OpenShot Library | libopenshot
0.2.2
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28 #include "../../include/effects/ChromaKey.h"
38 init_effect_details();
47 init_effect_details();
51 void ChromaKey::init_effect_details()
58 info.
name =
"Chroma Key (Greenscreen)";
59 info.
description =
"Replaces the color (or chroma) of the frame with transparency (i.e. keys out the color).";
69 int threshold = fuzz.
GetInt(frame_number);
70 long mask_R = color.
red.
GetInt(frame_number);
75 std::shared_ptr<QImage> image = frame->GetImage();
76 unsigned char *pixels = (
unsigned char *) image->bits();
79 for (
int pixel = 0, byte_index=0; pixel < image->width() * image->height(); pixel++, byte_index+=4)
82 unsigned char R = pixels[byte_index];
83 unsigned char G = pixels[byte_index + 1];
84 unsigned char B = pixels[byte_index + 2];
85 unsigned char A = pixels[byte_index + 3];
91 if (distance <= threshold)
93 pixels[byte_index + 3] = 0;
126 bool success = reader.parse( value, root );
129 throw InvalidJSON(
"JSON could not be parsed (or is invalid)",
"");
139 throw InvalidJSON(
"JSON is invalid (missing keys or invalid data types)",
"");
150 if (!root[
"color"].isNull())
152 if (!root[
"fuzz"].isNull())
161 root[
"id"] =
add_property_json(
"ID", 0.0,
"string",
Id(), NULL, -1, -1,
true, requested_frame);
162 root[
"position"] =
add_property_json(
"Position",
Position(),
"float",
"", NULL, 0, 30 * 60 * 60 * 48,
false, requested_frame);
164 root[
"start"] =
add_property_json(
"Start",
Start(),
"float",
"", NULL, 0, 30 * 60 * 60 * 48,
false, requested_frame);
165 root[
"end"] =
add_property_json(
"End",
End(),
"float",
"", NULL, 0, 30 * 60 * 60 * 48,
false, requested_frame);
166 root[
"duration"] =
add_property_json(
"Duration",
Duration(),
"float",
"", NULL, 0, 30 * 60 * 60 * 48,
true, requested_frame);
169 root[
"color"] =
add_property_json(
"Key Color", 0.0,
"color",
"", NULL, 0, 255,
false, requested_frame);
173 root[
"fuzz"] =
add_property_json(
"Fuzz", fuzz.
GetValue(requested_frame),
"float",
"", &fuzz, 0, 25,
false, requested_frame);
176 return root.toStyledString();
Json::Value JsonValue()
Generate Json::JsonValue for this object.
EffectInfoStruct info
Information about the current effect.
void SetJson(string value)
Load JSON string into this object.
string Json()
Get and Set JSON methods.
Keyframe green
Curve representing the green value (0 - 255)
This namespace is the default namespace for all code in the openshot library.
float Start()
Get start position (in seconds) of clip (trim start of video)
string class_name
The class name of the effect.
void SetJsonValue(Json::Value root)
Load Json::JsonValue into this object.
int GetInt(int64_t index)
Get the rounded INT value at a specific index.
string Id()
Get basic properties.
Json::Value JsonValue()
Generate Json::JsonValue 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...
virtual Json::Value JsonValue()=0
Generate Json::JsonValue for this object.
Json::Value add_property_json(string name, float value, string type, string memo, Keyframe *keyframe, float min_value, float max_value, bool readonly, int64_t requested_frame)
Generate JSON for a property.
This class represents a color (used on the timeline and clips)
double GetValue(int64_t index)
Get the value at a specific index.
A Keyframe is a collection of Point instances, which is used to vary a number or property over time.
Exception for invalid JSON.
float Duration()
Get the length of this clip (in seconds)
void SetJsonValue(Json::Value root)
Load Json::JsonValue into this object.
bool has_audio
Determines if this effect manipulates the audio of a frame.
Keyframe blue
Curve representing the red value (0 - 255)
string description
The description of this effect and what it does.
Json::Value JsonValue()
Generate Json::JsonValue for this object.
string name
The name of the effect.
string PropertiesJSON(int64_t requested_frame)
virtual void SetJsonValue(Json::Value root)=0
Load Json::JsonValue into this object.
bool has_video
Determines if this effect manipulates the image of a frame.
float End()
Get end position (in seconds) of clip (trim end of video)
int Layer()
Get layer of clip on timeline (lower number is covered by higher numbers)
Keyframe red
Curve representing the red value (0 - 255)
void SetJsonValue(Json::Value root)
Load Json::JsonValue into this object.
float Position()
Get position on timeline (in seconds)
ChromaKey()
Blank constructor, useful when using Json to load the effect properties.
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...