Image_readPixels_2.cpp File Reference

#include "tools/fiddle/examples.h"

Go to the source code of this file.

Functions
	REG_FIDDLE (Image_readPixels_2, 256, 256, false, 3)

Function Documentation

REG_FIDDLE()

REG_FIDDLE	(	Image_readPixels_2	,
		256	,
		256	,
		false	,
		3
	)

Definition at line 5 of file Image_readPixels_2.cpp.

                                                   {
void draw(SkCanvas* canvas) {
    std::vector<int32_t> srcPixels;
    int rowBytes = image->width() * 4;
    int quarterWidth = image->width() / 4;
    int quarterHeight = image->height() / 4;
    srcPixels.resize(image->height() * rowBytes);
    for (int y = 0; y < 4; ++y) {
        for (int x = 0; x < 4; ++x) {
            SkPixmap pixmap(SkImageInfo::MakeN32Premul(quarterWidth, quarterHeight),
                    &srcPixels.front() + x * image->height() * quarterWidth +
                    y * quarterWidth, rowBytes);
            image->readPixels(nullptr, pixmap, x * quarterWidth, y * quarterHeight);
        }
    }
    canvas->scale(.5f, .5f);
    SkBitmap bitmap;
    bitmap.installPixels(SkImageInfo::MakeN32Premul(image->width(), image->height()),
                             &srcPixels.front(), rowBytes);
    canvas->drawImage(bitmap.asImage(), 0, 0);
}
}  // END FIDDLE