120 lines
3.4 KiB
C++
120 lines
3.4 KiB
C++
/***
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Olive - Non-Linear Video Editor
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Copyright (C) 2019 Olive Team
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This program 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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This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
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***/
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#include "text.h"
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#include <QTextDocument>
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OLIVE_NAMESPACE_ENTER
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TextGenerator::TextGenerator()
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{
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QString default_str = QStringLiteral("<html><div style='font-size:144pt; text-align: center;'>%1</div></html>").arg(tr("Sample Text"));
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text_input_ = new NodeInput(QStringLiteral("text_in"),
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NodeParam::kText,
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default_str);
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AddInput(text_input_);
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color_input_ = new NodeInput(QStringLiteral("color_in"),
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NodeParam::kColor,
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QVariant::fromValue(Color(1.0f, 1.0f, 1.0)));
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AddInput(color_input_);
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}
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Node *TextGenerator::copy() const
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{
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return new TextGenerator();
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}
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QString TextGenerator::Name() const
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{
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return tr("Text");
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}
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QString TextGenerator::id() const
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{
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return QStringLiteral("org.olivevideoeditor.Olive.textgenerator");
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}
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QList<Node::CategoryID> TextGenerator::Category() const
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{
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return {kCategoryGenerator};
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}
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QString TextGenerator::Description() const
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{
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return tr("Generate rich text.");
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}
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void TextGenerator::Retranslate()
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{
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text_input_->set_name(tr("Text"));
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color_input_->set_name(tr("Color"));
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}
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NodeValueTable TextGenerator::Value(NodeValueDatabase &value) const
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{
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GenerateJob job;
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job.InsertValue(text_input_, value);
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job.InsertValue(color_input_, value);
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job.SetAlphaChannelRequired(true);
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NodeValueTable table = value.Merge();
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if (!job.GetValue(text_input_).data().toString().isEmpty()) {
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table.Push(NodeParam::kGenerateJob, QVariant::fromValue(job), this);
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}
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return table;
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}
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void TextGenerator::GenerateFrame(FramePtr frame, const GenerateJob& job) const
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{
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// This could probably be more optimized, but for now we use Qt to draw to a QImage.
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// QImages only support integer pixels and we use float pixels, so what we do here is draw onto
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// a single-channel QImage (alpha only) and then transplant that alpha channel to our float buffer
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// with correct float RGB.
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QImage img(frame->width(), frame->height(), QImage::Format_Grayscale8);
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img.fill(0);
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QTextDocument text_doc;
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text_doc.setHtml(job.GetValue(text_input_).data().toString());
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text_doc.setTextWidth(frame->video_params().width());
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// Draw rich text onto image
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QPainter p(&img);
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p.scale(1.0 / frame->video_params().divider(), 1.0 / frame->video_params().divider());
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text_doc.drawContents(&p);
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// Transplant alpha channel to frame
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Color rgb = job.GetValue(color_input_).data().value<Color>();
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for (int x=0; x<frame->width(); x++) {
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for (int y=0; y<frame->height(); y++) {
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uchar src_alpha = img.bits()[img.bytesPerLine() * y + x];
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float alpha = float(src_alpha) / 255.0f;
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frame->set_pixel(x, y, Color(rgb.red() * alpha, rgb.green() * alpha, rgb.blue() * alpha, alpha));
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}
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}
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}
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OLIVE_NAMESPACE_EXIT
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