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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,128 @@ | ||
| #include "pch.h" | ||
| #include "IconWriter.h" | ||
|
|
||
| namespace { | ||
| struct ICONDIRENTRY { | ||
| BYTE nWidth; | ||
| BYTE nHeight; | ||
| BYTE nNumColorsInPalette; // 0 if no palette | ||
| BYTE nReserved; // should be 0 | ||
| WORD nNumColorPlanes; // 0 or 1 | ||
| WORD nBitsPerPixel; | ||
| ULONG nDataLength; // length in bytes | ||
| ULONG nOffset; // offset of BMP or PNG data from beginning of file | ||
| }; | ||
|
|
||
| struct ICONHEADER { | ||
| WORD idReserved; // must be 0 | ||
| WORD idType; // 1 = ICON, 2 = CURSOR | ||
| WORD idCount; // number of images | ||
| }; | ||
| } | ||
|
|
||
| static bool GetIconData(HICON hIcon, int nColorBits, std::vector<std::byte>& buff, bool icon) { | ||
|
|
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| // Write header | ||
| ICONHEADER icoHeader{ 0 }; | ||
| icoHeader.idCount = 1; | ||
| icoHeader.idType = icon ? 1 : 2; | ||
| auto header = reinterpret_cast<std::byte*>(&icoHeader); | ||
| buff.insert(buff.end(), header, header + sizeof(icoHeader)); | ||
|
|
||
| // Get information about icon | ||
| ICONINFO iconInfo; | ||
| ::GetIconInfo(hIcon, &iconInfo); | ||
| BITMAPINFO bmInfo = { 0 }; | ||
| bmInfo.bmiHeader.biSize = sizeof(BITMAPINFOHEADER); | ||
| bmInfo.bmiHeader.biBitCount = 0; // don't get the color table | ||
| HDC dc = CreateCompatibleDC(nullptr); | ||
| if (!::GetDIBits(dc, iconInfo.hbmColor, 0, 0, nullptr, &bmInfo, DIB_RGB_COLORS)) { | ||
| return false; | ||
| } | ||
|
|
||
| // Allocate size of bitmap info header plus space for color table: | ||
| uint32_t nBmInfoSize = sizeof(BITMAPINFOHEADER); | ||
| if (nColorBits < 24) { | ||
| nBmInfoSize += (int)sizeof(RGBQUAD) * (1 << nColorBits); | ||
| } | ||
|
|
||
| std::vector<UCHAR> bitmapInfo; | ||
| bitmapInfo.resize(nBmInfoSize); | ||
| auto pBmInfo = (BITMAPINFO*)bitmapInfo.data(); | ||
| memcpy(pBmInfo, &bmInfo, sizeof(BITMAPINFOHEADER)); | ||
|
|
||
| // Get bitmap data: | ||
| if (!bmInfo.bmiHeader.biSizeImage) | ||
| return false; | ||
| std::vector<UCHAR> bits; | ||
| bits.resize(bmInfo.bmiHeader.biSizeImage); | ||
| pBmInfo->bmiHeader.biBitCount = (WORD)nColorBits; | ||
| pBmInfo->bmiHeader.biCompression = BI_RGB; | ||
| if (!::GetDIBits(dc, iconInfo.hbmColor, 0, bmInfo.bmiHeader.biHeight, bits.data(), pBmInfo, DIB_RGB_COLORS)) { | ||
| return false; | ||
| } | ||
|
|
||
| // Get mask data | ||
| BITMAPINFO maskInfo = { 0 }; | ||
| maskInfo.bmiHeader.biSize = sizeof(BITMAPINFOHEADER); | ||
| maskInfo.bmiHeader.biBitCount = 0; // don't get the color table | ||
| if (!::GetDIBits(dc, iconInfo.hbmMask, 0, 0, nullptr, &maskInfo, DIB_RGB_COLORS) || maskInfo.bmiHeader.biBitCount != 1) | ||
| return false; | ||
|
|
||
| std::vector<UCHAR> maskBits; | ||
| maskBits.resize(maskInfo.bmiHeader.biSizeImage); | ||
| std::vector<UCHAR> maskInfoBytes; | ||
