pictureshader.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/SkMatrix.h"
#include "include/core/SkPaint.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/SkTextBlob.h"
#include "include/core/SkTileMode.h"
#include "include/core/SkTypes.h"
#include "tools/ToolUtils.h"
#include "tools/fonts/FontToolUtils.h"

Go to the source code of this file.

Classes
class	PictureShaderGM

Functions
	DEF_SIMPLE_GM (tiled_picture_shader, canvas, 400, 400)
	DEF_SIMPLE_GM (pictureshader_persp, canvas, 215, 110)

Variables
struct {
SkTileMode   tmx
SkTileMode   tmy
}	kTileConfigs []

Function Documentation

DEF_SIMPLE_GM() [1/2]

DEF_SIMPLE_GM	(	pictureshader_persp	,
		canvas	,
		215	,
		110
	)

Definition at line 239 of file pictureshader.cpp.

                                                     {
    enum class DrawStrategy {
        kDirect,
        kPictureShader,
    };
 
    auto drawPicture = [](SkCanvas* canvas, sk_sp<SkPicture> picture, DrawStrategy strategy) {
        // Only want local upper 50x50 of 'picture' before we apply decal (or clip)
        SkRect bounds = {0.f, 0.f, 50.f, 50.f};
        switch(strategy) {
            case DrawStrategy::kDirect: {
                canvas->clipRect(bounds, true);
                canvas->drawPicture(picture);
                break; }
            case DrawStrategy::kPictureShader: {
                SkPaint paint;
                paint.setShader(picture->makeShader(SkTileMode::kDecal, SkTileMode::kDecal,
                                                    SkFilterMode::kLinear, nullptr, &bounds));
                canvas->drawRect({0.f, 0.f, 50.f, 50.f}, paint);
                break; }
        }
    };
 
    auto picture = []() {
        sk_sp<SkTypeface> typeface = ToolUtils::DefaultPortableTypeface();
        SkASSERT(typeface);
        SkFont font;
        font.setTypeface(typeface);
        font.setHinting(SkFontHinting::kNormal);
        font.setSize(8.f);
 
        SkPaint paint;
        paint.setColor(SK_ColorGREEN);
        SkPictureRecorder recorder;
        SkCanvas* record_canvas = recorder.beginRecording({0, 0, 100, 100});
        record_canvas->drawTextBlob(SkTextBlob::MakeFromString("Hamburgefons", font),
                                    0, 16.f, paint);
        return recorder.finishRecordingAsPicture();
    }();
 
    SkM44 m;
    m.preScale(2.f, 2.f);
    SkM44 persp = SkM44::Perspective(0.01f, 10.f, SK_ScalarPI / 3.f);
    persp.preTranslate(0.f, 5.f, -0.1f);
    persp.preConcat(SkM44::Rotate({0.f, 1.f, 0.f}, 0.008f));
    m.postConcat(persp);
 
    canvas->clear(SK_ColorBLACK);
    canvas->translate(5.f, 5.f);
    for (auto strategy : { DrawStrategy::kDirect,
                           DrawStrategy::kPictureShader }) {
        canvas->save();
 
        SkPaint outline;
        outline.setColor(SK_ColorWHITE);
        outline.setStyle(SkPaint::kStroke_Style);
        outline.setStrokeWidth(1.f);
        canvas->drawRect({-1, -1, 101, 101}, outline);
 
        canvas->clipRect({0, 0, 100, 100});
        canvas->concat(m);
 
        drawPicture(canvas, picture, strategy);
        canvas->restore();
 
        canvas->translate(105.f, 0.f);
    }
}

DEF_SIMPLE_GM() [2/2]

DEF_SIMPLE_GM	(	tiled_picture_shader	,
		canvas	,
		400	,
		400
	)

Definition at line 209 of file pictureshader.cpp.

                                                      {
    // https://code.google.com/p/skia/issues/detail?id=3398
    SkRect tile = SkRect::MakeWH(100, 100);
 
    SkPictureRecorder recorder;
    SkCanvas* c = recorder.beginRecording(tile);
 
    SkRect r = tile;
    r.inset(4, 4);
    SkPaint p;
    p.setColor(ToolUtils::color_to_565(0xFF303F9F));  // dark blue
    c->drawRect(r, p);
    p.setColor(ToolUtils::color_to_565(0xFFC5CAE9));  // light blue
    p.setStrokeWidth(10);
    c->drawLine(20, 20, 80, 80, p);
 
    sk_sp<SkPicture> picture(recorder.finishRecordingAsPicture());
 
    p.setColor(ToolUtils::color_to_565(0xFF8BC34A));  // green
    canvas->drawPaint(p);
 
    canvas->clipRect(SkRect::MakeXYWH(0, 0, 400, 350));
    p.setColor(0xFFB6B6B6);  // gray
    canvas->drawPaint(p);
 
    p.setShader(picture->makeShader(SkTileMode::kRepeat, SkTileMode::kRepeat,
                                    SkFilterMode::kNearest));
    canvas->drawPaint(p);
}

Variable Documentation

struct { ... } kTileConfigs[]

Initial value:

= {
    { SkTileMode::kRepeat, SkTileMode::kRepeat },
    { SkTileMode::kRepeat, SkTileMode::kClamp  },
    { SkTileMode::kMirror, SkTileMode::kRepeat },
}

tmx

SkTileMode tmx

Definition at line 30 of file pictureshader.cpp.

tmy

SkTileMode tmy

Definition at line 31 of file pictureshader.cpp.