName() override { return fName; }
SkISize onISize() override { return SkISize::Make(gSize, gSize); }
void setupImage(SkCanvas* canvas) {
fImage = makebm(canvas, &fLargeBitmap, gBmpSize, gBmpSize);
}
void onDraw(SkCanvas* canvas) override {
if (!fImage) {
this->setupImage(canvas);
}
SkRect dstRect = { 0, 0, SkIntToScalar(64), SkIntToScalar(64)};
const int kMaxSrcRectSize = 1 << (SkNextLog2(gBmpSize) + 2);
const int kPadX = 30;
const int kPadY = 40;
SkPaint paint;
paint.setAlpha(0x20);
canvas->drawImageRect(fImage, SkRect::MakeIWH(gSize, gSize), &paint);
canvas->translate(SK_Scalar1 * kPadX / 2,
SK_Scalar1 * kPadY / 2);
SkPaint blackPaint;
SkScalar titleHeight = SK_Scalar1 * 24;
blackPaint.setColor(SK_ColorBLACK);
blackPaint.setTextSize(titleHeight);
blackPaint.setAntiAlias(true);
sk_tool_utils::set_portable_typeface(&blackPaint);
SkString title;
title.printf("Bitmap size: %d x %d", gBmpSize, gBmpSize);
canvas->drawText(title.c_str(), title.size(), 0,
titleHeight, blackPaint);
canvas->translate(0, SK_Scalar1 * kPadY / 2 + titleHeight);
int rowCount = 0;
canvas->save();
for (int w = 1; w <= kMaxSrcRectSize; w *= 4) {
for (int h = 1; h <= kMaxSrcRectSize; h *= 4) {
SkIRect srcRect = SkIRect::MakeXYWH((gBmpSize - w) / 2, (gBmpSize - h) / 2, w, h);
fProc(canvas, fImage.get(), fLargeBitmap, srcRect, dstRect, nullptr);
SkString label;
label.appendf("%d x %d", w, h);
blackPaint.setAntiAlias(true);
blackPaint.setStyle(SkPaint::kFill_Style);
blackPaint.setTextSize(SK_Scalar1 * 10);
SkScalar baseline = dstRect.height() +
blackPaint.getTextSize() + SK_Scalar1 * 3;
canvas->drawText(label.c_str(), label.size(),
0, baseline,
blackPaint);
blackPaint.setStyle(SkPaint::kStroke_Style);
blackPaint.setStrokeWidth(SK_Scalar1);
blackPaint.setAntiAlias(false);
canvas->drawRect(dstRect, blackPaint);
canvas->translate(dstRect.width() + SK_Scalar1 * kPadX, 0);
++rowCount;
if ((dstRect.width() + kPadX) * rowCount > gSize) {
canvas->restore();
canvas->translate(0, dstRect.height() + SK_Scalar1 * kPadY);
canvas->save();
rowCount = 0;
}
}
}
{
// test the following code path:
// SkGpuDevice::drawPath() -> SkGpuDevice::drawWithMaskFilter()
SkIRect srcRect;
SkPaint paint;
SkBitmap bm;
bm = make_chessbm(5, 5);
paint.setFilterQuality(kLow_SkFilterQuality);
srcRect.setXYWH(1, 1, 3, 3);
paint.setMaskFilter(SkBlurMaskFilter::Make(
kNormal_SkBlurStyle,
SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(5)),
SkBlurMaskFilter::kHighQuality_BlurFlag));
sk_sp<SkImage> image(SkImage::MakeFromBitmap(bm));
fProc(canvas, image.get(), bm, srcRect, dstRect, &paint);
}
}
private:
typedef skiagm::GM INHERITED;
};
DEF_GM( return new DrawBitmapRectGM(bitmapproc , nullptr); )
DEF_GM( return new DrawBitmapRectGM(bitmapsubsetproc, "-subset"); )
DEF_GM( return new DrawBitmapRectGM(imageproc , "-imagerect"); )
DEF_GM( return new DrawBitmapRectGM(imagesubsetproc , "-imagerect-subset"); )
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