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// Copyright 2010-2012 The W32 Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package w32
import (
"errors"
"fmt"
"syscall"
"unsafe"
)
const (
Ok = 0
GenericError = 1
InvalidParameter = 2
OutOfMemory = 3
ObjectBusy = 4
InsufficientBuffer = 5
NotImplemented = 6
Win32Error = 7
WrongState = 8
Aborted = 9
FileNotFound = 10
ValueOverflow = 11
AccessDenied = 12
UnknownImageFormat = 13
FontFamilyNotFound = 14
FontStyleNotFound = 15
NotTrueTypeFont = 16
UnsupportedGdiplusVersion = 17
GdiplusNotInitialized = 18
PropertyNotFound = 19
PropertyNotSupported = 20
ProfileNotFound = 21
)
func GetGpStatus(s int32) string {
switch s {
case Ok:
return "Ok"
case GenericError:
return "GenericError"
case InvalidParameter:
return "InvalidParameter"
case OutOfMemory:
return "OutOfMemory"
case ObjectBusy:
return "ObjectBusy"
case InsufficientBuffer:
return "InsufficientBuffer"
case NotImplemented:
return "NotImplemented"
case Win32Error:
return "Win32Error"
case WrongState:
return "WrongState"
case Aborted:
return "Aborted"
case FileNotFound:
return "FileNotFound"
case ValueOverflow:
return "ValueOverflow"
case AccessDenied:
return "AccessDenied"
case UnknownImageFormat:
return "UnknownImageFormat"
case FontFamilyNotFound:
return "FontFamilyNotFound"
case FontStyleNotFound:
return "FontStyleNotFound"
case NotTrueTypeFont:
return "NotTrueTypeFont"
case UnsupportedGdiplusVersion:
return "UnsupportedGdiplusVersion"
case GdiplusNotInitialized:
return "GdiplusNotInitialized"
case PropertyNotFound:
return "PropertyNotFound"
case PropertyNotSupported:
return "PropertyNotSupported"
case ProfileNotFound:
return "ProfileNotFound"
}
return "Unknown Status Value"
}
var (
token uintptr
modgdiplus = syscall.NewLazyDLL("gdiplus.dll")
procGdipCreateBitmapFromFile = modgdiplus.NewProc("GdipCreateBitmapFromFile")
procGdipCreateBitmapFromHBITMAP = modgdiplus.NewProc("GdipCreateBitmapFromHBITMAP")
procGdipCreateHBITMAPFromBitmap = modgdiplus.NewProc("GdipCreateHBITMAPFromBitmap")
procGdipCreateBitmapFromResource = modgdiplus.NewProc("GdipCreateBitmapFromResource")
procGdipCreateBitmapFromStream = modgdiplus.NewProc("GdipCreateBitmapFromStream")
procGdipDisposeImage = modgdiplus.NewProc("GdipDisposeImage")
procGdiplusShutdown = modgdiplus.NewProc("GdiplusShutdown")
procGdiplusStartup = modgdiplus.NewProc("GdiplusStartup")
)
func GdipCreateBitmapFromFile(filename string) (*uintptr, error) {
var bitmap *uintptr
ret, _, _ := procGdipCreateBitmapFromFile.Call(
uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(filename))),
uintptr(unsafe.Pointer(&bitmap)))
if ret != Ok {
return nil, errors.New(fmt.Sprintf("GdipCreateBitmapFromFile failed with status '%s' for file '%s'", GetGpStatus(int32(ret)), filename))
}
return bitmap, nil
}
func GdipCreateBitmapFromResource(instance HINSTANCE, resId *uint16) (*uintptr, error) {
var bitmap *uintptr
ret, _, _ := procGdipCreateBitmapFromResource.Call(
uintptr(instance),
uintptr(unsafe.Pointer(resId)),
uintptr(unsafe.Pointer(&bitmap)))
if ret != Ok {
return nil, errors.New(fmt.Sprintf("GdiCreateBitmapFromResource failed with status '%s'", GetGpStatus(int32(ret))))
}
return bitmap, nil
}
func GdipCreateBitmapFromStream(stream *IStream) (*uintptr, error) {
var bitmap *uintptr
ret, _, _ := procGdipCreateBitmapFromStream.Call(
uintptr(unsafe.Pointer(stream)),
uintptr(unsafe.Pointer(&bitmap)))
if ret != Ok {
return nil, errors.New(fmt.Sprintf("GdipCreateBitmapFromStream failed with status '%s'", GetGpStatus(int32(ret))))
}
return bitmap, nil
}
func GdipCreateHBITMAPFromBitmap(bitmap *uintptr, background uint32) (HBITMAP, error) {
var hbitmap HBITMAP
ret, _, _ := procGdipCreateHBITMAPFromBitmap.Call(
uintptr(unsafe.Pointer(bitmap)),
uintptr(unsafe.Pointer(&hbitmap)),
uintptr(background))
if ret != Ok {
return 0, errors.New(fmt.Sprintf("GdipCreateHBITMAPFromBitmap failed with status '%s'", GetGpStatus(int32(ret))))
}
return hbitmap, nil
}
func GdipDisposeImage(image *uintptr) {
procGdipDisposeImage.Call(uintptr(unsafe.Pointer(image)))
}
func GdiplusShutdown() {
procGdiplusShutdown.Call(token)
}
func GdiplusStartup(input *GdiplusStartupInput, output *GdiplusStartupOutput) {
ret, _, _ := procGdiplusStartup.Call(
uintptr(unsafe.Pointer(&token)),
uintptr(unsafe.Pointer(input)),
uintptr(unsafe.Pointer(output)))
if ret != Ok {
panic("GdiplusStartup failed with status " + GetGpStatus(int32(ret)))
}
}
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