OpenShot Library | libopenshot
0.2.2
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28 #include "../../include/effects/Brightness.h"
35 init_effect_details();
42 init_effect_details();
46 void Brightness::init_effect_details()
54 info.
description =
"Adjust the brightness and contrast of the frame's image.";
64 std::shared_ptr<QImage> frame_image = frame->GetImage();
71 unsigned char *pixels = (
unsigned char *) frame_image->bits();
72 for (
int pixel = 0, byte_index=0; pixel < frame_image->width() * frame_image->height(); pixel++, byte_index+=4)
75 int R = pixels[byte_index];
76 int G = pixels[byte_index + 1];
77 int B = pixels[byte_index + 2];
78 int A = pixels[byte_index + 3];
81 float factor = (259 * (contrast_value + 255)) / (255 * (259 - contrast_value));
82 R =
constrain((factor * (R - 128)) + 128);
83 G =
constrain((factor * (G - 128)) + 128);
84 B =
constrain((factor * (B - 128)) + 128);
87 R += (255 * brightness_value);
88 G += (255 * brightness_value);
89 B += (255 * brightness_value);
97 pixels[byte_index] = R;
98 pixels[byte_index + 1] = G;
99 pixels[byte_index + 2] = B;
100 pixels[byte_index + 3] = A;
133 bool success = reader.parse( value, root );
136 throw InvalidJSON(
"JSON could not be parsed (or is invalid)",
"");
146 throw InvalidJSON(
"JSON is invalid (missing keys or invalid data types)",
"");
157 if (!root[
"brightness"].isNull())
159 if (!root[
"contrast"].isNull())
168 root[
"id"] =
add_property_json(
"ID", 0.0,
"string",
Id(), NULL, -1, -1,
true, requested_frame);
169 root[
"position"] =
add_property_json(
"Position",
Position(),
"float",
"", NULL, 0, 30 * 60 * 60 * 48,
false, requested_frame);
171 root[
"start"] =
add_property_json(
"Start",
Start(),
"float",
"", NULL, 0, 30 * 60 * 60 * 48,
false, requested_frame);
172 root[
"end"] =
add_property_json(
"End",
End(),
"float",
"", NULL, 0, 30 * 60 * 60 * 48,
false, requested_frame);
173 root[
"duration"] =
add_property_json(
"Duration",
Duration(),
"float",
"", NULL, 0, 30 * 60 * 60 * 48,
true, requested_frame);
180 return root.toStyledString();
EffectInfoStruct info
Information about the current effect.
void SetJson(string value)
Load JSON string into this object.
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)
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...
string class_name
The class name of the effect.
string Id()
Get basic properties.
virtual Json::Value JsonValue()=0
Generate Json::JsonValue for this object.
Keyframe brightness
Brightness keyframe. A constant value here will prevent animation.
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.
string PropertiesJSON(int64_t requested_frame)
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.
string Json()
Get and Set JSON methods.
Exception for invalid JSON.
float Duration()
Get the length of this clip (in seconds)
bool has_audio
Determines if this effect manipulates the audio of a frame.
string description
The description of this effect and what it does.
Json::Value JsonValue()
Generate Json::JsonValue for this object.
Json::Value JsonValue()
Generate Json::JsonValue for this object.
string name
The name of the effect.
void SetJsonValue(Json::Value root)
Load Json::JsonValue into this object.
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)
Brightness()
Blank constructor, useful when using Json to load the effect properties.
int Layer()
Get layer of clip on timeline (lower number is covered by higher numbers)
int constrain(int color_value)
Constrain a color value from 0 to 255.
Keyframe contrast
Contrast keyframe.
void SetJsonValue(Json::Value root)
Load Json::JsonValue into this object.
float Position()
Get position on timeline (in seconds)