bananatools/gfxhook/gfx.c

#include <windows.h>

#include <assert.h>
#include <stdlib.h>

#include "gfxhook/gfx.h"

#include "hook/table.h"

#include "util/dprintf.h"

typedef BOOL (WINAPI *ShowWindow_t)(HWND hWnd, int nCmdShow);
typedef HWND (WINAPI *CreateWindowExA_t)(
    DWORD dwExStyle, 
    LPCSTR lpClassName, 
    LPCSTR lpWindowName, 
    DWORD dwStyle, 
    int X, 
    int Y, 
    int nWidth, 
    int nHeight,
    HWND hWndParent, 
    HMENU hMenu, 
    HINSTANCE hInstance, 
    LPVOID lpParam
);
typedef HWND (WINAPI *CreateWindowExW_t)(
    DWORD dwExStyle, 
    LPCWSTR lpClassName, 
    LPCWSTR lpWindowName, 
    DWORD dwStyle, 
    int X, 
    int Y, 
    int nWidth, 
    int nHeight,
    HWND hWndParent, 
    HMENU hMenu, 
    HINSTANCE hInstance, 
    LPVOID lpParam
);

static BOOL WINAPI hook_ShowWindow(HWND hWnd, int nCmdShow);
static HWND WINAPI hook_CreateWindowExA(
    DWORD dwExStyle, 
    LPCSTR lpClassName, 
    LPCSTR lpWindowName, 
    DWORD dwStyle, 
    int X, 
    int Y, 
    int nWidth, 
    int nHeight,
    HWND hWndParent, 
    HMENU hMenu, 
    HINSTANCE hInstance, 
    LPVOID lpParam
);
static HWND WINAPI hook_CreateWindowExW(
    DWORD dwExStyle, 
    LPCWSTR lpClassName, 
    LPCWSTR lpWindowName, 
    DWORD dwStyle, 
    int X, 
    int Y, 
    int nWidth, 
    int nHeight,
    HWND hWndParent, 
    HMENU hMenu, 
    HINSTANCE hInstance, 
    LPVOID lpParam
);

static struct gfx_config gfx_config;
static ShowWindow_t next_ShowWindow;
static CreateWindowExA_t next_CreateWindowExA;
static CreateWindowExW_t next_CreateWindowExW;

static const struct hook_symbol gfx_hooks[] = {
    {
        .name = "ShowWindow",
        .patch = hook_ShowWindow,
        .link = (void **) &next_ShowWindow,
    },
    {
        .name = "CreateWindowExA",
        .patch = hook_CreateWindowExA,
        .link = (void **) &next_CreateWindowExA,
    },
    {
        .name = "CreateWindowExW",
        .patch = hook_CreateWindowExW,
        .link = (void **) &next_CreateWindowExW,
    },
};

void gfx_hook_init(const struct gfx_config *cfg)
{
    assert(cfg != NULL);

    if (!cfg->enable) {
        return;
    }

    memcpy(&gfx_config, cfg, sizeof(*cfg));
    hook_table_apply(NULL, "user32.dll", gfx_hooks, _countof(gfx_hooks));
}

static BOOL WINAPI hook_ShowWindow(HWND hWnd, int nCmdShow)
{
    dprintf("Gfx: ShowWindow hook hit\n");

    if (!gfx_config.framed && nCmdShow == SW_RESTORE) {
        nCmdShow = SW_SHOW;
    }

    return next_ShowWindow(hWnd, nCmdShow);
}

static HWND WINAPI hook_CreateWindowExA(
    DWORD dwExStyle, 
    LPCSTR lpClassName, 
    LPCSTR lpWindowName, 
    DWORD dwStyle, 
    int X, 
    int Y, 
    int nWidth, 
    int nHeight,
    HWND hWndParent, 
    HMENU hMenu, 
    HINSTANCE hInstance, 
    LPVOID lpParam
)
{
    dprintf("Gfx: CreateWindowExA hook hit\n");
    DWORD windowStyle = 0;

    windowStyle = WS_VISIBLE | WS_POPUP | WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX | WS_MAXIMIZEBOX;
        
    return next_CreateWindowExA(dwExStyle, lpClassName, lpWindowName, windowStyle, X, Y, nWidth, nHeight, hWndParent, hMenu, hInstance, lpParam);
}

static HWND WINAPI hook_CreateWindowExW(
    DWORD dwExStyle, 
    LPCWSTR lpClassName, 
    LPCWSTR lpWindowName, 
    DWORD dwStyle, 
    int X, 
    int Y, 
    int nWidth, 
    int nHeight,
    HWND hWndParent, 
    HMENU hMenu, 
    HINSTANCE hInstance, 
    LPVOID lpParam
)
{
    dprintf("Gfx: CreateWindowExW hook hit\n");
    DWORD windowStyle = 0;

    windowStyle = WS_VISIBLE | WS_POPUP | WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX | WS_MAXIMIZEBOX;
        
    return next_CreateWindowExW(dwExStyle, lpClassName, lpWindowName, windowStyle, X, Y, nWidth, nHeight, hWndParent, hMenu, hInstance, lpParam);
}