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QtHtmlReader.cpp
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// Copyright (c) 2008-2019 OpenShot Studios, LLC
//
// SPDX-License-Identifier: LGPL-3.0-or-later
#include "QtHtmlReader.h"
#include "Exceptions.h"
#include "Frame.h"
#include <QImage>
#include <QPainter>
#include <QTextDocument>
#include <QGuiApplication>
#include <QAbstractTextDocumentLayout>
using namespace openshot;
QtHtmlReader::QtHtmlReader() : width(1024), height(768), x_offset(0), y_offset(0), html(""), css(""), background_color("#000000"), is_open(false), gravity(GRAVITY_CENTER)
{
// Open and Close the reader, to populate it's attributes (such as height, width, etc...)
Open();
Close();
}
QtHtmlReader::QtHtmlReader(int width, int height, int x_offset, int y_offset, GravityType gravity, std::string html, std::string css, std::string background_color)
: width(width), height(height), x_offset(x_offset), y_offset(y_offset), gravity(gravity), html(html), css(css), background_color(background_color), is_open(false)
{
// Open and Close the reader, to populate it's attributes (such as height, width, etc...)
Open();
Close();
}
// Open reader
void QtHtmlReader::Open()
{
// Open reader if not already open
if (!is_open)
{
// create image
image = std::make_shared<QImage>(width, height, QImage::Format_RGBA8888_Premultiplied);
image->fill(QColor(background_color.c_str()));
//start painting
QPainter painter;
if (!painter.begin(image.get())) {
return;
}
//set background
painter.setBackground(QBrush(background_color.c_str()));
//draw text
QTextDocument text_document;
//disable redo/undo stack as not needed
text_document.setUndoRedoEnabled(false);
//create the HTML/CSS document
text_document.setTextWidth(width);
text_document.setDefaultStyleSheet(css.c_str());
text_document.setHtml(html.c_str());
int td_height = text_document.documentLayout()->documentSize().height();
if (gravity == GRAVITY_TOP_LEFT || gravity == GRAVITY_TOP || gravity == GRAVITY_TOP_RIGHT) {
painter.translate(x_offset, y_offset);
} else if (gravity == GRAVITY_LEFT || gravity == GRAVITY_CENTER || gravity == GRAVITY_RIGHT) {
painter.translate(x_offset, (height - td_height) / 2 + y_offset);
} else if (gravity == GRAVITY_BOTTOM_LEFT || gravity == GRAVITY_BOTTOM_RIGHT || gravity == GRAVITY_BOTTOM) {
painter.translate(x_offset, height - td_height + y_offset);
}
if (gravity == GRAVITY_TOP_LEFT || gravity == GRAVITY_LEFT || gravity == GRAVITY_BOTTOM_LEFT) {
text_document.setDefaultTextOption(QTextOption(Qt::AlignLeft));
} else if (gravity == GRAVITY_CENTER || gravity == GRAVITY_TOP || gravity == GRAVITY_BOTTOM) {
text_document.setDefaultTextOption(QTextOption(Qt::AlignHCenter));
} else if (gravity == GRAVITY_TOP_RIGHT || gravity == GRAVITY_RIGHT|| gravity == GRAVITY_BOTTOM_RIGHT) {
text_document.setDefaultTextOption(QTextOption(Qt::AlignRight));
}
// Draw image
text_document.drawContents(&painter);
painter.end();
// Update image properties
info.has_audio = false;
info.has_video = true;
info.file_size = 0;
info.vcodec = "QImage";
info.width = width;
info.height = height;
info.pixel_ratio.num = 1;
info.pixel_ratio.den = 1;
info.duration = 60 * 60 * 1; // 1 hour duration
info.fps.num = 30;
info.fps.den = 1;
info.video_timebase.num = 1;
info.video_timebase.den = 30;
info.video_length = round(info.duration * info.fps.ToDouble());
// Calculate the DAR (display aspect ratio)
Fraction size(info.width * info.pixel_ratio.num, info.height * info.pixel_ratio.den);
// Reduce size fraction
size.Reduce();
// Set the ratio based on the reduced fraction
info.display_ratio.num = size.num;
info.display_ratio.den = size.den;
// Mark as "open"
is_open = true;
}
}
// Close reader
void QtHtmlReader::Close()
{
// Close all objects, if reader is 'open'
if (is_open)
{
// Mark as "closed"
is_open = false;
// Delete the image
image.reset();
info.vcodec = "";
info.acodec = "";
}
}
// Get an openshot::Frame object for a specific frame number of this reader.
