skia2/docs/examples/Canvas_copy_const_SkBitmap.cpp
Mike Klein c0bd9f9fe5 rewrite includes to not need so much -Ifoo
Current strategy: everything from the top

Things to look at first are the manual changes:

   - added tools/rewrite_includes.py
   - removed -Idirectives from BUILD.gn
   - various compile.sh simplifications
   - tweak tools/embed_resources.py
   - update gn/find_headers.py to write paths from the top
   - update gn/gn_to_bp.py SkUserConfig.h layout
     so that #include "include/config/SkUserConfig.h" always
     gets the header we want.

No-Presubmit: true
Change-Id: I73a4b181654e0e38d229bc456c0d0854bae3363e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/209706
Commit-Queue: Mike Klein <mtklein@google.com>
Reviewed-by: Hal Canary <halcanary@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
2019-04-24 16:27:11 +00:00

29 lines
1.2 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=dd92db963af190e849894038f39b598a
REG_FIDDLE(Canvas_copy_const_SkBitmap, 256, 256, true, 0) {
void draw(SkCanvas* ) {
SkBitmap bitmap;
// create a bitmap 5 wide and 11 high
bitmap.allocPixels(SkImageInfo::MakeN32Premul(5, 11));
SkCanvas canvas(bitmap);
canvas.clear(SK_ColorWHITE); // white is Unpremultiplied, in ARGB order
SkPixmap pixmap; // provides guaranteed access to the drawn pixels
if (!canvas.peekPixels(&pixmap)) {
SkDebugf("peekPixels should never fail.\n");
}
const SkPMColor* pixels = pixmap.addr32(); // points to top-left of bitmap
SkPMColor pmWhite = pixels[0]; // the Premultiplied format may vary
SkPaint paint; // by default, draws black, 12 point text
SkFont font;
canvas.drawString("!", 1, 10, font, paint); // 1 char at baseline (1, 10)
for (int y = 0; y < bitmap.height(); ++y) {
for (int x = 0; x < bitmap.width(); ++x) {
SkDebugf("%c", *pixels++ == pmWhite ? '-' : 'x');
}
SkDebugf("\n");
}
}
} // END FIDDLE