Ddutil.cpp
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上传日期:2008-10-22
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- //-----------------------------------------------------------------------------
- // File: ddutil.cpp
- //
- // Desc: Routines for loading bitmap and palettes from resources
- //
- //
- // Copyright (c) 1995-1998 Microsoft Corporation. All rights reserved.
- //-----------------------------------------------------------------------------
- #ifndef WIN32_LEAN_AND_MEAN
- #define WIN32_LEAN_AND_MEAN
- #endif
- //-----------------------------------------------------------------------------
- // Include files
- //-----------------------------------------------------------------------------
- #include <windows.h>
- #include <windowsx.h>
- #include <ddraw.h>
- #include "ddutil.h"
- //-----------------------------------------------------------------------------
- // Name: DDLoadBitmap()
- // Desc: Create a DirectDrawSurface from a bitmap resource.
- //-----------------------------------------------------------------------------
- extern "C" IDirectDrawSurface7 *
- DDLoadBitmap(IDirectDraw7 * pdd, LPCSTR szBitmap, int dx, int dy)
- {
- HBITMAP hbm;
- BITMAP bm;
- DDSURFACEDESC2 ddsd;
- IDirectDrawSurface7 *pdds;
- //
- // Try to load the bitmap as a resource, if that fails, try it as a file
- //
- hbm = (HBITMAP) LoadImage(GetModuleHandle(NULL), szBitmap, IMAGE_BITMAP, dx,
- dy, LR_CREATEDIBSECTION);
- if (hbm == NULL)
- hbm = (HBITMAP) LoadImage(NULL, szBitmap, IMAGE_BITMAP, dx, dy,
- LR_LOADFROMFILE | LR_CREATEDIBSECTION);
- if (hbm == NULL)
- return NULL;
- //
- // Get size of the bitmap
- //
- GetObject(hbm, sizeof(bm), &bm);
- //
- // Create a DirectDrawSurface for this bitmap
- //
- 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;
- DDCopyBitmap(pdds, hbm, 0, 0, 0, 0);
- DeleteObject(hbm);
- return pdds;
- }
- //-----------------------------------------------------------------------------
- // Name: DDReLoadBitmap()
- // Desc: Load a bitmap from a file or resource into a directdraw surface.
- // normaly used to re-load a surface after a restore.
- //-----------------------------------------------------------------------------
- HRESULT
- DDReLoadBitmap(IDirectDrawSurface7 * pdds, LPCSTR szBitmap)
- {
- HBITMAP hbm;
- HRESULT hr;
- //
- // Try to load the bitmap as a resource, if that fails, try it as a file
- //
- hbm = (HBITMAP) LoadImage(GetModuleHandle(NULL), szBitmap, IMAGE_BITMAP, 0,
- 0, LR_CREATEDIBSECTION);
- if (hbm == NULL)
- hbm = (HBITMAP) LoadImage(NULL, szBitmap, IMAGE_BITMAP, 0, 0,
- LR_LOADFROMFILE | LR_CREATEDIBSECTION);
- if (hbm == NULL)
- {
- OutputDebugString("handle is nulln");
- return E_FAIL;
- }
- hr = DDCopyBitmap(pdds, hbm, 0, 0, 0, 0);
- if (hr != DD_OK)
- {
- OutputDebugString("ddcopybitmap failedn");
- }
- DeleteObject(hbm);
- return hr;
- }
- //-----------------------------------------------------------------------------
- // Name: DDCopyBitmap()
- // Desc: Draw a bitmap into a DirectDrawSurface
- //-----------------------------------------------------------------------------
- extern "C" HRESULT
- DDCopyBitmap(IDirectDrawSurface7 * pdds, HBITMAP hbm, int x, int y,
- int dx, int dy)
- {
- HDC hdcImage;
- HDC hdc;
- BITMAP bm;
- DDSURFACEDESC2 ddsd;
- HRESULT hr;
- if (hbm == NULL || pdds == NULL)
- return E_FAIL;
- //
- // Make sure this surface is restored.
- //
- pdds->Restore();
- //
- // Select bitmap into a memoryDC so we can use it.
- //
- hdcImage = CreateCompatibleDC(NULL);
- if (!hdcImage)
- OutputDebugString("createcompatible dc failedn");
- SelectObject(hdcImage, hbm);
- //
- // Get size of the bitmap
- //
- GetObject(hbm, sizeof(bm), &bm);
- dx = dx == 0 ? bm.bmWidth : dx; // Use the passed size, unless zero
- dy = dy == 0 ? bm.bmHeight : dy;
- //
- // Get size of surface.
