mirror of https://github.com/jonthysell/MacLO.git
63 lines
1.8 KiB
C
63 lines
1.8 KiB
C
// Copyright (c) Jon Thysell <http://jonthysell.com>
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// Licensed under the MIT License.
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/**
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* @file WindowBuffer.c
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*
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* This file provides implementations for WindowBuffer.h.
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*/
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#include "WindowBuffer.h"
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#include "MacCommon.h"
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void WindowBuffer_Init(WindowBuffer *pWindowBuffer, const WindowPtr window)
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{
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int16_t width, height;
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BitMap newBits;
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pWindowBuffer->Window = window;
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// Create a BitMap as the backing for the buffer,
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// since System 6 doesn't have fancy GWorlds
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width = window->portRect.right - window->portRect.left;
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height = window->portRect.bottom - window->portRect.top;
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SetRect(&newBits.bounds, 0, 0, width, height);
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newBits.rowBytes = ((width + 31)/32) * 4;
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newBits.baseAddr = NewPtr(height * newBits.rowBytes);
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// Clear the bitmap
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CopyBits(&newBits,
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&newBits,
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&newBits.bounds,
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&newBits.bounds,
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srcXor,
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nil);
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// Create the buffer and get it ready
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pWindowBuffer->Buffer = (GrafPtr)NewPtr(sizeof(GrafPort));
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OpenPort(pWindowBuffer->Buffer);
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SetPort(pWindowBuffer->Buffer);
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pWindowBuffer->Buffer->portRect = newBits.bounds;
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RectRgn(pWindowBuffer->Buffer->visRgn, &newBits.bounds);
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SetPortBits(&newBits);
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}
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void WindowBuffer_StartDraw(const WindowBuffer *pWindowBuffer)
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{
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// Set the buffer as the port for future QuickDraw commands
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SetPort(pWindowBuffer->Buffer);
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}
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void WindowBuffer_EndDraw(const WindowBuffer *pWindowBuffer)
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{
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SetPort(pWindowBuffer->Window);
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// Copy the buffer to the window
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CopyBits(&(pWindowBuffer->Buffer->portBits),
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&(pWindowBuffer->Window->portBits),
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&(pWindowBuffer->Buffer->portRect),
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&(pWindowBuffer->Window->portRect),
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srcCopy, nil);
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}
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