1 files changed, 175 insertions, 0 deletions
diff --git a/packages/w32/gdiplus.go b/packages/w32/gdiplus.go
new file mode 100644
index 0000000..f3a8fca
--- /dev/null
+++ b/packages/w32/gdiplus.go
@@ -0,0 +1,175 @@
+// 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)))
+	}
+}