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- /*****************************************************************************
- * "Gif-Lib" - Yet another gif library. *
- * *
- * Written by: Gershon Elber Ver 0.1, Jul. 1989 *
- ******************************************************************************
- * Program to display GIF file using the BGI device indepedent routines *
- * Options: *
- * -q : quite printing mode. *
- * -d BGI path : specify the directory where to look for bgi drivers. *
- * -u BGIUserDriverName.Mode : use user driver instead of auto detection. *
- * -z factor : zoom the pixels by the given factor. *
- * -b : beeps disabled. *
- * -h : on line help. *
- * *
- * In this file Screen refers to GIF file screen, while Device to BGI size. *
- ******************************************************************************
- * History: *
- * 31 Jul 90 - Version 1.0 by Gershon Elber. *
- *****************************************************************************/
-
- #include <graphics.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <conio.h>
- #include <ctype.h>
- #include <alloc.h>
- #include <string.h>
- #include <io.h>
- #include <dos.h>
- #include <bios.h>
- #include <fcntl.h>
- #include "gif_lib.h"
- #include "getarg.h"
-
- #define PROGRAM_NAME "Gif2BGI"
-
- #define KEY_LEFT 256 /* Key Codes returned for operational keys */
- #define KEY_RIGHT 257 /* as return by the GetKey routine. */
- #define KEY_UP 258
- #define KEY_DOWN 259
- #define KEY_RETURN 260
- #define KEY_DELETE 261
- #define KEY_INSERT 262
- #define KEY_BSPACE 263
- #define KEY_ESC 264
- #define KEY_HOME 265
- #define KEY_END 266
- #define KEY_PGUP 267
- #define KEY_PGDN 268
-
- #define SET_POSITION_RESET 0 /* Situations need positionings: */
- #define SET_POSITION_ZOOM_U 1
- #define SET_POSITION_ZOOM_D 2
- #define SET_POSITION_PAN 3
-
- #define CURSOR_TEXT_X 120
-
- #define BGI_USER_INSTALL 999 /* BGI User installed driver device. */
-
- #define MIN(x, y) ((x) < (y) ? (x) : (y))
-
- extern unsigned int
- _stklen = 16384; /* Increase default stack size. */
-
- static char
- *VersionStr =
- PROGRAM_NAME
- GIF_LIB_VERSION
- " Gershon Elber, "
- __DATE__ ", " __TIME__ "\n"
- "(C) Copyright 1989 Gershon Elber, Non commercial use only.\n";
- static char
- *CtrlStr =
- PROGRAM_NAME
- " q%- d%-BGI|Directory!s u%-UserBGIDrv.Mode!s z%-ZoomFactor!d b%- h%- GifFile!*s";
- static char
- *GifFileName,
- *BGIPath = "",
- *BGIUserDriverName = NULL;
-
- /* Make some variables global, so we could access them faster: */
- static int
- ImageNum = 0,
- BackGround = 0,
- ForeGround = 1, /* As close to white as possible. */
- BeepsDisabled = FALSE,
- ZoomFactor = 1,
- MaximumScreenHeight = 1,
- BGIUserDriverMode = -1,
- DeviceMaxX = 640, DeviceMaxY = 400, /* Physical device dimensions. */
- ScreenWidth = 320, ScreenHeight = 200, /* Gif image screen size. */
- InterlacedOffset[] = { 0, 4, 2, 1 }, /* The way Interlaced image should. */
- InterlacedJumps[] = { 8, 8, 4, 2 }; /* be read - offsets and jumps... */
- static GifColorType
- *ColorMap;
-
- static int huge detectVGA(void);
- static void BGIInstallUserDriver(char *BGIUserDriverNameMode);
- static void DisplayScreen(GifRowType *ScreenBuffer, GifFileType *GifFile);
