This method is required for all derived classes of EffectBase, and returns a modified openshot::Frame object
| 47 | // This method is required for all derived classes of EffectBase, and returns a |
| 48 | // modified openshot::Frame object |
| 49 | std::shared_ptr<openshot::Frame> Wave::GetFrame(std::shared_ptr<openshot::Frame> frame, int64_t frame_number) |
| 50 | { |
| 51 | // Get the frame's image |
| 52 | std::shared_ptr<QImage> frame_image = frame->GetImage(); |
| 53 | |
| 54 | // Copy original pixels for reference, and get a writable pointer for editing |
| 55 | QImage original = frame_image->copy(); |
| 56 | const unsigned char *original_pixels = original.constBits(); |
| 57 | unsigned char *pixels = frame_image->bits(); |
| 58 | int pixel_count = frame_image->width() * frame_image->height(); |
| 59 | |
| 60 | // Get current keyframe values |
| 61 | double time = frame_number; |
| 62 | double wavelength_value = wavelength.GetValue(frame_number); |
| 63 | double amplitude_value = amplitude.GetValue(frame_number); |
| 64 | double multiplier_value = multiplier.GetValue(frame_number); |
| 65 | double shift_x_value = shift_x.GetValue(frame_number); |
| 66 | double speed_y_value = speed_y.GetValue(frame_number); |
| 67 | |
| 68 | // Loop through pixels |
| 69 | #pragma omp parallel for |
| 70 | for (int pixel = 0; pixel < pixel_count; ++pixel) |
| 71 | { |
| 72 | // Calculate pixel Y value |
| 73 | int Y = pixel / frame_image->width(); |
| 74 | |
| 75 | // Calculate wave pixel offsets |
| 76 | float noiseVal = (100 + Y * 0.001) * multiplier_value; // Time and time multiplier (to make the wave move) |
| 77 | float noiseAmp = noiseVal * amplitude_value; // Apply amplitude / height of the wave |
| 78 | float waveformVal = sin((Y * wavelength_value) + (time * speed_y_value)); // Waveform algorithm on y-axis |
| 79 | float waveVal = (waveformVal + shift_x_value) * noiseAmp; // Shifts pixels on the x-axis |
| 80 | |
| 81 | int source_px = lround(pixel + waveVal); |
| 82 | if (source_px < 0) |
| 83 | source_px = 0; |
| 84 | if (source_px >= pixel_count) |
| 85 | source_px = pixel_count - 1; |
| 86 | |
| 87 | // Calculate source array location, and target array location, and copy the 4 color values |
| 88 | memcpy(&pixels[pixel * 4], &original_pixels[source_px * 4], sizeof(char) * 4); |
| 89 | } |
| 90 | |
| 91 | // return the modified frame |
| 92 | return frame; |
| 93 | } |
| 94 | |
| 95 | // Generate JSON string of this object |
| 96 | std::string Wave::Json() const { |