image: add reload options (#247)

* image: add reload options

* check for actual file changes

* use modtime

* check only same paths

* add Nix HM

nix/hm-module.nix

@@ -225,6 +225,18 @@ in {
             default = 0.0;
           };
 
+          reload_time = mkOption {
+            description = "Interval in seconds between reloading the image";
+            type = int;
+            default = -1;
+          };
+
+          reload_cmd = mkOption {
+            description = "Command to obtain new path";
+            type = str;
+            default = "";
+          };
+
           position = {
             x = mkOption {
               description = "X position of the image";
@@ -558,6 +570,8 @@ in {
             border_size = ${toString image.border_size}
             border_color = ${image.border_color}
             rotate = ${toString image.rotate}
+            reload_time = ${toString image.reload_time}
+            reload_cmd = ${image.reload_cmd}
 
             position = ${toString image.position.x}, ${toString image.position.y}
             halign = ${image.halign}

src/config/ConfigManager.cpp

@@ -73,6 +73,8 @@ void CConfigManager::init() {
     m_config.addSpecialConfigValue("image", "halign", Hyprlang::STRING{"center"});
     m_config.addSpecialConfigValue("image", "valign", Hyprlang::STRING{"center"});
     m_config.addSpecialConfigValue("image", "rotate", Hyprlang::FLOAT{0});
+    m_config.addSpecialConfigValue("image", "reload_time", Hyprlang::INT{-1});
+    m_config.addSpecialConfigValue("image", "reload_cmd", Hyprlang::STRING{""});
     SHADOWABLE("image");
 
     m_config.addSpecialCategory("input-field", Hyprlang::SSpecialCategoryOptions{.key = nullptr, .anonymousKeyBased = true});
@@ -184,6 +186,8 @@ std::vector<CConfigManager::SWidgetConfig> CConfigManager::getWidgetConfigs() {
                 {"halign", m_config.getSpecialConfigValue("image", "halign", k.c_str())},
                 {"valign", m_config.getSpecialConfigValue("image", "valign", k.c_str())},
                 {"rotate", m_config.getSpecialConfigValue("image", "rotate", k.c_str())},
+                {"reload_time", m_config.getSpecialConfigValue("image", "reload_time", k.c_str())},
+                {"reload_cmd", m_config.getSpecialConfigValue("image", "reload_cmd", k.c_str())},
                 SHADOWABLE("image"),
             }
         });

src/renderer/AsyncResourceGatherer.cpp

@@ -203,6 +203,25 @@ void CAsyncResourceGatherer::apply() {
     applied = true;
 }
 
+void CAsyncResourceGatherer::renderImage(const SPreloadRequest& rq) {
+    SPreloadTarget target;
+    target.type = TARGET_IMAGE;
+    target.id   = rq.id;
+
+    const auto ABSOLUTEPATH  = absolutePath(rq.asset, "");
+    const auto CAIROISURFACE = cairo_image_surface_create_from_png(ABSOLUTEPATH.c_str());
+
+    const auto CAIRO = cairo_create(CAIROISURFACE);
+    cairo_scale(CAIRO, 1, 1);
+
+    target.cairo        = CAIRO;
+    target.cairosurface = CAIROISURFACE;
+    target.data         = cairo_image_surface_get_data(CAIROISURFACE);
+    target.size         = {(double)cairo_image_surface_get_width(CAIROISURFACE), (double)cairo_image_surface_get_height(CAIROISURFACE)};
+
+    preloadTargets.push_back(target);
+}
+
 void CAsyncResourceGatherer::renderText(const SPreloadRequest& rq) {
     SPreloadTarget target;
     target.type = TARGET_IMAGE; /* text is just an image lol */
@@ -314,6 +333,8 @@ void CAsyncResourceGatherer::asyncAssetSpinLock() {
         for (auto& r : requests) {
             if (r.type == TARGET_TEXT) {
                 renderText(r);
+            } else if (r.type == TARGET_IMAGE) {
+                renderImage(r);
             } else {
                 Debug::log(ERR, "Unsupported async preload type {}??", (int)r.type);
                 continue;

src/renderer/AsyncResourceGatherer.hpp

@@ -56,6 +56,7 @@ class CAsyncResourceGatherer {
 
     void        asyncAssetSpinLock();
     void        renderText(const SPreloadRequest& rq);
+    void        renderImage(const SPreloadRequest& rq);
 
     struct {
         std::condition_variable      loopGuard;

src/renderer/widgets/Image.cpp

@@ -1,7 +1,76 @@
 #include "Image.hpp"
 #include "../Renderer.hpp"
+#include "../../core/hyprlock.hpp"
+#include "../../helpers/Log.hpp"
 #include <cmath>
 
