imageblur2.cpp File Reference

#include "gm/gm.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkFont.h"
#include "include/core/SkImageFilter.h"
#include "include/core/SkPaint.h"
#include "include/core/SkScalar.h"
#include "include/core/SkTypeface.h"
#include "include/core/SkTypes.h"
#include "include/effects/SkImageFilters.h"
#include "src/base/SkRandom.h"
#include "tools/ToolUtils.h"
#include "tools/fonts/FontToolUtils.h"

Go to the source code of this file.

Functions
	DEF_SIMPLE_GM (imageblur2, canvas, kWidth, kHeight)

Variables
constexpr int	kWidth = 500
constexpr int	kHeight = 500

Function Documentation

DEF_SIMPLE_GM()

DEF_SIMPLE_GM	(	imageblur2	,
		canvas	,
		kWidth	,
		kHeight
	)

Definition at line 25 of file imageblur2.cpp.

                                                   {
    constexpr float kBlurSigmas[] = { 0.0, 0.3f, 0.5f, 2.0f, 32.0f, 80.0f };
    const char* kTestStrings[] = {
        "The quick`~",
        "brown fox[]",
        "jumped over",
        "the lazy@#$",
        "dog.{}!%^&",
        "*()+=-\\'\"/",
    };
    constexpr int sigmaCount = std::size(kBlurSigmas);
    constexpr int testStringCount = std::size(kTestStrings);
    constexpr SkScalar dx = kWidth / sigmaCount;
    constexpr SkScalar dy = kHeight / sigmaCount;
    constexpr SkScalar textSize = 12;
 
    SkFont font(ToolUtils::DefaultPortableTypeface(), textSize);
    font.setEdging(SkFont::Edging::kAlias);
 
    for (int x = 0; x < sigmaCount; x++) {
        SkScalar sigmaX = kBlurSigmas[x];
        for (int y = 0; y < sigmaCount; y++) {
            SkScalar sigmaY = kBlurSigmas[y];
 
            SkPaint paint;
            paint.setImageFilter(SkImageFilters::Blur(sigmaX, sigmaY, nullptr));
            canvas->saveLayer(nullptr, &paint);
 
            SkRandom rand;
            SkPaint textPaint;
            textPaint.setColor(ToolUtils::color_to_565(rand.nextBits(24) | 0xFF000000));
            for (int i = 0; i < testStringCount; i++) {
                canvas->drawString(kTestStrings[i],
                                   SkIntToScalar(x * dx),
                                   SkIntToScalar(y * dy + textSize * i + textSize),
                                   font,
                                   textPaint);
            }
            canvas->restore();
        }
    }
}

Variable Documentation

kHeight

constexpr int kHeight = 500

constexpr

Definition at line 23 of file imageblur2.cpp.

kWidth

constexpr int kWidth = 500

constexpr

Definition at line 22 of file imageblur2.cpp.