subsetshader.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/SkRect.h"
#include "include/core/SkShader.h"
#include "include/core/SkString.h"
#include "include/core/SkTileMode.h"
#include "tools/DecodeUtils.h"
#include "tools/Resources.h"

Go to the source code of this file.

Functions
	DEF_SIMPLE_GM_CAN_FAIL (bitmap_subset_shader, canvas, errorMsg, 256, 256)

Function Documentation

DEF_SIMPLE_GM_CAN_FAIL()

DEF_SIMPLE_GM_CAN_FAIL	(	bitmap_subset_shader	,
		canvas	,
		errorMsg	,
		256	,
		256
	)

Definition at line 21 of file subsetshader.cpp.

                                                                         {
    canvas->clear(SK_ColorWHITE);
 
    SkBitmap source;
    if (!ToolUtils::GetResourceAsBitmap("images/color_wheel.png", &source)) {
        *errorMsg = "Could not load images/color_wheel.png. "
                    "Did you forget to set the resourcePath?";
        return skiagm::DrawResult::kFail;
    }
    SkIRect left = SkIRect::MakeWH(source.width()/2, source.height());
    SkIRect right = SkIRect::MakeXYWH(source.width()/2, 0,
                                      source.width()/2, source.height());
    SkBitmap leftBitmap, rightBitmap;
    source.extractSubset(&leftBitmap, left);
    source.extractSubset(&rightBitmap, right);
 
    SkMatrix matrix;
    matrix.setScale(0.75f, 0.75f);
    matrix.preRotate(30.0f);
    SkTileMode tm = SkTileMode::kRepeat;
    SkPaint paint;
    paint.setShader(leftBitmap.makeShader(tm, tm, SkSamplingOptions(), matrix));
    canvas->drawRect(SkRect::MakeWH(256.0f, 128.0f), paint);
    paint.setShader(rightBitmap.makeShader(tm, tm, SkSamplingOptions(), matrix));
    canvas->drawRect(SkRect::MakeXYWH(0, 128.0f, 256.0f, 128.0f), paint);
    return skiagm::DrawResult::kOk;
}