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@ -4,7 +4,7 @@ |
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#ifndef WIN32_CLIPBOARD_ |
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#define WIN32_CLIPBOARD_ |
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unsigned char* Win32GetClipboardImageData(int* width, int* height, unsigned long long int *dataSize); |
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unsigned char *Win32GetClipboardImageData(int *width, int *height, unsigned long long int *dataSize); |
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#endif // WIN32_CLIPBOARD_ |
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#ifdef WIN32_CLIPBOARD_IMPLEMENTATION |
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@ -92,7 +92,6 @@ unsigned char* Win32GetClipboardImageData(int* width, int* height, unsigned long |
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typedef int WINBOOL; |
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#if !defined(_WINUSER_) || !defined(WINUSER_ALREADY_INCLUDED) |
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WINUSERAPI WINBOOL WINAPI OpenClipboard(HWND hWndNewOwner); |
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WINUSERAPI WINBOOL WINAPI CloseClipboard(VOID); |
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@ -170,8 +169,7 @@ typedef struct tagRGBQUAD { |
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} RGBQUAD, *LPRGBQUAD; |
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#endif |
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// https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-wmf/4e588f70-bd92-4a6f-b77f-35d0feaf7a57 |
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// REF: https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-wmf/4e588f70-bd92-4a6f-b77f-35d0feaf7a57 |
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#define BI_RGB 0x0000 |
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#define BI_RLE8 0x0001 |
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#define BI_RLE4 0x0002 |
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@ -184,10 +182,10 @@ typedef struct tagRGBQUAD { |
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#endif |
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// https://learn.microsoft.com/en-us/windows/win32/dataxchg/standard-clipboard-formats |
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// REF: https://learn.microsoft.com/en-us/windows/win32/dataxchg/standard-clipboard-formats |
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#define CF_DIB 8 |
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// https://learn.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-setsystemcursor |
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// REF: https://learn.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-setsystemcursor |
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// #define OCR_NORMAL 32512 // Normal select |
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// #define OCR_IBEAM 32513 // Text select |
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// #define OCR_WAIT 32514 // Busy |
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@ -202,36 +200,37 @@ typedef struct tagRGBQUAD { |
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// #define OCR_HAND 32649 // Link select |
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// #define OCR_APPSTARTING 32650 // |
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static BOOL OpenClipboardRetrying(HWND handle); // Open clipboard with a number of retries |
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static int GetPixelDataOffset(BITMAPINFOHEADER bih); |
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//---------------------------------------------------------------------------------- |
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// Module Internal Functions Declaration |
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//---------------------------------------------------------------------------------- |
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static BOOL OpenClipboardRetrying(HWND handle); // Open clipboard with a number of retries |
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static int GetPixelDataOffset(BITMAPINFOHEADER bih); |
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unsigned char* Win32GetClipboardImageData(int* width, int* height, unsigned long long int *dataSize) |
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unsigned char *Win32GetClipboardImageData(int *width, int *height, unsigned long long int *dataSize) |
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{ |
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HWND win = NULL; // Get from somewhere but is doesnt seem to matter |
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const char* msgString = ""; |
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const char *msgString = ""; |
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int severity = LOG_INFO; |
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BYTE* bmpData = NULL; |
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if (!OpenClipboardRetrying(win)) { |
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BYTE *bmpData = NULL; |
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if (!OpenClipboardRetrying(win)) |
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{ |
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severity = LOG_ERROR; |
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msgString = "Couldn't open clipboard"; |
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goto end; |
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} |
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HGLOBAL clipHandle = (HGLOBAL)GetClipboardData(CF_DIB); |
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if (!clipHandle) { |
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if (!clipHandle) |
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{ |
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severity = LOG_ERROR; |
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msgString = "Clipboard data is not an Image"; |
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goto close; |
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} |
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BITMAPINFOHEADER *bmpInfoHeader = (BITMAPINFOHEADER *)GlobalLock(clipHandle); |
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if (!bmpInfoHeader) { |
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if (!bmpInfoHeader) |
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{ |
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// Mapping from HGLOBAL to our local *address space* failed |
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severity = LOG_ERROR; |
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msgString = "Clipboard data failed to be locked"; |
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@ -242,7 +241,8 @@ unsigned char* Win32GetClipboardImageData(int* width, int* height, unsigned long |
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*height = bmpInfoHeader->biHeight; |
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SIZE_T clipDataSize = GlobalSize(clipHandle); |
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if (clipDataSize < sizeof(BITMAPINFOHEADER)) { |
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if (clipDataSize < sizeof(BITMAPINFOHEADER)) |
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{ |
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// Format CF_DIB needs space for BITMAPINFOHEADER struct. |
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msgString = "Clipboard has Malformed data"; |
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severity = LOG_ERROR; |
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@ -259,31 +259,29 @@ unsigned char* Win32GetClipboardImageData(int* width, int* height, unsigned long |
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// |
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//--------------------------------------------------------------------------------// |
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BITMAPFILEHEADER bmpFileHeader = {0}; |
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BITMAPFILEHEADER bmpFileHeader = { 0 }; |
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SIZE_T bmpFileSize = sizeof(bmpFileHeader) + clipDataSize; |
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*dataSize = bmpFileSize; |
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bmpFileHeader.bfType = 0x4D42; //https://stackoverflow.com/questions/601430/multibyte-character-constants-and-bitmap-file-header-type-constants#601536 |
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bmpFileHeader.bfType = 0x4D42; // REF: https://stackoverflow.com/questions/601430/multibyte-character-constants-and-bitmap-file-header-type-constants#601536 |
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bmpFileHeader.bfSize = (DWORD)bmpFileSize; // Up to 4GB works fine |
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bmpFileHeader.bfOffBits = sizeof(bmpFileHeader) + pixelOffset; |
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// |
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// Each process has a default heap provided by the system |
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// WARNING: Each process has a default heap provided by the system |
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// Memory objects allocated by GlobalAlloc and LocalAlloc are in private, |
