Add canvas UI node

src/graphics/ui/elements/Canvas.cpp

@@ -0,0 +1,19 @@
+#include "Canvas.hpp"
+
+#include "graphics/core/Batch2D.hpp"
+#include "graphics/core/DrawContext.hpp"
+#include "graphics/core/Texture.hpp"
+
+gui::Canvas::Canvas(ImageFormat inFormat, glm::uvec2 inSize) : UINode(inSize) {
+    ImageData data {inFormat, inSize.x, inSize.y};
+    mTexture = Texture::from(&data);
+}
+
+void gui::Canvas::draw(const DrawContext& pctx, const Assets& assets) {
+    auto pos = calcPos();
+    auto col = calcColor();
+
+    auto batch = pctx.getBatch2D();
+    batch->texture(mTexture.get());
+    batch->rect(pos.x, pos.y, size.x, size.y, 0, 0, 0, {}, false, true, col);
+}

src/graphics/ui/elements/Canvas.hpp

@@ -0,0 +1,25 @@
+#pragma once
+
+#include "UINode.hpp"
+#include "graphics/core/ImageData.hpp"
+#include "graphics/core/Texture.hpp"
+
+class Texture;
+
+namespace gui {
+    class Canvas final : public UINode {
+    public:
+        explicit Canvas(ImageFormat inFormat, glm::uvec2 inSize);
+
+        ~Canvas() override = default;
+
+        void draw(const DrawContext& pctx, const Assets& assets) override;
+
+        [[nodiscard]] std::shared_ptr<::Texture> texture() const {
+            return mTexture;
+        }
+    private:
+        std::shared_ptr<::Texture> mTexture;
+        std::unique_ptr<ImageData> mData;
+    };
+}

src/graphics/ui/gui_xml.cpp

@@ -4,6 +4,7 @@
 #include "elements/Image.hpp"
 #include "elements/Menu.hpp"
 #include "elements/Button.hpp"
+#include "elements/Canvas.hpp"
 #include "elements/CheckBox.hpp"
 #include "elements/TextBox.hpp"
 #include "elements/TrackBar.hpp"
@@ -455,6 +456,18 @@ static std::shared_ptr<UINode> readImage(
     return image;
 }
 
+static std::shared_ptr<UINode> readCanvas(
+    const UiXmlReader& reader, const xml::xmlelement& element
+) {
+    auto size = glm::uvec2{32, 32};
+    if (element.has("size")) {
+        size = element.attr("size").asVec2();
+    }
+    auto image = std::make_shared<Canvas>(ImageFormat::rgba8888, size);
+    _readUINode(reader, element, *image);
+    return image;
+}
+
 static std::shared_ptr<UINode> readTrackBar(
     const UiXmlReader& reader, const xml::xmlelement& element
 ) {
@@ -634,6 +647,7 @@ static std::shared_ptr<UINode> readPageBox(UiXmlReader& reader, const xml::xmlel
 UiXmlReader::UiXmlReader(const scriptenv& env) : env(env) {
     contextStack.emplace("");
     add("image", readImage);
+    add("canvas", readCanvas);
     add("label", readLabel);
     add("panel", readPanel);
     add("button", readButton);