32 lines
1.4 KiB
C++
32 lines
1.4 KiB
C++
// Copyright 2019 Google LLC.
|
|
// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
|
|
#include "tools/fiddle/examples.h"
|
|
// HASH=df4e355c4845350daede833b4fd21ec1
|
|
REG_FIDDLE(Pixmap_readPixels, 256, 128, false, 0) {
|
|
void draw(SkCanvas* canvas) {
|
|
std::vector<int32_t> pixels;
|
|
const int width = 256;
|
|
const int height = 64;
|
|
pixels.resize(height * width * 4);
|
|
SkImageInfo srcInfo = SkImageInfo::MakeN32Premul(width, height);
|
|
SkPixmap srcPixmap(srcInfo, (const void*) &pixels.front(), width * 4);
|
|
SkColor gradColors[] = { 0xFFAA3300, 0x7F881122 };
|
|
SkPoint gradPoints[] = { { 0, 0 }, { 256, 0 } };
|
|
SkPaint paint;
|
|
paint.setShader(SkGradientShader::MakeLinear(gradPoints, gradColors, nullptr,
|
|
SK_ARRAY_COUNT(gradColors), SkTileMode::kClamp));
|
|
SkBitmap bitmap;
|
|
bitmap.installPixels(srcPixmap);
|
|
SkCanvas srcCanvas(bitmap);
|
|
srcCanvas.drawRect(SkRect::MakeWH(width, height), paint);
|
|
canvas->drawImage(bitmap.asImage(), 0, 0);
|
|
std::vector<int32_t> dstPixels;
|
|
dstPixels.resize(height * width * 2);
|
|
SkImageInfo dstInfo = srcInfo.makeColorType(kARGB_4444_SkColorType);
|
|
srcPixmap.readPixels(dstInfo, &dstPixels.front(), width * 2);
|
|
SkPixmap dstPixmap(dstInfo, &dstPixels.front(), width * 2);
|
|
bitmap.installPixels(dstPixmap);
|
|
canvas->drawImage(bitmap.asImage(), 0, 128);
|
|
}
|
|
} // END FIDDLE
|