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Nuklear/demo/gdi_native_nuklear/nuklear_gdi.h

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/*
* Nuklear - 1.32.0 - public domain
* no warrenty implied; use at your own risk.
* authored from 2015-2016 by Micha Mettke
*
* Modified GDI backend 2022
* Now based on a context that is required for each API function call.
* Removes the global state --> you can have multiple windows :-)
*
*/
/*
* ==============================================================
*
* API
*
* ===============================================================
*/
#ifndef NK_GDI_H_
#define NK_GDI_H_
#ifdef __cplusplus
extern "C"{
#endif
typedef struct GdiFont GdiFont;
struct _nk_gdi_ctx;
typedef struct _nk_gdi_ctx* nk_gdi_ctx;
NK_API struct nk_context* nk_gdi_init(nk_gdi_ctx* gdi, GdiFont* font, HDC window_dc, unsigned int width, unsigned int height);
NK_API int nk_gdi_handle_event(nk_gdi_ctx gdi, HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam);
NK_API void nk_gdi_render(nk_gdi_ctx gdi, struct nk_color clear);
NK_API void nk_gdi_shutdown(nk_gdi_ctx gdi);
/* font */
NK_API GdiFont* nk_gdifont_create(const char* name, int size);
NK_API void nk_gdifont_del(GdiFont* font);
NK_API void nk_gdi_set_font(nk_gdi_ctx gdi, GdiFont* font);
#ifdef __cplusplus
}
#endif
#endif
/*
* ==============================================================
*
* IMPLEMENTATION
*
* ===============================================================
*/
#ifdef NK_GDI_IMPLEMENTATION
#include <string.h>
#include <stdlib.h>
#include <malloc.h>
struct GdiFont {
struct nk_user_font nk;
int height;
HFONT handle;
HDC dc;
};
struct _nk_gdi_ctx {
HBITMAP bitmap;
HDC window_dc;
HDC memory_dc;
unsigned int width;
unsigned int height;
struct nk_context ctx;
};
static void
nk_create_image(struct nk_image* image, const char* frame_buffer, const int width, const int height)
{
if (image && frame_buffer && (width > 0) && (height > 0))
{
const unsigned char* src = (const unsigned char*)frame_buffer;
INT row = ((width * 3 + 3) & ~3);
LPBYTE lpBuf, pb = NULL;
BITMAPINFO bi = { 0 };
HBITMAP hbm;
int v, i;
image->w = width;
image->h = height;
image->region[0] = 0;
image->region[1] = 0;
image->region[2] = width;
image->region[3] = height;
bi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
bi.bmiHeader.biWidth = width;
bi.bmiHeader.biHeight = height;
bi.bmiHeader.biPlanes = 1;
bi.bmiHeader.biBitCount = 24;
bi.bmiHeader.biCompression = BI_RGB;
bi.bmiHeader.biSizeImage = row * height;
hbm = CreateDIBSection(NULL, &bi, DIB_RGB_COLORS, (void**)&lpBuf, NULL, 0);
pb = lpBuf + row * height;
for (v = 0; v < height; v++)
{
pb -= row;
for (i = 0; i < row; i += 3)
{
pb[i + 0] = src[0];
pb[i + 1] = src[1];
pb[i + 2] = src[2];
src += 3;
}
}
SetDIBits(NULL, hbm, 0, height, lpBuf, &bi, DIB_RGB_COLORS);
image->handle.ptr = hbm;
}
}
static void
