diff --git a/sww/source/platform/fb.c b/sww/source/platform/fb.c
index e773045..3ece5ab 100644
--- a/sww/source/platform/fb.c
+++ b/sww/source/platform/fb.c
@@ -318,6 +318,9 @@ void swwApp_Initialize()
         exit(4);
     }
 
+    g_app.xres = vinfo.xres;
+    g_app.yres = vinfo.yres;
+
     g_app.fb = (uint8_t*)mmap(0, g_app.xres * g_app.yres * 4, PROT_READ | PROT_WRITE, MAP_SHARED,
                               g_app.fbfd, 0);
     if (g_app.fb == (void*)-1) {
@@ -325,9 +328,6 @@ void swwApp_Initialize()
         exit(5);
     }
 
-    g_app.xres = vinfo.xres;
-    g_app.yres = vinfo.yres;
-
     int events[EVENT_SOURCE_MAX_SIZE] = {-1};
     int num = ScanDevices(events, EVENT_SOURCE_MAX_SIZE);
 
@@ -431,7 +431,8 @@ void swwWindow_Present(swwWindow* o)
     /* Start position: <fb4pixels>[y][x] */
     uint8_t* start = g_app.fb + (((o->y * g_app.xres) + o->x) << 2);
     uint8_t* buf = o->surface->buffer;
-    size_t line_size = o->o->surface->width << 2;
+    size_t line_size = o->surface->width << 2;
+    int height = (int)o->surface->height;
 
     // VSYNC
     int zero = 0;
@@ -442,7 +443,7 @@ void swwWindow_Present(swwWindow* o)
     }
 
     /* Copy the window buffer to framebuffer line by line */
-    for (; i < o->height; ++i, start += (g_app.xres << 2), buf += line_size) {
+    for (; i < height; ++i, start += (g_app.xres << 2), buf += line_size) {
         memcpy(start, buf, line_size);
     }
 }
diff --git a/sww/test/canvas_wave.c b/sww/test/canvas_wave.c
index bdfe40c..97a701f 100644
--- a/sww/test/canvas_wave.c
+++ b/sww/test/canvas_wave.c
@@ -190,14 +190,13 @@ void CanvasWave(swwWindow* o)
 
 int main(int argc, char* argv[])
 {
-    uint32_t w, h;
+    uint32_t w = 512, h = 512;
 
     swwWindowCallback callback = {OnKey, OnButton, OnScroll};
     swwFpsHelper fps;
     swwApp_Initialize();
 
     swwWindow* window = swwWindow_Create(TITLE, w, h);
-    swwWindow_GetSize(window, &w, &h);
     UserData ud = {w, h, NULL};
     ud.renderer = swwRenderer_CreateAttachWindow(window, kSoftwareRenderer);
     swwWindow_SetUserData(window, &ud);
diff --git a/sww/test/image_viewer.c b/sww/test/image_viewer.c
index 95de70f..050cdba 100644
--- a/sww/test/image_viewer.c
+++ b/sww/test/image_viewer.c
@@ -51,9 +51,7 @@ void OnScroll(swwWindow* o, float offset)
 int main(int argc, char *argv[])
 {
     uint32_t img_w, img_h;
-    uint32_t w, h;
 
-    // TODO: Read the image file, get the width and height
     swwTexture* qrcode_tex = swwTexture_LoadFromFile("qrcode.png");
     swwTexture_GetSize(qrcode_tex, &img_w, &img_h);
 
@@ -62,16 +60,12 @@ int main(int argc, char *argv[])
     swwApp_Initialize();
 
     swwWindow* window = swwWindow_Create(TITLE, img_w, img_h);
-    swwWindow_GetSize(window, &w, &h);
-    UserData ud = {w, h, NULL};
+    UserData ud = {img_w, img_h, NULL};
     ud.renderer = swwRenderer_CreateAttachWindow(window, kSoftwareRenderer);
     swwWindow_SetUserData(window, &ud);
 
     swwWindow_SetCallback(window, &callback);
 
