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/*
 * Nuklear - v1.17 - public domain
 * no warrenty implied; use at your own risk.
 * authored from 2015-2016 by Micha Mettke
 */
/*
 * ==============================================================
 *
 *                              API
 *
 * ===============================================================
 */
#ifndef NK_GDIP_H_
#define NK_GDIP_H_

#define WIN32_LEAN_AND_MEAN
#include <windows.h>

/* font */
typedef struct GdipFont GdipFont;
NK_API GdipFont* nk_gdipfont_create(const char *name, int size);
NK_API void nk_gdipfont_del(GdipFont *font);

NK_API struct nk_context* nk_gdip_init(HWND hwnd, unsigned int width, unsigned int height);
NK_API void nk_gdip_set_font(GdipFont *font);
NK_API int nk_gdip_handle_event(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam);
NK_API void nk_gdip_render(enum nk_anti_aliasing AA, struct nk_color clear);
NK_API void nk_gdip_shutdown(void);

#endif
/*
 * ==============================================================
 *
 *                          IMPLEMENTATION
 *
 * ===============================================================
 */
#ifdef NK_GDIP_IMPLEMENTATION

#include <stdlib.h>
#include <malloc.h>

/* manually declare everything GDI+ needs, because
   GDI+ headers are not usable from C */
#define WINGDIPAPI __stdcall
#define GDIPCONST const

typedef struct GpGraphics GpGraphics;
typedef struct GpImage GpImage;
typedef struct GpPen GpPen;
typedef struct GpBrush GpBrush;
typedef struct GpStringFormat GpStringFormat;
typedef struct GpFont GpFont;
typedef struct GpFontFamily GpFontFamily;
typedef struct GpFontCollection GpFontCollection;

typedef GpImage GpBitmap;
typedef GpBrush GpSolidFill;

typedef int Status;
typedef Status GpStatus;

typedef float REAL;
typedef DWORD ARGB;
typedef POINT GpPoint;

typedef enum {
    TextRenderingHintSystemDefault = 0,
    TextRenderingHintSingleBitPerPixelGridFit = 1,
    TextRenderingHintSingleBitPerPixel = 2,
    TextRenderingHintAntiAliasGridFit = 3,
    TextRenderingHintAntiAlias = 4,
    TextRenderingHintClearTypeGridFit = 5
} TextRenderingHint;

typedef enum {
    StringFormatFlagsDirectionRightToLeft    = 0x00000001,
    StringFormatFlagsDirectionVertical       = 0x00000002,
    StringFormatFlagsNoFitBlackBox           = 0x00000004,
    StringFormatFlagsDisplayFormatControl    = 0x00000020,
    StringFormatFlagsNoFontFallback          = 0x00000400,
    StringFormatFlagsMeasureTrailingSpaces   = 0x00000800,
    StringFormatFlagsNoWrap                  = 0x00001000,
    StringFormatFlagsLineLimit               = 0x00002000,
    StringFormatFlagsNoClip                  = 0x00004000 
} StringFormatFlags;

typedef enum
{
    QualityModeInvalid   = -1,
    QualityModeDefault   = 0,
    QualityModeLow       = 1,
    QualityModeHigh      = 2
} QualityMode;

typedef enum
{
    SmoothingModeInvalid     = QualityModeInvalid,
    SmoothingModeDefault     = QualityModeDefault,
    SmoothingModeHighSpeed   = QualityModeLow,
    SmoothingModeHighQuality = QualityModeHigh,
    SmoothingModeNone,
    SmoothingModeAntiAlias,
    SmoothingModeAntiAlias8x4 = SmoothingModeAntiAlias,
    SmoothingModeAntiAlias8x8
} SmoothingMode;

typedef enum
{
    FontStyleRegular    = 0,
    FontStyleBold       = 1,
    FontStyleItalic     = 2,
    FontStyleBoldItalic = 3,
    FontStyleUnderline  = 4,
    FontStyleStrikeout  = 8
} FontStyle;

typedef enum {
    FillModeAlternate,
    FillModeWinding
} FillMode;

typedef enum {
    CombineModeReplace,
    CombineModeIntersect,
    CombineModeUnion,
    CombineModeXor,
    CombineModeExclude,
    CombineModeComplement
} CombineMode;

typedef enum {
    UnitWorld,
    UnitDisplay,
    UnitPixel,
    UnitPoint,
    UnitInch,
    UnitDocument,
    UnitMillimeter
} Unit;

typedef struct {
    FLOAT X;
    FLOAT Y;
    FLOAT Width;
    FLOAT Height;
} RectF;

typedef enum {
    DebugEventLevelFatal,
    DebugEventLevelWarning
} DebugEventLevel;

typedef VOID (WINAPI *DebugEventProc)(DebugEventLevel level, CHAR *message);

typedef struct {
    UINT32 GdiplusVersion;
    DebugEventProc DebugEventCallback;
    BOOL SuppressBackgroundThread;
    BOOL SuppressExternalCodecs;
} GdiplusStartupInput;

typedef Status (WINAPI *NotificationHookProc)(OUT ULONG_PTR *token);
typedef VOID (WINAPI *NotificationUnhookProc)(ULONG_PTR token);

typedef struct {
    NotificationHookProc NotificationHook;
    NotificationUnhookProc NotificationUnhook;
} GdiplusStartupOutput;