nk_delete_image(struct nk_image* image)
{
if (image && image->handle.id != 0)
{
HBITMAP hbm = (HBITMAP)image->handle.ptr;
DeleteObject(hbm);
memset(image, 0, sizeof(struct nk_image));
}
}
static void
nk_gdi_draw_image(nk_gdi_ctx gdi, short x, short y, unsigned short w, unsigned short h,
struct nk_image img, struct nk_color col)
{
HBITMAP hbm = (HBITMAP)img.handle.ptr;
HDC hDCBits;
BITMAP bitmap;
if (!gdi->memory_dc || !hbm)
return;
hDCBits = CreateCompatibleDC(gdi->memory_dc);
GetObject(hbm, sizeof(BITMAP), (LPSTR)&bitmap);
SelectObject(hDCBits, hbm);
StretchBlt(gdi->memory_dc, x, y, w, h, hDCBits, 0, 0, bitmap.bmWidth, bitmap.bmHeight, SRCCOPY);
DeleteDC(hDCBits);
}
static COLORREF
convert_color(struct nk_color c)
{
return c.r | (c.g << 8) | (c.b << 16);
}
static void
nk_gdi_scissor(HDC dc, float x, float y, float w, float h)
{
SelectClipRgn(dc, NULL);
IntersectClipRect(dc, (int)x, (int)y, (int)(x + w + 1), (int)(y + h + 1));
}
static void
nk_gdi_stroke_line(HDC dc, short x0, short y0, short x1,
short y1, unsigned int line_thickness, struct nk_color col)
{
COLORREF color = convert_color(col);
HPEN pen = NULL;
if (line_thickness == 1) {
SetDCPenColor(dc, color);
}
else {
pen = CreatePen(PS_SOLID, line_thickness, color);
SelectObject(dc, pen);
}
MoveToEx(dc, x0, y0, NULL);
LineTo(dc, x1, y1);
if (pen) {
SelectObject(dc, GetStockObject(DC_PEN));
DeleteObject(pen);
}
}
static void
nk_gdi_stroke_rect(HDC dc, short x, short y, unsigned short w,
unsigned short h, unsigned short r, unsigned short line_thickness, struct nk_color col)
{
COLORREF color = convert_color(col);
HGDIOBJ br;
HPEN pen = NULL;
if (line_thickness == 1) {
SetDCPenColor(dc, color);
}
else {
pen = CreatePen(PS_SOLID, line_thickness, color);
SelectObject(dc, pen);
}
br = SelectObject(dc, GetStockObject(NULL_BRUSH));
if (r == 0) {
Rectangle(dc, x, y, x + w, y + h);
}
else {
RoundRect(dc, x, y, x + w, y + h, r, r);
}
SelectObject(dc, br);
if (pen) {
SelectObject(dc, GetStockObject(DC_PEN));
DeleteObject(pen);
}
}
static void
nk_gdi_fill_rect(HDC dc, short x, short y, unsigned short w,
unsigned short h, unsigned short r, struct nk_color col)
{
COLORREF color = convert_color(col);
if (r == 0) {
RECT rect;
SetRect(&rect, x, y, x + w, y + h);
SetBkColor(dc, color);
ExtTextOutW(dc, 0, 0, ETO_OPAQUE, &rect, NULL, 0, NULL);
}
else {
SetDCPenColor(dc, color);
SetDCBrushColor(dc, color);
RoundRect(dc, x, y, x + w, y + h, r, r);
}
}
static void
nk_gdi_set_vertexColor(PTRIVERTEX tri, struct nk_color col)
{
tri->Red = col.r << 8;
tri->Green = col.g << 8;
tri->Blue = col.b << 8;
tri->Alpha = 0xff << 8;
}
static void
nk_gdi_rect_multi_color(nk_gdi_ctx gdi, HDC dc, short x, short y, unsigned short w,
unsigned short h, struct nk_color left, struct nk_color top,
struct nk_color right, struct nk_color bottom)
{
BLENDFUNCTION alphaFunction;
// GRADIENT_RECT gRect;
GRADIENT_TRIANGLE gTri[2];
