OpenShot Library | libopenshot
0.2.5
|
Go to the documentation of this file.
31 #include "../../include/effects/ChromaKey.h"
41 init_effect_details();
50 init_effect_details();
54 void ChromaKey::init_effect_details()
61 info.
name =
"Chroma Key (Greenscreen)";
62 info.
description =
"Replaces the color (or chroma) of the frame with transparency (i.e. keys out the color).";
72 int threshold = fuzz.
GetInt(frame_number);
73 long mask_R = color.
red.
GetInt(frame_number);
78 std::shared_ptr<QImage> image = frame->
GetImage();
79 unsigned char *pixels = (
unsigned char *) image->bits();
82 for (
int pixel = 0, byte_index=0; pixel < image->width() * image->height(); pixel++, byte_index+=4)
85 unsigned char R = pixels[byte_index];
86 unsigned char G = pixels[byte_index + 1];
87 unsigned char B = pixels[byte_index + 2];
88 unsigned char A = pixels[byte_index + 3];
94 if (distance <= threshold)
96 pixels[byte_index + 3] = 0;
133 catch (
const std::exception& e)
136 throw InvalidJSON(
"JSON is invalid (missing keys or invalid data types)");
147 if (!root[
"color"].isNull())
149 if (!root[
"fuzz"].isNull())
158 root[
"id"] =
add_property_json(
"ID", 0.0,
"string",
Id(), NULL, -1, -1,
true, requested_frame);
159 root[
"position"] =
add_property_json(
"Position", Position(),
"float",
"", NULL, 0, 30 * 60 * 60 * 48,
false, requested_frame);
160 root[
"layer"] =
add_property_json(
"Track", Layer(),
"int",
"", NULL, 0, 20,
false, requested_frame);
161 root[
"start"] =
add_property_json(
"Start", Start(),
"float",
"", NULL, 0, 30 * 60 * 60 * 48,
false, requested_frame);
162 root[
"end"] =
add_property_json(
"End", End(),
"float",
"", NULL, 0, 30 * 60 * 60 * 48,
false, requested_frame);
163 root[
"duration"] =
add_property_json(
"Duration", Duration(),
"float",
"", NULL, 0, 30 * 60 * 60 * 48,
true, requested_frame);
166 root[
"color"] =
add_property_json(
"Key Color", 0.0,
"color",
"", NULL, 0, 255,
false, requested_frame);
170 root[
"fuzz"] =
add_property_json(
"Fuzz", fuzz.
GetValue(requested_frame),
"float",
"", &fuzz, 0, 25,
false, requested_frame);
173 return root.toStyledString();
Json::Value add_property_json(std::string name, float value, std::string type, std::string memo, const Keyframe *keyframe, float min_value, float max_value, bool readonly, int64_t requested_frame) const
Generate JSON for a property.
const Json::Value stringToJson(const std::string value)
EffectInfoStruct info
Information about the current effect.
This namespace is the default namespace for all code in the openshot library.
void SetJsonValue(const Json::Value root)
Load Json::Value into this object.
virtual void SetJsonValue(const Json::Value root)=0
Load Json::Value into this object.
virtual Json::Value JsonValue() const =0
Generate Json::Value for this object.
static long GetDistance(long R1, long G1, long B1, long R2, long G2, long B2)
Get the distance between 2 RGB pairs. (0=identical colors, 10=very close colors, 760=very different c...
void SetJsonValue(const Json::Value root)
Load Json::Value into this object.
Json::Value JsonValue() const
Generate Json::Value for this object.
This class represents a color (used on the timeline and clips)
A Keyframe is a collection of Point instances, which is used to vary a number or property over time.
void SetJsonValue(const Json::Value root)
Load Json::Value into this object.
Exception for invalid JSON.
openshot::Keyframe green
Curve representing the green value (0 - 255)
bool has_audio
Determines if this effect manipulates the audio of a frame.
Json::Value JsonValue() const override
Generate Json::Value for this object.
void SetJson(const std::string value)
Load JSON string into this object.
std::string class_name
The class name of the effect.
Json::Value JsonValue() const
Generate Json::Value for this object.
int GetInt(int64_t index) const
Get the rounded INT value at a specific index.
std::string description
The description of this effect and what it does.
bool has_video
Determines if this effect manipulates the image of a frame.
void Id(std::string value)
Set basic properties.
std::shared_ptr< QImage > GetImage()
Get pointer to Qt QImage image object.
std::string name
The name of the effect.
openshot::Keyframe red
Curve representing the red value (0 - 255)
std::string Json() const override
Get and Set JSON methods.
openshot::Keyframe blue
Curve representing the red value (0 - 255)
ChromaKey()
Blank constructor, useful when using Json to load the effect properties.
std::string PropertiesJSON(int64_t requested_frame) const override
std::shared_ptr< Frame > GetFrame(std::shared_ptr< Frame > frame, int64_t frame_number)
This method is required for all derived classes of EffectBase, and returns a modified openshot::Frame...
double GetValue(int64_t index) const
Get the value at a specific index.