draw.c

这是ARM嵌入式系统的实验教程中的MINIGUI的实验源代码！

/*
** $Id: draw.c,v 1.25 2004/04/19 06:10:33 snig Exp $
**
** General drawing of GDI
**
** Copyright (C) 2003 Feynman Software.
** Copyright (C) 2000 ~ 2002 Wei Yongming.
**
** Current maintainer: Wei Yongming.
** Create date: 2000/06/12, derived from original gdi.c
*/

/*
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

/*
** TODO:
*/ 

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "common.h"
#include "minigui.h"
#include "gdi.h"
#include "window.h"
#include "cliprect.h"
#include "gal.h"
#include "internals.h"
#include "ctrlclass.h"
#include "dc.h"
#include "cursor.h"

extern BOOL dc_GenerateECRgn (PDC pdc, BOOL fForce);

/*********************** Generl drawing support ******************************/
void GUIAPI SetPixel(HDC hdc, int x, int y, gal_pixel c)
{
    PDC pdc;
    PCLIPRECT pClipRect;
    RECT rcOutput;

    pdc = dc_HDC2PDC (hdc);

    if (dc_IsGeneralHDC(hdc)) {
        pthread_mutex_lock (&pdc->pGCRInfo->lock);
        if (!dc_GenerateECRgn (pdc, FALSE)) {
            pthread_mutex_unlock (&pdc->pGCRInfo->lock);
            return;
        }
    }

    coor_LP2SP (pdc, &x, &y);

    rcOutput.left = x - 1;
    rcOutput.top  = y - 1;
    rcOutput.right = x + 1;
    rcOutput.bottom = y + 1;

    pthread_mutex_lock (&__mg_gdilock);
    IntersectRect (&rcOutput, &rcOutput, &pdc->ecrgn.rcBound);
    if (!dc_IsMemHDC(hdc)) ShowCursorForGDI (FALSE, &rcOutput);

    // set graphics context.
    GAL_SetGC (pdc->gc);
    GAL_SetFgColor (pdc->gc, c);

    pClipRect = pdc->ecrgn.head;
    while(pClipRect)
    {
        if(PtInRect(&(pClipRect->rc), x, y)) {
            GAL_DrawPixel (pdc->gc, x, y, c);
            break;
        }
        pClipRect = pClipRect->next;
    }

    if( !dc_IsMemHDC(hdc) ) ShowCursorForGDI(TRUE, &rcOutput);
    pthread_mutex_unlock(&__mg_gdilock);

    if (dc_IsGeneralHDC(hdc)) pthread_mutex_unlock (&pdc->pGCRInfo->lock);
}

void GUIAPI SetPixelRGB(HDC hdc, int x, int y, int r, int g, int b)
{
    PDC pdc;
    PCLIPRECT pClipRect;
    RECT rcOutput;
    gal_pixel pixel;
    GAL_Color color;

    pdc = dc_HDC2PDC (hdc);

    if (dc_IsGeneralHDC(hdc)) {
        pthread_mutex_lock (&pdc->pGCRInfo->lock);
        if (!dc_GenerateECRgn (pdc, FALSE)) {
            pthread_mutex_unlock (&pdc->pGCRInfo->lock);
            return;
        }
    }

    coor_LP2SP (pdc, &x, &y);

    rcOutput.left = x - 1;
    rcOutput.top  = y - 1;
    rcOutput.right = x + 1;
    rcOutput.bottom = y + 1;

    pthread_mutex_lock (&__mg_gdilock);
    IntersectRect (&rcOutput, &rcOutput, &pdc->ecrgn.rcBound);
    if( !dc_IsMemHDC(hdc) ) ShowCursorForGDI(FALSE, &rcOutput);

    // set graphics context.
    GAL_SetGC (pdc->gc);

    color.r = r; color.g = g, color.b = b;
    pixel = GAL_MapColor (pdc->gc, &color);
    GAL_SetFgColor (pdc->gc, pixel);

    pClipRect = pdc->ecrgn.head;
    while (pClipRect)
    {
        if(PtInRect(&(pClipRect->rc), x, y)) {
            GAL_DrawPixel (pdc->gc, x, y, pixel);
            break;
        }
        pClipRect = pClipRect->next;
    }
    
    if( !dc_IsMemHDC(hdc) ) ShowCursorForGDI(TRUE, &rcOutput);
    pthread_mutex_unlock(&__mg_gdilock);
    if (dc_IsGeneralHDC(hdc)) pthread_mutex_unlock (&pdc->pGCRInfo->lock);
}

gal_pixel GUIAPI GetPixel(HDC hdc, int x, int y)
{
    PDC pdc;
    PCLIPRECT pClipRect;
    int color = 0;
    RECT rcOutput;

