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/***
Olive - Non-Linear Video Editor
Copyright (C) 2019 Olive Team
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
***/
#include "text.h"
#include <QTextDocument>
OLIVE_NAMESPACE_ENTER
enum TextVerticalAlign {
kVerticalAlignTop,
kVerticalAlignCenter,
kVerticalAlignBottom,
};
TextGenerator::TextGenerator()
{
text_input_ = new NodeInput(QStringLiteral("text_in"),
NodeParam::kText,
tr("Sample Text"));
AddInput(text_input_);
color_input_ = new NodeInput(QStringLiteral("color_in"),
NodeParam::kColor,
QVariant::fromValue(Color(1.0f, 1.0f, 1.0)));
AddInput(color_input_);
valign_input_ = new NodeInput(QStringLiteral("valign_in"),
NodeParam::kCombo,
1);
AddInput(valign_input_);
font_input_ = new NodeInput(QStringLiteral("font_in"),
NodeParam::kFont);
AddInput(font_input_);
font_size_input_ = new NodeInput(QStringLiteral("font_size_in"),
NodeParam::kFloat,
72.0f);
AddInput(font_size_input_);
}
Node *TextGenerator::copy() const
{
return new TextGenerator();
}
QString TextGenerator::Name() const
{
return tr("Text");
}
QString TextGenerator::id() const
{
return QStringLiteral("org.olivevideoeditor.Olive.textgenerator");
}
QList<Node::CategoryID> TextGenerator::Category() const
{
return {kCategoryGenerator};
}
QString TextGenerator::Description() const
{
return tr("Generate rich text.");
}
void TextGenerator::Retranslate()
{
text_input_->set_name(tr("Text"));
font_input_->set_name(tr("Font"));
font_size_input_->set_name(tr("Font Size"));
color_input_->set_name(tr("Color"));
valign_input_->set_name(tr("Vertical Align"));
valign_input_->set_combobox_strings({tr("Top"), tr("Center"), tr("Bottom")});
}
NodeValueTable TextGenerator::Value(NodeValueDatabase &value) const
{
GenerateJob job;
job.InsertValue(text_input_, value);
job.InsertValue(color_input_, value);
job.InsertValue(valign_input_, value);
job.InsertValue(font_input_, value);
job.InsertValue(font_size_input_, value);
job.SetAlphaChannelRequired(true);
NodeValueTable table = value.Merge();
if (!job.GetValue(text_input_).data().toString().isEmpty()) {
table.Push(NodeParam::kGenerateJob, QVariant::fromValue(job), this);
}
return table;
}
void TextGenerator::GenerateFrame(FramePtr frame, const GenerateJob& job) const
{
// This could probably be more optimized, but for now we use Qt to draw to a QImage.
// QImages only support integer pixels and we use float pixels, so what we do here is draw onto
// a single-channel QImage (alpha only) and then transplant that alpha channel to our float buffer
// with correct float RGB.
QImage img(frame->width(), frame->height(), QImage::Format_Grayscale8);
img.fill(0);
QTextDocument text_doc;
// Set default font
QFont default_font;
default_font.setFamily(job.GetValue(font_input_).data().toString());
default_font.setPointSizeF(job.GetValue(font_size_input_).data().toFloat());
text_doc.setDefaultFont(default_font);
// Center by default
text_doc.setDefaultTextOption(QTextOption(Qt::AlignCenter));
text_doc.setHtml(job.GetValue(text_input_).data().toString());
// Align to 80% width because that's considered the "title safe" area
int tenth_of_width = frame->video_params().width() / 10;
text_doc.setTextWidth(tenth_of_width * 8);
// Draw rich text onto image
QPainter p(&img);
p.scale(1.0 / frame->video_params().divider(), 1.0 / frame->video_params().divider());
// Push 10% inwards to compensate for title safe area
p.translate(tenth_of_width, 0);
TextVerticalAlign valign = static_cast<TextVerticalAlign>(job.GetValue(valign_input_).data().toInt());
int doc_height = text_doc.size().height();
switch (valign) {
case kVerticalAlignTop:
// Push 10% inwards for title safe area
p.translate(0, frame->video_params().height() / 10);
break;
case kVerticalAlignCenter:
// Center align
p.translate(0, frame->video_params().height() / 2 - doc_height / 2);
break;
case kVerticalAlignBottom:
// Push 10% inwards for title safe area
p.translate(0, frame->video_params().height() - doc_height - frame->video_params().height() / 10);
break;
}
text_doc.drawContents(&p);
// Transplant alpha channel to frame
Color rgb = job.GetValue(color_input_).data().value<Color>();
for (int x=0; x<frame->width(); x++) {
for (int y=0; y<frame->height(); y++) {
uchar src_alpha = img.bits()[img.bytesPerLine() * y + x];
float alpha = float(src_alpha) / 255.0f;
frame->set_pixel(x, y, Color(rgb.red() * alpha, rgb.green() * alpha, rgb.blue() * alpha, alpha));
}
}
}
OLIVE_NAMESPACE_EXIT
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