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/*==========================================================================
*
* Copyright (C) 1995-1996 Microsoft Corporation. All Rights Reserved.
*
* File: ddutil.cpp
* Content: Routines for loading bitmap and palettes from resources
*
***************************************************************************/
#undef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <stdio.h>
#include <windowsx.h>
#include <ddraw.h>
#include "ddutil.h"
//创建一个页面，并加载一个bmp图片
extern "C" IDirectDrawSurface * DDLoadBitmap(IDirectDraw *pdd, LPCSTR szBitmap, int dx, int dy)
{
HBITMAP hbm;
BITMAP bm;
DDSURFACEDESC ddsd;
IDirectDrawSurface *pdds;
//当一个资源
hbm = (HBITMAP)LoadImage(GetModuleHandle(NULL), szBitmap, IMAGE_BITMAP, dx, dy,
LR_CREATEDIBSECTION);
//失败，当一个文件
if (hbm == NULL)
hbm = (HBITMAP)LoadImage(NULL, szBitmap, IMAGE_BITMAP, dx, dy,
LR_LOADFROMFILE|LR_CREATEDIBSECTION);
if (hbm == NULL)
return NULL;
//得到图片大小
GetObject(hbm, sizeof(bm), &bm);
//创建页面
ZeroMemory(&ddsd, sizeof(ddsd));
ddsd.dwSize = sizeof(ddsd);
ddsd.dwFlags = DDSD_CAPS | DDSD_HEIGHT |DDSD_WIDTH;
ddsd.ddsCaps.dwCaps = DDSCAPS_OFFSCREENPLAIN;
ddsd.dwWidth = bm.bmWidth;
ddsd.dwHeight = bm.bmHeight;
if (pdd->CreateSurface(&ddsd, &pdds, NULL) != DD_OK)
return NULL;
//加载图片
DDCopyBitmap(pdds, hbm, 0, 0, 0, 0);
DeleteObject(hbm);
return pdds;
}
//显示一个bmp到一个页面
HRESULT DDReLoadBitmap(IDirectDrawSurface *pdds, LPCSTR szBitmap)
{
HBITMAP hbm;
HRESULT hr;
//当一个资源来加载
hbm = (HBITMAP)LoadImage(GetModuleHandle(NULL), szBitmap, IMAGE_BITMAP, 0, 0,
LR_CREATEDIBSECTION);
//失败，当一个文件加载
if (hbm == NULL)
hbm = (HBITMAP)LoadImage(NULL, szBitmap, IMAGE_BITMAP, 0, 0,
LR_LOADFROMFILE|LR_CREATEDIBSECTION);
//仍然失败
if (hbm == NULL)
{
char str[128];
sprintf(str, "handle is null [%s]\n", szBitmap);
OutputDebugString(str);
return E_FAIL;
}
//把图片显示到页面
hr = DDCopyBitmap(pdds, hbm, 0, 0, 0, 0);
if (hr != DD_OK)
{
OutputDebugString("ddcopybitmap failed\n");
}
DeleteObject(hbm);
return hr;
}
//在一个页面上显示一个bmp图片
extern "C" HRESULT DDCopyBitmap(IDirectDrawSurface *pdds, HBITMAP hbm, int x, int y, int dx, int dy)
{
HDC hdcImage;
HDC hdc;
BITMAP bm;
DDSURFACEDESC ddsd;
HRESULT hr;
if (hbm == NULL || pdds == NULL)
return E_FAIL;
pdds->Restore();
//创建一个和当前屏幕相关的 memory device context
hdcImage = CreateCompatibleDC(NULL);
if (!hdcImage)
OutputDebugString("createcompatible dc failed\n");
SelectObject(hdcImage, hbm);
//得到bmp的大小
GetObject(hbm, sizeof(bm), &bm);
dx = dx == 0 ? bm.bmWidth : dx; // 只要传进来的参数不是0，就使用传进来的参数
dy = dy == 0 ? bm.bmHeight : dy;
//得到页面的大小
ddsd.dwSize = sizeof(ddsd);
ddsd.dwFlags = DDSD_HEIGHT | DDSD_WIDTH;
pdds->GetSurfaceDesc(&ddsd);
if ((hr = pdds->GetDC(&hdc)) == DD_OK)
{
//缩放blt
StretchBlt(hdc, 0, 0, ddsd.dwWidth, ddsd.dwHeight, hdcImage, x, y, dx, dy, SRCCOPY);
