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#include "../include/AsyncImageLoader.hpp"
#include "../include/DownloadUtils.hpp"
#include "../include/ImageUtils.hpp"
#include "../include/Scale.hpp"
#include "../include/SfmlFixes.hpp"
#include "../external/hash-library/sha256.h"
#include <assert.h>
namespace QuickMedia {
// Linear interpolation
// TODO: Is this implementation ok? it always uses +1 offset for interpolation but if we were to resize an image with near 1x1 scaling
// then it would be slightly blurry
static void copy_resize(const sf::Image &source, sf::Image &destination, sf::Vector2u destination_size) {
const sf::Vector2u source_size = source.getSize();
if(source_size.x == 0 || source_size.y == 0 || destination_size.x == 0 || destination_size.y == 0)
return;
//float width_ratio = (float)source_size.x / (float)destination_size.x;
//float height_ratio = (float)source_size.y / (float)destination_size.y;
const sf::Uint8 *source_pixels = source.getPixelsPtr();
// TODO: Remove this somehow. Right now we need to allocate this and also allocate the same array in the destination image
sf::Uint32 *destination_pixels = new sf::Uint32[destination_size.x * destination_size.y];
sf::Uint32 *destination_pixel = destination_pixels;
for(unsigned int y = 0; y < destination_size.y; ++y) {
for(unsigned int x = 0; x < destination_size.x; ++x) {
int scaled_x_start = ((float)x / (float)destination_size.x) * source_size.x;
int scaled_y_start = ((float)y / (float)destination_size.y) * source_size.y;
int scaled_x_end = ((float)(x + 1) / (float)destination_size.x) * source_size.x;
int scaled_y_end = ((float)(y + 1) / (float)destination_size.y) * source_size.y;
if(scaled_x_end > (int)source_size.x - 1) scaled_x_end = source_size.x - 1;
if(scaled_y_end > (int)source_size.y - 1) scaled_y_end = source_size.y - 1;
//float scaled_x = x * width_ratio;
//float scaled_y = y * height_ratio;
//sf::Uint32 *source_pixel = (sf::Uint32*)(source_pixels + (int)(scaled_x + scaled_y * source_size.x) * 4);
sf::Uint32 sum_red = 0;
sf::Uint32 sum_green = 0;
sf::Uint32 sum_blue = 0;
sf::Uint32 sum_alpha = 0;
sf::Uint32 num_colors = (scaled_x_end - scaled_x_start) * (scaled_y_end - scaled_y_start);
for(int yy = scaled_y_start; yy < scaled_y_end; ++yy) {
for(int xx = scaled_x_start; xx < scaled_x_end; ++xx) {
sf::Uint32 *source_pixel = (sf::Uint32*)(source_pixels + (xx + yy * source_size.x) * 4);
sum_red += (*source_pixel >> 24);
sum_green += ((*source_pixel >> 16) & 0xFF);
sum_blue += ((*source_pixel >> 8) & 0xFF);
sum_alpha += (*source_pixel & 0xFF);
}
}
sum_red /= num_colors;
sum_green /= num_colors;
sum_blue /= num_colors;
sum_alpha /= num_colors;
*destination_pixel = (sum_red << 24) | (sum_green << 16) | (sum_blue << 8) | sum_alpha;
++destination_pixel;
}
}
destination.create(destination_size.x, destination_size.y, (sf::Uint8*)destination_pixels);
delete []destination_pixels;
}
static bool save_image_as_thumbnail_atomic(const sf::Image &image, const Path &thumbnail_path, const char *ext) {
Path tmp_path = thumbnail_path;
tmp_path.append(".tmp");
const char *thumbnail_path_ext = thumbnail_path.ext();
if(is_image_ext(ext))
tmp_path.append(ext);
else if(is_image_ext(thumbnail_path_ext))
tmp_path.append(thumbnail_path_ext);
else
tmp_path.append(".png");
return image.saveToFile(tmp_path.data) && (rename(tmp_path.data.c_str(), thumbnail_path.data.c_str()) == 0);
}
// Returns empty string if no extension
static const char* get_ext(const std::string &path) {
size_t slash_index = path.rfind('/');
size_t index = path.rfind('.');
if(index != std::string::npos && (slash_index == std::string::npos || index > slash_index))
return path.c_str() + index;
return "";
}
static void create_thumbnail_if_thumbnail_smaller_than_image(const std::string &original_url, const Path &thumbnail_path, ThumbnailData *thumbnail_data, sf::Vector2i resize_target_size) {
sf::Vector2u new_image_size = clamp_to_size(thumbnail_data->image->getSize(), sf::Vector2u(resize_target_size.x, resize_target_size.y));
if(new_image_size.x < thumbnail_data->image->getSize().x || new_image_size.y < thumbnail_data->image->getSize().y) {
auto destination_image = std::make_unique<sf::Image>();
copy_resize(*thumbnail_data->image, *destination_image, new_image_size);
thumbnail_data->image = std::move(destination_image);
save_image_as_thumbnail_atomic(*thumbnail_data->image, thumbnail_path, get_ext(original_url));
thumbnail_data->loading_state = LoadingState::FINISHED_LOADING;
}
}
AsyncImageLoader::AsyncImageLoader() {
for(int i = 0; i < NUM_IMAGE_LOAD_THREADS; ++i) {
