orientation.cpp File Reference

#include "gm/gm.h"
#include "include/codec/SkEncodedOrigin.h"
#include "include/core/SkBlurTypes.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkFont.h"
#include "include/core/SkImage.h"
#include "include/core/SkMaskFilter.h"
#include "include/core/SkRefCnt.h"
#include "include/core/SkSize.h"
#include "include/core/SkString.h"
#include "include/core/SkSurface.h"
#include "tools/DecodeUtils.h"
#include "tools/EncodeUtils.h"
#include "tools/Resources.h"
#include "tools/ToolUtils.h"
#include "tools/fonts/FontToolUtils.h"

Go to the source code of this file.

Macros
#define	MAKE_GM(subsample)

Functions
static void	make_images ()
static void	draw (SkCanvas *canvas, const char *suffix)

Variables
static constexpr int	kImgW = 100
static constexpr int	kImgH = 80

Macro Definition Documentation

MAKE_GM

#define MAKE_GM

(

subsample

)

Value:

        DEF_SIMPLE_GM(orientation_##subsample, canvas, 4*kImgW, 2*kImgH) { \
        draw(canvas, "_" #subsample);                                                         \
}

Definition at line 151 of file orientation.cpp.

                                                                                            { \
        draw(canvas, "_" #subsample);                                                         \
}

Function Documentation

draw()

static void draw ( SkCanvas *  canvas, const char *  suffix  )

static

Definition at line 129 of file orientation.cpp.

                                                       {
    // Avoid unused function warning.
    if ((false)) {
        make_images();
    }
    canvas->save();
    for (char i = '1'; i <= '8'; i++) {
        SkString path = SkStringPrintf("images/orientation/%c%s.jpg", i, suffix);
        auto image = ToolUtils::GetResourceAsImage(path.c_str());
        if (!image) {
            continue;
        }
        canvas->drawImage(image, 0, 0);
        if ('4' == i) {
            canvas->restore();
            canvas->translate(0, image->height());
        } else {
            canvas->translate(image->width(), 0);
        }
    }
}

make_images()

static void make_images ( )

static

This function was used to create the images used by these test. It saves them as PNGs (so they are lossless). Then the following bash script was used to create the oriented JPGs with imagemagick and exiftool: #!/bin/bash

for s in 444 422 420 440 411 410; do for i in {1..8}; do magick convert $i.png -sampling-factor ${s:0:1}:${s:1:1}:${s:2:1} $i_$s.jpg; exiftool -orientation=$i -n -m -overwrite_original $i_$s.jpg; done done

Definition at line 42 of file orientation.cpp.

                          {
    for (int i = 1; i <= 8; ++i) {
        SkISize size{kImgW, kImgH};
        SkEncodedOrigin origin = static_cast<SkEncodedOrigin>(i);
        // We apply the inverse transformation to the PNG we generate, convert the PNG to a
        // a JPEG using magick, then modify the JPEG's tag using exiftool (without modifying the
        // stored JPEG data).
        if (origin >= kLeftTop_SkEncodedOrigin) {
            // The last four SkEncodedOrigin values involve 90 degree rotations
            using std::swap;
            swap(size.fWidth, size.fHeight);
        }
        using std::swap;
        auto surf = SkSurfaces::Raster(
                SkImageInfo::Make(size, kRGBA_8888_SkColorType, kPremul_SkAlphaType));
        auto* canvas = surf->getCanvas();
        SkMatrix m = SkEncodedOriginToMatrix(origin, kImgW, kImgH);
        SkAssertResult(m.invert(&m));
        canvas->concat(m);
        canvas->clear(SK_ColorBLACK);
        SkPaint paint;
        paint.setColor(SK_ColorRED);
        SkScalar midX = kImgW / 2.f;
        SkScalar midY = kImgH / 2.f;
        SkScalar w = midX - 1;
        SkScalar h = midY - 1;
        canvas->drawRect(SkRect::MakeXYWH(1, 1, w, h), paint);
        paint.setColor(SK_ColorBLUE);
        canvas->drawRect(SkRect::MakeXYWH(midX, 1, w, h), paint);
        paint.setColor(SK_ColorGREEN);
        canvas->drawRect(SkRect::MakeXYWH(1, midY, w, h), paint);
        paint.setColor(SK_ColorYELLOW);
        canvas->drawRect(SkRect::MakeXYWH(midX, midY, w, h), paint);
        SkFont font(ToolUtils::DefaultPortableTypeface(), kImgH / 4.f);
 
        SkPaint blurPaint;
        blurPaint.setMaskFilter(SkMaskFilter::MakeBlur(kNormal_SkBlurStyle, .75f));
        blurPaint.setColor(SK_ColorBLACK);
        paint.setColor(SK_ColorWHITE);
 
        auto drawLabel = [&](const char* string, SkScalar x, SkScalar y) {
            canvas->save();
            canvas->translate(1, 1);
            canvas->drawString(string, x, y, font, blurPaint);
            canvas->restore();
            canvas->drawString(string, x, y, font, paint);
        };
 
        auto measure = [&font](const char* text) {
            SkRect bounds;
            font.measureText(text, strlen(text), SkTextEncoding::kUTF8, &bounds);
            return bounds;
        };
 
        static constexpr SkScalar kPad = 3.f;
        SkRect bounds;
 
        bounds = measure("top");
        drawLabel("top", midX - bounds.centerX(), -bounds.top() + kPad);
 
        bounds = measure("bottom");
        drawLabel("bottom", midX - bounds.centerX(), kImgH - kPad - bounds.bottom());
 
        // It looks weird if "left" and "right" and the number at the center aren't vertically
        // aligned.
        SkScalar baseY = midY - measure("leftright").centerY();
        bounds = measure("left");
        drawLabel("left", kPad - bounds.left(), baseY);
 
        bounds = measure("right");
        drawLabel("right", kImgW - kPad - bounds.right(), baseY);
 
        SkString num = SkStringPrintf("%d", i);
        bounds = measure(num.c_str());
        drawLabel(num.c_str(), midX - bounds.centerX(), baseY);
        num.append(".png");
        SkPixmap pm;
        surf->makeImageSnapshot()->peekPixels(&pm);
        ToolUtils::EncodeImageToPngFile(num.c_str(), pm);
    }
}

Variable Documentation

kImgH

constexpr int kImgH = 80

staticconstexpr

Definition at line 26 of file orientation.cpp.

kImgW

constexpr int kImgW = 100

staticconstexpr

Definition at line 25 of file orientation.cpp.