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skia2/gm/tilemodes.cpp
Mike Reed 057fcbec5d Use sampling for bitmap shaders 
Change-Id: Ifa656ffc83a1adb5670cff1e2ce77f2edb1d6b03
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/343776
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
2020-12-12 20:10:41 +00:00

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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/gm.h"
#include "include/core/SkBitmap.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkColor.h"
#include "include/core/SkFilterQuality.h"
#include "include/core/SkFont.h"
#include "include/core/SkImage.h"
#include "include/core/SkImageInfo.h"
#include "include/core/SkPaint.h"
#include "include/core/SkPoint.h"
#include "include/core/SkRect.h"
#include "include/core/SkRefCnt.h"
#include "include/core/SkScalar.h"
#include "include/core/SkShader.h"
#include "include/core/SkSize.h"
#include "include/core/SkString.h"
#include "include/core/SkTileMode.h"
#include "include/core/SkTypeface.h"
#include "include/core/SkTypes.h"
#include "include/effects/SkGradientShader.h"
#include "include/utils/SkTextUtils.h"
#include "tools/Resources.h"
#include "tools/ToolUtils.h"
#include <functional>
static void makebm(SkBitmap* bm, SkColorType ct, int w, int h) {
bm->allocPixels(SkImageInfo::Make(w, h, ct, kPremul_SkAlphaType));
bm->eraseColor(SK_ColorTRANSPARENT);
SkCanvas canvas(*bm);
SkPoint pts[] = { { 0, 0 }, { SkIntToScalar(w), SkIntToScalar(h)} };
SkColor colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE };
SkScalar pos[] = { 0, SK_Scalar1/2, SK_Scalar1 };
SkPaint paint;
paint.setDither(true);
paint.setShader(SkGradientShader::MakeLinear(pts, colors, pos, SK_ARRAY_COUNT(colors),
SkTileMode::kClamp));
canvas.drawPaint(paint);
}
static void setup(SkPaint* paint, const SkBitmap& bm, SkFilterMode fm,
SkTileMode tmx, SkTileMode tmy) {
paint->setShader(bm.makeShader(tmx, tmy, SkSamplingOptions(fm, SkMipmapMode::kNone)));
}
constexpr SkColorType gColorTypes[] = {
kN32_SkColorType,
kRGB_565_SkColorType,
};
class TilingGM : public skiagm::GM {
public:
TilingGM(bool powerOfTwoSize)
: fPowerOfTwoSize(powerOfTwoSize) {
}
SkBitmap fTexture[SK_ARRAY_COUNT(gColorTypes)];
protected:
enum {
kPOTSize = 32,
kNPOTSize = 21,
};
SkString onShortName() override {
SkString name("tilemodes");
if (!fPowerOfTwoSize) {
name.append("_npot");
}
return name;
}
SkISize onISize() override { return SkISize::Make(880, 560); }
void onOnceBeforeDraw() override {
int size = fPowerOfTwoSize ? kPOTSize : kNPOTSize;
for (size_t i = 0; i < SK_ARRAY_COUNT(gColorTypes); i++) {
makebm(&fTexture[i], gColorTypes[i], size, size);
}
}
void onDraw(SkCanvas* canvas) override {
SkPaint textPaint;
SkFont font(ToolUtils::create_portable_typeface(), 12);
int size = fPowerOfTwoSize ? kPOTSize : kNPOTSize;
SkRect r = { 0, 0, SkIntToScalar(size*2), SkIntToScalar(size*2) };
const char* gConfigNames[] = { "8888", "565", "4444" };
constexpr SkFilterMode gFilters[] = { SkFilterMode::kNearest, SkFilterMode::kLinear };
static const char* gFilterNames[] = { "point", "bilinear" };
constexpr SkTileMode gModes[] = {
SkTileMode::kClamp, SkTileMode::kRepeat, SkTileMode::kMirror };
static const char* gModeNames[] = { "C", "R", "M" };
SkScalar y = SkIntToScalar(24);
SkScalar x = SkIntToScalar(10);
for (size_t kx = 0; kx < SK_ARRAY_COUNT(gModes); kx++) {
for (size_t ky = 0; ky < SK_ARRAY_COUNT(gModes); ky++) {
SkPaint p;
p.setDither(true);
SkString str;
SkFont font(ToolUtils::create_portable_typeface());
str.printf("[%s,%s]", gModeNames[kx], gModeNames[ky]);
SkTextUtils::DrawString(canvas, str.c_str(), x + r.width()/2, y, font, p,
SkTextUtils::kCenter_Align);
x += r.width() * 4 / 3;
}
}
y += SkIntToScalar(16);
for (size_t i = 0; i < SK_ARRAY_COUNT(gColorTypes); i++) {
for (size_t j = 0; j < SK_ARRAY_COUNT(gFilters); j++) {
x = SkIntToScalar(10);
for (size_t kx = 0; kx < SK_ARRAY_COUNT(gModes); kx++) {
for (size_t ky = 0; ky < SK_ARRAY_COUNT(gModes); ky++) {
SkPaint paint;
#if 1 // Temporary change to regen bitmap before each draw. This may help tracking down an issue
// on SGX where resizing NPOT textures to POT textures exhibits a driver bug.
