forked from minhngoc25a/freetype2
79 lines
1.9 KiB
C
79 lines
1.9 KiB
C
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#include "grobjs.h"
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#include "grdevice.h"
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#include <stdio.h>
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#define GR_INIT_DEVICE_CHAIN ((grDeviceChain*)0)
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#define GR_INIT_BUILD
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#ifdef DEVICE_X11
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#include "grx11.h"
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#endif
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#ifdef DEVICE_OS2_PM
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#include "gros2pm.h"
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#endif
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/**********************************************************************
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*
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* <Function>
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* grInitDevices
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*
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* <Description>
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* This function is in charge of initialising all system-specific
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* devices. A device is responsible for creating and managing one
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* or more "surfaces". A surface is either a window or a screen,
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* depending on the system.
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*
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* <Return>
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* a pointer to the first element of a device chain. The chain can
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* be parsed to find the available devices on the current system
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*
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* <Note>
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* If a device cannot be initialised correctly, it is not part of
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* the device chain returned by this function. For example, if an
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* X11 device was compiled in the library, it will be part of
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* the returned device chain only if a connection to the display
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* could be establisged
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*
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* If no driver could be initialised, this function returns NULL.
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*
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**********************************************************************/
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extern
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grDeviceChain* grInitDevices( void )
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{
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grDeviceChain* chain = GR_INIT_DEVICE_CHAIN;
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grDeviceChain* cur = gr_device_chain;
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while (chain)
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{
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/* initialie the device */
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grDevice* device;
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device = chain->device;
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if ( device->init() == 0 &&
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gr_num_devices < GR_MAX_DEVICES )
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{
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/* successful device initialisation - add it to our chain */
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cur->next = 0;
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cur->device = device;
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cur->name = device->device_name;
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if (cur > gr_device_chain)
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cur[-1].next = cur;
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cur++;
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gr_num_devices++;
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}
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chain = chain->next;
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}
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return (gr_num_devices > 0 ? gr_device_chain : 0 );
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}
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