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Update win32_clipboard.h

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Ray
2026-02-09 23:28:02 +01:00
parent 7e59e1d93d
commit b39cc6bce7
1 changed files with 65 additions and 87 deletions
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152
src/external/win32_clipboard.h vendored
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@ -180,6 +180,10 @@ typedef struct tagRGBQUAD {
#define BI_CMYKRLE8 0x000C #define BI_CMYKRLE8 0x000C
#define BI_CMYKRLE4 0x000D #define BI_CMYKRLE4 0x000D
// Bitmap not compressed and that the color table consists of four DWORD color masks,
// that specify the red, green, blue, and alpha components of each pixel
#define BI_ALPHABITFIELDS 0x0006
#endif #endif
// REF: https://learn.microsoft.com/en-us/windows/win32/dataxchg/standard-clipboard-formats // REF: https://learn.microsoft.com/en-us/windows/win32/dataxchg/standard-clipboard-formats
@ -208,91 +212,70 @@ static int GetPixelDataOffset(BITMAPINFOHEADER bih);
//---------------------------------------------------------------------------------- //----------------------------------------------------------------------------------
unsigned char *Win32GetClipboardImageData(int *width, int *height, unsigned long long int *dataSize) unsigned char *Win32GetClipboardImageData(int *width, int *height, unsigned long long int *dataSize)
{ {
HWND win = NULL; // Get from somewhere but is doesnt seem to matter unsigned char *bmpData = NULL;
const char *msgString = "";
int severity = LOG_INFO;
BYTE *bmpData = NULL;
if (!OpenClipboardRetrying(win)) if (OpenClipboardRetrying(NULL))
{ {
severity = LOG_ERROR; HGLOBAL clipHandle = (HGLOBAL)GetClipboardData(CF_DIB);
msgString = "Couldn't open clipboard"; if (clipHandle != NULL)
goto end; {
BITMAPINFOHEADER *bmpInfoHeader = (BITMAPINFOHEADER *)GlobalLock(clipHandle);
if (bmpInfoHeader)
{
*width = bmpInfoHeader->biWidth;
*height = bmpInfoHeader->biHeight;
SIZE_T clipDataSize = GlobalSize(clipHandle);
if (clipDataSize >= sizeof(BITMAPINFOHEADER))
{
int pixelOffset = GetPixelDataOffset(*bmpInfoHeader);
// Create the bytes for a correct BMP file and copy the data to a pointer
//------------------------------------------------------------------------
BITMAPFILEHEADER bmpFileHeader = { 0 };
SIZE_T bmpFileSize = sizeof(bmpFileHeader) + clipDataSize;
*dataSize = bmpFileSize;
bmpFileHeader.bfType = 0x4D42; // BMP fil type constant
bmpFileHeader.bfSize = (DWORD)bmpFileSize; // Up to 4GB works fine
bmpFileHeader.bfOffBits = sizeof(bmpFileHeader) + pixelOffset;
bmpData = (unsigned char *)RL_MALLOC(sizeof(bmpFileHeader) + clipDataSize);
memcpy(bmpData, &bmpFileHeader, sizeof(bmpFileHeader)); // Add BMP file header data
memcpy(bmpData + sizeof(bmpFileHeader), bmpInfoHeader, clipDataSize); // Add BMP info header data
GlobalUnlock(clipHandle);
CloseClipboard();
TRACELOG(LOG_INFO, "Clipboad image acquired successfully");
//------------------------------------------------------------------------
}
else
{
TRACELOG(LOG_WARNING, "Clipboard data is malformed");
GlobalUnlock(clipHandle);
CloseClipboard();
}
}
else
{
TRACELOG(LOG_WARNING, "Clipboard data failed to be locked");
GlobalUnlock(clipHandle);
CloseClipboard();
}
}
else
{
TRACELOG(LOG_WARNING, "Clipboard data is not an image");
CloseClipboard();
}
} }
else TRACELOG(LOG_WARNING, "Clipboard can not be opened");
HGLOBAL clipHandle = (HGLOBAL)GetClipboardData(CF_DIB);
if (!clipHandle)
{
severity = LOG_ERROR;
msgString = "Clipboard data is not an Image";
goto close;
}
BITMAPINFOHEADER *bmpInfoHeader = (BITMAPINFOHEADER *)GlobalLock(clipHandle);
if (!bmpInfoHeader)
{
// Mapping from HGLOBAL to our local *address space* failed
severity = LOG_ERROR;
msgString = "Clipboard data failed to be locked";
goto unlock;
}
*width = bmpInfoHeader->biWidth;
*height = bmpInfoHeader->biHeight;
SIZE_T clipDataSize = GlobalSize(clipHandle);
if (clipDataSize < sizeof(BITMAPINFOHEADER))
{
// Format CF_DIB needs space for BITMAPINFOHEADER struct.