/* startup & shutdown */

Status WINAPI GdiplusStartup(
    OUT ULONG_PTR *token,
    const GdiplusStartupInput *input,
    OUT GdiplusStartupOutput *output);

VOID WINAPI GdiplusShutdown(ULONG_PTR token);

/* image */

GpStatus WINGDIPAPI
GdipCreateBitmapFromGraphics(INT width,
                             INT height,
                             GpGraphics* target,
                             GpBitmap** bitmap);

GpStatus WINGDIPAPI
GdipDisposeImage(GpImage *image);

GpStatus WINGDIPAPI
GdipGetImageGraphicsContext(GpImage *image, GpGraphics **graphics);

/* pen */

GpStatus WINGDIPAPI
GdipCreatePen1(ARGB color, REAL width, Unit unit, GpPen **pen);

GpStatus WINGDIPAPI
GdipDeletePen(GpPen *pen);

GpStatus WINGDIPAPI
GdipSetPenWidth(GpPen *pen, REAL width);

GpStatus WINGDIPAPI
GdipSetPenColor(GpPen *pen, ARGB argb);

/* brush */

GpStatus WINGDIPAPI
GdipCreateSolidFill(ARGB color, GpSolidFill **brush);

GpStatus WINGDIPAPI
GdipDeleteBrush(GpBrush *brush);

GpStatus WINGDIPAPI
GdipSetSolidFillColor(GpSolidFill *brush, ARGB color);

/* font */

GpStatus WINGDIPAPI
GdipCreateFont(
    GDIPCONST GpFontFamily  *fontFamily,
    REAL                 emSize,
    INT                  style,
    Unit                 unit,
    GpFont             **font
);

GpStatus WINGDIPAPI
GdipDeleteFont(GpFont* font);

GpStatus WINGDIPAPI
GdipGetFontSize(GpFont *font, REAL *size);

GpStatus WINGDIPAPI
GdipCreateFontFamilyFromName(GDIPCONST WCHAR *name,
                             GpFontCollection *fontCollection,
                             GpFontFamily **fontFamily);

GpStatus WINGDIPAPI
GdipDeleteFontFamily(GpFontFamily *fontFamily);

GpStatus WINGDIPAPI
GdipStringFormatGetGenericTypographic(GpStringFormat **format);

GpStatus WINGDIPAPI
GdipSetStringFormatFlags(GpStringFormat *format, INT flags);

GpStatus WINGDIPAPI
GdipDeleteStringFormat(GpStringFormat *format);

/* graphics */


GpStatus WINGDIPAPI
GdipCreateFromHWND(HWND hwnd, GpGraphics **graphics);

GpStatus WINGDIPAPI
GdipCreateFromHDC(HDC hdc, GpGraphics **graphics);

GpStatus WINGDIPAPI
GdipDeleteGraphics(GpGraphics *graphics);

GpStatus WINGDIPAPI
GdipSetSmoothingMode(GpGraphics *graphics, SmoothingMode smoothingMode);

GpStatus WINGDIPAPI
GdipSetClipRectI(GpGraphics *graphics, INT x, INT y,
    INT width, INT height, CombineMode combineMode);

GpStatus WINGDIPAPI
GdipDrawLineI(GpGraphics *graphics, GpPen *pen, INT x1, INT y1,
                      INT x2, INT y2);

GpStatus WINGDIPAPI
GdipDrawArcI(GpGraphics *graphics, GpPen *pen, INT x, INT y,
    INT width, INT height, REAL startAngle, REAL sweepAngle);

GpStatus WINGDIPAPI
GdipFillPieI(GpGraphics *graphics, GpBrush *brush, INT x, INT y,
    INT width, INT height, REAL startAngle, REAL sweepAngle);

GpStatus WINGDIPAPI
GdipDrawRectangleI(GpGraphics *graphics, GpPen *pen, INT x, INT y,
                      INT width, INT height);

GpStatus WINGDIPAPI
GdipFillRectangleI(GpGraphics *graphics, GpBrush *brush, INT x, INT y,
                   INT width, INT height);