std::shared_ptr<Frame> QtHtmlReader::GetFrame(int64_t requested_frame)
{
if (image)
{
// Create or get frame object
auto image_frame = std::make_shared<Frame>(
requested_frame, image->size().width(), image->size().height(),
background_color, 0, 2);
// Add Image data to frame
image_frame->AddImage(image);
// return frame object
return image_frame;
} else {
// return empty frame
auto image_frame = std::make_shared<Frame>(
1, 640, 480, background_color, 0, 2);
// return frame object
return image_frame;
}
}
// Generate JSON string of this object
std::string QtHtmlReader::Json() const {
// Return formatted string
return JsonValue().toStyledString();
}
// Generate Json::Value for this object
Json::Value QtHtmlReader::JsonValue() const {
// Create root json object
Json::Value root = ReaderBase::JsonValue(); // get parent properties
root["type"] = "QtHtmlReader";
root["width"] = width;
root["height"] = height;
root["x_offset"] = x_offset;
root["y_offset"] = y_offset;
root["html"] = html;
root["css"] = css;
root["background_color"] = background_color;
root["gravity"] = gravity;
// return JsonValue
return root;
}
// Load JSON string into this object
void QtHtmlReader::SetJson(const std::string value) {
// Parse JSON string into JSON objects
try
{
const Json::Value root = openshot::stringToJson(value);
// Set all values that match
SetJsonValue(root);
}
catch (const std::exception& e)
{
// Error parsing JSON (or missing keys)
throw InvalidJSON("JSON is invalid (missing keys or invalid data types)");
}
}
// Load Json::Value into this object
void QtHtmlReader::SetJsonValue(const Json::Value root) {
// Set parent data
ReaderBase::SetJsonValue(root);
// Set data from Json (if key is found)
if (!root["width"].isNull())
width = root["width"].asInt();
if (!root["height"].isNull())
height = root["height"].asInt();
if (!root["x_offset"].isNull())
x_offset = root["x_offset"].asInt();
if (!root["y_offset"].isNull())
y_offset = root["y_offset"].asInt();
if (!root["html"].isNull())
html = root["html"].asString();
if (!root["css"].isNull())
css = root["css"].asString();
if (!root["background_color"].isNull())
background_color = root["background_color"].asString();
if (!root["gravity"].isNull())
gravity = (GravityType) root["gravity"].asInt();
// Re-Open path, and re-init everything (if needed)
if (is_open)
{
Close();
Open();
}
}
Exceptions.h
Header file for all Exception classes.
Frame.h
Header file for Frame class.
QtHtmlReader.h
Header file for QtHtmlReader class.
openshot::Fraction
This class represents a fraction.
Definition Fraction.h:30
openshot::Fraction::num
int num
Numerator for the fraction.
Definition Fraction.h:32
openshot::Fraction::ToDouble
double ToDouble() const
Return this fraction as a double (i.e. 1/2 = 0.5)
Definition Fraction.cpp:40
openshot::Fraction::Reduce
void Reduce()
Reduce this fraction (i.e. 640/480 = 4/3)
Definition Fraction.cpp:65
openshot::Fraction::den
int den
Denominator for the fraction.
Definition Fraction.h:33
openshot::InvalidJSON
Exception for invalid JSON.
Definition Exceptions.h:218
openshot::QtHtmlReader::SetJsonValue
void SetJsonValue(const Json::Value root) override
Load Json::Value into this object.
Definition QtHtmlReader.cpp:214
openshot::QtHtmlReader::GetFrame
std::shared_ptr< openshot::Frame > GetFrame(int64_t requested_frame) override
Definition QtHtmlReader.cpp:145
openshot::QtHtmlReader::JsonValue
Json::Value JsonValue() const override
Generate Json::Value for this object.
Definition QtHtmlReader.cpp:178
openshot::QtHtmlReader::Json
std::string Json() const override
Generate JSON string of this object.
Definition QtHtmlReader.cpp:171
openshot::QtHtmlReader::Close
void Close() override
Close Reader.
Definition QtHtmlReader.cpp:128
openshot::QtHtmlReader::QtHtmlReader
QtHtmlReader()
Default constructor (blank text)
Definition QtHtmlReader.cpp:28
openshot::QtHtmlReader::Open
void Open() override
Open Reader - which is called by the constructor automatically.
