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image_viewer.cc
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image_viewer.cc
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//
// image_viewer.cc
// Copyright (C) 2024 Richard Bradley
//
// TODO: background loading of images after 1st image loaded
// TODO: multiple image display in fullscreen (horizontal/vertical)
// TODO: smooth scrolling when moving to next image
// TODO: zoom in/out at mouse point
// TODO: default starting zoom command line setting
// TODO: add support for font files (like font_viewer)
#include "gx/Image.hh"
#include "gx/Logger.hh"
#include "gx/Window.hh"
#include "gx/DrawContext.hh"
#include "gx/Print.hh"
#include "gx/StringUtil.hh"
#include "gx/CmdLineParser.hh"
#include <vector>
using gx::println;
using gx::println_err;
// globals
int winWidth = -1;
int winHeight = -1;
void setWinSize(gx::Window& win, const gx::Image& img)
{
const int w = (winWidth > 0) ? winWidth : img.width();
const int h = (winHeight > 0) ? winHeight : img.height();
win.setSize(w, h, false);
}
struct Entry {
std::string file;
gx::Image img;
gx::TextureHandle tex;
};
struct ImgSize { float width, height; };
[[nodiscard]] ImgSize calcSize(
const gx::Window& win, const gx::Image& img, float scale)
{
const auto [width,height] = win.dimensions();
float iw = float(width);
float ih = float(height);
if (win.fullScreen()) {
const float w_ratio = float(width) / float(img.width());
const float h_ratio = float(height) / float(img.height());
if (w_ratio > h_ratio) {
iw = float(img.width()) * h_ratio;
} else {
ih = float(img.height()) * w_ratio;
}
}
return {iw*scale, ih*scale};
}
int showUsage(const char* const* argv)
{
println("Usage: ", argv[0], " [options] <image file(s)>");
println("Options:");
println(" --width=PIXELS Set window width");
println(" --height=PIXELS Set window height");
println(" --fullscreen Start in fullscreen mode");
println(" --filter=(linear|nearest) Image filter setting");
println(" -h,--help Show usage");
return 0;
}
int errorUsage(const char* const* argv)
{
println_err("Try '", argv[0], " --help' for more information.");
return -1;
}
int main(int argc, char* argv[])
{
if (argc < 2) {
println_err("No image filenames specified");
return errorUsage(argv);
}
gx::defaultLogger().disable();
// command line processing
bool startFullScreen = false;
gx::FilterType magFilter = gx::FILTER_NEAREST;
std::string val;
std::vector<Entry> entries;
for (gx::CmdLineParser p{argc, argv}; p; ++p) {
if (p.option()) {
if (p.option(0,"width", winWidth)) {
if (winWidth <= 0) {
println_err("ERROR: invalid width");
return errorUsage(argv);
}
} else if (p.option(0,"height", winHeight)) {
if (winHeight <= 0) {
println_err("ERROR: invalid height");
return errorUsage(argv);
}
} else if (p.option(0,"fullscreen")) {
startFullScreen = true;
} else if (p.option(0,"filter", val)) {
if (val == "nearest") { magFilter = gx::FILTER_NEAREST; }
else if (val == "linear") { magFilter = gx::FILTER_LINEAR; }
else {
println_err("ERROR: unknown filter type '", val, "'");
return errorUsage(argv);
}
} else if (p.option('h',"help")) {
return showUsage(argv);
} else {
println_err("ERROR: Bad option '", p.arg(), "'");
return errorUsage(argv);
}
} else {
// filename argument
Entry e;
p.get(e.file);
if (!e.img.load(e.file)) {
println_err("Can't load \"", e.file, "\"");
continue;
}
entries.push_back(std::move(e));
}
}
if (entries.empty()) {
println_err("No images to display");
return -1;
}
gx::Window win;
if (startFullScreen) {
win.setSize(0, 0, true);
} else {
setWinSize(win, entries[0].img);
}
if (!win.open(gx::WINDOW_RESIZABLE | gx::WINDOW_FIXED_ASPECT_RATIO)) {
println_err("Failed to open window");
return -1;
}
int zoom = 100;
float imgScale = 1.0f;
gx::Vec2 imgOffset;
gx::Vec2 pressPos;
const int lastNo = int(entries.size()) - 1;
