119 lines
2.1 KiB
C
119 lines
2.1 KiB
C
/**
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* FreeRDP: A Remote Desktop Protocol Implementation
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* GDI LineTo
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*
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* Copyright 2010-2011 Marc-Andre Moreau <marcandre.moreau@gmail.com>
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/* do not include this file directly! */
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BOOL LINE_TO(HGDI_DC hdc, int nXEnd, int nYEnd)
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{
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int x, y;
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int x1, y1;
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int x2, y2;
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int e, e2;
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int dx, dy;
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int sx, sy;
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int bx1, by1;
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int bx2, by2;
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PIXEL_TYPE pen;
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PIXEL_TYPE* pixel;
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HGDI_BITMAP bmp;
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x1 = hdc->pen->posX;
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y1 = hdc->pen->posY;
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x2 = nXEnd;
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y2 = nYEnd;
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dx = (x1 > x2) ? x1 - x2 : x2 - x1;
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dy = (y1 > y2) ? y1 - y2 : y2 - y1;
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sx = (x1 < x2) ? 1 : -1;
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sy = (y1 < y2) ? 1 : -1;
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e = dx - dy;
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x = x1;
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y = y1;
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bmp = (HGDI_BITMAP) hdc->selectedObject;
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if (hdc->clip->null)
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{
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bx1 = (x1 < x2) ? x1 : x2;
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by1 = (y1 < y2) ? y1 : y2;
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bx2 = (x1 > x2) ? x1 : x2;
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by2 = (y1 > y2) ? y1 : y2;
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}
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else
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{
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bx1 = hdc->clip->x;
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by1 = hdc->clip->y;
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bx2 = bx1 + hdc->clip->w - 1;
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by2 = by1 + hdc->clip->h - 1;
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}
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bx1 = MAX(bx1, 0);
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by1 = MAX(by1, 0);
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bx2 = MIN(bx2, bmp->width - 1);
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by2 = MIN(by2, bmp->height - 1);
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if (!gdi_InvalidateRegion(hdc, bx1, by1, bx2 - bx1 + 1, by2 - by1 + 1))
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return FALSE;
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pen = GDI_GET_PEN_COLOR(hdc->pen);
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while (1)
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{
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if (!(x == x2 && y == y2))
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{
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if ((x >= bx1 && x <= bx2) && (y >= by1 && y <= by2))
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{
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pixel = GDI_GET_POINTER(bmp, x, y);
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SET_PIXEL_ROP2(pixel, &pen);
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}
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}
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else
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{
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break;
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}
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e2 = 2 * e;
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if (e2 > -dy)
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{
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e -= dy;
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x += sx;
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}
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if (e2 < dx)
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{
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e += dx;
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y += sy;
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}
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}
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return TRUE;
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}
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/*
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#undef LINE_TO
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#undef PIXEL_TYPE
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#undef SET_PIXEL_ROP2
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#undef GDI_GET_POINTER
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#undef GDI_GET_PEN_COLOR
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*/
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