| maskInfoBytes.resize(sizeof(BITMAPINFO) + 2 * sizeof(RGBQUAD)); | ||
| auto pMaskInfo = (BITMAPINFO*)maskInfoBytes.data(); | ||
| memcpy(pMaskInfo, &maskInfo, sizeof(maskInfo)); | ||
| if (!::GetDIBits(dc, iconInfo.hbmMask, 0, maskInfo.bmiHeader.biHeight, maskBits.data(), pMaskInfo, DIB_RGB_COLORS)) { | ||
| return false; | ||
| } | ||
|
|
||
| // Write directory entry: | ||
| ICONDIRENTRY dir; | ||
| dir.nWidth = (UCHAR)pBmInfo->bmiHeader.biWidth; | ||
| dir.nHeight = (UCHAR)pBmInfo->bmiHeader.biHeight; | ||
| dir.nNumColorsInPalette = (nColorBits == 4 ? 16 : 0); | ||
| dir.nReserved = 0; | ||
| dir.nNumColorPlanes = 0; | ||
| dir.nBitsPerPixel = pBmInfo->bmiHeader.biBitCount; | ||
| dir.nDataLength = pBmInfo->bmiHeader.biSizeImage + pMaskInfo->bmiHeader.biSizeImage + nBmInfoSize; | ||
| dir.nOffset = sizeof(dir) + sizeof(icoHeader); | ||
| buff.insert(buff.end(), reinterpret_cast<std::byte*>(&dir), reinterpret_cast<std::byte*>(&dir) + sizeof(dir)); | ||
|
|
||
| // Write DIB header (including color table): | ||
| int nBitsSize = pBmInfo->bmiHeader.biSizeImage; | ||
| pBmInfo->bmiHeader.biHeight *= 2; // because the header is for both image and mask | ||
| pBmInfo->bmiHeader.biCompression = 0; | ||
| pBmInfo->bmiHeader.biSizeImage += pMaskInfo->bmiHeader.biSizeImage; // because the header is for both image and mask | ||
| buff.insert(buff.end(), reinterpret_cast<std::byte*>(&pBmInfo->bmiHeader), reinterpret_cast<std::byte*>(&pBmInfo->bmiHeader) + nBmInfoSize); | ||
|
|
||
| // Write image data | ||
| buff.insert(buff.end(), reinterpret_cast<std::byte*>(bits.data()), reinterpret_cast<std::byte*>(bits.data()) + nBitsSize); | ||
|
|
||
| // Write mask data | ||
| buff.insert(buff.end(), reinterpret_cast<std::byte*>(maskBits.data()), reinterpret_cast<std::byte*>(maskBits.data()) + pMaskInfo->bmiHeader.biSizeImage); | ||
|
|
||
| ::DeleteObject(iconInfo.hbmColor); | ||
| ::DeleteObject(iconInfo.hbmMask); | ||
|
|
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| ::DeleteDC(dc); | ||
|
|
||
| return true; | ||
| } | ||
|
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| bool IconWriter::Save(PCWSTR path, HICON const hIcon, int colors, bool icon) { | ||
| std::vector<std::byte> data; | ||
| if (!GetIconData(hIcon, colors, data, icon)) | ||
| return false; | ||
|
|
||
| auto hFile = ::CreateFile(path, GENERIC_WRITE, 0, nullptr, OPEN_ALWAYS, 0, nullptr); | ||
| if (hFile == INVALID_HANDLE_VALUE) | ||
| return false; | ||
|
|
||
| DWORD bytes; | ||
| auto ok = ::WriteFile(hFile, data.data(), (DWORD)data.size(), &bytes, nullptr); | ||
| ::CloseHandle(hFile); | ||
| return ok; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,7 @@ | ||
| #pragma once | ||
|
|
||
| struct IconWriter final abstract { | ||
| public: | ||
| static bool Save(PCWSTR path, HICON const hIcon, int colors, bool icon = true); | ||
| }; | ||
|
|
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