Add ImColor helper. Increase flexibility of the color API

In most of the places it's now possible to provide a simple int value, instead of float numbers.

imgui-binding/src/main/java/imgui/ImColor.java

@@ -0,0 +1,48 @@
+package imgui;
+
+/**
+ * Helper class to get ABGR packed color used by Dear ImGui.
+ */
+public final class ImColor {
+    private ImColor() {
+    }
+
+    public static int get32(final int r, final int g, final int b, final int a) {
+        return a << 24 | b << 16 | g << 8 | r;
+    }
+
+    public static int get32(final int r, final int g, final int b) {
+        return get32(r, g, b, 255);
+    }
+
+    public static int get32(final float r, final float g, final float b, final float a) {
+        return get32((int) (r * 255), (int) (g * 255), (int) (b * 255), (int) (a * 255));
+    }
+
+    public static int get32(final float r, final float g, final float b) {
+        return get32(r, g, b, 1f);
+    }
+
+    /**
+     * @param hex e.g. "#FFFFFF"
+     */
+    public static int get32RGBHex(final String hex) {
+        return get32(
+            Integer.parseInt(hex.substring(1, 3), 16),
+            Integer.parseInt(hex.substring(3, 5), 16),
+            Integer.parseInt(hex.substring(5, 7), 16)
+        );
+    }
+
+    /**
+     * @param hex e.g. "#FFFFFFFF"
+     */
+    public static int get32RGBAHex(final String hex) {
+        return get32(
+            Integer.parseInt(hex.substring(1, 3), 16),
+            Integer.parseInt(hex.substring(3, 5), 16),
+            Integer.parseInt(hex.substring(5, 7), 16),
+            Integer.parseInt(hex.substring(7, 9), 16)
+        );
+    }
+}

imgui-binding/src/main/java/imgui/ImGui.java

@@ -877,12 +877,16 @@ public final class ImGui {
         ImGui::PopFont();
     */
 
-    public static native void pushStyleColor(int imGuiCol, int col); /*
-        ImGui::PushStyleColor(imGuiCol, col);
+    public static native void pushStyleColor(int imGuiCol, float r, float g, float b, float a); /*
+        ImGui::PushStyleColor(imGuiCol, (ImU32)ImColor(r, g, b, a));
     */
 
-    public static native void pushStyleColor(int imGuiCol, float r, float g, float b, float a); /*
-        ImGui::PushStyleColor(imGuiCol, ImVec4(r, g, b, a));
+    public static native void pushStyleColor(int imGuiCol, int r, int g, int b, int a); /*
+        ImGui::PushStyleColor(imGuiCol, (ImU32)ImColor(r, g, b, a));
+    */
+
+    public static native void pushStyleColor(int imGuiCol, int col); /*
+        ImGui::PushStyleColor(imGuiCol, col);
     */
 
     public static native void popStyleColor(); /*
@@ -1325,7 +1329,21 @@ public final class ImGui {
      * Shortcut for PushStyleColor(ImGuiCol_Text, col); Text(fmt, ...); PopStyleColor();
      */
     public static native void textColored(float r, float g, float b, float a, String text); /*
-        ImGui::TextColored(ImVec4(r, g, b, a), text, NULL);
+        ImGui::TextColored(ImColor(r, g, b, a), text, NULL);
+    */
+
+    /**
+     * Shortcut for PushStyleColor(ImGuiCol_Text, col); Text(fmt, ...); PopStyleColor();
+     */
+    public static native void textColored(int r, int g, int b, int a, String text); /*
+        ImGui::TextColored(ImColor(r, g, b, a), text, NULL);
+    */
+
+    /**
+     * Shortcut for PushStyleColor(ImGuiCol_Text, col); Text(fmt, ...); PopStyleColor();
+     */
+    public static native void textColored(int col, String text); /*
+        ImGui::TextColored(ImColor(col), text, NULL);
     */
 
     /**

imgui-binding/src/main/java/imgui/ImGuiStyle.java

@@ -602,7 +602,15 @@ public final class ImGuiStyle implements ImGuiDestroyableStruct {
     */
 
     public native void setColor(int imGuiCol, float r, float g, float b, float a); /*
-        IMGUI_STYLE->Colors[imGuiCol] = ImVec4(r, g, b, a);
+        IMGUI_STYLE->Colors[imGuiCol] = ImColor(r, g, b, a);
+    */
+
+    public native void setColor(int imGuiCol, int r, int g, int b, int a); /*
+        IMGUI_STYLE->Colors[imGuiCol] = ImColor(r, g, b, a);
+    */
+
+    public native void setColor(int imGuiCol, int col); /*
+        IMGUI_STYLE->Colors[imGuiCol] = ImColor(col);
     */
 
     public native void scaleAllSizes(float scaleFactor); /*