- //
- ddsd.dwSize = sizeof(ddsd);
- ddsd.dwFlags = DDSD_HEIGHT | DDSD_WIDTH;
- pdds->GetSurfaceDesc(&ddsd);
- if ((hr = pdds->GetDC(&hdc)) == DD_OK)
- {
- StretchBlt(hdc, 0, 0, ddsd.dwWidth, ddsd.dwHeight, hdcImage, x, y,
- dx, dy, SRCCOPY);
- pdds->ReleaseDC(hdc);
- }
- DeleteDC(hdcImage);
- return hr;
- }
- //-----------------------------------------------------------------------------
- // Name: DDLoadPalette()
- // Desc: Create a DirectDraw palette object from a bitmap resource
- // if the resource does not exist or NULL is passed create a
- // default 332 palette.
- //-----------------------------------------------------------------------------
- extern "C" IDirectDrawPalette *
- DDLoadPalette(IDirectDraw7 * pdd, LPCSTR szBitmap)
- {
- IDirectDrawPalette *ddpal;
- int i;
- int n;
- int fh;
- HRSRC h;
- LPBITMAPINFOHEADER lpbi;
- PALETTEENTRY ape[256];
- RGBQUAD *prgb;
- //
- // Build a 332 palette as the default.
- //
- for (i = 0; i < 256; i++)
- {
- 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;
- }
- //
- // Get a pointer to the bitmap resource.
- //
- if (szBitmap && (h = FindResource(NULL, szBitmap, RT_BITMAP)))
- {
- lpbi = (LPBITMAPINFOHEADER) LockResource(LoadResource(NULL, h));
- if (!lpbi)
- OutputDebugString("lock resource failedn");
- 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;
- //
- // A DIB color table has its colors stored BGR not RGB
- // so flip them around.
- //
- 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;
- //
- // A DIB color table has its colors stored BGR not RGB
- // so flip them around.
- //
- for (i = 0; i < n; i++)
- {
- BYTE r = ape[i].peRed;
- ape[i].peRed = ape[i].peBlue;
- ape[i].peBlue = r;
- }
- }
- pdd->CreatePalette(DDPCAPS_8BIT, ape, &ddpal, NULL);
- return ddpal;
- }
- //-----------------------------------------------------------------------------
- // Name: DDColorMatch()
- // Desc: Convert a RGB color to a pysical color.
- // We do this by leting GDI SetPixel() do the color matching
- // then we lock the memory and see what it got mapped to.
- //-----------------------------------------------------------------------------
- extern "C" DWORD
- DDColorMatch(IDirectDrawSurface7 * pdds, COLORREF rgb)
- {
- COLORREF rgbT;
- HDC hdc;
- DWORD dw = CLR_INVALID;
- DDSURFACEDESC2 ddsd;
- HRESULT hres;
- //
- // Use GDI SetPixel to color match for us
- //
- if (rgb != CLR_INVALID && pdds->GetDC(&hdc) == DD_OK)
- {
- rgbT = GetPixel(hdc, 0, 0); // Save current pixel value
- SetPixel(hdc, 0, 0, rgb); // Set our value
- pdds->ReleaseDC(hdc);
- }
- //
- // Now lock the surface so we can read back the converted color
- //
- ddsd.dwSize = sizeof(ddsd);
- while ((hres = pdds->Lock(NULL, &ddsd, 0, NULL)) == DDERR_WASSTILLDRAWING)
- ;
- if (hres == DD_OK)
- {
- dw = *(DWORD *) ddsd.lpSurface; // Get DWORD
- if (ddsd.ddpfPixelFormat.dwRGBBitCount < 32)
- dw &= (1 << ddsd.ddpfPixelFormat.dwRGBBitCount) - 1; // Mask it to bpp
- pdds->Unlock(NULL);
- }
- //
- // Now put the color that was there back.
- //
- if (rgb != CLR_INVALID && pdds->GetDC(&hdc) == DD_OK)
- {
- SetPixel(hdc, 0, 0, rgbT);
- pdds->ReleaseDC(hdc);
- }
- return dw;
- }
- //-----------------------------------------------------------------------------
- // Name: DDSetColorKey()
- // Desc: Set a color key for a surface, given a RGB.
- // If you pass CLR_INVALID as the color key, the pixel
- // in the upper-left corner will be used.
- //-----------------------------------------------------------------------------
- extern "C" HRESULT
- DDSetColorKey(IDirectDrawSurface7 * pdds, COLORREF rgb)
- {
- DDCOLORKEY ddck;
- ddck.dwColorSpaceLowValue = DDColorMatch(pdds, rgb);
- ddck.dwColorSpaceHighValue = ddck.dwColorSpaceLowValue;
- return pdds->SetColorKey(DDCKEY_SRCBLT, &ddck);
- }