pictureimagegenerator.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/SkColorSpace.h"
#include "include/core/SkFont.h"
#include "include/core/SkFontTypes.h"
#include "include/core/SkImage.h"
#include "include/core/SkImageGenerator.h"
#include "include/core/SkImageInfo.h"
#include "include/core/SkMatrix.h"
#include "include/core/SkPaint.h"
#include "include/core/SkPath.h"
#include "include/core/SkPicture.h"
#include "include/core/SkPictureRecorder.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/pathops/SkPathOps.h"
#include "include/utils/SkTextUtils.h"
#include "src/image/SkImageGeneratorPriv.h"
#include "tools/ToolUtils.h"
#include "tools/fonts/FontToolUtils.h"
#include <string.h>
#include <memory>

Go to the source code of this file.

Classes
class	PictureGeneratorGM

Functions
static void	draw_vector_logo (SkCanvas *canvas, const SkRect &viewBox)

Function Documentation

draw_vector_logo()

static void draw_vector_logo ( SkCanvas *  canvas, const SkRect &  viewBox  )

static

Definition at line 43 of file pictureimagegenerator.cpp.

                                                                      {
    constexpr char kSkiaStr[] = "SKIA";
    constexpr SkScalar kGradientPad = .1f;
    constexpr SkScalar kVerticalSpacing = 0.25f;
    constexpr SkScalar kAccentScale = 1.20f;
 
    SkPaint paint;
    paint.setAntiAlias(true);
 
    SkFont font = ToolUtils::DefaultPortableFont();
    font.setSubpixel(true);
    font.setEmbolden(true);
 
    SkPath path;
    SkRect iBox, skiBox, skiaBox;
    SkTextUtils::GetPath("SKI", 3, SkTextEncoding::kUTF8, 0, 0, font, &path);
    TightBounds(path, &skiBox);
    SkTextUtils::GetPath("I", 1, SkTextEncoding::kUTF8, 0, 0, font, &path);
    TightBounds(path, &iBox);
    iBox.offsetTo(skiBox.fRight - iBox.width(), iBox.fTop);
 
    const size_t textLen = strlen(kSkiaStr);
    SkTextUtils::GetPath(kSkiaStr, textLen, SkTextEncoding::kUTF8, 0, 0, font, &path);
    TightBounds(path, &skiaBox);
    skiaBox.outset(0, 2 * iBox.width() * (kVerticalSpacing + 1));
 
    const SkScalar accentSize = iBox.width() * kAccentScale;
    const SkScalar underlineY = iBox.bottom() +
        (kVerticalSpacing + SkScalarSqrt(3) / 2) * accentSize;
    SkAutoCanvasRestore acr(canvas, true);
    canvas->concat(SkMatrix::RectToRect(skiaBox, viewBox));
 
    canvas->drawCircle(iBox.centerX(),
                       iBox.y() - (0.5f + kVerticalSpacing) * accentSize,
                       accentSize / 2,
                       paint);
 
    path.reset();
    path.moveTo(iBox.centerX() - accentSize / 2, iBox.bottom() + kVerticalSpacing * accentSize);
    path.rLineTo(accentSize, 0);
    path.lineTo(iBox.centerX(), underlineY);
    canvas->drawPath(path, paint);
 
    SkRect underlineRect = SkRect::MakeLTRB(iBox.centerX() - iBox.width() * accentSize * 3,
                                            underlineY,
                                            iBox.centerX(),
                                            underlineY + accentSize / 10);
    const SkPoint pts1[] = { SkPoint::Make(underlineRect.x(), 0),
                             SkPoint::Make(iBox.centerX(), 0) };
    const SkScalar pos1[] = { 0, 0.75f };
    const SkColor colors1[] = { SK_ColorTRANSPARENT, SK_ColorBLACK };
    SkASSERT(std::size(pos1) == std::size(colors1));
    paint.setShader(SkGradientShader::MakeLinear(pts1, colors1, pos1, std::size(pos1),
                                                 SkTileMode::kClamp));
    canvas->drawRect(underlineRect, paint);
 
    const SkPoint pts2[] = { SkPoint::Make(iBox.x() - iBox.width() * kGradientPad, 0),
                             SkPoint::Make(iBox.right() + iBox.width() * kGradientPad, 0) };
    const SkScalar pos2[] = { 0, .01f, 1.0f/3, 1.0f/3, 2.0f/3, 2.0f/3, .99f, 1 };
    const SkColor colors2[] = {
        SK_ColorBLACK,
        0xffca5139,
        0xffca5139,
        0xff8dbd53,
        0xff8dbd53,
        0xff5460a5,
        0xff5460a5,
        SK_ColorBLACK
    };
    SkASSERT(std::size(pos2) == std::size(colors2));
    paint.setShader(SkGradientShader::MakeLinear(pts2, colors2, pos2, std::size(pos2),
                                                 SkTileMode::kClamp));
    canvas->drawSimpleText(kSkiaStr, textLen, SkTextEncoding::kUTF8, 0, 0, font, paint);
}