TRIVERTEX vt[4];
alphaFunction.BlendOp = AC_SRC_OVER;
alphaFunction.BlendFlags = 0;
alphaFunction.SourceConstantAlpha = 0;
alphaFunction.AlphaFormat = AC_SRC_ALPHA;
/* TODO: This Case Needs Repair.*/
/* Top Left Corner */
vt[0].x = x;
vt[0].y = y;
nk_gdi_set_vertexColor(&vt[0], left);
/* Top Right Corner */
vt[1].x = x + w;
vt[1].y = y;
nk_gdi_set_vertexColor(&vt[1], top);
/* Bottom Left Corner */
vt[2].x = x;
vt[2].y = y + h;
nk_gdi_set_vertexColor(&vt[2], right);
/* Bottom Right Corner */
vt[3].x = x + w;
vt[3].y = y + h;
nk_gdi_set_vertexColor(&vt[3], bottom);
gTri[0].Vertex1 = 0;
gTri[0].Vertex2 = 1;
gTri[0].Vertex3 = 2;
gTri[1].Vertex1 = 2;
gTri[1].Vertex2 = 1;
gTri[1].Vertex3 = 3;
GdiGradientFill(dc, vt, 4, gTri, 2, GRADIENT_FILL_TRIANGLE);
AlphaBlend(gdi->window_dc, x, y, x + w, y + h, gdi->memory_dc, x, y, x + w, y + h, alphaFunction);
}
static BOOL
SetPoint(POINT* p, LONG x, LONG y)
{
if (!p)
return FALSE;
p->x = x;
p->y = y;
return TRUE;
}
static void
nk_gdi_fill_triangle(HDC dc, short x0, short y0, short x1,
short y1, short x2, short y2, struct nk_color col)
{
COLORREF color = convert_color(col);
POINT points[3];
SetPoint(&points[0], x0, y0);
SetPoint(&points[1], x1, y1);
SetPoint(&points[2], x2, y2);
SetDCPenColor(dc, color);
SetDCBrushColor(dc, color);
Polygon(dc, points, 3);
}
static void
nk_gdi_stroke_triangle(HDC dc, short x0, short y0, short x1,
short y1, short x2, short y2, unsigned short line_thickness, struct nk_color col)
{
COLORREF color = convert_color(col);
POINT points[4];
HPEN pen = NULL;
SetPoint(&points[0], x0, y0);
SetPoint(&points[1], x1, y1);
SetPoint(&points[2], x2, y2);
SetPoint(&points[3], x0, y0);
if (line_thickness == 1) {
SetDCPenColor(dc, color);
}
else {
pen = CreatePen(PS_SOLID, line_thickness, color);
SelectObject(dc, pen);
}
Polyline(dc, points, 4);
if (pen) {
SelectObject(dc, GetStockObject(DC_PEN));
DeleteObject(pen);
}
}
static void
nk_gdi_fill_polygon(HDC dc, const struct nk_vec2i* pnts, int count, struct nk_color col)
{
int i = 0;
#define MAX_POINTS 64
POINT points[MAX_POINTS];
COLORREF color = convert_color(col);
SetDCBrushColor(dc, color);
SetDCPenColor(dc, color);
for (i = 0; i < count && i < MAX_POINTS; ++i) {
points[i].x = pnts[i].x;
points[i].y = pnts[i].y;
}
Polygon(dc, points, i);
#undef MAX_POINTS
}
static void
nk_gdi_stroke_polygon(HDC dc, const struct nk_vec2i* pnts, int count,
unsigned short line_thickness, struct nk_color col)
{
COLORREF color = convert_color(col);
HPEN pen = NULL;
if (line_thickness == 1) {
SetDCPenColor(dc, color);
}
else {
pen = CreatePen(PS_SOLID, line_thickness, color);
SelectObject(dc, pen);
}
if (count > 0) {
int i;
MoveToEx(dc, pnts[0].x, pnts[0].y, NULL);
for (i = 1; i < count; ++i)
LineTo(dc, pnts[i].x, pnts[i].y);
LineTo(dc, pnts[0].x, pnts[0].y);
}
if (pen) {
SelectObject(dc, GetStockObject(DC_PEN));
DeleteObject(pen);