pdds->ReleaseDC(hdc);
}
DeleteDC(hdcImage);
return hr;
}
//从一个bmp图片创建一个调色板，要是没有的话就创建一个缺省的调色板
extern "C" IDirectDrawPalette * DDLoadPalette(IDirectDraw *pdd, LPCSTR szBitmap)
{
IDirectDrawPalette* ddpal;
int i;
int n;
int fh;
HRSRC h;
LPBITMAPINFOHEADER lpbi;
PALETTEENTRY ape[256];
RGBQUAD * prgb;
//创建一个缺省的调色板
for (i=0; i<256; i++)
{
//0x07 = 00000111b 0x03 = 00000011b
//3 bit 描述红色, 3 bit 描述绿色, 2 bit 描述蓝色
//为什么呢？简单，让调色板的序号和颜色直接挂上钩
ape[i].peRed = (BYTE)(((i >> 5) & 0x07) * 255 / 7);
ape[i].peGreen = (BYTE)(((i >> 2) & 0x07) * 255 / 7);
ape[i].peBlue = (BYTE)(((i >> 0) & 0x03) * 255 / 3);
ape[i].peFlags = (BYTE)0;
}
//从bmp图片加载
if (szBitmap && (h = FindResource(NULL, szBitmap, RT_BITMAP)))
{
lpbi = (LPBITMAPINFOHEADER)LockResource(LoadResource(NULL, h));
if (!lpbi)
OutputDebugString("lock resource failed\n");
prgb = (RGBQUAD*)((BYTE*)lpbi + lpbi->biSize);
if (lpbi == NULL || lpbi->biSize < sizeof(BITMAPINFOHEADER))
n = 0;
else if (lpbi->biBitCount > 8)
n = 0;
else if (lpbi->biClrUsed == 0)
n = 1 << lpbi->biBitCount;
else
n = lpbi->biClrUsed;
//BGR转化成RGB
for(i=0; i<n; i++ )
{
ape[i].peRed = prgb[i].rgbRed;
ape[i].peGreen = prgb[i].rgbGreen;
ape[i].peBlue = prgb[i].rgbBlue;
ape[i].peFlags = 0;
}
}
else if (szBitmap && (fh = _lopen(szBitmap, OF_READ)) != -1)
{
BITMAPFILEHEADER bf;
BITMAPINFOHEADER bi;
_lread(fh, &bf, sizeof(bf));
_lread(fh, &bi, sizeof(bi));
_lread(fh, ape, sizeof(ape));
_lclose(fh);
if (bi.biSize != sizeof(BITMAPINFOHEADER))
n = 0;
else if (bi.biBitCount > 8)
n = 0;
else if (bi.biClrUsed == 0)
n = 1 << bi.biBitCount;
else
n = bi.biClrUsed;
//同样的方法
for(i=0; i<n; i++ )
{
BYTE r = ape[i].peRed;
ape[i].peRed = ape[i].peBlue;
ape[i].peBlue = r;
}
}
//创建调色板
pdd->CreatePalette(DDPCAPS_8BIT, ape, &ddpal, NULL);
return ddpal;
}
//获得指定颜色所对应的调色板索引
extern "C" DWORD DDColorMatch(IDirectDrawSurface *pdds, COLORREF rgb)
{
COLORREF rgbT;
HDC hdc;
DWORD dw = CLR_INVALID;
DDSURFACEDESC ddsd;
HRESULT hres;
if (rgb != CLR_INVALID && pdds->GetDC(&hdc) == DD_OK)
{
rgbT = GetPixel(hdc, 0, 0); // 保存当前值
SetPixel(hdc, 0, 0, rgb); // 设置成我们的值
pdds->ReleaseDC(hdc);
}
//读回我们的值
ddsd.dwSize = sizeof(ddsd);
while ((hres = pdds->Lock(NULL, &ddsd, 0, NULL)) == DDERR_WASSTILLDRAWING)
;
if (hres == DD_OK)
{
dw = *(DWORD *)ddsd.lpSurface; // 转化成DWORD
dw &= (1 << ddsd.ddpfPixelFormat.dwRGBBitCount)-1; // mask it to bpp
pdds->Unlock(NULL);
}
if (rgb != CLR_INVALID && pdds->GetDC(&hdc) == DD_OK)
{
SetPixel(hdc, 0, 0, rgbT); //恢复原来的值
pdds->ReleaseDC(hdc);
}
return dw;
}
//设置透明色
extern "C" HRESULT DDSetColorKey(IDirectDrawSurface *pdds, COLORREF rgb)
{
DDCOLORKEY ddck;
//颜色转化，要是有调色板的话，转化成索引值
ddck.dwColorSpaceLowValue = DDColorMatch(pdds, rgb);
ddck.dwColorSpaceHighValue = ddck.dwColorSpaceLowValue;
return pdds->SetColorKey(DDCKEY_SRCBLT, &ddck);
}