-    int ww2 = (w - img_w) / 2;
-    int hh2 = (h - img_h) / 2;
-
     swwRateHelper rh;
 
     swwRenderer_EnablePerfMonitor(ud.renderer, 1);
@@ -81,7 +75,7 @@ int main(int argc, char *argv[])
     while (!swwApp_ShouldExit()) {
         swwRenderer_ClearBlack(ud.renderer);
 
-        swwRenderer_DrawTexture(ud.renderer, qrcode_tex, (Point2i){ww2, hh2});
+        swwRenderer_DrawTexture(ud.renderer, qrcode_tex, (Point2i){0, 0});
 
         if (swwFpsHelper_Update(&fps, ud.renderer)) {
             swwFpsHelper_SetTitleWithFps(&fps, window, TITLE);
diff --git a/sww/test/shapes.c b/sww/test/shapes.c
index 5e38be7..1a0669c 100644
--- a/sww/test/shapes.c
+++ b/sww/test/shapes.c
@@ -130,8 +130,7 @@ void HideSphere(swwRenderer* o, int cx, int cy, float r, int alpha, int beta, in
 
 int main()
 {
-    int w, h;
-    int ow = 512, oh = 512;
+    int w = 512, h = 512;
     int cw, ch;
     swwRateHelper rh;
     swwFpsHelper fps;
@@ -139,8 +138,7 @@ int main()
     swwWindowCallback callback = {OnKey, OnButton, OnScroll};
     swwApp_Initialize();
 
-    swwWindow* window = swwWindow_Create(TITLE, ow, oh);
-    swwWindow_GetSize(window, &w, &h);
+    swwWindow* window = swwWindow_Create(TITLE, w, h);
     UserData ud = {w, h, 0, NULL};
     ud.renderer = swwRenderer_CreateAttachWindow(window, kSoftwareRenderer);
     swwWindow_SetUserData(window, &ud);
@@ -150,10 +148,9 @@ int main()
     cw = w / 2;
     ch = h / 2;
 
-    int x = 320, y = 240; // 初始位置
-    int dx = 2, dy = 2;   // 初始速度
+    int x = 320, y = 240;
+    int dx = 2, dy = 2;
 
-    // 小球半径
     int radius = 100;
     int alpha = 45;
     int beta = 30;
@@ -195,22 +192,21 @@ int main()
             swwRenderer_DrawLine(ud.renderer, (Point2i){20, 120}, (Point2i){200, 120}, kOrange);
         } break;
         case 7: {
-            // 绘制小球
             HideSphere(ud.renderer, x, y, radius, alpha, beta, 1, ball_c);
-            // 移动小球
+
             x += dx;
             y += dy;
+
             alpha = x;
             beta = y;
 
-            // 碰撞检测
             if (x + radius >= ud.w || x - radius <= 0) {
-                dx = -dx; // 水平方向反弹
+                dx = -dx;
                 ball_c = Color_RandomRGB;
             }
 
             if (y + radius >= ud.h || y - radius <= 0) {
-                dy = -dy; // 垂直方向反弹
+                dy = -dy;
                 ball_c = Color_RandomRGB;
             }
         } break;
@@ -218,8 +214,8 @@ int main()
             const int n = 12;
             for (float f = 0; f < 2 * M_PI; f += 2 * M_PI / n) {
                 for (float g = 0; g < 2 * M_PI; g += 2 * M_PI / n) {
-                    Point2i begin = {(sinf(f) + 1) * ow * 0.5, (cosf(f) + 1) * oh * 0.5};
-                    Point2i end = {(sinf(g) + 1) * ow * 0.5, (cosf(g) + 1) * oh * 0.5};
+                    Point2i begin = {(sinf(f) + 1) * w * 0.5, (cosf(f) + 1) * h * 0.5};
+                    Point2i end = {(sinf(g) + 1) * w * 0.5, (cosf(g) + 1) * h * 0.5};
                     swwRenderer_DrawLine(ud.renderer, begin, end, kOrange);
                 }
             }
diff --git a/sww/test/starfield.c b/sww/test/starfield.c
index 9fad8e1..32fb98d 100644
--- a/sww/test/starfield.c
+++ b/sww/test/starfield.c
@@ -75,8 +75,7 @@ typedef struct
 
