/* Copyright (C) 2001-2006 Artifex Software, Inc.
   All Rights Reserved.
  
   This software is provided AS-IS with no warranty, either express or
   implied.

   This software is distributed under license and may not be copied, modified
   or distributed except as expressly authorized under the terms of that
   license.  Refer to licensing information at http://www.artifex.com/
   or contact Artifex Software, Inc.,  7 Mt. Lassen Drive - Suite A-134,
   San Rafael, CA  94903, U.S.A., +1(415)492-9861, for further information.
*/

/* $Id: dwtrace.c 8604 2008-03-21 05:07:53Z leonardo $ */
/* Graphical trace server for Windows */

/*  This module use Win32-specific API.
    For 16-bit Windows many of functions compile to stubs.
*/

/*  fixme : Restoring image on WM_PAINT is NOT implemented yet.
*/

#define STRICT
#include <windows.h>
#include <math.h>
#include "dwimg.h"

static COLORREF WindowsColor(unsigned long c)
{   /*  This body uses a Windows specific macro RGB, which is being
        redefined in GS include files. Please include them after
        this definition.
    */
    return RGB(c >> 16, (c >> 8) & 255, c & 255);
}

#include "gscdefs.h"
#include "stdpre.h"
#include "gsdll.h"
#include "vdtrace.h"
#include "dwtrace.h"

struct vd_trace_host_s {
    bool inited;
    IMAGE * tw;
    HDC hdc;
    int count_GetDC;
    int window_height;
    int line_width;
    COLORREF color;
    HPEN pen, pen0;
    HBRUSH brush, brush0;
    double bx, by;
};

static struct vd_trace_host_s host = {false, NULL, NULL};
vd_trace_interface visual_tracer = { &host, 1, 1, 0, 0, 0, 0 };
static const char *vdtrace_ini = "gs_vdtrace.ini";

static void get_window()
{   if (!host.inited) {
        host.tw = image_new(NULL, NULL);	/* create and add to list */
        if (host.tw) {
            image_open(host.tw);
            UpdateWindow(host.tw->hwnd);
        }
	host.hdc = NULL;
	host.count_GetDC = 0;
	host.window_height = 100;
	host.line_width = 1;
	host.color = 0;
	host.inited = true;
    }
}

static inline int ScaleX(struct vd_trace_host_s *h, double x)
{   return (int)(x + 0.5);
}

static inline int ScaleY(struct vd_trace_host_s *h, double y)
{   return h->window_height - (int)(y + 0.5);
}

#define SX(x) ScaleX(I->host,x)
#define SY(y) ScaleY(I->host,y)

static inline void delete_pen_brush(vd_trace_interface *I)
{   SelectObject(I->host->hdc, I->host->pen0);
    SelectObject(I->host->hdc, I->host->brush0);
    if(I->host->pen != NULL)
	DeleteObject(I->host->pen);
    I->host->pen = NULL;
    if(I->host->brush != NULL)
	DeleteObject(I->host->brush);
    I->host->brush = NULL;
}

static inline void new_pen_brush(vd_trace_interface *I)
{   delete_pen_brush(I);
    I->host->pen = CreatePen(PS_SOLID, I->host->line_width, WindowsColor(I->host->color));
    I->host->brush = CreateSolidBrush(WindowsColor(I->host->color));
    SelectObject(I->host->hdc, I->host->pen);
    SelectObject(I->host->hdc, I->host->brush);
}

static double dw_gt_get_size_x(vd_trace_interface *I)
{   RECT r;
    get_window(); 
    if (host.tw == NULL) 
        return(100);
    GetClientRect(I->host->tw->hwnd,&r);
    return r.right - r.left;
}

static double dw_gt_get_size_y(vd_trace_interface *I)
{   RECT r;
    get_window(); 
    if (host.tw == NULL) 
        return(100);
    GetClientRect(I->host->tw->hwnd,&r);
    return r.bottom - r.top;
}

static void dw_gt_get_dc(vd_trace_interface *I, vd_trace_interface **I1)
{   get_window(); 
    if (host.tw == NULL) 
        return;
    if (I->host->hdc == NULL) {
	RECT r;
	I->host->hdc = GetDC(I->host->tw->hwnd);
	SetMapMode(I->host->hdc,MM_TEXT);
	GetClientRect(I->host->tw->hwnd, &r);
	I->host->window_height = r.bottom;
	SetBkMode(I->host->hdc,TRANSPARENT);
	I->host->pen0 = (HPEN)SelectObject(I->host->hdc, GetStockObject(BLACK_PEN));
	I->host->brush0 = (HBRUSH)SelectObject(I->host->hdc, GetStockObject(BLACK_BRUSH));
	I->host->color = 0;
	I->host->count_GetDC = 1;
        *I1 = I;
    } else
	++I->host->count_GetDC;
}

