Fix scaling image for GTK4

2 files changed, 104 insertions, 180 deletions

diff --git a/main/src/ui/conversation_content_view/file_image_widget.vala b/main/src/ui/conversation_content_view/file_image_widget.vala
index 097ac695..ec8481b7 100644
--- a/main/src/ui/conversation_content_view/file_image_widget.vala
+++ b/main/src/ui/conversation_content_view/file_image_widget.vala
@@ -8,7 +8,6 @@ namespace Dino.Ui {
 
 public class FileImageWidget : Box {
 
-    private ScalingImage image;
     FileDefaultWidget file_default_widget;
     FileDefaultWidgetController file_default_widget_controller;
 
@@ -19,29 +18,7 @@ public class FileImageWidget : Box {
     }
 
     public async void load_from_file(File file, string file_name, int MAX_WIDTH=600, int MAX_HEIGHT=300) throws GLib.Error {
-        // Load and prepare image in tread
-        Thread<ScalingImage?> thread = new Thread<ScalingImage?> (null, () => {
-            ScalingImage image = new ScalingImage() { halign=Align.START, visible = true, max_width = MAX_WIDTH, max_height = MAX_HEIGHT };
-
-            Gdk.Pixbuf pixbuf;
-            try {
-                pixbuf = new Gdk.Pixbuf.from_file(file.get_path());
-            } catch (Error error) {
-                warning("Can't load picture %s - %s", file.get_path(), error.message);
-                Idle.add(load_from_file.callback);
-                return null;
-            }
-
-            pixbuf = pixbuf.apply_embedded_orientation();
-
-            image.load(pixbuf);
-
-            Idle.add(load_from_file.callback);
-            return image;
-        });
-        yield;
-        image = thread.join();
-        if (image == null) throw new Error(-1, 0, "Error loading image");
+        FixedRatioPicture image = new FixedRatioPicture() { min_width = 100, min_height = 100, max_width = MAX_WIDTH, max_height = MAX_HEIGHT, file = file };
 
         FileInfo file_info = file.query_info("*", FileQueryInfoFlags.NONE);
         string? mime_type = file_info.get_content_type();
diff --git a/main/src/ui/util/scaling_image.vala b/main/src/ui/util/scaling_image.vala
index 20ff6718..d6ca31fd 100644
--- a/main/src/ui/util/scaling_image.vala
+++ b/main/src/ui/util/scaling_image.vala
@@ -2,183 +2,130 @@ using Gdk;
 using Gtk;
 
 namespace Dino.Ui {
-class ScalingImage : Widget {
-    public int min_width { get; set; default = -1; }
-    public int target_width { get; set; default = -1; }
-    public int max_width { get; set; default = -1; }
-    public int min_height { get; set; default = -1; }
-    public int max_height { get; set; default = -1; }
-
-    private Pixbuf image;
-    private double image_ratio;
-    private int image_height = 0;
-    private int image_width = 0;
-    private int last_allocation_height = -1;
-    private int last_allocation_width = -1;
-    private int last_scale_factor = -1;
-    private Cairo.ImageSurface? cached_surface;
-    private static int8 use_image_surface = -1;
 
-    public void load(Pixbuf image) {
-        this.image = image;
-        this.image_ratio = ((double)image.height) / ((double)image.width);
-        this.image_height = image.height;
-        this.image_width = image.width;
-        queue_resize();
-    }
-
-    public override void dispose() {
-        base.dispose();
-        image = null;
-        cached_surface = null;
-    }
+class FixedRatioLayout : Gtk.LayoutManager {
+    public int min_width { get; set; default = 0; }
+    public int target_width { get; set; default = -1; }
+    public int max_width { get; set; default = int.MAX; }
+    public int min_height { get; set; default = 0; }
+    public int target_height { get; set; default = -1; }
+    public int max_height { get; set; default = int.MAX; }
 
-    private void calculate_size(ref double exact_width, ref double exact_height) {
-        if (exact_width == -1 && exact_height == -1) {
-            if (target_width == -1) {
-                exact_width = ((double)image_width) / ((double)scale_factor);
-                exact_height = ((double)image_height) / ((double)scale_factor);
-            } else {
-                exact_width = target_width;
-                exact_height = exact_width * image_ratio;
-            }
-        } else if (exact_width != -1) {
-            exact_height = exact_width * image_ratio;
-        } else if (exact_height != -1) {
-            exact_width = exact_height / image_ratio;
-        } else {
-            if (exact_width * image_ratio > exact_height + scale_factor) {
-                exact_width = exact_height / image_ratio;
-            } else if (exact_height / image_ratio > exact_width + scale_factor) {
-                exact_height = exact_width * image_ratio;
-            }
-        }
-        if (max_width != -1 && exact_width > max_width) {
-            exact_width = max_width;
-            exact_height = exact_width * image_ratio;
-        }
-        if (max_height != -1 && exact_height > max_height) {
-            exact_height = max_height;
-            exact_width = exact_height / image_ratio;
-        }
-        if (exact_width < min_width) exact_width = min_width;
-        if (exact_height < min_height) exact_height = min_height;
+    public FixedRatioLayout() {
+        this.notify.connect(layout_changed);
     }
 
