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// 16 august 2014
#include "winapi_windows.h"
#include "_cgo_export.h"
// TODO eliminate duplicate code
// TODO top left pixel of checkbox state 0 not drawn?
HBITMAP unscaledBitmap(void *i, intptr_t dx, intptr_t dy)
{
BITMAPINFO bi;
VOID *ppvBits;
HBITMAP bitmap;
ZeroMemory(&bi, sizeof (BITMAPINFO));
bi.bmiHeader.biSize = sizeof (BITMAPINFOHEADER);
bi.bmiHeader.biWidth = (LONG) dx;
bi.bmiHeader.biHeight = -((LONG) dy); // negative height to force top-down drawing;
bi.bmiHeader.biPlanes = 1;
bi.bmiHeader.biBitCount = 32;
bi.bmiHeader.biCompression = BI_RGB;
bi.bmiHeader.biSizeImage = (DWORD) (dx * dy * 4);
bitmap = CreateDIBSection(NULL, &bi, DIB_RGB_COLORS, &ppvBits, 0, 0);
if (bitmap == NULL)
xpanic("error creating HBITMAP for unscaled ImageList image copy", GetLastError());
dotoARGB(i, (void *) ppvBits);
return bitmap;
}
HIMAGELIST newImageList(int width, int height)
{
HIMAGELIST il;
// TODO does this strip alpha?
// sinni800 in irc.freenode.net/#go-nuts suggests our use of *image.RGBA makes this not so much of an issue
il = (*fv_ImageList_Create)(width, height, ILC_COLOR32, 20, 20); // should be reasonable
if (il == NULL)
xpanic("error creating image list", GetLastError());
return il;
}
void addImage(HIMAGELIST il, HWND hwnd, HBITMAP bitmap, int origwid, int oright, int width, int height)
{
BOOL wasScaled = FALSE;
HDC winDC, scaledDC, origDC;
HBITMAP scaled;
HBITMAP prevscaled, prevorig;
// first we need to scale the bitmap
if (origwid == width && oright == height) {
scaled = bitmap;
goto noscale;
}
wasScaled = TRUE;
winDC = GetDC(hwnd);
if (winDC == NULL)
xpanic("error getting DC for window", GetLastError());
origDC = CreateCompatibleDC(winDC);
if (origDC == NULL)
xpanic("error getting DC for original ImageList bitmap", GetLastError());
prevorig = SelectObject(origDC, bitmap);
if (prevorig == NULL)
xpanic("error selecting original ImageList bitmap into DC", GetLastError());
scaledDC = CreateCompatibleDC(origDC);
if (scaledDC == NULL)
xpanic("error getting DC for scaled ImageList bitmap", GetLastError());
scaled = CreateCompatibleBitmap(origDC, width, height);
if (scaled == NULL)
xpanic("error creating scaled ImageList bitmap", GetLastError());
prevscaled = SelectObject(scaledDC, scaled);
if (prevscaled == NULL)
xpanic("error selecting scaled ImageList bitmap into DC", GetLastError());
if (SetStretchBltMode(scaledDC, COLORONCOLOR) == 0)
xpanic("error setting scaling mode", GetLastError());
if (StretchBlt(scaledDC, 0, 0, width, height,
origDC, 0, 0, origwid, oright,
SRCCOPY) == 0)
xpanic("error scaling ImageList bitmap down", GetLastError());
if (SelectObject(origDC, prevorig) != bitmap)
xpanic("error selecting previous bitmap into original image's DC", GetLastError());
if (DeleteDC(origDC) == 0)
xpanic("error deleting original image's DC", GetLastError());
if (SelectObject(scaledDC, prevscaled) != scaled)
xpanic("error selecting previous bitmap into scaled image's DC", GetLastError());
if (DeleteDC(scaledDC) == 0)
xpanic("error deleting scaled image's DC", GetLastError());
if (ReleaseDC(hwnd, winDC) == 0)
xpanic("error deleting window DC", GetLastError());
noscale:
if ((*fv_ImageList_Add)(il, scaled, NULL) == -1)
xpanic("error adding ImageList image to image list", GetLastError());
if (wasScaled) // clean up
if (DeleteObject(scaled) == 0)
xpanic("error deleting scaled bitmap", GetLastError());