 int main()
 {
-    const uint32_t win_w = 512, win_h = 512;
-    uint32_t w, h;
+    const uint32_t w = 512, h = 512;
     uint32_t img_w, img_h;
     int cw, ch;
     swwWindowCallback callback = {OnKey, OnButton, OnScroll};
@@ -84,17 +83,13 @@ int main()
     swwRateHelper rh;
     swwApp_Initialize();
 
-    swwWindow* window = swwWindow_Create(TITLE, win_w, win_h);
-    swwWindow_GetSize(window, &w, &h);
+    swwWindow* window = swwWindow_Create(TITLE, w, h);
     UserData ud = {w, h, 0, NULL};
     ud.renderer = swwRenderer_CreateAttachWindow(window, kSoftwareRenderer);
     swwWindow_SetUserData(window, &ud);
 
     swwWindow_SetCallback(window, &callback);
 
-    int ww2 = (w - win_w) / 2;
-    int hh2 = (h - win_h) / 2;
-
     const int center_x = w / 2;
     const int center_y = h / 2;
 
diff --git a/sww/test/texture.c b/sww/test/texture.c
index 23f32d1..af5d7d3 100644
--- a/sww/test/texture.c
+++ b/sww/test/texture.c
@@ -84,24 +84,22 @@ int CompareDepth(const void* a, const void* b)
 
 int main()
 {
-    const uint32_t win_w = 512, win_h = 512;
-    uint32_t w, h;
+    uint32_t w = 512, h = 512;
     uint32_t img_w, img_h;
     int cw, ch;
     swwWindowCallback callback = {OnKey, OnButton, OnScroll};
     swwFpsHelper fps;
     swwApp_Initialize();
 
-    swwWindow* window = swwWindow_Create(TITLE, win_w, win_h);
-    swwWindow_GetSize(window, &w, &h);
+    swwWindow* window = swwWindow_Create(TITLE, w, h);
     UserData ud = {w, h, 0, NULL};
     ud.renderer = swwRenderer_CreateAttachWindow(window, kSoftwareRenderer);
     swwWindow_SetUserData(window, &ud);
 
     swwWindow_SetCallback(window, &callback);
 
-    int ww2 = (w - win_w) / 2;
-    int hh2 = (h - win_h) / 2;
+    int ww2 = w / 2;
+    int hh2 = h / 2;
 
     const int center_x = w / 2;
     const int center_y = h / 2;
@@ -161,7 +159,6 @@ int main()
             const float cos_theta = cos(angle);
             const float sin_theta = sin(angle);
 
-            // 计算列变换（带缩放因子）
             int valid_columns = 0;
             uint32_t x = 0;
             for (; x < img_w; x++) {
@@ -186,10 +183,9 @@ int main()
 
             qsort(columns, valid_columns, sizeof(ColumnInfo), CompareDepth);
 
-            // 改进的渲染逻辑
             for (int i = 0; i < valid_columns; i++) {
                 const ColumnInfo* col = &columns[i];
-                if (col->screen_x < 0 || col->screen_x >= win_w)
+                if (col->screen_x < 0 || col->screen_x >= w)
                     continue;
 
                 // 计算垂直缩放范围
@@ -199,7 +195,7 @@ int main()
 
                 int sy = y_start;
                 for (; sy < y_end; sy++) {
-                    if (sy < 0 || sy >= win_h)
+                    if (sy < 0 || sy >= h)
                         continue;
 
                     // 逆向计算原始Y坐标（带抗锯齿）