}
}
static void
nk_gdi_stroke_polyline(HDC dc, const struct nk_vec2i* pnts,
int count, unsigned short line_thickness, struct nk_color col)
{
COLORREF color = convert_color(col);
HPEN pen = NULL;
if (line_thickness == 1) {
SetDCPenColor(dc, color);
}
else {
pen = CreatePen(PS_SOLID, line_thickness, color);
SelectObject(dc, pen);
}
if (count > 0) {
int i;
MoveToEx(dc, pnts[0].x, pnts[0].y, NULL);
for (i = 1; i < count; ++i)
LineTo(dc, pnts[i].x, pnts[i].y);
}
if (pen) {
SelectObject(dc, GetStockObject(DC_PEN));
DeleteObject(pen);
}
}
static void
nk_gdi_fill_circle(HDC dc, short x, short y, unsigned short w,
unsigned short h, struct nk_color col)
{
COLORREF color = convert_color(col);
SetDCBrushColor(dc, color);
SetDCPenColor(dc, color);
Ellipse(dc, x, y, x + w, y + h);
}
static void
nk_gdi_stroke_circle(HDC dc, short x, short y, unsigned short w,
unsigned short h, unsigned short line_thickness, struct nk_color col)
{
COLORREF color = convert_color(col);
HPEN pen = NULL;
if (line_thickness == 1) {
SetDCPenColor(dc, color);
}
else {
pen = CreatePen(PS_SOLID, line_thickness, color);
SelectObject(dc, pen);
}
SetDCBrushColor(dc, OPAQUE);
Ellipse(dc, x, y, x + w, y + h);
if (pen) {
SelectObject(dc, GetStockObject(DC_PEN));
DeleteObject(pen);
}
}
static void
nk_gdi_stroke_curve(HDC dc, struct nk_vec2i p1,
struct nk_vec2i p2, struct nk_vec2i p3, struct nk_vec2i p4,
unsigned short line_thickness, struct nk_color col)
{
COLORREF color = convert_color(col);
POINT p[4];
HPEN pen = NULL;
SetPoint(&p[0], p1.x, p1.y);
SetPoint(&p[1], p2.x, p2.y);
SetPoint(&p[2], p3.x, p3.y);
SetPoint(&p[3], p4.x, p4.y);
if (line_thickness == 1) {
SetDCPenColor(dc, color);
}
else {
pen = CreatePen(PS_SOLID, line_thickness, color);
SelectObject(dc, pen);
}
SetDCBrushColor(dc, OPAQUE);
PolyBezier(dc, p, 4);
if (pen) {
SelectObject(dc, GetStockObject(DC_PEN));
DeleteObject(pen);
}
}
static void
nk_gdi_draw_text(HDC dc, short x, short y, unsigned short w, unsigned short h,
const char* text, int len, GdiFont* font, struct nk_color cbg, struct nk_color cfg)
{
int wsize;
WCHAR* wstr;
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);
SetBkColor(dc, convert_color(cbg));
SetTextColor(dc, convert_color(cfg));
SelectObject(dc, font->handle);
ExtTextOutW(dc, x, y, ETO_OPAQUE, NULL, wstr, wsize, NULL);
}
static void
nk_gdi_clear(nk_gdi_ctx gdi, HDC dc, struct nk_color col)
{
COLORREF color = convert_color(col);
RECT rect;
SetRect(&rect, 0, 0, gdi->width, gdi->height);
SetBkColor(dc, color);
ExtTextOutW(dc, 0, 0, ETO_OPAQUE, &rect, NULL, 0, NULL);
}
static void
nk_gdi_blit(nk_gdi_ctx gdi, HDC dc)
{
BitBlt(dc, 0, 0, gdi->width, gdi->height, gdi->memory_dc, 0, 0, SRCCOPY);
}
GdiFont*
nk_gdifont_create(const char* name, int size)
{
TEXTMETRICW metric;
GdiFont* font = (GdiFont*)calloc(1, sizeof(GdiFont));
if (!font)
return NULL;
font->dc = CreateCompatibleDC(0);