}
void applyImageList(HWND hwnd, UINT uMsg, WPARAM wParam, HIMAGELIST il)
{
if (SendMessageW(hwnd, uMsg, wParam, (LPARAM) il) == (LRESULT) NULL)
;//TODO xpanic("error setting image list", GetLastError());
// TODO free old one here if any
}
static UINT dfcState(int cbstate)
{
UINT ret;
ret = DFCS_BUTTONCHECK;
if ((cbstate & checkboxStateChecked) != 0)
ret |= DFCS_CHECKED;
if ((cbstate & checkboxStateHot) != 0)
ret |= DFCS_HOT;
if ((cbstate & checkboxStatePushed) != 0)
ret |= DFCS_PUSHED;
return ret;
}
static HBITMAP dfcImage(HDC dc, int width, int height, int cbState)
{
BITMAPINFO bi;
VOID *ppvBits;
HBITMAP bitmap;
RECT r;
HDC drawDC;
HBITMAP prevbitmap;
r.left = 0;
r.top = 0;
r.right = width;
r.bottom = height;
ZeroMemory(&bi, sizeof (BITMAPINFO));
bi.bmiHeader.biSize = sizeof (BITMAPINFOHEADER);
bi.bmiHeader.biWidth = (LONG) width;
bi.bmiHeader.biHeight = -((LONG) height); // negative height to force top-down drawing;
bi.bmiHeader.biPlanes = 1;
bi.bmiHeader.biBitCount = 32;
bi.bmiHeader.biCompression = BI_RGB;
bi.bmiHeader.biSizeImage = (DWORD) (width * height * 4);
bitmap = CreateDIBSection(NULL, &bi, DIB_RGB_COLORS, &ppvBits, 0, 0);
if (bitmap == NULL)
xpanic("error creating HBITMAP for unscaled ImageList image copy", GetLastError());
drawDC = CreateCompatibleDC(dc);
if (drawDC == NULL)
xpanic("error getting DC for checkbox image list bitmap", GetLastError());
prevbitmap = SelectObject(drawDC, bitmap);
if (prevbitmap == NULL)
xpanic("error selecting checkbox image list bitmap into DC", GetLastError());
if (DrawFrameControl(drawDC, &r, DFC_BUTTON, dfcState(cbState)) == 0)
xpanic("error drawing checkbox image", GetLastError());
if (SelectObject(drawDC, prevbitmap) != bitmap)
xpanic("error selecting previous bitmap into checkbox image's DC", GetLastError());
if (DeleteDC(drawDC) == 0)
xpanic("error deleting checkbox image's DC", GetLastError());
return bitmap;
}
HIMAGELIST checkboxImageList = NULL;
void makeCheckboxImageList_DFC(HWND hwnddc)
{
int width, height;
int cbState;
HDC dc;
HIMAGELIST il;
// there's no real metric around
// let's use SM_CX/YSMICON and hope for the best
width = GetSystemMetrics(SM_CXSMICON);
height = GetSystemMetrics(SM_CYSMICON);
dc = GetDC(hwnddc);
if (dc == NULL)
xpanic("error getting DC for making the checkbox image list", GetLastError());
checkboxImageList = (*fv_ImageList_Create)(width, height, ILC_COLOR32, 20, 20); // should be reasonable
if (checkboxImageList == NULL)
xpanic("error creating checkbox image list", GetLastError());
for (cbState = 0; cbState < checkboxnStates; cbState++) {
HBITMAP bitmap;
bitmap = dfcImage(dc, width, height, cbState);
if ((*fv_ImageList_Add)(checkboxImageList, bitmap, NULL) == -1)
xpanic("error adding checkbox image to image list", GetLastError());
if (DeleteObject(bitmap) == 0)
xpanic("error deleting checkbox bitmap", GetLastError());
}
if (ReleaseDC(hwnddc, dc) == 0)
xpanic("error deleting checkbox image list DC", GetLastError());
}
static HTHEME theme = NULL;
static void openTheme(HWND hwnd)
{
if (theme != NULL)
// TODO save HRESULT
if (CloseThemeData(theme) != S_OK)
xpanic("error closing theme", GetLastError());
// ignore error; if it can't be done, we can fall back to DrawFrameControl()
theme = OpenThemeData(hwnd, L"button");
}
static int themestates[checkboxnStates] = {
CBS_UNCHECKEDNORMAL, // 0
CBS_CHECKEDNORMAL, // checked
CBS_UNCHECKEDHOT, // hot