- static void PrintSettingStatus(GifFileType *GifFile);
- static void CPrintStr(char *Str, int y);
- static void SetPosition(int Why,
- int *ScreenLeft, int *ScreenTop,
- int *DeviceLeft, int *DeviceTop,
- int MoveX, int MoveY);
- static void DrawScreen(GifRowType *ScreenBuffer,
- int ScreenLeft, int ScreenTop, int DeviceLeft, int DeviceTop);
- static void DoCursorMode(GifRowType *ScreenBuffer,
- int ScreenLeft, int ScreenTop, int DeviceLeft, int DeviceTop);
- static int MyKbHit(void);
- static int MyGetCh(void);
- static int GetKey(void);
- static void Tone(int Frequency, int Time);
-
- /******************************************************************************
- * Interpret the command line and scan the given GIF file. *
- ******************************************************************************/
- void main(int argc, char **argv)
- {
- int i, j, k, Error, NumFiles, Size, Row, Col, Width, Height, ExtCode,
- Count, ColorMapSize, GraphDriver, GraphMode, Sum,
- HelpFlag = FALSE,
- BGIPathFlag = FALSE,
- BGIUserDriverFlag = FALSE,
- ZoomFlag = FALSE;
- GifRecordType RecordType;
- GifByteType *Extension;
- char Str[80], *BGIUserDriverNameMode,
- **FileName = NULL;
- GifRowType *ScreenBuffer;
- GifFileType *GifFile;
- struct text_info TextInfo; /* So we can restore starting text mode. */
-
- if ((Error = GAGetArgs(argc, argv, CtrlStr,
- &GifQuitePrint, &BGIPathFlag, &BGIPath,
- &BGIUserDriverFlag, &BGIUserDriverNameMode,
- &ZoomFlag, &ZoomFactor,
- &BeepsDisabled, &HelpFlag,
- &NumFiles, &FileName)) != FALSE ||
- (NumFiles > 1 && !HelpFlag)) {
- if (Error)
- GAPrintErrMsg(Error);
- else if (NumFiles > 1)
- GIF_MESSAGE("Error in command line parsing - one GIF file please.");
- GAPrintHowTo(CtrlStr);
- exit(1);
- }
-
- if (HelpFlag) {
- fprintf(stderr, VersionStr);
- GAPrintHowTo(CtrlStr);
- exit(0);
- }
-
- if (BGIUserDriverFlag) {
- /* Use the driver supplied by the user! */
- BGIInstallUserDriver(BGIUserDriverNameMode);
- installuserdriver(BGIUserDriverName, detectVGA);
- GraphDriver = BGI_USER_INSTALL;
- }
- else {
- /* Sense type of display we have and attempt to load right driver. */
- detectgraph(&GraphDriver, &GraphMode);
- if (GraphDriver < 0)
- GIF_EXIT("BGI Auto detect: No graphics device detected.");
- }
-
- /* Put in the following any graphic driver specific setup: */
- switch (GraphDriver) {
- case CGA:
- GraphMode = CGAHI;
- break;
- case EGA:
- GraphMode = EGAHI;
- break;
- case EGA64:
- GraphMode = EGA64HI;
- break;
- case EGAMONO:
- GraphMode = EGAMONOHI;
- break;
- case HERCMONO:
- GraphMode = HERCMONOHI;
- break;
- case VGA:
- GraphMode = VGAHI;
- break;
- case BGI_USER_INSTALL:
- GraphDriver = DETECT;
- GraphMode = BGIUserDriverMode;
- break;
- default:
- GIF_EXIT("Requested graphic device is not supported.");
- break;
- }
-
- if (NumFiles == 1) {
- GifFileName = *FileName;
- if ((GifFile = DGifOpenFileName(*FileName)) == NULL) {
- PrintGifError();
- exit(-1);
- }
- }
- else {
- /* Use the stdin instead: */
- GifFileName = "Stdin";
- setmode(0, O_BINARY);
- if ((GifFile = DGifOpenFileHandle(0)) == NULL) {
- PrintGifError();
- exit(-1);
- }
- }
-
- /* Allocate the screen as vector of column of rows. We cannt allocate */
- /* the all screen at once, as this broken minded CPU can allocate up to */