font->handle = CreateFontA(size, 0, 0, 0, FW_NORMAL, FALSE, FALSE, FALSE, DEFAULT_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS, CLEARTYPE_QUALITY, DEFAULT_PITCH | FF_DONTCARE, name);
SelectObject(font->dc, font->handle);
GetTextMetricsW(font->dc, &metric);
font->height = metric.tmHeight;
return font;
}
static float
nk_gdifont_get_text_width(nk_handle handle, float height, const char* text, int len)
{
GdiFont* font = (GdiFont*)handle.ptr;
SIZE size;
int wsize;
WCHAR* wstr;
if (!font || !text)
return 0;
wsize = MultiByteToWideChar(CP_UTF8, 0, text, len, NULL, 0);
wstr = (WCHAR*)_alloca(wsize * sizeof(wchar_t));
MultiByteToWideChar(CP_UTF8, 0, text, len, wstr, wsize);
if (GetTextExtentPoint32W(font->dc, wstr, wsize, &size))
return (float)size.cx;
return -1.0f;
}
void
nk_gdifont_del(GdiFont* font)
{
if (!font) return;
DeleteObject(font->handle);
DeleteDC(font->dc);
free(font);
}
static void
nk_gdi_clipboard_paste(nk_handle usr, struct nk_text_edit* edit)
{
(void)usr;
if (IsClipboardFormatAvailable(CF_UNICODETEXT) && OpenClipboard(NULL))
{
HGLOBAL mem = GetClipboardData(CF_UNICODETEXT);
if (mem)
{
SIZE_T size = GlobalSize(mem) - 1;
if (size)
{
LPCWSTR wstr = (LPCWSTR)GlobalLock(mem);
if (wstr)
{
int utf8size = WideCharToMultiByte(CP_UTF8, 0, wstr, (int)(size / sizeof(wchar_t)), NULL, 0, NULL, NULL);
if (utf8size)
{
char* utf8 = (char*)malloc(utf8size);
if (utf8)
{
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_gdi_clipboard_copy(nk_handle usr, const char* text, int len)
{
if (OpenClipboard(NULL))
{
int wsize = MultiByteToWideChar(CP_UTF8, 0, text, len, NULL, 0);
if (wsize)
{
HGLOBAL mem = (HGLOBAL)GlobalAlloc(GMEM_MOVEABLE, (wsize + 1) * sizeof(wchar_t));
if (mem)
{
wchar_t* wstr = (wchar_t*)GlobalLock(mem);
if (wstr)
{
MultiByteToWideChar(CP_UTF8, 0, text, len, wstr, wsize);
wstr[wsize] = 0;
GlobalUnlock(mem);
SetClipboardData(CF_UNICODETEXT, mem);
}
}
}
CloseClipboard();
}
}
NK_API struct nk_context*
nk_gdi_init(nk_gdi_ctx* gdi, GdiFont* gdifont, HDC window_dc, unsigned int width, unsigned int height)
{
*gdi = (nk_gdi_ctx)malloc(sizeof(struct _nk_gdi_ctx));
struct nk_user_font* font = &gdifont->nk;
font->userdata = nk_handle_ptr(gdifont);
font->height = (float)gdifont->height;
font->width = nk_gdifont_get_text_width;
(*gdi)->bitmap = CreateCompatibleBitmap(window_dc, width, height);
(*gdi)->window_dc = window_dc;
(*gdi)->memory_dc = CreateCompatibleDC(window_dc);
(*gdi)->width = width;
(*gdi)->height = height;
SelectObject((*gdi)->memory_dc, (*gdi)->bitmap);
nk_init_default(&(*gdi)->ctx, font);
(*gdi)->ctx.clip.copy = nk_gdi_clipboard_copy;
(*gdi)->ctx.clip.paste = nk_gdi_clipboard_paste;
return &(*gdi)->ctx;
}
NK_API void
nk_gdi_set_font(nk_gdi_ctx gdi, GdiFont* gdifont)
{
struct nk_user_font* font = &gdifont->nk;
font->userdata = nk_handle_ptr(gdifont);
font->height = (float)gdifont->height;
