text_to_img.cpp

// 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 "skia.h"
#include "SkShaper.h"
#include <iostream>
#include <string>
int main() {
    constexpr int kWidth = 1080;
    constexpr int kXMargin = 40;
    constexpr int kYMargin = 40;
    constexpr char kFileName[] = "text_to_img.png";
    constexpr char kFamilyName[] = "DejaVuSerif";
    constexpr int kFontWeight = SkFontStyle::kNormal_Weight;
    constexpr int kFontWidth = SkFontStyle::kNormal_Width;
    constexpr SkFontStyle::Slant kFontSlant = SkFontStyle::kUpright_Slant;
    constexpr float kTextSize = 64;

    SkFont font(SkTypeface::MakeFromName(kFamilyName,
                SkFontStyle(kFontWeight, kFontWidth, kFontSlant)), kTextSize);
    SkShaper shaper(font.refTypeface());
    SkTextBlobBuilderLineHandler handler;
    SkPoint point{0, 0};
    for (std::string line; std::getline(std::cin, line);) {
        line += ' ';
        point = shaper.shape(&handler, font, line.c_str(), line.size(),
                             true, point, kWidth - 2 * kXMargin);
    }
    SkBitmap bitmap;
    bitmap.allocN32Pixels(kWidth, point.y() + 2 * kYMargin);
    bitmap.eraseColor(SK_ColorWHITE);
    SkCanvas(bitmap).drawTextBlob(handler.makeBlob(), kXMargin, kYMargin, SkPaint());
    SkFILEWStream dst(kFileName);
    SkEncodeImage(&dst, bitmap, SkEncodedImageFormat::kPNG, 100);
}