GpStatus WINGDIPAPI
GdipFillPolygonI(GpGraphics *graphics, GpBrush *brush,
                 GDIPCONST GpPoint *points, INT count, FillMode fillMode);

GpStatus WINGDIPAPI
GdipDrawPolygonI(GpGraphics *graphics, GpPen *pen, GDIPCONST GpPoint *points,
                         INT count);

GpStatus WINGDIPAPI
GdipFillEllipseI(GpGraphics *graphics, GpBrush *brush, INT x, INT y,
                 INT width, INT height);

GpStatus WINGDIPAPI
GdipDrawEllipseI(GpGraphics *graphics, GpPen *pen, INT x, INT y,
                         INT width, INT height);

GpStatus WINGDIPAPI
GdipDrawBezierI(GpGraphics *graphics, GpPen *pen, INT x1, INT y1,
                        INT x2, INT y2, INT x3, INT y3, INT x4, INT y4);

GpStatus WINGDIPAPI
GdipDrawString(
    GpGraphics               *graphics,
    GDIPCONST WCHAR          *string,
    INT                       length,
    GDIPCONST GpFont         *font,
    GDIPCONST RectF          *layoutRect,
    GDIPCONST GpStringFormat *stringFormat,
    GDIPCONST GpBrush        *brush
);

GpStatus WINGDIPAPI
GdipGraphicsClear(GpGraphics *graphics, ARGB color);

GpStatus WINGDIPAPI
GdipDrawImageI(GpGraphics *graphics, GpImage *image, INT x, INT y);

GpStatus WINGDIPAPI
GdipMeasureString(
    GpGraphics               *graphics,
    GDIPCONST WCHAR          *string,
    INT                       length,
    GDIPCONST GpFont         *font,
    GDIPCONST RectF          *layoutRect,
    GDIPCONST GpStringFormat *stringFormat,
    RectF                    *boundingBox,
    INT                      *codepointsFitted,
    INT                      *linesFilled
);

GpStatus WINGDIPAPI
GdipSetTextRenderingHint(GpGraphics *graphics, TextRenderingHint mode);

struct GdipFont
{
    struct nk_user_font nk;
    GpFont* handle;
};

static struct {
    ULONG_PTR token;

    GpGraphics *window;
    GpGraphics *memory;
    GpImage *bitmap;
    GpPen *pen;
    GpSolidFill *brush;
    GpStringFormat *format;

    struct nk_context ctx;
} gdip;

static ARGB convert_color(struct nk_color c)
{
    return (c.a << 24) | (c.r << 16) | (c.g << 8) | c.b;
}

static void
nk_gdip_scissor(float x, float y, float w, float h)
{
    GdipSetClipRectI(gdip.memory, (INT)x, (INT)y, (INT)(w + 1), (INT)(h + 1), CombineModeReplace);
}

static void
nk_gdip_stroke_line(short x0, short y0, short x1,
    short y1, unsigned int line_thickness, struct nk_color col)
{
    GdipSetPenWidth(gdip.pen, (REAL)line_thickness);
    GdipSetPenColor(gdip.pen, convert_color(col));
    GdipDrawLineI(gdip.memory, gdip.pen, x0, y0, x1, y1);
}

static void
nk_gdip_stroke_rect(short x, short y, unsigned short w,
    unsigned short h, unsigned short r, unsigned short line_thickness, struct nk_color col)
{
    GdipSetPenWidth(gdip.pen, (REAL)line_thickness);
    GdipSetPenColor(gdip.pen, convert_color(col));
    if (r == 0) {
        GdipDrawRectangleI(gdip.memory, gdip.pen, x, y, w, h);
    } else {
        INT d = 2 * r;
        GdipDrawArcI(gdip.memory, gdip.pen, x, y, d, d, 180, 90);
        GdipDrawLineI(gdip.memory, gdip.pen, x + d, y, x + w - d, y);
        GdipDrawArcI(gdip.memory, gdip.pen, x + w - d, y, d, d, 270, 90);
        GdipDrawLineI(gdip.memory, gdip.pen, x + w, y + d, x + w, y + h - d);
        GdipDrawArcI(gdip.memory, gdip.pen, x + w - d, y + h - d, d, d, 0, 90);
        GdipDrawLineI(gdip.memory, gdip.pen, x, y + d, x + w, y + h - d);
        GdipDrawArcI(gdip.memory, gdip.pen, x, y + h - d, d, d, 90, 90);
        GdipDrawLineI(gdip.memory, gdip.pen, x + d, y + h, x + w - d, y + h);
    }
}