font->width = nk_gdifont_get_text_width;
nk_style_set_font(&gdi->ctx, font);
}
NK_API int
nk_gdi_handle_event(nk_gdi_ctx gdi, HWND wnd, UINT msg, WPARAM wparam, LPARAM lparam)
{
switch (msg)
{
case WM_SIZE:
{
unsigned width = LOWORD(lparam);
unsigned height = HIWORD(lparam);
if (width != gdi->width || height != gdi->height)
{
DeleteObject(gdi->bitmap);
gdi->bitmap = CreateCompatibleBitmap(gdi->window_dc, width, height);
gdi->width = width;
gdi->height = height;
SelectObject(gdi->memory_dc, gdi->bitmap);
}
break;
}
case WM_PAINT:
{
PAINTSTRUCT paint;
HDC dc = BeginPaint(wnd, &paint);
nk_gdi_blit(gdi, dc);
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(&gdi->ctx, NK_KEY_SHIFT, down);
return 1;
case VK_DELETE:
nk_input_key(&gdi->ctx, NK_KEY_DEL, down);
return 1;
case VK_RETURN:
nk_input_key(&gdi->ctx, NK_KEY_ENTER, down);
return 1;
case VK_TAB:
nk_input_key(&gdi->ctx, NK_KEY_TAB, down);
return 1;
case VK_LEFT:
if (ctrl)
nk_input_key(&gdi->ctx, NK_KEY_TEXT_WORD_LEFT, down);
else
nk_input_key(&gdi->ctx, NK_KEY_LEFT, down);
return 1;
case VK_RIGHT:
if (ctrl)
nk_input_key(&gdi->ctx, NK_KEY_TEXT_WORD_RIGHT, down);
else
nk_input_key(&gdi->ctx, NK_KEY_RIGHT, down);
return 1;
case VK_BACK:
nk_input_key(&gdi->ctx, NK_KEY_BACKSPACE, down);
return 1;
case VK_HOME:
nk_input_key(&gdi->ctx, NK_KEY_TEXT_START, down);
nk_input_key(&gdi->ctx, NK_KEY_SCROLL_START, down);
return 1;
case VK_END:
nk_input_key(&gdi->ctx, NK_KEY_TEXT_END, down);
nk_input_key(&gdi->ctx, NK_KEY_SCROLL_END, down);
return 1;
case VK_NEXT:
nk_input_key(&gdi->ctx, NK_KEY_SCROLL_DOWN, down);
return 1;
case VK_PRIOR:
nk_input_key(&gdi->ctx, NK_KEY_SCROLL_UP, down);
return 1;
case 'C':
if (ctrl) {
nk_input_key(&gdi->ctx, NK_KEY_COPY, down);
return 1;
}
break;
case 'V':
if (ctrl) {
nk_input_key(&gdi->ctx, NK_KEY_PASTE, down);
return 1;
}
break;
case 'X':
if (ctrl) {
nk_input_key(&gdi->ctx, NK_KEY_CUT, down);
return 1;
}
break;
case 'Z':
if (ctrl) {
nk_input_key(&gdi->ctx, NK_KEY_TEXT_UNDO, down);
return 1;
}
break;
case 'R':
if (ctrl) {
nk_input_key(&gdi->ctx, NK_KEY_TEXT_REDO, down);
return 1;
}
break;
}
return 0;
}
case WM_CHAR:
if (wparam >= 32)
{
nk_input_unicode(&gdi->ctx, (nk_rune)wparam);
return 1;
}
break;
case WM_LBUTTONDOWN:
nk_input_button(&gdi->ctx, NK_BUTTON_LEFT, (short)LOWORD(lparam), (short)HIWORD(lparam), 1);
SetCapture(wnd);
return 1;
case WM_LBUTTONUP:
nk_input_button(&gdi->ctx, NK_BUTTON_DOUBLE, (short)LOWORD(lparam), (short)HIWORD(lparam), 0);
nk_input_button(&gdi->ctx, NK_BUTTON_LEFT, (short)LOWORD(lparam), (short)HIWORD(lparam), 0);
ReleaseCapture();
return 1;
case WM_RBUTTONDOWN:
nk_input_button(&gdi->ctx, NK_BUTTON_RIGHT, (short)LOWORD(lparam), (short)HIWORD(lparam), 1);
SetCapture(wnd);
return 1;
case WM_RBUTTONUP:
nk_input_button(&gdi->ctx, NK_BUTTON_RIGHT, (short)LOWORD(lparam), (short)HIWORD(lparam), 0);
ReleaseCapture();
return 1;
