fromScratch — Phase 1–3 Task List

Phase 1: Project Skeleton & Desktop Window

Build System

• Rewrite root CMakeLists.txt for modular multi-directory structure (MinGW, C++23, Qt 6.3)
• Create engine/CMakeLists.txt (pure C++ static lib)
• Create renderer/CMakeLists.txt (forwarding)
• Create renderer/qt/CMakeLists.txt (Qt renderer lib)
• Create app/CMakeLists.txt (executable)
• Create tests/CMakeLists.txt (unit tests)

Engine Core Types

• engine/core/types.h — Color, Rect, Point, Size, EdgeSizes, FontSpec
• engine/core/types.cpp — helper methods

Graphics Abstraction

• engine/graphics/renderer.h — abstract Renderer interface
• engine/graphics/display_list.h — PaintCommand + DisplayList
• engine/graphics/display_list.cpp — implementation

Qt Renderer Backend

• renderer/qt/qt_renderer.h — QtRenderer header
• renderer/qt/qt_renderer.cpp — QPainter implementation
• renderer/qt/render_widget.h — RenderWidget header
• renderer/qt/render_widget.cpp — custom QWidget paint surface

Browser Window

• Restructure app/main.cpp
• app/ui/main_window.h — MainWindow header (toolbar, tabs, address bar)
• app/ui/main_window.cpp — MainWindow implementation
• Remove old mainwindow.h, mainwindow.cpp, mainwindow.ui

Phase 2: Graphics Primitives

• Complete QtRenderer: fillRect, strokeRect, drawText, drawLine, drawImage, clip
• app/ui/demo_page.h — demo display list generator
• app/ui/demo_page.cpp — renders colored rects, text, lines

Phase 3: HTML Tokenizer

• engine/html/token.h — Token types
• engine/html/tokenizer.h — Tokenizer header
• engine/html/tokenizer.cpp — WHATWG state machine (~20 states)
• tests/test_tokenizer.cpp — unit tests
• Build & verify all tests pass