cfb972f944
- Overriding methods are clearly indicated with `override` keywords - Remove redundant `virtual` keywords from destructors of subclasses - Introduce `SPUnsupported()`, replacing most uses of `SPNotImplemented()`, which now serves as a dynamic "TODO" marker
92 lines
2.5 KiB
C++
92 lines
2.5 KiB
C++
/*
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Copyright (c) 2014 Marco Schlumpp <marco.schlumpp@gmail.com>
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This file is part of OpenSpades.
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OpenSpades is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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OpenSpades is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with OpenSpades. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <cstdint>
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#include <cstring>
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#include "Bitmap.h"
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#include "IBitmapCodec.h"
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#include "IStream.h"
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#include "pnglite.h"
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namespace {
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unsigned WriteCallback(void *input, std::size_t size, std::size_t numel, void *user_ptr) {
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auto stream = static_cast<spades::IStream *>(user_ptr);
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stream->Write(input, size * numel);
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return static_cast<unsigned>(size * numel);
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}
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}
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namespace spades {
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class PngWriter : public IBitmapCodec {
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public:
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PngWriter() : IBitmapCodec() { png_init(nullptr, nullptr); }
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bool CanLoad() override { return false; }
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bool CanSave() override { return true; }
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bool CheckExtension(const std::string &filename) override {
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return EndsWith(filename, ".png");
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}
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std::string GetName() override {
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static std::string name("libpng exporter");
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return name;
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}
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Bitmap *Load(IStream *str) override {
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SPADES_MARK_FUNCTION();
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SPUnreachable();
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}
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void Save(IStream *stream, Bitmap *bmp) override {
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SPADES_MARK_FUNCTION();
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int err;
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png_t png_s;
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if ((err = png_open_write(&png_s, &WriteCallback, stream))) {
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SPRaise("Error while png_open_write: %s", png_error_string(err));
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}
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// Create flipped buffer
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std::vector<std::uint8_t> buf(bmp->GetWidth() * bmp->GetHeight() * 4);
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{
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std::uint32_t *pixels = bmp->GetPixels();
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auto width = bmp->GetWidth();
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auto rowLengthBytes = width * sizeof(std::uint8_t) * 4;
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for (long y = bmp->GetHeight() - 1; y >= 0; --y) {
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std::memcpy(&buf[y * rowLengthBytes], pixels, rowLengthBytes);
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pixels += width;
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}
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}
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if ((err = png_set_data(&png_s, bmp->GetWidth(), bmp->GetHeight(), 8,
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PNG_TRUECOLOR_ALPHA, buf.data()))) {
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SPRaise("Error while png_set_data: %s", png_error_string(err));
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}
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}
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};
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static PngWriter sharedCodec;
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}
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