gm/imageresizetiled.cpp

/*
 * Copyright 2014 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#include "gm/gm.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkFont.h"
#include "include/core/SkImageFilter.h"
#include "include/core/SkMatrix.h"
#include "include/core/SkPaint.h"
#include "include/core/SkRect.h"
#include "include/core/SkScalar.h"
#include "include/core/SkTypeface.h"
#include "include/core/SkTypes.h"
#include "include/effects/SkImageFilters.h"
#include "tools/ToolUtils.h"
#include "tools/fonts/FontToolUtils.h"

#include <array>

#define WIDTH 640
#define HEIGHT 480

#define RESIZE_FACTOR SkIntToScalar(2)

DEF_SIMPLE_GM(imageresizetiled, canvas, WIDTH, HEIGHT) {
        SkPaint paint;
        SkMatrix matrix;
        matrix.setScale(RESIZE_FACTOR, RESIZE_FACTOR);
        paint.setImageFilter(SkImageFilters::MatrixTransform(matrix,
                                                             SkSamplingOptions(),
                                                             nullptr));

        SkFont         font(ToolUtils::DefaultPortableTypeface(), 100);
        const SkScalar tile_size = SkIntToScalar(100);
        for (SkScalar y = 0; y < HEIGHT; y += tile_size) {
            for (SkScalar x = 0; x < WIDTH; x += tile_size) {
                canvas->save();
                canvas->clipRect(SkRect::MakeXYWH(x, y, tile_size, tile_size));
                canvas->scale(SkScalarInvert(RESIZE_FACTOR),
                              SkScalarInvert(RESIZE_FACTOR));
                canvas->saveLayer(nullptr, &paint);
                static constexpr auto str = std::to_array<const char*>({
                        "The quick",
                        "brown fox",
                        "jumped over",
                        "the lazy dog.",
                });
                float posY = 0;
                for (unsigned i = 0; i < std::size(str); i++) {
                    posY += 100.0f;
                    canvas->drawString(str[i], 0.0f, posY, font, SkPaint());
                }
                canvas->restore();
                canvas->restore();
            }
        }
}