    pdc = dc_HDC2PDC(hdc);

    if (dc_IsGeneralHDC(hdc)) {
        pthread_mutex_lock (&pdc->pGCRInfo->lock);
        if (!dc_GenerateECRgn (pdc, FALSE)) {
            pthread_mutex_unlock (&pdc->pGCRInfo->lock);
            return PIXEL_invalid;
        }
    }

    coor_LP2SP (pdc, &x, &y);

    rcOutput.left = x - 1;
    rcOutput.top  = y - 1;
    rcOutput.right = x + 1;
    rcOutput.bottom = y + 1;

    pthread_mutex_lock (&__mg_gdilock);
    IntersectRect (&rcOutput, &rcOutput, &pdc->ecrgn.rcBound);
    if (!dc_IsMemHDC (hdc)) ShowCursorForGDI (FALSE, &rcOutput);

    // set graphics context.
    GAL_SetGC (pdc->gc);

    pClipRect = pdc->ecrgn.head;
    while(pClipRect)
    {
        if(PtInRect(&(pClipRect->rc), x, y)) {
            GAL_GetPixel (pdc->gc, x, y, &color);
            break;
        }
        pClipRect = pClipRect->next;
    }

    if (!dc_IsMemHDC (hdc)) ShowCursorForGDI (TRUE, &rcOutput);
    pthread_mutex_unlock(&__mg_gdilock);
    if (dc_IsGeneralHDC(hdc)) pthread_mutex_unlock (&pdc->pGCRInfo->lock);

    return color;
}

void GUIAPI GetPixelRGB(HDC hdc, int x, int y, int* r, int* g, int* b)
{
    PDC pdc;
    PCLIPRECT pClipRect;
    gal_pixel pixel;
    GAL_Color color;

    RECT rcOutput;

    pdc = dc_HDC2PDC(hdc);

    if (dc_IsGeneralHDC(hdc)) {
        pthread_mutex_lock (&pdc->pGCRInfo->lock);
        if (!dc_GenerateECRgn (pdc, FALSE)) {
            pthread_mutex_unlock (&pdc->pGCRInfo->lock);
            return;
        }
    }

    coor_LP2SP(pdc, &x, &y);

    rcOutput.left = x - 1;
    rcOutput.top  = y - 1;
    rcOutput.right = x + 1;
    rcOutput.bottom = y + 1;

    *r = 0;
    *g = 0;
    *b = 0;

    pthread_mutex_lock (&__mg_gdilock);
    IntersectRect (&rcOutput, &rcOutput, &pdc->ecrgn.rcBound);
    if (!dc_IsMemHDC (hdc)) ShowCursorForGDI (FALSE, &rcOutput);

    // set graphics context.
    GAL_SetGC (pdc->gc);

    pClipRect = pdc->ecrgn.head;
    while(pClipRect)
    {
        if (PtInRect (&(pClipRect->rc), x, y) ) {
            GAL_GetPixel (pdc->gc, x, y, &pixel);
            GAL_UnmapPixel (pdc->gc, pixel, &color);
            *r = color.r;
            *g = color.g;
            *b = color.b;
            break;
        }
        pClipRect = pClipRect->next;
    }

    if( !dc_IsMemHDC(hdc) ) ShowCursorForGDI(TRUE, &rcOutput);
    pthread_mutex_unlock(&__mg_gdilock);
    if (dc_IsGeneralHDC(hdc)) pthread_mutex_unlock (&pdc->pGCRInfo->lock);
}

gal_pixel GUIAPI RGB2Pixel (HDC hdc, int r, int g, int b)
{
    PDC pdc;
    gal_pixel pixel;
    GAL_Color color;

    color.r = r;
    color.g = g;
    color.b = b;
    
    pdc = dc_HDC2PDC (hdc);

    pthread_mutex_lock (&__mg_gdilock);

    GAL_SetGC (pdc->gc);
    pixel = GAL_MapColor (pdc->gc, &color);

    pthread_mutex_unlock (&__mg_gdilock);
 
    return pixel;
}

void GUIAPI MoveTo (HDC hdc, int x, int y)
{
    PDC pdc;

    pdc = dc_HDC2PDC(hdc);

    pdc->CurPenPos.x = x;
    pdc->CurPenPos.y = y;
}

void GUIAPI LineTo (HDC hdc, int x, int y)
{
    PCLIPRECT pClipRect;
    PDC pdc;
    RECT rcOutput;
    int startx, starty;

    pdc = dc_HDC2PDC(hdc);

    startx = pdc->CurPenPos.x;
    starty = pdc->CurPenPos.y;

    // Move the current pen pos.
    pdc->CurPenPos.x = x;