From 317f4dec1c429ac1e2c24f0aae250e7a0f354bcd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E6=A2=A6=E5=AE=87?= <xtiqin@163.com>
Date: Tue, 20 Oct 2020 11:06:48 +0800
Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A0Cairo=E4=BD=BF=E7=94=A8?=
 =?UTF-8?q?=E6=96=87=E5=AD=97=E7=9A=84=E4=BE=8B=E5=AD=90?=
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---
 L07CairoCircle/main.c       |  3 +-
 L07CairoText/CMakeLists.txt | 22 +++++++++++++++
 L07CairoText/main.c         | 55 +++++++++++++++++++++++++++++++++++++
 3 files changed, 78 insertions(+), 2 deletions(-)
 create mode 100644 L07CairoText/CMakeLists.txt
 create mode 100644 L07CairoText/main.c

diff --git a/L07CairoCircle/main.c b/L07CairoCircle/main.c
index 40c0461..0517ab4 100644
--- a/L07CairoCircle/main.c
+++ b/L07CairoCircle/main.c
@@ -16,7 +16,6 @@ void draw(cairo_surface_t *cairosurf) {
 int main(int argc, char *argv[]) {
     SDL_Surface *screen; // even with SDL2, we can still bring ancient code back
     SDL_Window *window;
-    SDL_Surface *image;
 
     SDL_Init(SDL_INIT_VIDEO); // init video
 
@@ -24,7 +23,7 @@ int main(int argc, char *argv[]) {
     window = SDL_CreateWindow(
             "Draw on surface",
             SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
-            550, 400, SDL_WINDOW_OPENGL
+            550, 400, SDL_WINDOW_SHOWN
     );
 
     // but instead of creating a renderer, we can draw directly to the screen
diff --git a/L07CairoText/CMakeLists.txt b/L07CairoText/CMakeLists.txt
new file mode 100644
index 0000000..5aea9f4
--- /dev/null
+++ b/L07CairoText/CMakeLists.txt
@@ -0,0 +1,22 @@
+cmake_minimum_required(VERSION 3.17)
+project(L07CairoCircle)
+
+set(CMAKE_CXX_STANDARD 14)
+
+add_compile_definitions(THREAD_SAFE)
+
+include_directories(
+        /usr/local/include/SDL2
+        /usr/local/include/cairo
+)
+
+link_directories(
+        /usr/local/lib
+)
+
+link_libraries(
+        SDL2
+        cairo
+)
+
+add_executable(L07CairoCircle main.c)
\ No newline at end of file
diff --git a/L07CairoText/main.c b/L07CairoText/main.c
new file mode 100644
index 0000000..5057de7
--- /dev/null
+++ b/L07CairoText/main.c
@@ -0,0 +1,55 @@
+#include <SDL.h> // include SDL header
+#include <cairo.h>
+
+
+#define FONT_SIZE 50
+
+void draw(cairo_surface_t *cairosurf) {
+    cairo_t *cr = cairo_create(cairosurf);
+
+    cairo_set_font_size(cr, FONT_SIZE);
+    cairo_move_to(cr, 0, FONT_SIZE);
+    cairo_show_text(cr, "Hello Cairo");
+
+    cairo_destroy(cr);
+}
+
+int main(int argc, char *argv[]) {
+    SDL_Surface *screen; // even with SDL2, we can still bring ancient code back
+    SDL_Window *window;
+
+    SDL_Init(SDL_INIT_VIDEO); // init video
+
+    // create the window like normal
+    window = SDL_CreateWindow(
+            "Draw on surface",
+            SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
+            550, 400, SDL_WINDOW_SHOWN
+    );
+
+    // but instead of creating a renderer, we can draw directly to the screen
+    screen = SDL_GetWindowSurface(window);
+    cairo_surface_t *cairosurf = cairo_image_surface_create_for_data(
+            screen->pixels, CAIRO_FORMAT_RGB24,
+            screen->w, screen->h, screen->pitch
+    );
+
+    while (1) {
+        // fill background
+        SDL_FillRect(screen, NULL, 0xffffffff);
+        draw(cairosurf);
+        SDL_UpdateWindowSurface(window);
+
+        SDL_Event event;
+        if (SDL_PollEvent(&event)) {
+            if (event.type == SDL_QUIT) {
+                break;
+            }
+        }
+    }
+
+    cairo_surface_destroy(cairosurf);
+    SDL_DestroyWindow(window);
+    SDL_Quit();
+    return 0;
+}