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e31031f603
This is prerequisite to supporting Vista+ iteration of the msstyles format, and also for implementing GetThemeStream() later. Visual styles compiled for Vista+ can now use PNG images in the IMAGE group. This does not affect the ability to use BMP images, they can be mixed now.
95 lines
2 KiB
C++
95 lines
2 KiB
C++
/*
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* PROJECT: ReactOS uxtheme.dll
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* LICENSE: LGPL-2.1-or-later (https://spdx.org/licenses/LGPL-2.1-or-later)
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* PURPOSE: Support for PNG images in visual styles
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* COPYRIGHT: Copyright 2023 Ethan Rodensky <splitwirez@gmail.com>
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*/
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#include "uxthemep.h"
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#include <ole2.h>
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#include <objidl.h>
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#include <gdiplus.h>
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#include <gdipluscolor.h>
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#include <winreg.h>
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#include <shlwapi.h>
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BOOL
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MSSTYLES_TryLoadPng(
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_In_ HINSTANCE hTheme,
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_In_ LPCWSTR szFile,
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_In_ LPCWSTR type,
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_Out_ HBITMAP *phBitmap)
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{
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BOOL ret = FALSE;
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HRSRC hRes = FindResourceW(hTheme, szFile, type);
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if (!hRes)
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return FALSE;
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HGLOBAL hAlloc = LoadResource(hTheme, hRes);
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if (!hAlloc)
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return FALSE;
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DWORD dwSize = SizeofResource(hTheme, hRes);
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LPVOID pData = LockResource(hAlloc);
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if ((!pData) || (dwSize <= 0))
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{
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FreeResource(hAlloc);
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return FALSE;
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}
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IStream* stream = SHCreateMemStream((BYTE*)pData, dwSize);
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if (stream)
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{
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Gdiplus::Bitmap* gdipBitmap = Gdiplus::Bitmap::FromStream(stream, FALSE);
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stream->Release();
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if (gdipBitmap)
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{
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ret = gdipBitmap->GetHBITMAP(Gdiplus::Color(0, 0, 0, 0), phBitmap) == Gdiplus::Ok;
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delete gdipBitmap;
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}
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}
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UnlockResource(pData);
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FreeResource(hAlloc);
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return ret;
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}
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BOOL
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prepare_png_alpha(
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_In_ HBITMAP png,
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_Out_ BOOL* hasAlpha)
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{
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DIBSECTION dib;
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int n;
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BYTE* p;
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*hasAlpha = FALSE;
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if (!png || GetObjectW( png, sizeof(dib), &dib ) != sizeof(dib))
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return FALSE;
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if (dib.dsBm.bmBitsPixel != 32)
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/* nothing to do */
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return TRUE;
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p = (BYTE*)dib.dsBm.bmBits;
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n = dib.dsBmih.biHeight * dib.dsBmih.biWidth;
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while (n-- > 0)
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{
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int a = p[3] + 1;
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if (a < 256)
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{
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p[0] = MulDiv(p[0], 256, a);
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p[1] = MulDiv(p[1], 256, a);
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p[2] = MulDiv(p[2], 256, a);
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*hasAlpha = TRUE;
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}
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p += 4;
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}
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return TRUE;
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}
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