skia2/tools/picture_utils.cpp

/*
 * Copyright 2012 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#include "picture_utils.h"
#include "SkBitmap.h"
#include "SkPicture.h"
#include "SkString.h"
#include "SkStream.h"

namespace sk_tools {

    void make_filepath(SkString* path, const SkString& dir, const SkString& name) {
        size_t len = dir.size();
        path->set(dir);
        if (0 < len  && '/' != dir[len - 1]) {
            path->append("/");
        }
        path->append(name);
    }

    namespace {
        bool is_path_seperator(const char chr) {
#if defined(SK_BUILD_FOR_WIN)
            return chr == '\\' || chr == '/';
#else
            return chr == '/';
#endif
        }
    }

    void get_basename(SkString* basename, const SkString& path) {
        if (path.size() == 0) {
            basename->reset();
            return;
        }

        size_t end = path.size() - 1;

        // Paths pointing to directories often have a trailing slash,
        // we remove it so the name is not empty
        if (is_path_seperator(path[end])) {
            if (end == 0) {
                basename->reset();
                return;
            }

            end -= 1;
        }

        size_t i = end;
        do {
            --i;
            if (is_path_seperator(path[i])) {
                  const char* basenameStart = path.c_str() + i + 1;
                  size_t basenameLength = end - i;
                  basename->set(basenameStart, basenameLength);
                  return;
            }
        } while (i > 0);

        basename->set(path.c_str(), end + 1);
    }

    void setup_bitmap(SkBitmap* bitmap, int width, int height) {
        bitmap->setConfig(SkBitmap::kARGB_8888_Config, width, height);
        bitmap->allocPixels();
        bitmap->eraseColor(0);
    }

}