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fix: crash when taking screenshot

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Almamu 2025-04-01 01:20:55 +02:00
parent e17c4f319e
commit b7735298be
1 changed files with 19 additions and 6 deletions
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25
src/WallpaperEngine/Application/CWallpaperApplication.cpp
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@ -223,27 +223,38 @@ void CWallpaperApplication::takeScreenshot (const std::filesystem::path& filenam
// this should be getting called at the end of the frame, so the right thing should be bound already
const int width = this->m_renderContext->getOutput ().getFullWidth ();
const int height = this->m_renderContext->getOutput ().getFullHeight ();
const bool vflip = this->m_renderContext->getOutput ().renderVFlip ();
// build the output file with stbi_image_write
auto* bitmap = new uint8_t [width * height * sizeof (uint8_t) * 3] {0};
auto* bitmap = new uint8_t [width * height * 3] {0};
int xoffset = 0;
for (const auto& [screen, viewport] : this->m_renderContext->getOutput ().getViewports ()) {
// activate opengl context so we can read from the framebuffer
viewport->makeCurrent ();
// make room for storing the pixel of this viewport
auto* buffer = new uint8_t [viewport->viewport.z * viewport->viewport.w * sizeof (uint8_t) * 3];
const auto bufferSize = (viewport->viewport.z - viewport->viewport.x) * (viewport->viewport.w - viewport->viewport.y) * 3;
auto* buffer = new uint8_t [bufferSize];
const uint8_t* pixel = buffer;
// read the viewport data into the pixel buffer
glReadPixels (viewport->viewport.x, viewport->viewport.y, viewport->viewport.z, viewport->viewport.w, GL_RGB,
GL_UNSIGNED_BYTE, buffer);
glPixelStorei (GL_PACK_ALIGNMENT, 1);
glReadnPixels (viewport->viewport.x, viewport->viewport.y, viewport->viewport.z, viewport->viewport.w, GL_RGB,
GL_UNSIGNED_BYTE, bufferSize, buffer);
GLenum error = glGetError();
if (error != GL_NO_ERROR) {
sLog.error ("Cannot obtain pixel data for screen ", screen, ". OpenGL error: ", error);
delete [] buffer;
continue;
}
// now get access to the pixels
for (int y = viewport->viewport.w; y > 0; y--) {
for (int y = 0; y < viewport->viewport.w; y++) {
for (int x = 0; x < viewport->viewport.z; x++) {
int xfinal = x + xoffset;
int yfinal = this->m_renderContext->getOutput ().renderVFlip () ? (viewport->viewport.w - y) : y;
int yfinal = vflip ? (viewport->viewport.w - y - 1) : y;
bitmap [yfinal * width * 3 + xfinal * 3] = *pixel++;
bitmap [yfinal * width * 3 + xfinal * 3 + 1] = *pixel++;
@ -267,6 +278,8 @@ void CWallpaperApplication::takeScreenshot (const std::filesystem::path& filenam
} else if (extension == ".jpg" || extension == ".jpeg") {
stbi_write_jpg (filename.c_str (), width, height, 3, bitmap, 100);
}
delete [] bitmap;
}
void CWallpaperApplication::show () {