static void
nk_gdip_fill_rect(short x, short y, unsigned short w,
    unsigned short h, unsigned short r, struct nk_color col)
{
    GdipSetSolidFillColor(gdip.brush, convert_color(col));
    if (r == 0) {
        GdipFillRectangleI(gdip.memory, gdip.brush, x, y, w, h);
    } else {
        INT d = 2 * r;
        GdipFillRectangleI(gdip.memory, gdip.brush, x + r, y, w - d, h);
        GdipFillRectangleI(gdip.memory, gdip.brush, x, y + r, w, h - d);
        GdipFillPieI(gdip.memory, gdip.brush, x, y, d, d, 180, 90);
        GdipFillPieI(gdip.memory, gdip.brush, x + w - d, y, d, d, 270, 90);
        GdipFillPieI(gdip.memory, gdip.brush, x + w - d, y + h - d, d, d, 0, 90);
        GdipFillPieI(gdip.memory, gdip.brush, x, y + h - d, d, d, 90, 90);
    }
}

static void
nk_gdip_fill_triangle(short x0, short y0, short x1,
    short y1, short x2, short y2, struct nk_color col)
{
    POINT points[] = {
        { x0, y0 },
        { x1, y1 },
        { x2, y2 },
    };

    GdipSetSolidFillColor(gdip.brush, convert_color(col));
    GdipFillPolygonI(gdip.memory, gdip.brush, points, 3, FillModeAlternate);
}

static void
nk_gdip_stroke_triangle(short x0, short y0, short x1,
    short y1, short x2, short y2, unsigned short line_thickness, struct nk_color col)
{
    POINT points[] = {
        { x0, y0 },
        { x1, y1 },
        { x2, y2 },
        { x0, y0 },
    };
    GdipSetPenWidth(gdip.pen, (REAL)line_thickness);
    GdipSetPenColor(gdip.pen, convert_color(col));
    GdipDrawPolygonI(gdip.memory, gdip.pen, points, 4);
}

static void
nk_gdip_fill_polygon(const struct nk_vec2i *pnts, int count, struct nk_color col)
{
    int i = 0;
    #define MAX_POINTS 64
    POINT points[MAX_POINTS];
    GdipSetSolidFillColor(gdip.brush, convert_color(col));
    for (i = 0; i < count && i < MAX_POINTS; ++i) {
        points[i].x = pnts[i].x;
        points[i].y = pnts[i].y;
    }
    GdipFillPolygonI(gdip.memory, gdip.brush, points, i, FillModeAlternate);
    #undef MAX_POINTS
}

static void
nk_gdip_stroke_polygon(const struct nk_vec2i *pnts, int count,
    unsigned short line_thickness, struct nk_color col)
{
    GdipSetPenWidth(gdip.pen, (REAL)line_thickness);
    GdipSetPenColor(gdip.pen, convert_color(col));
    if (count > 0) {
        int i;
        for (i = 1; i < count; ++i)
            GdipDrawLineI(gdip.memory, gdip.pen, pnts[i-1].x, pnts[i-1].y, pnts[i].x, pnts[i].y);
        GdipDrawLineI(gdip.memory, gdip.pen, pnts[count-1].x, pnts[count-1].y, pnts[0].x, pnts[0].y);
    }
}

static void
nk_gdip_stroke_polyline(const struct nk_vec2i *pnts,
    int count, unsigned short line_thickness, struct nk_color col)
{
    GdipSetPenWidth(gdip.pen, (REAL)line_thickness);
    GdipSetPenColor(gdip.pen, convert_color(col));
    if (count > 0) {
        int i;
        for (i = 1; i < count; ++i)
            GdipDrawLineI(gdip.memory, gdip.pen, pnts[i-1].x, pnts[i-1].y, pnts[i].x, pnts[i].y);
    }
}

static void
nk_gdip_fill_circle(short x, short y, unsigned short w,
    unsigned short h, struct nk_color col)
{
    GdipSetSolidFillColor(gdip.brush, convert_color(col));
    GdipFillEllipseI(gdip.memory, gdip.brush, x, y, w, h);
}

static void
nk_gdip_stroke_circle(short x, short y, unsigned short w,
    unsigned short h, unsigned short line_thickness, struct nk_color col)
{
    GdipSetPenWidth(gdip.pen, (REAL)line_thickness);
    GdipSetPenColor(gdip.pen, convert_color(col));
    GdipDrawEllipseI(gdip.memory, gdip.pen, x, y, w, h);
}