Definition QtHtmlReader.cpp:44
openshot::QtHtmlReader::SetJson
void SetJson(const std::string value) override
Load JSON string into this object.
Definition QtHtmlReader.cpp:197
openshot::ReaderBase::info
openshot::ReaderInfo info
Information about the current media file.
Definition ReaderBase.h:88
openshot::ReaderBase::SetJsonValue
virtual void SetJsonValue(const Json::Value root)=0
Load Json::Value into this object.
Definition ReaderBase.cpp:162
openshot::ReaderBase::JsonValue
virtual Json::Value JsonValue() const =0
Generate Json::Value for this object.
Definition ReaderBase.cpp:107
openshot
This namespace is the default namespace for all code in the openshot library.
Definition Compressor.h:29
openshot::GravityType
GravityType
This enumeration determines how clips are aligned to their parent container.
Definition Enums.h:22
openshot::GRAVITY_TOP_LEFT
@ GRAVITY_TOP_LEFT
Align clip to the top left of its parent.
Definition Enums.h:23
openshot::GRAVITY_LEFT
@ GRAVITY_LEFT
Align clip to the left of its parent (middle aligned)
Definition Enums.h:26
openshot::GRAVITY_TOP_RIGHT
@ GRAVITY_TOP_RIGHT
Align clip to the top right of its parent.
Definition Enums.h:25
openshot::GRAVITY_RIGHT
@ GRAVITY_RIGHT
Align clip to the right of its parent (middle aligned)
Definition Enums.h:28
openshot::GRAVITY_BOTTOM_LEFT
@ GRAVITY_BOTTOM_LEFT
Align clip to the bottom left of its parent.
Definition Enums.h:29
openshot::GRAVITY_BOTTOM
@ GRAVITY_BOTTOM
Align clip to the bottom center of its parent.
Definition Enums.h:30
openshot::GRAVITY_TOP
@ GRAVITY_TOP
Align clip to the top center of its parent.
Definition Enums.h:24
openshot::GRAVITY_BOTTOM_RIGHT
@ GRAVITY_BOTTOM_RIGHT
Align clip to the bottom right of its parent.
Definition Enums.h:31
openshot::GRAVITY_CENTER
@ GRAVITY_CENTER
Align clip to the center of its parent (middle aligned)
Definition Enums.h:27
openshot::stringToJson
const Json::Value stringToJson(const std::string value)
Definition Json.cpp:16
openshot::ReaderInfo::duration
float duration
Length of time (in seconds)
Definition ReaderBase.h:43
openshot::ReaderInfo::width
int width
The width of the video (in pixesl)
Definition ReaderBase.h:46
openshot::ReaderInfo::fps
openshot::Fraction fps
Frames per second, as a fraction (i.e. 24/1 = 24 fps)
Definition ReaderBase.h:48
openshot::ReaderInfo::display_ratio
openshot::Fraction display_ratio
The ratio of width to height of the video stream (i.e. 640x480 has a ratio of 4/3)
Definition ReaderBase.h:51
openshot::ReaderInfo::height
int height
The height of the video (in pixels)
Definition ReaderBase.h:45
openshot::ReaderInfo::video_length
int64_t video_length
The number of frames in the video stream.
Definition ReaderBase.h:53
openshot::ReaderInfo::acodec
std::string acodec
The name of the audio codec used to encode / decode the video stream.
Definition ReaderBase.h:58
openshot::ReaderInfo::vcodec
std::string vcodec
The name of the video codec used to encode / decode the video stream.
Definition ReaderBase.h:52
openshot::ReaderInfo::pixel_ratio
openshot::Fraction pixel_ratio
The pixel ratio of the video stream as a fraction (i.e. some pixels are not square)
Definition ReaderBase.h:50
openshot::ReaderInfo::has_video
bool has_video
Determines if this file has a video stream.
Definition ReaderBase.h:40
openshot::ReaderInfo::has_audio
bool has_audio
Determines if this file has an audio stream.
Definition ReaderBase.h:41
openshot::ReaderInfo::video_timebase
openshot::Fraction video_timebase
The video timebase determines how long each frame stays on the screen.
Definition ReaderBase.h:55
openshot::ReaderInfo::file_size
int64_t file_size
Size of file (in bytes)
Definition ReaderBase.h:44