if (!fPowerOfTwoSize) {
makebm(&fTexture[i], gColorTypes[i], size, size);
}
#endif
setup(&paint, fTexture[i], gFilters[j], gModes[kx], gModes[ky]);
paint.setDither(true);
canvas->save();
canvas->translate(x, y);
canvas->drawRect(r, paint);
canvas->restore();
x += r.width() * 4 / 3;
}
}
canvas->drawString(SkStringPrintf("%s, %s", gConfigNames[i], gFilterNames[j]),
x, y + r.height() * 2 / 3, font, textPaint);
y += r.height() * 4 / 3;
}
}
}
private:
bool fPowerOfTwoSize;
using INHERITED = skiagm::GM;
};
DEF_GM( return new TilingGM(true); )
DEF_GM( return new TilingGM(false); )
constexpr int gWidth = 32;
constexpr int gHeight = 32;
static sk_sp<SkShader> make_bm(SkTileMode tx, SkTileMode ty) {
SkBitmap bm;
makebm(&bm, kN32_SkColorType, gWidth, gHeight);
return bm.makeShader(tx, ty, SkSamplingOptions());
}
static sk_sp<SkShader> make_grad(SkTileMode tx, SkTileMode ty) {
SkPoint pts[] = { { 0, 0 }, { SkIntToScalar(gWidth), SkIntToScalar(gHeight)} };
SkPoint center = { SkIntToScalar(gWidth)/2, SkIntToScalar(gHeight)/2 };
SkScalar rad = SkIntToScalar(gWidth)/2;
SkColor colors[] = {0xFFFF0000, ToolUtils::color_to_565(0xFF0044FF)};
int index = (int)ty;
switch (index % 3) {
case 0:
return SkGradientShader::MakeLinear(pts, colors, nullptr, SK_ARRAY_COUNT(colors), tx);
case 1:
return SkGradientShader::MakeRadial(center, rad, colors, nullptr, SK_ARRAY_COUNT(colors), tx);
case 2:
return SkGradientShader::MakeSweep(center.fX, center.fY, colors, nullptr,
SK_ARRAY_COUNT(colors), tx, 135, 225, 0, nullptr);
}
return nullptr;
}
typedef sk_sp<SkShader> (*ShaderProc)(SkTileMode, SkTileMode);
class Tiling2GM : public skiagm::GM {
ShaderProc fProc;
const char* fName;
public:
Tiling2GM(ShaderProc proc, const char name[]) : fProc(proc), fName(name) {}
private:
SkString onShortName() override { return SkString(fName); }
SkISize onISize() override { return SkISize::Make(650, 610); }
void onDraw(SkCanvas* canvas) override {
canvas->scale(SkIntToScalar(3)/2, SkIntToScalar(3)/2);
const SkScalar w = SkIntToScalar(gWidth);
const SkScalar h = SkIntToScalar(gHeight);
SkRect r = { -w, -h, w*2, h*2 };
constexpr SkTileMode gModes[] = {
SkTileMode::kClamp, SkTileMode::kRepeat, SkTileMode::kMirror
};
const char* gModeNames[] = {
"Clamp", "Repeat", "Mirror"
};
SkScalar y = SkIntToScalar(24);
SkScalar x = SkIntToScalar(66);
SkFont font(ToolUtils::create_portable_typeface());
for (size_t kx = 0; kx < SK_ARRAY_COUNT(gModes); kx++) {
SkString str(gModeNames[kx]);
SkTextUtils::DrawString(canvas, str.c_str(), x + r.width()/2, y, font, SkPaint(),
SkTextUtils::kCenter_Align);
x += r.width() * 4 / 3;
}
y += SkIntToScalar(16) + h;
for (size_t ky = 0; ky < SK_ARRAY_COUNT(gModes); ky++) {
x = SkIntToScalar(16) + w;
SkString str(gModeNames[ky]);
SkTextUtils::DrawString(canvas, str.c_str(), x, y + h/2, font, SkPaint(),
