ref: e132bd497bbd153e369bfa9e9d83cbc1f0702dab
dir: /src/v_diskicon.c/
// // Copyright(C) 1993-1996 Id Software, Inc. // Copyright(C) 2005-2014 Simon Howard // // 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. // // DESCRIPTION: // Disk load indicator. // #include "doomtype.h" #include "deh_str.h" #include "i_swap.h" #include "i_video.h" #include "m_argv.h" #include "v_video.h" #include "w_wad.h" #include "z_zone.h" #include "v_diskicon.h" // Only display the disk icon if more then this much bytes have been read // during the previous tic. static const int diskicon_threshold = 20*1024; // Two buffers: disk_data contains the data representing the disk icon // (raw, not a patch_t) while saved_background is an equivalently-sized // buffer where we save the background data while the disk is on screen. static byte *disk_data; static byte *saved_background; static int loading_disk_xoffs = 0; static int loading_disk_yoffs = 0; // Number of bytes read since the last call to V_DrawDiskIcon(). static size_t recent_bytes_read = 0; static boolean disk_drawn; static void CopyRegion(byte *dest, int dest_pitch, byte *src, int src_pitch, int w, int h) { byte *s, *d; int y; s = src; d = dest; for (y = 0; y < h; ++y) { memcpy(d, s, w); s += src_pitch; d += dest_pitch; } } static void SaveDiskData(char *disk_lump, int xoffs, int yoffs) { byte *tmpscreen; patch_t *disk; // Allocate a complete temporary screen where we'll draw the patch. tmpscreen = Z_Malloc(SCREENWIDTH * SCREENHEIGHT, PU_STATIC, NULL); memset(tmpscreen, 0, SCREENWIDTH * SCREENHEIGHT); V_UseBuffer(tmpscreen); // Buffer where we'll save the disk data. disk_data = Z_Malloc(LOADING_DISK_W * LOADING_DISK_H, PU_STATIC, NULL); // Draw the patch and save the result to disk_data. disk = W_CacheLumpName(disk_lump, PU_STATIC); V_DrawPatch(loading_disk_xoffs, loading_disk_yoffs, disk); CopyRegion(disk_data, LOADING_DISK_W, tmpscreen + yoffs * SCREENWIDTH + xoffs, SCREENWIDTH, LOADING_DISK_W, LOADING_DISK_H); W_ReleaseLumpName(disk_lump); V_RestoreBuffer(); Z_Free(tmpscreen); } void V_EnableLoadingDisk(char *lump_name, int xoffs, int yoffs) { loading_disk_xoffs = xoffs; loading_disk_yoffs = yoffs; saved_background = Z_Malloc(LOADING_DISK_W * LOADING_DISK_H, PU_STATIC, NULL); SaveDiskData(lump_name, xoffs, yoffs); } void V_BeginRead(size_t nbytes) { recent_bytes_read += nbytes; } static byte *DiskRegionPointer(void) { return I_VideoBuffer + loading_disk_yoffs * SCREENWIDTH + loading_disk_xoffs; } void V_DrawDiskIcon(void) { if (disk_data != NULL && recent_bytes_read > diskicon_threshold) { // Save the background behind the disk before we draw it. CopyRegion(saved_background, LOADING_DISK_W, DiskRegionPointer(), SCREENWIDTH, LOADING_DISK_W, LOADING_DISK_H); // Write the disk to the screen buffer. CopyRegion(DiskRegionPointer(), SCREENWIDTH, disk_data, LOADING_DISK_W, LOADING_DISK_W, LOADING_DISK_H); disk_drawn = true; } recent_bytes_read = 0; } void V_RestoreDiskBackground(void) { if (disk_drawn) { // Restore the background. CopyRegion(DiskRegionPointer(), SCREENWIDTH, saved_background, LOADING_DISK_W, LOADING_DISK_W, LOADING_DISK_H); disk_drawn = false; } }