static void dw_gt_release_dc(vd_trace_interface *I, vd_trace_interface **I1)
{   get_window(); 
    if (host.tw == NULL) 
        return;
    --I->host->count_GetDC;
    if(I->host->count_GetDC == 0) {
	ReleaseDC(I->host->tw->hwnd, I->host->hdc);
	I->host->hdc = NULL;
	delete_pen_brush(I);
        *I1 = NULL;
    } else if(I->host->count_GetDC < 0) {
        /* safety : */
	I->host->count_GetDC = 0;
        *I1 = NULL;
    }
}

static void dw_gt_erase(vd_trace_interface *I, unsigned long rgbcolor)
{   HWND hwnd;
    RECT r;
    HBRUSH hbr;
    get_window(); 
    if (host.tw == NULL) 
        return;
    hwnd = I->host->tw->hwnd;
    GetClientRect(hwnd, &r);
    hbr = CreateSolidBrush(rgbcolor);
    FillRect(I->host->hdc, &r, hbr);
    DeleteObject(hbr);
}

static void dw_gt_beg_path(vd_trace_interface *I)
{   get_window(); 
    if (host.tw == NULL) 
        return;
    BeginPath(I->host->hdc);
}

static void dw_gt_end_path(vd_trace_interface *I)
{   get_window(); 
    if (host.tw == NULL) 
        return;
    EndPath(I->host->hdc);
}

static void dw_gt_moveto(vd_trace_interface *I, double x, double y)
{   POINT p;
    get_window(); 
    if (host.tw == NULL) 
        return;
#ifdef __WIN32__
    MoveToEx(I->host->hdc, SX(x), SY(y), &p);
#else
    MoveTo(I->host->hdc, SX(x), SY(y));
#endif
    I->host->bx = x; I->host->by = y;
}

static void dw_gt_lineto(vd_trace_interface *I, double x, double y)
{   get_window(); 
    if (host.tw == NULL) 
        return;
    LineTo(I->host->hdc, SX(x), SY(y));
}

static void dw_gt_curveto(vd_trace_interface *I, double x0, double y0, double x1, double y1, double x2, double y2)
{   POINT p[3];
    get_window(); 
    if (host.tw == NULL) 
        return;
    p[0].x = SX(x0), p[0].y = SY(y0);
    p[1].x = SX(x1), p[1].y = SY(y1);
    p[2].x = SX(x2), p[2].y = SY(y2);
    PolyBezierTo(I->host->hdc, p, 3);
}

static void dw_gt_closepath(vd_trace_interface *I)
{   get_window(); 
    if (host.tw == NULL) 
        return;
    LineTo(I->host->hdc, SX(I->host->bx), SY(I->host->by));
    CloseFigure(I->host->hdc);
}

static void dw_gt_circle(vd_trace_interface *I, double x, double y, int r)
{   HBRUSH h;
    get_window(); 
    if (host.tw == NULL) 
        return;
    h = (HBRUSH)SelectObject(I->host->hdc, GetStockObject(NULL_BRUSH));
    Ellipse(I->host->hdc, SX(x)-r, SY(y)-r, SX(x)+r, SY(y)+r);
    SelectObject(I->host->hdc, h);
}

static void dw_gt_round(vd_trace_interface *I, double x, double y, int r)
{   HPEN h;
    get_window(); 
    if (host.tw == NULL) 
        return;
    h = (HPEN)SelectObject(I->host->hdc, GetStockObject(NULL_PEN));
    Ellipse(I->host->hdc, SX(x)-r, SY(y)-r, SX(x)+r, SY(y)+r);
    SelectObject(I->host->hdc, h);
}

static void dw_gt_pixel(vd_trace_interface *I, double x, double y, unsigned long rgbcolor)
{   HPEN h;
    get_window(); 
    if (host.tw == NULL) 
        return;
    SetPixel(I->host->hdc, SX(x), SY(y), rgbcolor);
}