SkTextUtils::kRight_Align);
x += SkIntToScalar(50);
for (size_t kx = 0; kx < SK_ARRAY_COUNT(gModes); kx++) {
SkPaint paint;
paint.setShader(fProc(gModes[kx], gModes[ky]));
canvas->save();
canvas->translate(x, y);
canvas->drawRect(r, paint);
canvas->restore();
x += r.width() * 4 / 3;
}
y += r.height() * 4 / 3;
}
}
};
DEF_GM( return new Tiling2GM(make_bm, "tilemode_bitmap"); )
DEF_GM( return new Tiling2GM(make_grad, "tilemode_gradient"); )
////////////////////
DEF_SIMPLE_GM(tilemode_decal, canvas, 720, 1100) {
auto img = GetResourceAsImage("images/mandrill_128.png");
SkPaint bgpaint;
bgpaint.setColor(SK_ColorYELLOW);
SkRect r = { -20, -20, img->width() + 20.0f, img->height() + 20.0f };
canvas->translate(45, 45);
std::function<void(SkPaint*, SkTileMode, SkTileMode)> shader_procs[] = {
[img](SkPaint* paint, SkTileMode tx, SkTileMode ty) {
// Test no filtering with decal mode
paint->setShader(img->makeShader(tx, ty, SkSamplingOptions(kNone_SkFilterQuality)));
},
[img](SkPaint* paint, SkTileMode tx, SkTileMode ty) {
// Test bilerp approximation for decal mode (or clamp to border HW)
paint->setShader(img->makeShader(tx, ty, SkSamplingOptions(kLow_SkFilterQuality)));
},
[img](SkPaint* paint, SkTileMode tx, SkTileMode ty) {
// Test bicubic filter with decal mode
paint->setShader(img->makeShader(tx, ty, SkSamplingOptions(kHigh_SkFilterQuality)));
},
[img](SkPaint* paint, SkTileMode tx, SkTileMode ty) {
SkColor colors[] = { SK_ColorRED, SK_ColorBLUE };
const SkPoint pts[] = {{ 0, 0 }, {img->width()*1.0f, img->height()*1.0f }};
const SkScalar* pos = nullptr;
const int count = SK_ARRAY_COUNT(colors);
paint->setShader(SkGradientShader::MakeLinear(pts, colors, pos, count, tx));
},
[img](SkPaint* paint, SkTileMode tx, SkTileMode ty) {
SkColor colors[] = { SK_ColorRED, SK_ColorBLUE };
const SkScalar* pos = nullptr;
const int count = SK_ARRAY_COUNT(colors);
paint->setShader(SkGradientShader::MakeRadial({ img->width()*0.5f, img->width()*0.5f },
img->width()*0.5f, colors, pos, count, tx));
},
};
const struct XY {
SkTileMode fX;
SkTileMode fY;
} pairs[] = {
{ SkTileMode::kClamp, SkTileMode::kClamp },
{ SkTileMode::kClamp, SkTileMode::kDecal },
{ SkTileMode::kDecal, SkTileMode::kClamp },
{ SkTileMode::kDecal, SkTileMode::kDecal },
};
for (const auto& p : pairs) {
SkPaint paint;
canvas->save();
for (const auto& proc : shader_procs) {
canvas->save();
// Apply a slight rotation to highlight the differences between filtered and unfiltered
// decal edges
canvas->rotate(4);
canvas->drawRect(r, bgpaint);
proc(&paint, p.fX, p.fY);
canvas->drawRect(r, paint);
canvas->restore();
canvas->translate(0, r.height() + 20);
}
canvas->restore();
canvas->translate(r.width() + 10, 0);
}
}
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