loading_image[i] = false;
}
load_image_thread = std::thread([this]{
std::optional<ThumbnailLoadData> thumbnail_load_data_opt;
while(true) {
thumbnail_load_data_opt = image_load_queue.pop_wait();
if(!thumbnail_load_data_opt)
break;
ThumbnailLoadData &thumbnail_load_data = thumbnail_load_data_opt.value();
thumbnail_load_data.thumbnail_data->image = std::make_unique<sf::Image>();
if(load_image_from_file(*thumbnail_load_data.thumbnail_data->image, thumbnail_load_data.thumbnail_path.data)) {
fprintf(stderr, "Loaded %s from thumbnail cache\n", thumbnail_load_data.path.data.c_str());
thumbnail_load_data.thumbnail_data->loading_state = LoadingState::FINISHED_LOADING;
continue;
}
if(thumbnail_load_data.local) {
if(load_image_from_file(*thumbnail_load_data.thumbnail_data->image, thumbnail_load_data.path.data)
&& thumbnail_load_data.resize_target_size.x != 0 && thumbnail_load_data.resize_target_size.y != 0)
{
create_thumbnail_if_thumbnail_smaller_than_image(thumbnail_load_data.path.data, thumbnail_load_data.thumbnail_path, thumbnail_load_data.thumbnail_data.get(), thumbnail_load_data.resize_target_size);
}
thumbnail_load_data.thumbnail_data->loading_state = LoadingState::FINISHED_LOADING;
} else {
thumbnail_load_data.thumbnail_data->loading_state = LoadingState::FINISHED_LOADING;
}
}
});
}
AsyncImageLoader::~AsyncImageLoader() {
image_load_queue.close();
if(load_image_thread.joinable())
load_image_thread.join();
// TODO: Find a way to kill the threads instead. We need to do this right now because creating a new thread before the last one has died causes a crash
for(size_t i = 0; i < NUM_IMAGE_LOAD_THREADS; ++i) {
if(download_image_thread[i].joinable())
download_image_thread[i].join();
}
}
void AsyncImageLoader::load_thumbnail(const std::string &url, bool local, sf::Vector2i resize_target_size, bool use_tor, std::shared_ptr<ThumbnailData> thumbnail_data) {
if(thumbnail_data->loading_state != LoadingState::NOT_LOADED)
return;
if(url.empty()) {
thumbnail_data->image = std::make_unique<sf::Image>();
thumbnail_data->loading_state = LoadingState::FINISHED_LOADING;
return;
}
SHA256 sha256;
sha256.add(url.data(), url.size());
Path thumbnail_path = get_cache_dir().join("thumbnails").join(sha256.getHash());
if(get_file_type(thumbnail_path) == FileType::REGULAR) {
thumbnail_data->loading_state = LoadingState::LOADING;
image_load_queue.push({ url, thumbnail_path, local, thumbnail_data, resize_target_size });
return;
} else if(local && get_file_type(url) == FileType::REGULAR) {
thumbnail_data->loading_state = LoadingState::LOADING;
image_load_queue.push({ url, thumbnail_path, true, thumbnail_data, resize_target_size });
return;
}
int free_index = get_free_load_index();
if(free_index == -1)
return;
loading_image[free_index] = true;
thumbnail_data->loading_state = LoadingState::LOADING;
if(download_image_thread[free_index].joinable())
download_image_thread[free_index].join();
// TODO: Keep the thread running and use conditional variable instead to sleep until a new image should be loaded. Same in ImageViewer.
download_image_thread[free_index] = std::thread([this, free_index, thumbnail_path, url, local, resize_target_size, thumbnail_data, use_tor]() mutable {
thumbnail_data->image = std::make_unique<sf::Image>();
if(load_image_from_file(*thumbnail_data->image, thumbnail_path.data)) {
fprintf(stderr, "Loaded %s from thumbnail cache\n", url.c_str());
thumbnail_data->loading_state = LoadingState::FINISHED_LOADING;
loading_image[free_index] = false;
return;
} else {
if(local) {
if(!load_image_from_file(*thumbnail_data->image, url)) {
thumbnail_data->loading_state = LoadingState::FINISHED_LOADING;
loading_image[free_index] = false;
return;
}
} else {
// Use the same path as the thumbnail path, since it wont be overwritten if the image is smaller than the thumbnail target size
if(download_to_file(url, thumbnail_path.data, {}, use_tor, true) != DownloadResult::OK || !load_image_from_file(*thumbnail_data->image, thumbnail_path.data)) {
thumbnail_data->loading_state = LoadingState::FINISHED_LOADING;
loading_image[free_index] = false;
return;
}
}
}
if(resize_target_size.x != 0 && resize_target_size.y != 0)
create_thumbnail_if_thumbnail_smaller_than_image(url, thumbnail_path, thumbnail_data.get(), resize_target_size);
thumbnail_data->loading_state = LoadingState::FINISHED_LOADING;
loading_image[free_index] = false;
return;
});
}
int AsyncImageLoader::get_free_load_index() const {
for(int i = 0; i < NUM_IMAGE_LOAD_THREADS; ++i) {
if(!loading_image[i])
return i;
}
return -1;
}
}
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