gx::TextureParams params;
params.levels = 6;
params.minFilter = gx::FILTER_LINEAR;
params.magFilter = magFilter;
params.mipFilter = gx::FILTER_LINEAR;
gx::Renderer& ren = win.renderer();
int entryNo = 0;
for (Entry& e : entries) {
e.tex = ren.newTexture(e.img, params);
}
gx::DrawList dl;
gx::DrawContext dc{dl};
bool redraw = true, running = true;
constexpr float border = 8.0f;
// main loop
while (running) {
// handle events
gx::Window::pollEvents();
const gx::EventState& es = win.eventState();
if (es.events & gx::EVENT_SIZE) { redraw = true; }
if (es.events & gx::EVENT_CLOSE) { running = false; }
if (es.events & gx::EVENT_KEY) {
int no = entryNo;
const bool last_entry = (no == lastNo);
const bool first_entry = (no == 0);
for (const auto& k : es.keyStates) {
if (!k.pressCount && !k.repeatCount) { continue; }
switch (k.key) {
case gx::KEY_LEFT: case gx::KEY_BACKSPACE:
if ((k.pressCount || !first_entry) && --no < 0) { no = lastNo; }
break;
case gx::KEY_RIGHT: case gx::KEY_SPACE:
if ((k.pressCount || !last_entry) && ++no > lastNo) { no = 0; }
break;
case gx::KEY_HOME: no = 0; break;
case gx::KEY_END: no = lastNo; break;
case gx::KEY_ESCAPE: running = false; break;
case gx::KEY_F11:
if (k.pressCount) {
redraw = true;
zoom = 100;
imgScale = 1.0f;
imgOffset = {0,0};
if (win.fullScreen()) {
setWinSize(win, entries[std::size_t(entryNo)].img);
} else {
win.setSize(0, 0, true);
}
}
break;
}
}
if (no != entryNo) {
imgOffset = {0,0};
entryNo = no;
const Entry& e = entries[std::size_t(entryNo)];
if (!win.fullScreen()) { setWinSize(win, e.img); }
win.setTitle(
gx::concat(e.file, " - ", e.img.width(), 'x', e.img.height(),
'x', e.img.channels()));
redraw = true;
}
}
if (win.fullScreen()) {
if (es.events & gx::EVENT_MOUSE_SCROLL) {
const bool shiftHeld = es.mods & gx::MOD_SHIFT;
const int scroll = static_cast<int>(es.scrollPt.y * (shiftHeld ? 8.0f : 1.0f));
const int zoom2 = std::clamp(zoom + scroll, 20, 400);
if (zoom != zoom2) {
zoom = zoom2;
imgScale = gx::sqr(float(std::max(zoom, 1)) / 100.f);
// TODO: adjust imgOffset to zoom in at mouse point/screen center
redraw = true;
}
}
if (es.buttonPress(gx::BUTTON1)) {
pressPos = es.mousePt;
} else if (es.buttonDrag(gx::BUTTON1)) {
const auto pt = es.mousePt;
imgOffset += (pt - pressPos);
pressPos = pt;
redraw = true;
}
}
// draw frame
const Entry& e = entries[std::size_t(entryNo)];
if (redraw) {
const auto [width,height] = win.dimensions();
const auto [iw,ih] = calcSize(win, e.img, imgScale);
const float ix = std::floor((float(width) - iw) * .5f);
const float iy = std::floor((float(height) - ih) * .5f);
dc.clearList();
dc.clearView(gx::BLACK);
dc.color(gx::WHITE);
dc.texture(e.tex);
dc.rectangle({ix + imgOffset.x, iy + imgOffset.y, iw, ih}, {0,0}, {1,1});
// multi-image horizontal display in fullscreen
if (win.fullScreen() && iw < (float(width) - border)) {
dc.color(gx::GRAY50);
// display previous image(s)
float prev_x = ix;
for (int x = entryNo - 1; x >= 0; --x) {
const Entry& e0 = entries[std::size_t(x)];
const auto [iw0,ih0] = calcSize(win, e0.img, imgScale);
const float ix0 = std::floor(prev_x - (iw0 + border)); prev_x = ix0;
//if ((ix0+iw0) < 0) { break; }
const float iy0 = std::floor((float(win.height()) - ih0) * .5f);
dc.texture(e0.tex);
dc.rectangle({ix0 + imgOffset.x, iy0 + imgOffset.y, iw0, ih0},
{0,0}, {1,1});
}
// display next image(s)
prev_x = ix + iw + border;
for (int x = entryNo + 1; x <= lastNo; ++x) {
const Entry& e1 = entries[std::size_t(x)];
const auto [iw1,ih1] = calcSize(win, e1.img, imgScale);
const float ix1 = prev_x; prev_x += std::floor(iw1 + border);
//if (ix1 > float(width)) { break; }
const float iy1 = std::floor((float(win.height()) - ih1) * .5f);
dc.texture(e1.tex);
dc.rectangle({ix1 + imgOffset.x, iy1 + imgOffset.y, iw1, ih1},
{0,0}, {1,1});
}
}
win.draw(dl);
redraw = false;
}
win.renderFrame();
}
return 0;
}