static void
nk_gdip_stroke_curve(struct nk_vec2i p1,
    struct nk_vec2i p2, struct nk_vec2i p3, struct nk_vec2i p4,
    unsigned short line_thickness, struct nk_color col)
{
    GdipSetPenWidth(gdip.pen, (REAL)line_thickness);
    GdipSetPenColor(gdip.pen, convert_color(col));
    GdipDrawBezierI(gdip.memory, gdip.pen, p1.x, p1.y, p2.x, p2.y, p3.x, p3.y, p4.x, p4.y);
}

static void
nk_gdip_draw_text(short x, short y, unsigned short w, unsigned short h,
    const char *text, int len, GdipFont *font, struct nk_color cbg, struct nk_color cfg)
{
    int wsize;
    WCHAR* wstr;
    RectF layout = { (FLOAT)x, (FLOAT)y, (FLOAT)w, (FLOAT)h };

    if(!text || !font || !len) return;

    wsize = MultiByteToWideChar(CP_UTF8, 0, text, len, NULL, 0);
    wstr = (WCHAR*)_alloca(wsize * sizeof(wchar_t));
    MultiByteToWideChar(CP_UTF8, 0, text, len, wstr, wsize);

    GdipSetSolidFillColor(gdip.brush, convert_color(cbg));
    GdipFillRectangleI(gdip.memory, gdip.brush, x, y, w, h);
    GdipSetSolidFillColor(gdip.brush, convert_color(cfg));
    GdipDrawString(gdip.memory, wstr, wsize, font->handle, &layout, gdip.format, gdip.brush);
}

static void
nk_gdip_clear(struct nk_color col)
{
    GdipGraphicsClear(gdip.memory, convert_color(col));
}

static void
nk_gdip_blit(GpGraphics *graphics)
{
    GdipDrawImageI(graphics, gdip.bitmap, 0, 0);
}

GdipFont*
nk_gdipfont_create(const char *name, int size)
{
    GdipFont *font = (GdipFont*)calloc(1, sizeof(GdipFont));
    GpFontFamily *family;

    int wsize = MultiByteToWideChar(CP_UTF8, 0, name, -1, NULL, 0);
    WCHAR* wname = (WCHAR*)_alloca((wsize + 1) * sizeof(wchar_t));
    MultiByteToWideChar(CP_UTF8, 0, name, -1, wname, wsize);
    wname[wsize] = 0;

    GdipCreateFontFamilyFromName(wname, NULL, &family);
    GdipCreateFont(family, (REAL)size, FontStyleRegular, UnitPixel, &font->handle);
    GdipDeleteFontFamily(family);

    return font;
}

static float
nk_gdipfont_get_text_width(nk_handle handle, float height, const char *text, int len)
{
    GdipFont *font = (GdipFont *)handle.ptr;
    RectF layout = { 0.0f, 0.0f, 65536.0f, 65536.0f };
    RectF bbox;
    int wsize;
    WCHAR* wstr;
    if (!font || !text)
        return 0;

    (void)height;
    wsize = MultiByteToWideChar(CP_UTF8, 0, text, len, NULL, 0);
    wstr = (WCHAR*)_alloca(wsize * sizeof(wchar_t));
    MultiByteToWideChar(CP_UTF8, 0, text, len, wstr, wsize);

    GdipMeasureString(gdip.memory, wstr, wsize, font->handle, &layout, gdip.format, &bbox, NULL, NULL);
    return bbox.Width;
}

void
nk_gdipfont_del(GdipFont *font)
{
    if(!font) return;
    GdipDeleteFont(font->handle);
    free(font);
}

static void
nk_gdip_clipbard_paste(nk_handle usr, struct nk_text_edit *edit)
{
    HGLOBAL mem;
    SIZE_T size;
    LPCWSTR wstr;
    int utf8size;
    char* utf8;
    (void)usr;

    if (!IsClipboardFormatAvailable(CF_UNICODETEXT) && OpenClipboard(NULL))
        return;

    mem = (HGLOBAL)GetClipboardData(CF_UNICODETEXT);
    if (!mem) {
        CloseClipboard();
        return;
    }

    size = GlobalSize(mem) - 1;
    if (!size) {
        CloseClipboard();
        return;
    }

    wstr = (LPCWSTR)GlobalLock(mem);
    if (!wstr) {
        CloseClipboard();
        return;
    }

    utf8size = WideCharToMultiByte(CP_UTF8, 0, wstr, (int)(size / sizeof(wchar_t)), NULL, 0, NULL, NULL);
    if (!utf8size) {
        GlobalUnlock(mem);
        CloseClipboard();
        return;
    }

    utf8 = (char*)malloc(utf8size);
    if (!utf8) {
        GlobalUnlock(mem);
        CloseClipboard();
        return;
    }

