imagemagnifier.cpp File Reference

#include "gm/gm.h"
#include "include/core/SkBitmap.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkColor.h"
#include "include/core/SkFont.h"
#include "include/core/SkImage.h"
#include "include/core/SkImageFilter.h"
#include "include/core/SkImageInfo.h"
#include "include/core/SkPaint.h"
#include "include/core/SkPixelRef.h"
#include "include/core/SkRRect.h"
#include "include/core/SkRect.h"
#include "include/core/SkRefCnt.h"
#include "include/core/SkScalar.h"
#include "include/core/SkTypeface.h"
#include "include/effects/SkImageFilters.h"
#include "src/base/SkRandom.h"
#include "tools/ToolUtils.h"
#include "tools/fonts/FontToolUtils.h"
#include "tools/timer/TimeUtils.h"
#include <utility>

Go to the source code of this file.

Classes
class	ImageMagnifierBounds

Macros
#define	WIDTH   500
#define	HEIGHT   500
#define	WIDTH_HEIGHT   256

Functions
static void	draw_content (SkCanvas *canvas, float maxTextSize, int count)
	DEF_SIMPLE_GM_BG (imagemagnifier, canvas, WIDTH, HEIGHT, SK_ColorBLACK)
static sk_sp< SkImage >	make_img ()
	DEF_SIMPLE_GM_BG (imagemagnifier_cropped, canvas, WIDTH_HEIGHT, WIDTH_HEIGHT, SK_ColorBLACK)

Macro Definition Documentation

HEIGHT

#define HEIGHT   500

Definition at line 32 of file imagemagnifier.cpp.

WIDTH

#define WIDTH   500

Definition at line 31 of file imagemagnifier.cpp.

WIDTH_HEIGHT

#define WIDTH_HEIGHT   256

Definition at line 59 of file imagemagnifier.cpp.

Function Documentation

DEF_SIMPLE_GM_BG() [1/2]

DEF_SIMPLE_GM_BG	(	imagemagnifier	,
		canvas	,
		WIDTH	,
		HEIGHT	,
		SK_ColorBLACK
	)

Definition at line 48 of file imagemagnifier.cpp.

                                                                       {
        SkPaint filterPaint;
        filterPaint.setImageFilter(
                SkImageFilters::Magnifier(SkRect::MakeWH(WIDTH, HEIGHT), 2.f, 100.f,
                                          SkFilterMode::kLinear, nullptr));
        canvas->saveLayer(nullptr, &filterPaint);
        draw_content(canvas, 300.f, 25);
        canvas->restore();
}

DEF_SIMPLE_GM_BG() [2/2]

DEF_SIMPLE_GM_BG	(	imagemagnifier_cropped	,
		canvas	,
		WIDTH_HEIGHT	,
		WIDTH_HEIGHT	,
		SK_ColorBLACK
	)

Definition at line 83 of file imagemagnifier.cpp.

                                                                                            {
    sk_sp<SkImageFilter> imageSource(SkImageFilters::Image(make_img(), SkFilterMode::kNearest));
 
    // Crop out a 16 pixel ring around the result
    const SkIRect cropRect = SkIRect::MakeXYWH(16, 16, WIDTH_HEIGHT-32, WIDTH_HEIGHT-32);
 
    SkPaint filterPaint;
    filterPaint.setImageFilter(SkImageFilters::Magnifier(
            SkRect::MakeWH(WIDTH_HEIGHT, WIDTH_HEIGHT),
            WIDTH_HEIGHT / (WIDTH_HEIGHT - 96.f), 64.f, {},
            std::move(imageSource),  &cropRect));
 
    canvas->saveLayer(nullptr, &filterPaint);
    canvas->restore();
}

draw_content()

static void draw_content ( SkCanvas *  canvas, float  maxTextSize, int  count  )

static

Definition at line 34 of file imagemagnifier.cpp.

                                                                         {
    const char* str = "The quick brown fox jumped over the lazy dog.";
    SkRandom rand;
    SkFont   font = ToolUtils::DefaultPortableFont();
    for (int i = 0; i < count; ++i) {
        int x = rand.nextULessThan(WIDTH);
        int y = rand.nextULessThan(HEIGHT);
        SkPaint paint;
        paint.setColor(ToolUtils::color_to_565(rand.nextBits(24) | 0xFF000000));
        font.setSize(rand.nextRangeScalar(0, maxTextSize));
        canvas->drawString(str, SkIntToScalar(x), SkIntToScalar(y), font, paint);
    }
}

make_img()

static sk_sp< SkImage > make_img ( )

static

Definition at line 61 of file imagemagnifier.cpp.

                                 {
    SkBitmap bitmap;
    bitmap.allocN32Pixels(WIDTH_HEIGHT, WIDTH_HEIGHT);
    SkCanvas canvas(bitmap);
 
    canvas.clear(0x0);
 
    SkPaint paint;
    paint.setColor(SK_ColorBLUE);
 
    for (float pos = 0; pos < WIDTH_HEIGHT; pos += 16) {
        canvas.drawLine(0, pos, SkIntToScalar(WIDTH_HEIGHT), pos, paint);
        canvas.drawLine(pos, 0, pos, SkIntToScalar(WIDTH_HEIGHT), paint);
    }
 
    SkBitmap result;
    result.setInfo(SkImageInfo::MakeS32(WIDTH_HEIGHT, WIDTH_HEIGHT, kPremul_SkAlphaType));
    result.setPixelRef(sk_ref_sp(bitmap.pixelRef()), 0, 0);
 
    return result.asImage();
}