Add new TextBlob class and text_shape example

Now we have TextBlob::Make() and TextBlob::MakeWithShaper() to
cache/store the shaped layout of a set of glyphs to be rendered with
draw_text(..., TextBlobRef, ...). We can also iterate clusters with
RunHandler.

There is still some work to be done for RTL text and composed
chars. And we should try to replace the old DrawTextDelegate with the
new TextBlob::RunHandler in the future.

cmake/FindSkia.cmake

@@ -228,6 +228,6 @@ add_library(skunicode INTERFACE)
 target_link_libraries(skunicode INTERFACE ${SKUNICODE_LIBRARY})
 
 add_library(skshaper INTERFACE)
-target_link_libraries(skshaper INTERFACE ${SKSHAPER_LIBRARY})
+target_link_libraries(skshaper INTERFACE ${SKSHAPER_LIBRARY} skunicode)
 target_compile_definitions(skshaper INTERFACE
   SK_SHAPER_HARFBUZZ_AVAILABLE)

examples/CMakeLists.txt

@@ -1,19 +1,20 @@
 # LAF OS
 # Copyright (C) 2019-2024  Igara Studio S.A.
 
-if(LAF_BACKEND STREQUAL "skia")
-  function(laf_add_example name console="")
-    if("${console}" STREQUAL "CONSOLE")
-      add_executable(${name} ${name}.cpp)
-    else()
-      add_executable(${name} WIN32 ${name}.cpp)
-    endif()
-    target_link_libraries(${name} laf-os laf-text)
-    set_target_properties(${name} PROPERTIES LINK_FLAGS "${LAF_BACKEND_LINK_FLAGS}")
-  endfunction()
+function(laf_add_example name console="")
+  if("${console}" STREQUAL "CONSOLE")
+    add_executable(${name} ${name}.cpp)
+  else()
+    add_executable(${name} WIN32 ${name}.cpp)
+  endif()
+  target_link_libraries(${name} laf-os laf-text)
+  set_target_properties(${name} PROPERTIES LINK_FLAGS "${LAF_BACKEND_LINK_FLAGS}")
+endfunction()
 
+laf_add_example(base64 CONSOLE)
+laf_add_example(show_platform CONSOLE)
+if(LAF_BACKEND STREQUAL "skia")
   laf_add_example(allevents GUI)
-  laf_add_example(base64 CONSOLE)
   laf_add_example(complextextlayout GUI)
   laf_add_example(custom_window GUI)
   laf_add_example(floating_window GUI)
@@ -23,5 +24,5 @@ if(LAF_BACKEND STREQUAL "skia")
   laf_add_example(multiple_windows GUI)
   laf_add_example(panviewport GUI)
   laf_add_example(shader GUI)
-  laf_add_example(show_platform CONSOLE)
+  laf_add_example(text_shape GUI)
 endif()

examples/complextextlayout.cpp

@@ -62,7 +62,7 @@ void draw_window(Window* window,
                           "👍❤️😂☺️😯😢😡" }; // Emojis
 
   MyDrawTextDelegate delegate(mousePos);
-  gfx::Point pos(0, 0);
+  gfx::PointF pos(0, 0);
   for (auto line : lines) {
     std::string s = line;
     draw_text_with_shaper(
@@ -110,13 +110,9 @@ int app_main(int argc, char* argv[])
       redraw = false;
       draw_window(window.get(), fontMgr, font, mousePos);
     }
-    // Wait for an event in the queue, the "true" parameter indicates
-    // that we'll wait for a new event, and the next line will not be
-    // processed until we receive a new event. If we use "false" and
-    // there is no events in the queue, we receive an "ev.type() == Event::None
+
     Event ev;
     queue->getEvent(ev);
-
     switch (ev.type()) {
 
       case Event::CloseWindow:

examples/custom_window.cpp

@@ -127,7 +127,7 @@ void draw_window(Window* window,
 
     p.color(kTitleBarText);
     draw_text(surface, nullptr, "Custom Window",
-                  rc2.center(), &p, TextAlign::Center);
+              rc2.center(), &p, TextAlign::Center);
 
     // Draw buttons
     draw_button(surface, rc.x2()-kButtonSize, Hit::CloseButton, hit);
@@ -151,13 +151,13 @@ void draw_window(Window* window,
   p.style(Paint::Style::Fill);
   p.color(kContentText);
   draw_text(surface, font, "Content Rect",
-                rc2.center(), &p, TextAlign::Center);
+            rc2.center(), &p, TextAlign::Center);
 
   if (window->isFullscreen()) {
     auto pos = rc2.center();
     pos.y += 24;
     draw_text(surface, font, "(F key or F11 to exit full screen)",
-                  pos, &p, TextAlign::Center);
+              pos, &p, TextAlign::Center);
   }
 
   if (window->isVisible())