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// committed pages with read/write access that cannot be accessed by other processes. |
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// committed pages with read/write access that cannot be accessed by other processes |
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// |
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// This may be wrong since we might be allocating in a DLL and freeing from another module, the main application |
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// that may cause heap corruption. We could create a FreeImage function |
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// |
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bmpData = (BYTE *)malloc(sizeof(bmpFileHeader) + clipDataSize); |
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bmpData = (BYTE *)RL_MALLOC(sizeof(bmpFileHeader) + clipDataSize); |
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// First we add the header for a bmp file |
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memcpy(bmpData, &bmpFileHeader, sizeof(bmpFileHeader)); |
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memcpy(bmpData, &bmpFileHeader, sizeof(bmpFileHeader)); // Add BMP file header data |
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// Then we add the header for the bmp itself + the pixel data |
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memcpy(bmpData + sizeof(bmpFileHeader), bmpInfoHeader, clipDataSize); |
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memcpy(bmpData + sizeof(bmpFileHeader), bmpInfoHeader, clipDataSize); // Add BMP info header data |
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msgString = "Clipboad image acquired successfully"; |
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unlock: |
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GlobalUnlock(clipHandle); |
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close: |
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@ -291,6 +289,7 @@ close: |
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end: |
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TRACELOG(severity, msgString); |
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return bmpData; |
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} |
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@ -298,65 +297,57 @@ static BOOL OpenClipboardRetrying(HWND hWnd) |
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{ |
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static const int maxTries = 20; |
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static const int sleepTimeMS = 60; |
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for (int _ = 0; _ < maxTries; ++_) |
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for (int i = 0; i < maxTries; i++) |
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{ |
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// Might be being hold by another process |
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// Or yourself forgot to CloseClipboard |
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if (OpenClipboard(hWnd)) { |
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return true; |
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} |
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if (OpenClipboard(hWnd)) return true; |
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Sleep(sleepTimeMS); |
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} |
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return false; |
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} |
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// Based off of researching microsoft docs and reponses from this question https://stackoverflow.com/questions/30552255/how-to-read-a-bitmap-from-the-windows-clipboard#30552856 |
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// https://learn.microsoft.com/en-us/windows/win32/api/wingdi/ns-wingdi-bitmapinfoheader |
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// Get the byte offset where does the pixels data start (from a packed DIB) |
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// REF: https://stackoverflow.com/questions/30552255/how-to-read-a-bitmap-from-the-windows-clipboard#30552856 |
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// REF: https://learn.microsoft.com/en-us/windows/win32/api/wingdi/ns-wingdi-bitmapinfoheader |
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static int GetPixelDataOffset(BITMAPINFOHEADER bih) |
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{ |
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int offset = 0; |
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const unsigned int rgbaSize = sizeof(RGBQUAD); |
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// ">biSize Specifies the number of bytes required by the structure |
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// l">NOTE: biSize specifies the number of bytes required by the structure |
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// We expect to always be 40 because it should be packed |
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if (40 == bih.biSize && 40 == sizeof(BITMAPINFOHEADER)) |
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if (p">(40 == bih.biSize) && p">(40 == sizeof(BITMAPINFOHEADER))) |
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{ |
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// |
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// biBitCount Specifies the number of bits per pixel. |
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// NOTE: biBitCount specifies the number of bits per pixel. |
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// Might exist some bit masks *after* the header and *before* the pixel offset |
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// we're looking, but only if we have more than |
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// 8 bits per pixel, so we need to ajust for that |
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// |
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if (bih.biBitCount > 8) |
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{ |
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// if bih.biCompression is RBG we should NOT offset more |
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if (bih.biCompression == BI_BITFIELDS) |
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{ |
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offset += 3 * rgbaSize; |
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} else if (bih.biCompression == 6 /* BI_ALPHABITFIELDS */) |
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if (bih.biCompression == BI_BITFIELDS) offset += 3*rgbaSize; |
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else if (bih.biCompression == 6) // BI_ALPHABITFIELDS |
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{ |
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// Not widely supported, but valid. |
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offset += 4 * rgbaSize; |
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// Not widely supported, but valid |
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offset += 4*rgbaSize; |
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} |
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} |
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} |
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// |
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// biClrUsed Specifies the number of color indices in the color table that are actually used by the bitmap. |
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// NOTE: biClrUsed specifies the number of color indices in the color table that are actually used by the bitmap |
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// If this value is zero, the bitmap uses the maximum number of colors |
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// corresponding to the value of the biBitCount member for the compression mode specified by biCompression. |
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// corresponding to the value of the biBitCount member for the compression mode specified by biCompression |
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// If biClrUsed is nonzero and the biBitCount member is less than 16 |
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// the biClrUsed member specifies the actual number of colors |
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// |
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if (bih.biClrUsed > 0) { |
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offset += bih.biClrUsed * rgbaSize; |
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} else { |
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if (bih.biBitCount < 16) |
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{ |
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offset = offset + (rgbaSize << bih.biBitCount); |
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} |
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if (bih.biClrUsed > 0) offset += bih.biClrUsed*rgbaSize; |
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else |
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{ |
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if (bih.biBitCount < 16) offset = offset + (rgbaSize << bih.biBitCount); |
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} |
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return bih.biSize + offset; |
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