1*c8dee2aaSAndroid Build Coastguard Worker // Copyright 2019 Google LLC.
2*c8dee2aaSAndroid Build Coastguard Worker // Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
3*c8dee2aaSAndroid Build Coastguard Worker #include "tools/fiddle/examples.h"
4*c8dee2aaSAndroid Build Coastguard Worker REG_FIDDLE(Alpha_Constants_b, 256, 128, false, 1) {
draw(SkCanvas * canvas)5*c8dee2aaSAndroid Build Coastguard Worker void draw(SkCanvas* canvas) {
6*c8dee2aaSAndroid Build Coastguard Worker std::vector<int32_t> srcPixels;
7*c8dee2aaSAndroid Build Coastguard Worker srcPixels.resize(source.height() * source.rowBytes());
8*c8dee2aaSAndroid Build Coastguard Worker SkPixmap pixmap(SkImageInfo::MakeN32Premul(source.width(), source.height()),
9*c8dee2aaSAndroid Build Coastguard Worker &srcPixels.front(), source.rowBytes());
10*c8dee2aaSAndroid Build Coastguard Worker source.readPixels(pixmap, 0, 0);
11*c8dee2aaSAndroid Build Coastguard Worker for (int y = 0; y < source.height(); ++y) {
12*c8dee2aaSAndroid Build Coastguard Worker for (int x = 0; x < source.width(); ++x) {
13*c8dee2aaSAndroid Build Coastguard Worker SkPMColor pixel = srcPixels[y * source.width() + x];
14*c8dee2aaSAndroid Build Coastguard Worker const SkColor color = SkUnPreMultiply::PMColorToColor(pixel);
15*c8dee2aaSAndroid Build Coastguard Worker if (SkColorGetA(color) == SK_AlphaOPAQUE) {
16*c8dee2aaSAndroid Build Coastguard Worker srcPixels[y * source.width() + x] = SK_ColorGREEN;
17*c8dee2aaSAndroid Build Coastguard Worker }
18*c8dee2aaSAndroid Build Coastguard Worker }
19*c8dee2aaSAndroid Build Coastguard Worker }
20*c8dee2aaSAndroid Build Coastguard Worker canvas->drawImage(SkImages::RasterFromPixmapCopy(pixmap), 0, 0);
21*c8dee2aaSAndroid Build Coastguard Worker }
22*c8dee2aaSAndroid Build Coastguard Worker } // END FIDDLE
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