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#include "ui/animated_image.h"
#include "core/log.h"
#include <glad/gl.h>
#define STB_IMAGE_IMPLEMENTATION
#define STBI_ONLY_GIF
#define STBI_ONLY_PNG
#define STBI_ONLY_JPEG
#define STBI_ONLY_BMP
#include <stb_image.h>
#include <algorithm>
#include <cstdlib>
#include <fstream>
#include <iterator>
namespace Hsdbg
{
namespace
{
constexpr float MIN_FRAME_SECONDS = 0.02f;
auto bleed_edges(unsigned char* rgba, int width, int height) -> void
{
for (int y = 0; y < height; ++y)
{
for (int x = 0; x < width; ++x)
{
unsigned char* pixel = rgba + (static_cast<std::size_t>(y) * width + x) * 4;
if (pixel[3] != 0)
continue;
int red = 0;
int green = 0;
int blue = 0;
int count = 0;
for (int dy = -1; dy <= 1; ++dy)
{
for (int dx = -1; dx <= 1; ++dx)
{
const int nx = x + dx;
const int ny = y + dy;
if (nx < 0 || ny < 0 || nx >= width || ny >= height)
continue;
const unsigned char* near =
rgba + (static_cast<std::size_t>(ny) * width + nx) * 4;
if (near[3] == 0)
continue;
red += near[0];
green += near[1];
blue += near[2];
++count;
}
}
if (count == 0)
continue;
pixel[0] = static_cast<unsigned char>(red / count);
pixel[1] = static_cast<unsigned char>(green / count);
pixel[2] = static_cast<unsigned char>(blue / count);
}
}
}
auto upload(const unsigned char* rgba, int width, int height) -> unsigned int
{
unsigned int texture = 0;
glGenTextures(1, &texture);
glBindTexture(GL_TEXTURE_2D, texture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, rgba);
glBindTexture(GL_TEXTURE_2D, 0);
return texture;
}
auto read_file(const std::filesystem::path& path) -> std::vector<unsigned char>
{
std::ifstream file(path, std::ios::binary);
if (!file.is_open())
return {};
return std::vector<unsigned char>(std::istreambuf_iterator<char>(file),
std::istreambuf_iterator<char>());
}
}
AnimatedImage::~AnimatedImage()
{
unload();
}
auto AnimatedImage::unload() -> void
{
if (!m_frames.empty())
glDeleteTextures(static_cast<int>(m_frames.size()), m_frames.data());
m_frames.clear();
m_delays.clear();
m_width = 0;
m_height = 0;
m_current = 0;
m_accumulator = 0.0f;
}
auto AnimatedImage::load(const std::filesystem::path& path) -> bool
{
unload();
const std::vector<unsigned char> bytes = read_file(path);
if (bytes.empty())
{
Log::warn("image: could not read '{}'", path.string());
return false;
}
const auto length = static_cast<int>(bytes.size());
int width = 0;
int height = 0;
int comp = 0;
int frames = 0;
int* delays = nullptr;
if (stbi_uc* data = stbi_load_gif_from_memory(bytes.data(), length, &delays,
&width, &height, &frames, &comp, 4))
{
m_width = width;
m_height = height;
for (int index = 0; index < frames; ++index)
{
stbi_uc* frame = data + static_cast<std::size_t>(index) * width * height * 4;
bleed_edges(frame, width, height);
m_frames.push_back(upload(frame, width, height));
const float seconds = delays != nullptr
? static_cast<float>(delays[index]) / 1000.0f
: 0.1f;
m_delays.push_back(std::max(seconds, MIN_FRAME_SECONDS));
}
stbi_image_free(data);
std::free(delays);
}
else if (stbi_uc* still = stbi_load_from_memory(bytes.data(), length,
&width, &height, &comp, 4))
{
m_width = width;
m_height = height;
bleed_edges(still, width, height);
m_frames.push_back(upload(still, width, height));
m_delays.push_back(MIN_FRAME_SECONDS);
stbi_image_free(still);
}
else
{
Log::warn("image: could not decode '{}': {}", path.string(), stbi_failure_reason());
return false;
}
Log::info("image: loaded '{}' ({}x{}, {} frame{})",
path.string(),
m_width,
m_height,
m_frames.size(),
m_frames.size() == 1 ? "" : "s");
return true;
}
auto AnimatedImage::advance(float delta_seconds) -> void
{
if (m_frames.size() < 2)
return;
m_accumulator += delta_seconds;
for (int step = 0; step < 1000 && m_accumulator >= m_delays[m_current]; ++step)
{
m_accumulator -= m_delays[m_current];
m_current = (m_current + 1) % m_frames.size();
}
}
auto AnimatedImage::texture() const -> unsigned int
{
return m_frames.empty() ? 0 : m_frames[m_current];
}
}
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