msgString = "Clipboard has Malformed data";
severity = LOG_ERROR;
goto unlock;
}
// Denotes where the pixel data starts from the bmpInfoHeader pointer
int pixelOffset = GetPixelDataOffset(*bmpInfoHeader);
//--------------------------------------------------------------------------------//
//
// The rest of the section is about create the bytes for a correct BMP file
// Then we copy the data and to a pointer
//
//--------------------------------------------------------------------------------//
BITMAPFILEHEADER bmpFileHeader = { 0 };
SIZE_T bmpFileSize = sizeof(bmpFileHeader) + clipDataSize;
*dataSize = bmpFileSize;
bmpFileHeader.bfType = 0x4D42; // REF: https://stackoverflow.com/questions/601430/multibyte-character-constants-and-bitmap-file-header-type-constants#601536
bmpFileHeader.bfSize = (DWORD)bmpFileSize; // Up to 4GB works fine
bmpFileHeader.bfOffBits = sizeof(bmpFileHeader) + pixelOffset;
// WARNING: Each process has a default heap provided by the system
// Memory objects allocated by GlobalAlloc and LocalAlloc are in private,
// committed pages with read/write access that cannot be accessed by other processes
//
// This may be wrong since we might be allocating in a DLL and freeing from another module, the main application
// that may cause heap corruption. We could create a FreeImage function
bmpData = (BYTE *)RL_MALLOC(sizeof(bmpFileHeader) + clipDataSize);
// First we add the header for a bmp file
memcpy(bmpData, &bmpFileHeader, sizeof(bmpFileHeader)); // Add BMP file header data
// Then we add the header for the bmp itself + the pixel data
memcpy(bmpData + sizeof(bmpFileHeader), bmpInfoHeader, clipDataSize); // Add BMP info header data
msgString = "Clipboad image acquired successfully";
unlock:
GlobalUnlock(clipHandle);
close:
CloseClipboard();
end:
TRACELOG(severity, msgString);
return bmpData; return bmpData;
} }
// Open clipboard with several tries
// NOTE: If parameter is NULL, the open clipboard is associated with the current task
static BOOL OpenClipboardRetrying(HWND hWnd) static BOOL OpenClipboardRetrying(HWND hWnd)
{ {
static const int maxTries = 20; static const int maxTries = 20;
@ -320,22 +303,18 @@ static int GetPixelDataOffset(BITMAPINFOHEADER bih)
// NOTE: biSize specifies the number of bytes required by the structure // NOTE: biSize specifies the number of bytes required by the structure
// We expect to always be 40 because it should be packed // We expect to always be 40 because it should be packed
if ((40 == bih.biSize) && (40 == sizeof(BITMAPINFOHEADER))) if ((bih.biSize == 40) && (sizeof(BITMAPINFOHEADER) == 40))
{ {
// NOTE: biBitCount specifies the number of bits per pixel. // NOTE: biBitCount specifies the number of bits per pixel
// Might exist some bit masks *after* the header and *before* the pixel offset // Might exist some bit masks *after* the header and *before* the pixel offset
// we're looking, but only if we have more than // we're looking, but only if we have more than
// 8 bits per pixel, so we need to ajust for that // 8 bits per pixel, so we need to ajust for that
if (bih.biBitCount > 8) if (bih.biBitCount > 8)
{ {
// if bih.biCompression is RBG we should NOT offset more // If (bih.biCompression == BI_RGB) we should NOT offset more
if (bih.biCompression == BI_BITFIELDS) offset += 3*rgbaSize; if (bih.biCompression == BI_BITFIELDS) offset += 3*rgbaSize;
else if (bih.biCompression == 6) // BI_ALPHABITFIELDS else if (bih.biCompression == BI_ALPHABITFIELDS) offset += 4*rgbaSize; // Not widely supported, but valid
{
// Not widely supported, but valid
offset += 4*rgbaSize;
}
} }
} }
@ -353,4 +332,3 @@ static int GetPixelDataOffset(BITMAPINFOHEADER bih)
return bih.biSize + offset; return bih.biSize + offset;
} }
#endif // WIN32_CLIPBOARD_IMPLEMENTATION #endif // WIN32_CLIPBOARD_IMPLEMENTATION
// EOF