CBS_CHECKEDHOT, // checked | hot
CBS_UNCHECKEDPRESSED, // pushed
CBS_CHECKEDPRESSED, // checked | pushed
CBS_UNCHECKEDPRESSED, // hot | pushed
CBS_CHECKEDPRESSED, // checked | hot | pushed
};
static SIZE getStateSize(HDC dc, int cbState)
{
SIZE s;
// TODO use HRESULT
if (GetThemePartSize(theme, dc, BP_CHECKBOX, themestates[cbState], NULL, TS_DRAW, &s) != S_OK)
xpanic("error getting theme part size", GetLastError());
return s;
}
static HBITMAP drawThemeImage(HDC dc, int width, int height, int cbState)
{
BITMAPINFO bi;
VOID *ppvBits;
HBITMAP bitmap;
RECT r;
HDC drawDC;
HBITMAP prevbitmap;
r.left = 0;
r.top = 0;
r.right = width;
r.bottom = height;
ZeroMemory(&bi, sizeof (BITMAPINFO));
bi.bmiHeader.biSize = sizeof (BITMAPINFOHEADER);
bi.bmiHeader.biWidth = (LONG) width;
bi.bmiHeader.biHeight = -((LONG) height); // negative height to force top-down drawing;
bi.bmiHeader.biPlanes = 1;
bi.bmiHeader.biBitCount = 32;
bi.bmiHeader.biCompression = BI_RGB;
bi.bmiHeader.biSizeImage = (DWORD) (width * height * 4);
bitmap = CreateDIBSection(NULL, &bi, DIB_RGB_COLORS, &ppvBits, 0, 0);
if (bitmap == NULL)
xpanic("error creating HBITMAP for unscaled ImageList image copy", GetLastError());
drawDC = CreateCompatibleDC(dc);
if (drawDC == NULL)
xpanic("error getting DC for checkbox image list bitmap", GetLastError());
prevbitmap = SelectObject(drawDC, bitmap);
if (prevbitmap == NULL)
xpanic("error selecting checkbox image list bitmap into DC", GetLastError());
// TODO get HRESULT
if (DrawThemeBackground(theme, drawDC, BP_CHECKBOX, themestates[cbState], &r, NULL) != S_OK)
xpanic("error drawing checkbox image", GetLastError());
if (SelectObject(drawDC, prevbitmap) != bitmap)
xpanic("error selecting previous bitmap into checkbox image's DC", GetLastError());
if (DeleteDC(drawDC) == 0)
xpanic("error deleting checkbox image's DC", GetLastError());
return bitmap;
}
void makeCheckboxImageList_theme(HWND hwnddc)
{
int width, height;
int cbState;
SIZE size;
HDC dc;
// first, make sure that all things have the same size
dc = GetDC(hwnddc);
if (dc == NULL)
xpanic("error getting DC for making the checkbox image list", GetLastError());
size = getStateSize(dc, 0);
for (cbState = 1; cbState < checkboxnStates; cbState++) {
SIZE against;
against = getStateSize(dc, cbState);
if (size.cx != against.cx || size.cy != against.cy)
xpanic("size mismatch in checkbox states", GetLastError());
}
width = (int) size.cx;
height = (int) size.cy;
// NOW draw
checkboxImageList = (*fv_ImageList_Create)(width, height, ILC_COLOR32, 20, 20); // should be reasonable
if (checkboxImageList == NULL)
xpanic("error creating checkbox image list", GetLastError());
for (cbState = 0; cbState < checkboxnStates; cbState++) {
HBITMAP bitmap;
bitmap = drawThemeImage(dc, width, height, cbState);
if ((*fv_ImageList_Add)(checkboxImageList, bitmap, NULL) == -1)
xpanic("error adding checkbox image to image list", GetLastError());
if (DeleteObject(bitmap) == 0)
xpanic("error deleting checkbox bitmap", GetLastError());
}
if (ReleaseDC(hwnddc, dc) == 0)
xpanic("error deleting checkbox image list DC", GetLastError());
}
void makeCheckboxImageList(HWND hwnddc)
{
if (theme == NULL) // try to open the theme
openTheme(hwnddc);
if (theme != NULL) { // use the theme
makeCheckboxImageList_theme(hwnddc);
return;
}
// couldn't open; fall back
makeCheckboxImageList_DFC(hwnddc);
}
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