skia2/docs/examples/gpu8888diff.cpp
Hal Canary 6c8422c671 add more docs/examples from named fiddles.
ignore offscreen, srgb, and animated fiddles for now.

Change-Id: I923131b684865698e6cda138b004930e11f504d5
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/263713
Commit-Queue: Hal Canary <halcanary@google.com>
Reviewed-by: Ben Wagner <bungeman@google.com>
2020-01-14 19:22:26 +00:00

33 lines
1.4 KiB
C++

// Copyright 2020 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"
REG_FIDDLE(gpu8888diff, 256, 256, false, 0) {
void draw(SkCanvas* canvas) {
canvas->scale(16, 16);
SkBitmap bitmap;
SkImageInfo imageInfo =
SkImageInfo::Make(2, 2, kRGBA_8888_SkColorType, kPremul_SkAlphaType);
bitmap.allocPixels(imageInfo);
SkCanvas offscreen(bitmap);
offscreen.clear(SK_ColorGREEN);
canvas->drawBitmap(bitmap, 0, 0);
offscreen.clear(SK_ColorGRAY);
canvas->drawBitmap(bitmap, 2, 2);
auto pack8888 = [](unsigned a, unsigned r, unsigned g, unsigned b) -> uint32_t {
return (a << 24) | (b << 16) | (g << 8) | (r << 0);
};
uint32_t red8888[] = {pack8888(0xFF, 0xFF, 0x0, 0x0), pack8888(0xFF, 0xbb, 0x0, 0x0),
pack8888(0xFF, 0x99, 0x0, 0x0), pack8888(0xFF, 0x55, 0x0, 0x0)};
uint32_t blue8888[] = {pack8888(0xFF, 0x0, 0x0, 0x0FF), pack8888(0xFF, 0x0, 0x0, 0x0bb),
pack8888(0xFF, 0x0, 0x0, 0x099), pack8888(0xFF, 0x0, 0x0, 0x055)};
SkPixmap redPixmap(imageInfo, &red8888, 8);
if (bitmap.writePixels(redPixmap, 0, 0)) {
canvas->drawBitmap(bitmap, 4, 4);
}
SkPixmap bluePixmap(imageInfo, &blue8888, 8);
if (bitmap.writePixels(bluePixmap, 0, 0)) {
canvas->drawBitmap(bitmap, 6, 6);
}
}
} // END FIDDLE