static void dw_gt_fill(vd_trace_interface *I)
{   get_window(); 
    if (host.tw == NULL) 
        return;
    FillPath(I->host->hdc);
}

static void dw_gt_stroke(vd_trace_interface *I)
{   get_window(); 
    if (host.tw == NULL) 
        return;
    StrokePath(I->host->hdc);
}

static void dw_gt_setcolor(vd_trace_interface *I, unsigned long rgbcolor)
{   get_window(); 
    if (host.tw == NULL) 
        return;
    if (I->host->color != rgbcolor) {
	I->host->color = rgbcolor;
	new_pen_brush(I);
	SetTextColor(I->host->hdc, rgbcolor);
    }
}

static void dw_gt_setlinewidth(vd_trace_interface *I, unsigned int width)
{   get_window(); 
    if (host.tw == NULL) 
        return;
    if (I->host->line_width != width) {
	I->host->line_width = width;
	new_pen_brush(I);
    }
}

static void dw_gt_text(vd_trace_interface *I, double x, double y, char *ASCIIZ)
{   get_window(); 
    if (host.tw == NULL) 
        return;
    TextOut(I->host->hdc, SX(x), SY(y), ASCIIZ, strlen(ASCIIZ));
}

static void dw_gt_wait(vd_trace_interface *I)
{   get_window(); 
    if (host.tw == NULL) 
        return;
    /* fixme : not implemented yet. */
}

static void dw_gt_set_scale(vd_trace_interface *I)
{   get_window(); 
    if (host.tw == NULL) 
        return;
    I->scale_x *= GetPrivateProfileInt("VDTRACE", "ScaleX", 1000, vdtrace_ini) / 1000.0;
    I->scale_y *= GetPrivateProfileInt("VDTRACE", "ScaleY", 1000, vdtrace_ini) / 1000.0;
}

static void dw_gt_set_shift(vd_trace_interface *I)
{   get_window(); 
    if (host.tw == NULL) 
        return;
    I->shift_x += (int)GetPrivateProfileInt("VDTRACE", "ShiftX", 0, vdtrace_ini);
    I->shift_y += (int)GetPrivateProfileInt("VDTRACE", "ShiftY", 0, vdtrace_ini);
}

static void dw_gt_set_origin(vd_trace_interface *I)
{   get_window(); 
    if (host.tw == NULL) 
        return;
    I->orig_x += (int)GetPrivateProfileInt("VDTRACE", "OrigX", 0, vdtrace_ini);
    I->orig_y += (int)GetPrivateProfileInt("VDTRACE", "OrigY", 0, vdtrace_ini);
}

#ifdef __WIN32__
#    define SET_CALLBACK(I,a) I.a = dw_gt_##a
#else
#    define SET_CALLBACK(I,a) I.a = 0
#endif

vd_trace_interface *visual_tracer_init(void)
{   SET_CALLBACK(visual_tracer, get_dc);
    SET_CALLBACK(visual_tracer, release_dc);
    SET_CALLBACK(visual_tracer, erase);
    SET_CALLBACK(visual_tracer, get_size_x);
    SET_CALLBACK(visual_tracer, get_size_y);
    SET_CALLBACK(visual_tracer, erase);
    SET_CALLBACK(visual_tracer, beg_path);
    SET_CALLBACK(visual_tracer, end_path);
    SET_CALLBACK(visual_tracer, moveto);
    SET_CALLBACK(visual_tracer, lineto);
    SET_CALLBACK(visual_tracer, curveto); /* optional */
    SET_CALLBACK(visual_tracer, closepath);
    SET_CALLBACK(visual_tracer, circle);
    SET_CALLBACK(visual_tracer, round);
    SET_CALLBACK(visual_tracer, pixel);
    SET_CALLBACK(visual_tracer, fill);
    SET_CALLBACK(visual_tracer, stroke);
    SET_CALLBACK(visual_tracer, setcolor);
    SET_CALLBACK(visual_tracer, setlinewidth);
    SET_CALLBACK(visual_tracer, text);
    SET_CALLBACK(visual_tracer, wait);
    SET_CALLBACK(visual_tracer, set_scale);
    SET_CALLBACK(visual_tracer, set_shift);
    SET_CALLBACK(visual_tracer, set_origin);
    return &visual_tracer;
}
        
void visual_tracer_close(void)
{   if (host.tw != NULL) {
        image_delete(host.tw);
        image_close(host.tw);
    }
}