+CImage::~CImage() {
+    imageTimer->cancel();
+    imageTimer.reset();
+}
+
+static void onTimer(std::shared_ptr<CTimer> self, void* data) {
+    const auto PIMAGE = (CImage*)data;
+
+    PIMAGE->onTimerUpdate();
+    PIMAGE->plantTimer();
+}
+
+static void onAssetCallback(void* data) {
+    const auto PIMAGE = (CImage*)data;
+    PIMAGE->renderSuper();
+}
+
+void CImage::onTimerUpdate() {
+    const std::string OLDPATH = path;
+
+    if (!reloadCommand.empty()) {
+        path = g_pHyprlock->spawnSync(reloadCommand);
+
+        if (path.ends_with('\n'))
+            path.pop_back();
+
+        if (path.starts_with("file://"))
+            path = path.substr(7);
+
+        if (path.empty())
+            return;
+    }
+
+    try {
+        const auto MTIME = std::filesystem::last_write_time(path);
+        if (OLDPATH == path && MTIME == modificationTime)
+            return;
+
+        modificationTime = MTIME;
+    } catch (std::exception& e) {
+        path = OLDPATH;
+        Debug::log(ERR, "{}", e.what());
+        return;
+    }
+
+    if (!pendingResourceID.empty())
+        return;
+
+    request.id        = std::string{"image:"} + path + ",time:" + std::to_string(modificationTime.time_since_epoch().count());
+    pendingResourceID = request.id;
+    request.asset     = path;
+    request.type      = CAsyncResourceGatherer::eTargetType::TARGET_IMAGE;
+
+    request.callback     = onAssetCallback;
+    request.callbackData = this;
+
+    g_pRenderer->asyncResourceGatherer->requestAsyncAssetPreload(request);
+}
+
+void CImage::plantTimer() {
+
+    if (reloadTime == 0) {
+        imageTimer = g_pHyprlock->addTimer(std::chrono::hours(1), onTimer, this, true);
+    } else if (reloadTime > 0)
+        imageTimer = g_pHyprlock->addTimer(std::chrono::seconds(reloadTime), onTimer, this, false);
+}
+
 CImage::CImage(const Vector2D& viewport_, COutput* output_, const std::string& resourceID_, const std::unordered_map<std::string, std::any>& props) :
     viewport(viewport_), resourceID(resourceID_), output(output_), shadow(this, props, viewport_) {
 
@@ -14,11 +83,38 @@ CImage::CImage(const Vector2D& viewport_, COutput* output_, const std::string& r
     valign   = std::any_cast<Hyprlang::STRING>(props.at("valign"));
     angle    = std::any_cast<Hyprlang::FLOAT>(props.at("rotate"));
 
+    path          = std::any_cast<Hyprlang::STRING>(props.at("path"));
+    reloadTime    = std::any_cast<Hyprlang::INT>(props.at("reload_time"));
+    reloadCommand = std::any_cast<Hyprlang::STRING>(props.at("reload_cmd"));
+
+    try {
+        modificationTime = std::filesystem::last_write_time(path);
+    } catch (std::exception& e) { Debug::log(ERR, "{}", e.what()); }
+
     angle = angle * M_PI / 180.0;
+
+    plantTimer();
 }
 
 bool CImage::draw(const SRenderData& data) {
 
+    if (!pendingResourceID.empty()) {
+        auto newAsset = g_pRenderer->asyncResourceGatherer->getAssetByID(pendingResourceID);
+        if (newAsset) {
+            if (newAsset->texture.m_iType == TEXTURE_INVALID) {
+                g_pRenderer->asyncResourceGatherer->unloadAsset(newAsset);
+            } else if (resourceID != pendingResourceID) {
+                g_pRenderer->asyncResourceGatherer->unloadAsset(asset);
+                imageFB.release();
+
+                asset       = newAsset;
+                resourceID  = pendingResourceID;
+                firstRender = true;
+            }
+            pendingResourceID = "";
+        }
+    }
+
     if (resourceID.empty())
         return false;
 
@@ -54,6 +150,8 @@ bool CImage::draw(const SRenderData& data) {
         borderBox.round();
         imageFB.alloc(borderBox.w, borderBox.h, true);
         g_pRenderer->pushFb(imageFB.m_iFb);
+        glClearColor(0.0, 0.0, 0.0, 0.0);
+        glClear(GL_COLOR_BUFFER_BIT);
 
         if (border > 0)
             g_pRenderer->renderRect(borderBox, color, ALLOWROUND ? rounding : std::min(borderBox.w, borderBox.h) / 2.0);
@@ -84,3 +182,15 @@ bool CImage::draw(const SRenderData& data) {
 
     return data.opacity < 1.0;
 }
+
+static void onAssetCallbackTimer(std::shared_ptr<CTimer> self, void* data) {
+    const auto PIMAGE = (CImage*)data;
+    PIMAGE->renderSuper();
+}
+
+void CImage::renderSuper() {
+    g_pHyprlock->renderOutput(output->stringPort);
+
+    if (!pendingResourceID.empty()) /* did not consume the pending resource */
+        g_pHyprlock->addTimer(std::chrono::milliseconds(100), onAssetCallbackTimer, this);
+}

src/renderer/widgets/Image.hpp

@@ -3,8 +3,11 @@
 #include "IWidget.hpp"
 #include "../../helpers/Vector2D.hpp"
 #include "../../helpers/Color.hpp"
+#include "../../core/Timer.hpp"
+#include "../AsyncResourceGatherer.hpp"
 #include "Shadowable.hpp"
 #include <string>
+#include <filesystem>
 #include <unordered_map>
 #include <any>
 
@@ -14,9 +17,14 @@ class COutput;
 class CImage : public IWidget {
   public:
     CImage(const Vector2D& viewport, COutput* output_, const std::string& resourceID, const std::unordered_map<std::string, std::any>& props);
+    ~CImage();
 
     virtual bool draw(const SRenderData& data);
 
+    void         renderSuper();
+    void         onTimerUpdate();
+    void         plantTimer();
+
   private:
     CFramebuffer                            imageFB;
 
@@ -27,12 +35,19 @@ class CImage : public IWidget {
     CColor                                  color;
     Vector2D                                pos;
 
-    std::string      halign, valign;
+    std::string                             halign, valign, path;
 
     bool                                    firstRender = true;
 
+    int                                     reloadTime;
+    std::string                             reloadCommand;
+    std::filesystem::file_time_type         modificationTime;
+    std::shared_ptr<CTimer>                 imageTimer;
+    CAsyncResourceGatherer::SPreloadRequest request;
+
     Vector2D                                viewport;
     std::string                             resourceID;
+    std::string                             pendingResourceID; // if reloading image
     SPreloadedAsset*                        asset  = nullptr;
     COutput*                                output = nullptr;
     CShadowable                             shadow;