Imgui get up-to-date framebuffer size (#706)

* imgui get up-to-date framebuffer size

* lint

Author: almarklein

wgpu/utils/imgui/imgui_backend.py

@@ -377,7 +377,10 @@ def _update_vertex_buffer(self, draw_data: imgui.ImDrawData):
         )
 
     def render(
-        self, draw_data: imgui.ImDrawData, render_pass: wgpu.GPURenderPassEncoder
+        self,
+        draw_data: imgui.ImDrawData,
+        render_pass: wgpu.GPURenderPassEncoder,
+        psize: tuple,
     ):
         """
         Render the imgui draw data with the given render pass.
@@ -392,10 +395,7 @@ def render(
         if draw_data is None:
             return
 
-        display_width, display_height = draw_data.display_size
-        fb_width = int(display_width * draw_data.framebuffer_scale.x)
-        fb_height = int(display_height * draw_data.framebuffer_scale.y)
-
+        fb_width, fb_height = psize
         if fb_width <= 0 or fb_height <= 0 or draw_data.cmd_lists_count == 0:
             return
 

wgpu/utils/imgui/imgui_renderer.py

@@ -149,6 +149,7 @@ def render(self):
         draw_data = self._update_gui_function()
 
         pixel_ratio = self._canvas_context.canvas.get_pixel_ratio()
+        psize = self._canvas_context.canvas.get_physical_size()
         self._backend.io.display_framebuffer_scale = (pixel_ratio, pixel_ratio)
 
         command_encoder = self._backend._device.create_command_encoder()
@@ -164,7 +165,7 @@ def render(self):
                 }
             ],
         )
-        self._backend.render(draw_data, render_pass)
+        self._backend.render(draw_data, render_pass, psize)
         render_pass.end()
         self._backend._device.queue.submit([command_encoder.finish()])