- /* 64k at a time and our image can be bigger than that: */
- /* Note this screen is device independent - its the screen as defined by */
- /* the GIF file parameters itself. */
- if ((ScreenBuffer = (GifRowType *)
- malloc(GifFile -> SHeight * sizeof(GifRowType *))) == NULL)
- GIF_EXIT("Failed to allocate memory required, aborted.");
-
- Size = GifFile -> SWidth * sizeof(GifPixelType);/* Size in bytes of one row.*/
- if ((ScreenBuffer[0] = (GifRowType) malloc(Size)) == NULL) /* First row. */
- GIF_EXIT("Failed to allocate memory required, aborted.");
-
- for (i = 0; i < GifFile -> SWidth; i++) /* Set its color to BackGround. */
- ScreenBuffer[0][i] = GifFile -> SBackGroundColor;
- MaximumScreenHeight = GifFile -> SHeight - 1;
- for (i = 1; i < GifFile -> SHeight; i++) {
- /* Allocate the other rows, and set their color to background too: */
- if ((ScreenBuffer[i] = (GifRowType) malloc(Size)) == NULL) {
- if (i > 30) {
- /* Free some memory for the BGI driver and auxilary. */
- for (j = 1; j < 28; j++)
- free((char *) ScreenBuffer[i - j]);
- MaximumScreenHeight = i - 28;
- fprintf(stderr, "\n%s: Failed to allocate all memory required, last line %d.\n",
- PROGRAM_NAME, MaximumScreenHeight);
- break;
- }
- else
- GIF_EXIT("Failed to allocate memory required, aborted.");
- }
-
- memcpy(ScreenBuffer[i], ScreenBuffer[0], Size);
- }
-
- /* Scan the content of the GIF file and load the image(s) in: */
- do {
- if (DGifGetRecordType(GifFile, &RecordType) == GIF_ERROR) {
- PrintGifError();
- break;
- }
- switch (RecordType) {
- case IMAGE_DESC_RECORD_TYPE:
- if (DGifGetImageDesc(GifFile) == GIF_ERROR) {
- PrintGifError();
- exit(-1);
- }
-
- Row = GifFile -> ITop; /* Image Position relative to Screen. */
- Col = GifFile -> ILeft;
- Width = GifFile -> IWidth;
- Height = GifFile -> IHeight;
- GifQprintf("\n%s: Image %d at (%d, %d) [%dx%d]: ",
- PROGRAM_NAME, ++ImageNum, Col, Row, Width, Height);
- if (GifFile -> ILeft + GifFile -> IWidth > GifFile -> SWidth ||
- GifFile -> ITop + GifFile -> IHeight > GifFile -> SHeight) {
- fprintf(stderr, "Image %d is not confined to screen dimension, aborted.\n");
- exit(-2);
- }
- if (GifFile -> IInterlace) {
- /* Need to perform 4 passes on the images: */
- for (Count = i = 0; i < 4; i++)
- for (j = Row + InterlacedOffset[i]; j < Row + Height;
- j += InterlacedJumps[i]) {
- GifQprintf("\b\b\b\b%-4d", Count++);
- if (DGifGetLine(GifFile,
- &ScreenBuffer[MIN(j, MaximumScreenHeight)][Col],
- Width) == GIF_ERROR) {
- PrintGifError();
- exit(-1);
- }
- }
- }
- else {
- for (i = 0; i < Height; i++, Row++) {
- GifQprintf("\b\b\b\b%-4d", i);
- if (DGifGetLine(GifFile, &ScreenBuffer[MIN(Row, MaximumScreenHeight)][Col],
- Width) == GIF_ERROR) {
- PrintGifError();
- MaximumScreenHeight = MIN(i - 1, MaximumScreenHeight);
- }
- }
- }
- break;
- case EXTENSION_RECORD_TYPE:
- /* Skip any extension blocks in file: */
- if (DGifGetExtension(GifFile, &ExtCode, &Extension) == GIF_ERROR) {
- PrintGifError();
- exit(-1);
- }
- while (Extension != NULL) {
- if (DGifGetExtensionNext(GifFile, &Extension) == GIF_ERROR) {
- PrintGifError();
- exit(-1);
- }
- }
- break;
- case TERMINATE_RECORD_TYPE:
- break;
- default: /* Should be traps by DGifGetRecordType. */
- break;
- }
- }