    WideCharToMultiByte(CP_UTF8, 0, wstr, (int)(size / sizeof(wchar_t)), utf8, utf8size, NULL, NULL);
    nk_textedit_paste(edit, utf8, utf8size);
    free(utf8);
    GlobalUnlock(mem);
    CloseClipboard();
}

static void
nk_gdip_clipbard_copy(nk_handle usr, const char *text, int len)
{
    HGLOBAL mem;
    wchar_t* wstr;
    int wsize;
    (void)usr;

    if (!OpenClipboard(NULL))
        return;

    wsize = MultiByteToWideChar(CP_UTF8, 0, text, len, NULL, 0);
    if (!wsize) {
        CloseClipboard();
        return;
    }

    mem = (HGLOBAL)GlobalAlloc(GMEM_MOVEABLE, (wsize + 1) * sizeof(wchar_t));
    if (!mem) {
        CloseClipboard();
        return;
    }

    wstr = (wchar_t*)GlobalLock(mem);
    if (!wstr) {
        GlobalFree(mem);
        CloseClipboard();
        return;
    }

    MultiByteToWideChar(CP_UTF8, 0, text, len, wstr, wsize);
    wstr[wsize] = 0;
    GlobalUnlock(mem);
    if (!SetClipboardData(CF_UNICODETEXT, mem))
        GlobalFree(mem);
    CloseClipboard();
}

NK_API struct nk_context*
nk_gdip_init(HWND hwnd, unsigned int width, unsigned int height)
{
    GdiplusStartupInput startup = { 1, NULL, FALSE, TRUE };
    GdiplusStartup(&gdip.token, &startup, NULL);

    GdipCreateFromHWND(hwnd, &gdip.window);
    GdipCreateBitmapFromGraphics(width, height, gdip.window, &gdip.bitmap);
    GdipGetImageGraphicsContext(gdip.bitmap, &gdip.memory);
    GdipCreatePen1(0, 1.0f, UnitPixel, &gdip.pen);
    GdipCreateSolidFill(0, &gdip.brush);
    GdipStringFormatGetGenericTypographic(&gdip.format);
    GdipSetStringFormatFlags(gdip.format, StringFormatFlagsNoFitBlackBox | 
        StringFormatFlagsMeasureTrailingSpaces | StringFormatFlagsNoWrap |
        StringFormatFlagsNoClip);

    nk_init_default(&gdip.ctx, NULL);
    gdip.ctx.clip.copy = nk_gdip_clipbard_copy;
    gdip.ctx.clip.paste = nk_gdip_clipbard_paste;
    return &gdip.ctx;
}

NK_API void
nk_gdip_set_font(GdipFont *gdipfont)
{
    struct nk_user_font *font = &gdipfont->nk;
    font->userdata = nk_handle_ptr(gdipfont);
    GdipGetFontSize(gdipfont->handle, &font->height);
    font->width = nk_gdipfont_get_text_width;
    nk_style_set_font(&gdip.ctx, font);
}

NK_API int
nk_gdip_handle_event(HWND wnd, UINT msg, WPARAM wparam, LPARAM lparam)
{
    switch (msg)
    {
    case WM_SIZE:
        if (gdip.window)
        {
            unsigned int width = LOWORD(lparam);
            unsigned int height = HIWORD(lparam);
            GdipDeleteGraphics(gdip.window);
            GdipDeleteGraphics(gdip.memory);
            GdipDisposeImage(gdip.bitmap);
            GdipCreateFromHWND(wnd, &gdip.window);
            GdipCreateBitmapFromGraphics(width, height, gdip.window, &gdip.bitmap);
            GdipGetImageGraphicsContext(gdip.bitmap, &gdip.memory);
        }
        break;

    case WM_PAINT:
    {
        PAINTSTRUCT paint;
        HDC dc = BeginPaint(wnd, &paint);
        GpGraphics *graphics;
        GdipCreateFromHDC(dc, &graphics);
        nk_gdip_blit(graphics);
        GdipDeleteGraphics(graphics);
        EndPaint(wnd, &paint);
        return 1;
    }

    case WM_KEYDOWN:
    case WM_KEYUP:
    case WM_SYSKEYDOWN:
    case WM_SYSKEYUP:
    {
        int down = !((lparam >> 31) & 1);
        int ctrl = GetKeyState(VK_CONTROL) & (1 << 15);

        switch (wparam)
        {
        case VK_SHIFT:
        case VK_LSHIFT:
        case VK_RSHIFT:
            nk_input_key(&gdip.ctx, NK_KEY_SHIFT, down);
            return 1;

        case VK_DELETE:
            nk_input_key(&gdip.ctx, NK_KEY_DEL, down);
            return 1;

        case VK_RETURN:
            nk_input_key(&gdip.ctx, NK_KEY_ENTER, down);
            return 1;

