OpenShot Library | libopenshot
0.2.5
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31 #include "../../include/effects/Brightness.h"
38 init_effect_details();
45 init_effect_details();
49 void Brightness::init_effect_details()
57 info.
description =
"Adjust the brightness and contrast of the frame's image.";
67 std::shared_ptr<QImage> frame_image = frame->
GetImage();
74 unsigned char *pixels = (
unsigned char *) frame_image->bits();
75 int pixel_count = frame_image->width() * frame_image->height();
77 #pragma omp parallel for
78 for (
int pixel = 0; pixel < pixel_count; ++pixel)
81 float factor = (259 * (contrast_value + 255)) / (255 * (259 - contrast_value));
84 int R =
constrain((factor * (pixels[pixel * 4] - 128)) + 128);
85 int G =
constrain((factor * (pixels[pixel * 4 + 1] - 128)) + 128);
86 int B =
constrain((factor * (pixels[pixel * 4 + 2] - 128)) + 128);
90 pixels[pixel * 4] =
constrain(R + (255 * brightness_value));
91 pixels[pixel * 4 + 1] =
constrain(G + (255 * brightness_value));
92 pixels[pixel * 4 + 2] =
constrain(B + (255 * brightness_value));
129 catch (
const std::exception& e)
132 throw InvalidJSON(
"JSON is invalid (missing keys or invalid data types)");
143 if (!root[
"brightness"].isNull())
145 if (!root[
"contrast"].isNull())
154 root[
"id"] =
add_property_json(
"ID", 0.0,
"string",
Id(), NULL, -1, -1,
true, requested_frame);
155 root[
"position"] =
add_property_json(
"Position", Position(),
"float",
"", NULL, 0, 30 * 60 * 60 * 48,
false, requested_frame);
156 root[
"layer"] =
add_property_json(
"Track", Layer(),
"int",
"", NULL, 0, 20,
false, requested_frame);
157 root[
"start"] =
add_property_json(
"Start", Start(),
"float",
"", NULL, 0, 30 * 60 * 60 * 48,
false, requested_frame);
158 root[
"end"] =
add_property_json(
"End", End(),
"float",
"", NULL, 0, 30 * 60 * 60 * 48,
false, requested_frame);
159 root[
"duration"] =
add_property_json(
"Duration", Duration(),
"float",
"", NULL, 0, 30 * 60 * 60 * 48,
true, requested_frame);
166 return root.toStyledString();
std::string PropertiesJSON(int64_t requested_frame) const override
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.
void SetJsonValue(const Json::Value root)
Load Json::Value into this object.
void SetJson(const std::string value)
Load JSON string into this object.
This namespace is the default namespace for all code in the openshot library.
std::string Json() const override
Get and Set JSON methods.
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...
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.
Keyframe brightness
Brightness keyframe. A constant value here will prevent animation.
Json::Value JsonValue() const
Generate Json::Value for this object.
A Keyframe is a collection of Point instances, which is used to vary a number or property over time.
Exception for invalid JSON.
Json::Value JsonValue() const override
Generate Json::Value for this object.
bool has_audio
Determines if this effect manipulates the audio of a frame.
std::string class_name
The class name of the effect.
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.
Brightness()
Blank constructor, useful when using Json to load the effect properties.
void Id(std::string value)
Set basic properties.
std::shared_ptr< QImage > GetImage()
Get pointer to Qt QImage image object.
int constrain(int color_value)
Constrain a color value from 0 to 255.
std::string name
The name of the effect.
Keyframe contrast
Contrast keyframe.
double GetValue(int64_t index) const
Get the value at a specific index.