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Bitmap_writePixels.cpp File Reference
#include "tools/fiddle/examples.h"

Go to the source code of this file.

Functions

 REG_FIDDLE (Bitmap_writePixels, 256, 256, false, 3)
 

Function Documentation

◆ REG_FIDDLE()

REG_FIDDLE ( Bitmap_writePixels  ,
256  ,
256  ,
false  ,
 
)

Definition at line 5 of file Bitmap_writePixels.cpp.

5 {
6void draw(SkCanvas* canvas) {
7 std::vector<int32_t> srcPixels;
8 int width = image->width();
9 int height = image->height();
10 srcPixels.resize(height * width * 4);
11 SkPixmap pixmap(SkImageInfo::MakeN32Premul(width, height), (const void*) &srcPixels.front(),
12 width * 4);
13 image->readPixels(nullptr, pixmap, 0, 0);
14 canvas->scale(.5f, .5f);
15 width /= 4;
16 height /= 4;
17 for (int y = 0; y < 4; ++y) {
18 for (int x = 0; x < 4; ++x) {
21 bitmap.writePixels(pixmap, -y * width, -x * height);
22 canvas->drawImage(bitmap.asImage(), x * width, y * height);
23 }
24 }
25}
26} // END FIDDLE
static void draw(SkCanvas *canvas, SkRect &target, int x, int y)
Definition aaclip.cpp:27
void scale(SkScalar sx, SkScalar sy)
void drawImage(const SkImage *image, SkScalar left, SkScalar top)
Definition SkCanvas.h:1528
bool readPixels(GrDirectContext *context, const SkImageInfo &dstInfo, void *dstPixels, size_t dstRowBytes, int srcX, int srcY, CachingHint cachingHint=kAllow_CachingHint) const
Definition SkImage.cpp:42
int width() const
Definition SkImage.h:285
int height() const
Definition SkImage.h:291
sk_sp< SkImage > image
Definition examples.cpp:29
double y
double x
int32_t height
int32_t width
static SkImageInfo MakeN32Premul(int width, int height)