        case VK_TAB:
            nk_input_key(&gdip.ctx, NK_KEY_TAB, down);
            return 1;

        case VK_LEFT:
            if (ctrl)
                nk_input_key(&gdip.ctx, NK_KEY_TEXT_WORD_LEFT, down);
            else
                nk_input_key(&gdip.ctx, NK_KEY_LEFT, down);
            return 1;

        case VK_RIGHT:
            if (ctrl)
                nk_input_key(&gdip.ctx, NK_KEY_TEXT_WORD_RIGHT, down);
            else
                nk_input_key(&gdip.ctx, NK_KEY_RIGHT, down);
            return 1;

        case VK_BACK:
            nk_input_key(&gdip.ctx, NK_KEY_BACKSPACE, down);
            return 1;

        case VK_HOME:
            nk_input_key(&gdip.ctx, NK_KEY_TEXT_START, down);
            nk_input_key(&gdip.ctx, NK_KEY_SCROLL_START, down);
            return 1;

        case VK_END:
            nk_input_key(&gdip.ctx, NK_KEY_TEXT_END, down);
            nk_input_key(&gdip.ctx, NK_KEY_SCROLL_END, down);
            return 1;

        case VK_NEXT:
            nk_input_key(&gdip.ctx, NK_KEY_SCROLL_DOWN, down);
            return 1;

        case VK_PRIOR:
            nk_input_key(&gdip.ctx, NK_KEY_SCROLL_UP, down);
            return 1;

        case 'C':
            if (ctrl) {
                nk_input_key(&gdip.ctx, NK_KEY_COPY, down);
                return 1;
            }
            break;

        case 'V':
            if (ctrl) {
                nk_input_key(&gdip.ctx, NK_KEY_PASTE, down);
                return 1;
            }
            break;

        case 'X':
            if (ctrl) {
                nk_input_key(&gdip.ctx, NK_KEY_CUT, down);
                return 1;
            }
            break;

        case 'Z':
            if (ctrl) {
                nk_input_key(&gdip.ctx, NK_KEY_TEXT_UNDO, down);
                return 1;
            }
            break;

        case 'R':
            if (ctrl) {
                nk_input_key(&gdip.ctx, NK_KEY_TEXT_REDO, down);
                return 1;
            }
            break;
        }
        return 0;
    }

    case WM_CHAR:
        if (wparam >= 32)
        {
            nk_input_unicode(&gdip.ctx, (nk_rune)wparam);
            return 1;
        }
        break;

    case WM_LBUTTONDOWN:
        nk_input_button(&gdip.ctx, NK_BUTTON_LEFT, (short)LOWORD(lparam), (short)HIWORD(lparam), 1);
        SetCapture(wnd);
        return 1;

    case WM_LBUTTONUP:
        nk_input_button(&gdip.ctx, NK_BUTTON_LEFT, (short)LOWORD(lparam), (short)HIWORD(lparam), 0);
        ReleaseCapture();
        return 1;

    case WM_RBUTTONDOWN:
        nk_input_button(&gdip.ctx, NK_BUTTON_RIGHT, (short)LOWORD(lparam), (short)HIWORD(lparam), 1);
        SetCapture(wnd);
        return 1;

    case WM_RBUTTONUP:
        nk_input_button(&gdip.ctx, NK_BUTTON_RIGHT, (short)LOWORD(lparam), (short)HIWORD(lparam), 0);
        ReleaseCapture();
        return 1;

    case WM_MBUTTONDOWN:
        nk_input_button(&gdip.ctx, NK_BUTTON_MIDDLE, (short)LOWORD(lparam), (short)HIWORD(lparam), 1);
        SetCapture(wnd);
        return 1;

    case WM_MBUTTONUP:
        nk_input_button(&gdip.ctx, NK_BUTTON_MIDDLE, (short)LOWORD(lparam), (short)HIWORD(lparam), 0);
        ReleaseCapture();
        return 1;

    case WM_MOUSEWHEEL:
        nk_input_scroll(&gdip.ctx, (float)(short)HIWORD(wparam) / WHEEL_DELTA);
        return 1;

    case WM_MOUSEMOVE:
        nk_input_motion(&gdip.ctx, (short)LOWORD(lparam), (short)HIWORD(lparam));
        return 1;
    }

    return 0;
}

NK_API void
nk_gdip_shutdown(void)
{
    GdipDeleteGraphics(gdip.window);
    GdipDeleteGraphics(gdip.memory);
    GdipDisposeImage(gdip.bitmap);
    GdipDeletePen(gdip.pen);
    GdipDeleteBrush(gdip.brush);
    GdipDeleteStringFormat(gdip.format);
    GdiplusShutdown(gdip.token);

    nk_free(&gdip.ctx);
}

NK_API void
nk_gdip_render(enum nk_anti_aliasing AA, struct nk_color clear)
{
    const struct nk_command *cmd;