-    public override void size_allocate(int width, int height, int baseline) {
-        if (max_width != -1) width = int.min(width, max_width);
-        if (max_height != -1) height = int.min(height, max_height);
-        height = int.max(height, min_height);
-        width = int.max(width, min_width);
-        double exact_width = width, exact_height = height;
-        calculate_size(ref exact_width, ref exact_height);
-        base.size_allocate(width, height, baseline);
-        if (last_allocation_height != height || last_allocation_width != width || last_scale_factor != scale_factor) {
-            last_allocation_height = height;
-            last_allocation_width = width;
-            last_scale_factor = scale_factor;
-            cached_surface = null;
+    private void measure_target_size(Gtk.Widget widget, out int width, out int height) {
+        if (target_width != -1 && target_height != -1) {
+            width = target_width;
+            height = target_height;
+            return;
         }
-    }
-
-    public override void snapshot(Gtk.Snapshot snapshot) {
-        Cairo.Context context = snapshot.append_cairo(Graphene.Rect.alloc().init(0, 0, get_allocated_width(), get_allocated_height()));
-        draw(context);
-    }
-
-    public bool draw(Cairo.Context ctx_in) {
-        if (image == null) return false;
-        Cairo.Context ctx = ctx_in;
-        int width = this.get_allocated_width(), height = this.get_allocated_height(), base_factor = 1;
-        if (use_image_surface == -1) {
-            // TODO: detect if we have to buffer in image surface
-            use_image_surface = 1;
+        Widget child;
+        width = min_width;
+        height = min_height;
+
+        child = widget.get_first_child();
+        while (child != null) {
+            if (child.should_layout()) {
+                int child_min = 0;
+                int child_nat = 0;
+                int child_min_baseline = -1;
+                int child_nat_baseline = -1;
+                child.measure(Orientation.HORIZONTAL, -1, out child_min, out child_nat, out child_min_baseline, out child_nat_baseline);
+                width = int.max(child_nat, width);
+            }
+            child = child.get_next_sibling();
         }
-        if (use_image_surface == 1) {
-            ctx_in.scale(1f / scale_factor, 1f / scale_factor);
-            if (cached_surface != null) {
-                ctx_in.set_source_surface(cached_surface, 0, 0);
-                ctx_in.paint();
-                ctx_in.set_source_rgb(0, 0, 0);
-                return true;
+        width = int.min(width, max_width);
+
+        child = widget.get_first_child();
+        while (child != null) {
+            if (child.should_layout()) {
+                int child_min = 0;
+                int child_nat = 0;
+                int child_min_baseline = -1;
+                int child_nat_baseline = -1;
+                child.measure(Orientation.VERTICAL, width, out child_min, out child_nat, out child_min_baseline, out child_nat_baseline);
+                height = int.max(child_nat, height);
             }
-            width *= scale_factor;
-            height *= scale_factor;
-            base_factor *= scale_factor;
-            cached_surface = new Cairo.ImageSurface(Cairo.Format.ARGB32, width, height);
-            ctx = new Cairo.Context(cached_surface);
+            child = child.get_next_sibling();
         }
 
-        double radius = 3 * base_factor;
-        double degrees = Math.PI / 180.0;
-        ctx.new_sub_path();
-        ctx.arc(width - radius, radius, radius, -90 * degrees, 0 * degrees);
-        ctx.arc(width - radius, height - radius, radius, 0 * degrees, 90 * degrees);
-        ctx.arc(radius, height - radius, radius, 90 * degrees, 180 * degrees);
-        ctx.arc(radius, radius, radius, 180 * degrees, 270 * degrees);
-        ctx.close_path();
-        ctx.clip();
-
-        Cairo.Surface buffer = sub_surface(ctx, width, height);
-        ctx.set_source_surface(buffer, 0, 0);
-        ctx.paint();
-
-        if (use_image_surface == 1) {
-            ctx_in.set_source_surface(ctx.get_target(), 0, 0);
-            ctx_in.paint();
-            ctx_in.set_source_rgb(0, 0, 0);
+        if (height > max_height) {
+            height = max_height;
+            width = min_width;
+
+            child = widget.get_first_child();
+            while (child != null) {
+                if (child.should_layout()) {
+                    int child_min = 0;
+                    int child_nat = 0;
+                    int child_min_baseline = -1;
+                    int child_nat_baseline = -1;
+                    child.measure(Orientation.HORIZONTAL, max_height, out child_min, out child_nat, out child_min_baseline, out child_nat_baseline);
+                    width = int.max(child_nat, width);
+                }
+                child = child.get_next_sibling();
+            }
+            width = int.min(width, max_width);
         }
-
-        return true;
     }
 
