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/**
* @file
* @brief Unit tests for openshot::Caption
* @author Jonathan Thomas <jonathan@openshot.org>
*
* @ref License
*/
// Copyright (c) 2008-2023 OpenShot Studios, LLC
//
// SPDX-License-Identifier: LGPL-3.0-or-later
#include <vector>
#include "openshot_catch.h"
#include <QApplication>
#include <QFontDatabase>
#include "effects/Caption.h"
#include "Clip.h"
#include "Frame.h"
#include "Timeline.h"
// Function to check for non-black pixels in a given region of the frame
bool HasNonBlackPixelsInRegion(const std::shared_ptr<openshot::Frame>& frame, int start_row, int end_row, int start_col, int end_col) {
int frame_width = frame->GetWidth();
int frame_height = frame->GetHeight();
// Ensure the search region is within the frame bounds
if (start_row < 0 || end_row >= frame_height || start_col < 0 || end_col >= frame_width) {
throw std::out_of_range("Search region is out of frame bounds");
}
for (int row = start_row; row <= end_row; ++row) {
const unsigned char* pixels = frame->GetPixels(row);
if (!pixels) {
throw std::runtime_error("Failed to get pixels for the row");
}
for (int col = start_col; col <= end_col; ++col) {
int index = col * 4;
int R = pixels[index];
int G = pixels[index + 1];
int B = pixels[index + 2];
if (!(R == 0 && G == 0 && B == 0)) {
return true; // Non-black pixel found
}
}
}
return false; // No non-black pixel found
}
TEST_CASE("caption effect", "[libopenshot][caption]") {
// Check for QT Platform Environment variable - and ignore these tests if it's set to offscreen
if (std::getenv("QT_QPA_PLATFORM") != nullptr) {
std::string qt_platform_env = std::getenv("QT_QPA_PLATFORM");
if (qt_platform_env == "offscreen") {
std::cout << "Ignoring Caption unit tests due to invalid QT Platform: offscreen" << std::endl;
return;
}
}
int argc = 1;
char* argv[1] = {(char*)""};
QGuiApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
QApplication app(argc, argv);
QApplication::processEvents();
SECTION("default constructor") {
// Create an empty caption
openshot::Caption c1;
CHECK(c1.color.GetColorHex(1) == "#ffffff");
CHECK(c1.stroke.GetColorHex(1) == "#a9a9a9");
CHECK(c1.background.GetColorHex(1) == "#000000");
CHECK(c1.background_alpha.GetValue(1) == Approx(0.0f).margin(0.00001));
CHECK(c1.left.GetValue(1) == Approx(0.10f).margin(0.00001));
CHECK(c1.right.GetValue(1) == Approx(0.10f).margin(0.00001));
CHECK(c1.top.GetValue(1) == Approx(0.75).margin(0.00001));
CHECK(c1.stroke_width.GetValue(1) == Approx(0.5f).margin(0.00001));
CHECK(c1.font_size.GetValue(1) == Approx(30.0f).margin(0.00001));
CHECK(c1.font_alpha.GetValue(1) == Approx(1.0f).margin(0.00001));
CHECK(c1.font_name == "sans");
CHECK(c1.fade_in.GetValue(1) == Approx(0.35f).margin(0.00001));
CHECK(c1.fade_out.GetValue(1) == Approx(0.35f).margin(0.00001));
CHECK(c1.background_corner.GetValue(1) == Approx(10.0f).margin(0.00001));
CHECK(c1.background_padding.GetValue(1) == Approx(20.0f).margin(0.00001));
CHECK(c1.line_spacing.GetValue(1) == Approx(1.0f).margin(0.00001));
CHECK(c1.CaptionText() == "00:00:00:000 --> 00:10:00:000\nEdit this caption with our caption editor");
// Load clip with video
std::stringstream path;
path << TEST_MEDIA_PATH << "sintel_trailer-720p.mp4";
openshot::Clip clip1(path.str());
clip1.Open();
// Add Caption effect
clip1.AddEffect(&c1);
// Get frame
std::shared_ptr<openshot::Frame> f = clip1.GetFrame(10);
// Verify pixel values (black background pixels)
const unsigned char* pixels = f->GetPixels(1);
CHECK((int)pixels[0 * 4] == 0);
// Check for non-black pixels in the region for white text
CHECK(HasNonBlackPixelsInRegion(f, 560, 700, 200, 600));
// Create Timeline
openshot::Timeline t(1280, 720, openshot::Fraction(24, 1), 44100, 2, openshot::LAYOUT_STEREO);
t.AddClip(&clip1);
// Get timeline frame
f = t.GetFrame(10);
// Verify pixel values (black background pixels)
pixels = f->GetPixels(1);
CHECK((int)pixels[0 * 4] == 0);
// Check for non-black pixels in the region for white text
CHECK(HasNonBlackPixelsInRegion(f, 560, 700, 200, 600));
// Close objects
t.Close();
clip1.Close();
}
SECTION("audio captions") {
// Create an empty caption
openshot::Caption c1;
// Load clip with audio file
std::stringstream path;
path << TEST_MEDIA_PATH << "piano.wav";
openshot::Clip clip1(path.str());
clip1.Open();
// Add Caption effect
clip1.AddEffect(&c1);
// Get frame
std::shared_ptr<openshot::Frame> f = clip1.GetFrame(10);
f->Save("/home/jonathan/test.png", 1.0, "PNG", 100);
// Verify pixel values (black background pixels)
const unsigned char* pixels = f->GetPixels(1);
CHECK((int)pixels[0 * 4] == 0);
// Check for non-black pixels in the region for white text
CHECK(HasNonBlackPixelsInRegion(f, 350, 479, 150, 500));
// Create Timeline
openshot::Timeline t(720, 480, openshot::Fraction(24, 1), 44100, 2, openshot::LAYOUT_STEREO);
t.AddClip(&clip1);
// Get timeline frame
f = t.GetFrame(10);
// Verify pixel values (black background pixels)
pixels = f->GetPixels(1);
CHECK((int)pixels[0 * 4] == 0);
// Check for non-black pixels in the region for white text
CHECK(HasNonBlackPixelsInRegion(f, 200, 479, 200, 600));
// Close objects
t.Close();
clip1.Close();
}
SECTION("long single-line caption") {
// Create an single-line long caption
std::string caption_text = "00:00.000 --> 00:10.000\nそれが今のF1レースでは時速300kmですから、すごい進歩です。命知らずのレーザーたちによって車のスピードは更新されていったのです。";
openshot::Caption c1(caption_text);
// Load clip with video file
std::stringstream path;
path << TEST_MEDIA_PATH << "sintel_trailer-720p.mp4";
openshot::Clip clip1(path.str());
clip1.Open();
// Add Caption effect
clip1.AddEffect(&c1);
// Get frame
std::shared_ptr<openshot::Frame> f = clip1.GetFrame(11);
// Verify pixel values (black background pixels)
const unsigned char *pixels = f->GetPixels(1);
CHECK((int) pixels[0 * 4] == 0);
// Check for non-black pixels in the region for white text
CHECK(HasNonBlackPixelsInRegion(f, 560, 700, 200, 600));
// Close objects
clip1.Close();
}
// Close QApplication
app.quit();
}
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