    GdipSetTextRenderingHint(gdip.memory, AA != NK_ANTI_ALIASING_OFF ?
        TextRenderingHintClearTypeGridFit : TextRenderingHintSingleBitPerPixelGridFit);
    GdipSetSmoothingMode(gdip.memory, AA != NK_ANTI_ALIASING_OFF ?
        SmoothingModeHighQuality : SmoothingModeNone);
    nk_gdip_clear(clear);

    nk_foreach(cmd, &gdip.ctx)
    {
        switch (cmd->type) {
        case NK_COMMAND_NOP: break;
        case NK_COMMAND_SCISSOR: {
            const struct nk_command_scissor *s =(const struct nk_command_scissor*)cmd;
            nk_gdip_scissor(s->x, s->y, s->w, s->h);
        } break;
        case NK_COMMAND_LINE: {
            const struct nk_command_line *l = (const struct nk_command_line *)cmd;
            nk_gdip_stroke_line(l->begin.x, l->begin.y, l->end.x,
                l->end.y, l->line_thickness, l->color);
        } break;
        case NK_COMMAND_RECT: {
            const struct nk_command_rect *r = (const struct nk_command_rect *)cmd;
            nk_gdip_stroke_rect(r->x, r->y, r->w, r->h,
                (unsigned short)r->rounding, r->line_thickness, r->color);
        } break;
        case NK_COMMAND_RECT_FILLED: {
            const struct nk_command_rect_filled *r = (const struct nk_command_rect_filled *)cmd;
            nk_gdip_fill_rect(r->x, r->y, r->w, r->h,
                (unsigned short)r->rounding, r->color);
        } break;
        case NK_COMMAND_CIRCLE: {
            const struct nk_command_circle *c = (const struct nk_command_circle *)cmd;
            nk_gdip_stroke_circle(c->x, c->y, c->w, c->h, c->line_thickness, c->color);
        } break;
        case NK_COMMAND_CIRCLE_FILLED: {
            const struct nk_command_circle_filled *c = (const struct nk_command_circle_filled *)cmd;
            nk_gdip_fill_circle(c->x, c->y, c->w, c->h, c->color);
        } break;
        case NK_COMMAND_TRIANGLE: {
            const struct nk_command_triangle*t = (const struct nk_command_triangle*)cmd;
            nk_gdip_stroke_triangle(t->a.x, t->a.y, t->b.x, t->b.y,
                t->c.x, t->c.y, t->line_thickness, t->color);
        } break;
        case NK_COMMAND_TRIANGLE_FILLED: {
            const struct nk_command_triangle_filled *t = (const struct nk_command_triangle_filled *)cmd;
            nk_gdip_fill_triangle(t->a.x, t->a.y, t->b.x, t->b.y,
                t->c.x, t->c.y, t->color);
        } break;
        case NK_COMMAND_POLYGON: {
            const struct nk_command_polygon *p =(const struct nk_command_polygon*)cmd;
            nk_gdip_stroke_polygon(p->points, p->point_count, p->line_thickness,p->color);
        } break;
        case NK_COMMAND_POLYGON_FILLED: {
            const struct nk_command_polygon_filled *p = (const struct nk_command_polygon_filled *)cmd;
            nk_gdip_fill_polygon(p->points, p->point_count, p->color);
        } break;
        case NK_COMMAND_POLYLINE: {
            const struct nk_command_polyline *p = (const struct nk_command_polyline *)cmd;
            nk_gdip_stroke_polyline(p->points, p->point_count, p->line_thickness, p->color);
        } break;
        case NK_COMMAND_TEXT: {
            const struct nk_command_text *t = (const struct nk_command_text*)cmd;
            nk_gdip_draw_text(t->x, t->y, t->w, t->h,
                (const char*)t->string, t->length,
                (GdipFont*)t->font->userdata.ptr,
                t->background, t->foreground);
        } break;
        case NK_COMMAND_CURVE: {
            const struct nk_command_curve *q = (const struct nk_command_curve *)cmd;
            nk_gdip_stroke_curve(q->begin, q->ctrl[0], q->ctrl[1],
                q->end, q->line_thickness, q->color);
        } break;
        case NK_COMMAND_RECT_MULTI_COLOR:
        case NK_COMMAND_IMAGE:
        case NK_COMMAND_ARC:
        case NK_COMMAND_ARC_FILLED:
        default: break;
        }
    }
    nk_gdip_blit(gdip.window);
    nk_clear(&gdip.ctx);
}

#endif