OpenShot Library | libopenshot
0.2.5
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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);
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.
float End() const
Get end position (in seconds) of clip (trim end of video)
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...
int Layer() const
Get layer of clip on timeline (lower number is covered by higher numbers)
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)
std::string Id() const
Get basic properties.
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.
float Duration() const
Get the length of this clip (in seconds)
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.
std::shared_ptr< QImage > GetImage()
Get pointer to Qt QImage image object.
float Position() const
Get position on timeline (in seconds)
std::string name
The name of the effect.
float Start() const
Get start position (in seconds) of clip (trim start of video)
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.