-    private Cairo.Surface sub_surface(Cairo.Context ctx, int width, int height) {
-        Cairo.Surface buffer = new Cairo.Surface.similar(ctx.get_target(), Cairo.Content.COLOR_ALPHA, width, height);
-        Cairo.Context bufctx = new Cairo.Context(buffer);
-        double w_scale = (double) width / image_width;
-        double h_scale = (double) height / image_height;
-        double scale = double.max(w_scale, h_scale);
-        bufctx.scale(scale, scale);
-
-        double x_off = 0, y_off = 0;
-        if (scale == h_scale) {
-            x_off = (width / scale - image_width) / 2.0;
+    public override void measure(Gtk.Widget widget, Orientation orientation, int for_size, out int minimum, out int natural, out int minimum_baseline, out int natural_baseline) {
+        minimum_baseline = -1;
+        natural_baseline = -1;
+        int width, height;
+        measure_target_size(widget, out width, out height);
+        if (orientation == Orientation.HORIZONTAL) {
+            minimum = min_width;
+            natural = width;
+        } else if (for_size == -1) {
+            minimum = min_height;
+            natural = height;
         } else {
-            y_off = (height / scale - image_height) / 2.0;
+            minimum = natural = height * for_size / width;
         }
-        Gdk.cairo_set_source_pixbuf(bufctx, image, 0, 0);
-        bufctx.get_source().set_filter(Cairo.Filter.BILINEAR);
-        bufctx.paint();
-        bufctx.set_source_rgb(0, 0, 0);
-        return buffer;
     }
 
-    public override void measure(Orientation orientation, int for_size, out int minimum, out int natural, out int minimum_baseline, out int natural_baseline) {
-        double natural_width = -1, natural_height = -1;
-        calculate_size(ref natural_width, ref natural_height);
-        if (orientation == Orientation.HORIZONTAL) {
-            natural = (int) Math.ceil(natural_width);
-        } else {
-            natural = (int) Math.ceil(natural_height);
-        }
-        if (for_size == -1) {
-            minimum = 0;
-        } else {
-            if (orientation == Orientation.HORIZONTAL) {
-                double exact_width = -1, exact_height = for_size;
-                calculate_size(ref exact_width, ref exact_height);
-                minimum = int.max((int)Math.floor(exact_width), min_width);
-            } else {
-                double exact_width = for_size, exact_height = -1;
-                calculate_size(ref exact_width, ref exact_height);
-                minimum = int.max((int)Math.floor(exact_height), min_height);
+    public override void allocate(Gtk.Widget widget, int width, int height, int baseline) {
+        Widget child = widget.get_first_child();
+        while (child != null) {
+            if (child.should_layout()) {
+                child.allocate(width, height, baseline, null);
             }
+            child = child.get_next_sibling();
         }
-        minimum_baseline = natural_baseline = -1;
     }
 
-    public override SizeRequestMode get_request_mode() {
+    public override SizeRequestMode get_request_mode(Gtk.Widget widget) {
         return SizeRequestMode.HEIGHT_FOR_WIDTH;
     }
 }
+
+class FixedRatioPicture : Gtk.Widget {
+    public int min_width { get { return layout.min_width; } set { layout.min_width = value; } }
+    public int target_width { get { return layout.target_width; } set { layout.target_width = value; } }
+    public int max_width { get { return layout.max_width; } set { layout.max_width = value; } }
+    public int min_height { get { return layout.min_height; } set { layout.min_height = value; } }
+    public int target_height { get { return layout.target_height; } set { layout.target_height = value; } }
+    public int max_height { get { return layout.max_height; } set { layout.max_height = value; } }
+    public File file { get { return inner.file; } set { inner.file = value; } }
+    public Gdk.Paintable paintable { get { return inner.paintable; } set { inner.paintable = value; } }
+#if GTK_4_8 && VALA_0_58
+    public Gtk.ContentFit content_fit { get { return inner.content_fit; } set { inner.content_fit = value; } }
+#endif
+    private Gtk.Picture inner = new Gtk.Picture();
+    private FixedRatioLayout layout = new FixedRatioLayout();
+
+    public FixedRatioPicture() {
+        layout_manager = layout;
+        inner.insert_after(this, null);
+    }
+
+    public override void dispose() {
+        inner.unparent();
+        base.dispose();
+    }
 }
+}
\ No newline at end of file