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SPE-2691: Fixed resizing of thumbnails to maintain aspect ratio of the image

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This commit is contained in:
Lukas Matena 2025-02-20 14:18:11 +01:00
parent 18894644aa
commit 8350e395a7
1 changed files with 29 additions and 8 deletions
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37
src/CLI/ProcessActions.cpp
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@ -171,6 +171,34 @@ static bool export_models(std::vector<Model>& models, IO::ExportFormat format, c
return true;
}
static ThumbnailData resize_and_crop(const std::vector<unsigned char>& data, int width, int height, int width_new, int height_new) {
ThumbnailData th;
float scale_x = float(width_new) / width;
float scale_y = float(height_new) / height;
float scale = std::max(scale_x, scale_y); // Choose the larger scale to fill the box
int resized_width = int(width * scale);
int resized_height = int(height * scale);
std::vector<unsigned char> resized_rgba(resized_width * resized_height * 4);
stbir_resize_uint8_linear(data.data(), width, height, 4 * width,
resized_rgba.data(), resized_width, resized_height, 4 * resized_width,
STBIR_RGBA);
th.set(width_new, height_new);
int crop_x = (resized_width - width_new) / 2;
int crop_y = (resized_height - height_new) / 2;
for (int y = 0; y < height_new; ++y) {
std::memcpy(th.pixels.data() + y * width_new * 4,
resized_rgba.data() + ((y + crop_y) * resized_width + crop_x) * 4,
width_new * 4);
}
return th;
}
static std::function<ThumbnailsList(const ThumbnailsParams&)> get_thumbnail_generator_cli(const std::string& filename)
{
if (boost::iends_with(filename, ".3mf")) {
@ -214,15 +242,8 @@ static std::function<ThumbnailsList(const ThumbnailsParams&)> get_thumbnail_gene
}
for (const Vec2d& size : params.sizes) {
ThumbnailData th;
Point isize(size);
th.set(isize.x(), isize.y());
std::vector<unsigned char> resized_rgba(th.width * th.height * 4);
stbir_resize_uint8_linear(data.data(), width, height, 4 * width,
resized_rgba.data(), th.width, th.height, 4 * th.width,
STBIR_RGBA);
th.pixels = resized_rgba;
list_out.push_back(th);
list_out.push_back(resize_and_crop(data, width, height, isize.x(), isize.y()));
}
return list_out;
};