case WM_MBUTTONDOWN:
nk_input_button(&gdi->ctx, NK_BUTTON_MIDDLE, (short)LOWORD(lparam), (short)HIWORD(lparam), 1);
SetCapture(wnd);
return 1;
case WM_MBUTTONUP:
nk_input_button(&gdi->ctx, NK_BUTTON_MIDDLE, (short)LOWORD(lparam), (short)HIWORD(lparam), 0);
ReleaseCapture();
return 1;
case WM_MOUSEWHEEL:
nk_input_scroll(&gdi->ctx, nk_vec2(0, (float)(short)HIWORD(wparam) / WHEEL_DELTA));
return 1;
case WM_MOUSEMOVE:
nk_input_motion(&gdi->ctx, (short)LOWORD(lparam), (short)HIWORD(lparam));
return 1;
case WM_LBUTTONDBLCLK:
nk_input_button(&gdi->ctx, NK_BUTTON_DOUBLE, (short)LOWORD(lparam), (short)HIWORD(lparam), 1);
return 1;
}
return 0;
}
NK_API void
nk_gdi_shutdown(nk_gdi_ctx gdi)
{
DeleteObject(gdi->memory_dc);
DeleteObject(gdi->bitmap);
nk_free(&gdi->ctx);
}
NK_API void
nk_gdi_render(nk_gdi_ctx gdi, struct nk_color clear)
{
const struct nk_command* cmd;
HDC memory_dc = gdi->memory_dc;
SelectObject(memory_dc, GetStockObject(DC_PEN));
SelectObject(memory_dc, GetStockObject(DC_BRUSH));
nk_gdi_clear(gdi, memory_dc, clear);
nk_foreach(cmd, &gdi->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_gdi_scissor(memory_dc, 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_gdi_stroke_line(memory_dc, 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_gdi_stroke_rect(memory_dc, 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_gdi_fill_rect(memory_dc, 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_gdi_stroke_circle(memory_dc, 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_gdi_fill_circle(memory_dc, 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_gdi_stroke_triangle(memory_dc, 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_gdi_fill_triangle(memory_dc, 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_gdi_stroke_polygon(memory_dc, 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_gdi_fill_polygon(memory_dc, 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_gdi_stroke_polyline(memory_dc, 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_gdi_draw_text(memory_dc, t->x, t->y, t->w, t->h,
(const char*)t->string, t->length,
(GdiFont*)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_gdi_stroke_curve(memory_dc, q->begin, q->ctrl[0], q->ctrl[1],
q->end, q->line_thickness, q->color);
} break;
case NK_COMMAND_RECT_MULTI_COLOR: {
const struct nk_command_rect_multi_color* r = (const struct nk_command_rect_multi_color*)cmd;
nk_gdi_rect_multi_color(gdi, memory_dc, r->x, r->y, r->w, r->h, r->left, r->top, r->right, r->bottom);
} break;
case NK_COMMAND_IMAGE: {
const struct nk_command_image* i = (const struct nk_command_image*)cmd;
nk_gdi_draw_image(gdi, i->x, i->y, i->w, i->h, i->img, i->col);
} break;
case NK_COMMAND_ARC:
case NK_COMMAND_ARC_FILLED:
default: break;
}
}
nk_gdi_blit(gdi, gdi->window_dc);
nk_clear(&gdi->ctx);
}
#endif
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