- while (RecordType != TERMINATE_RECORD_TYPE);
-
- /* Lets display it - set the global variables required and do it: */
- BackGround = GifFile -> SBackGroundColor;
- ColorMap = (GifFile -> IColorMap ? GifFile -> IColorMap :
- GifFile -> SColorMap);
- ColorMapSize = 1 << (GifFile -> IColorMap ? GifFile -> IBitsPerPixel :
- GifFile -> SBitsPerPixel);
-
- gettextinfo(&TextInfo); /* Save current mode so we can recover. */
-
- initgraph(&GraphDriver, &GraphMode, BGIPath);
- if (graphresult() != grOk) /* Error occured during init. */
- GIF_EXIT("Graphics System Error, failed to initialize driver.");
-
- if (getmaxcolor() + 1 < ColorMapSize) {
- sprintf(Str, "GIF Image color map (%d) is too big for device (%d).\n",
- ColorMapSize, getmaxcolor() + 1);
- closegraph();
- GIF_EXIT(Str);
- }
-
- /* Initialize hardware pallete and also select fore/background color. */
- BackGround = ForeGround = 1;
- Sum = ((int) ColorMap[1].Red) +
- ((int) ColorMap[1].Green) +
- ((int) ColorMap[1].Blue);
- j = k = Sum;
- for (i = 0; i < ColorMapSize; i++) {
- setrgbpalette(i, ColorMap[i].Red >> 2,
- ColorMap[i].Green >> 2,
- ColorMap[i].Blue >> 2);
-
- Sum = ((int) ColorMap[i].Red) +
- ((int) ColorMap[i].Green) +
- ((int) ColorMap[i].Blue);
- if (i != 0 && Sum > j) { /* Dont use color 0. */
- ForeGround = i;
- j = Sum;
- }
- if (i != 0 && Sum <= k) { /* Dont use color 0. */
- BackGround = i;
- k = Sum;
- }
- }
-
- DeviceMaxX = getmaxx(); /* Read size of physical screen. */
- DeviceMaxY = getmaxy();
- ScreenWidth = GifFile -> SWidth;
- ScreenHeight = MIN(GifFile -> SHeight, MaximumScreenHeight);
-
- Tone(500, 10);
- DisplayScreen(ScreenBuffer, GifFile);
-
- if (DGifCloseFile(GifFile) == GIF_ERROR) {
- PrintGifError();
- closegraph();
- exit(-1);
- }
-
- closegraph();
-
- textmode(TextInfo.currmode);
- }
-
- /****************************************************************************
- * Routine to be called for the user installed driver: *
- ****************************************************************************/
- static int huge detectVGA(void)
- {
- return BGIUserDriverMode;
- }
-
- /****************************************************************************
- * Routine to install the user BGI driver information. *
- ****************************************************************************/
- static void BGIInstallUserDriver(char *BGIUserDriverNameMode)
- {
- char *p;
-
- if ((p = strrchr(BGIUserDriverNameMode, '/')) != NULL ||
- (p = strrchr(BGIUserDriverNameMode, '\\')) != NULL) {
- p[0] = 0;
- BGIPath = strdup(BGIUserDriverNameMode);
- p++;
- }
-
- p = strtok(p, ".");
- BGIUserDriverName = strdup(p);
-
- p = strtok(NULL, ".");
- if (sscanf(p, "%d", &BGIUserDriverMode) != 1 || BGIUserDriverName == NULL)
- GIF_EXIT("User [-u] BGI specification has wrong format.");
- }
-
- /******************************************************************************
- * Given the screen buffer, display it: *
- * The following commands are available (case insensitive). *
- * 1. Four arrow to move along the screen (only if ScreenBuffer > physical *
- * screen in that direction. *
- * 2. C - goto cursor mode - print current color & position in GIF screen *
- * of the current pixel cursor is on. *
- * 3. D - zoom out by factor of 2. *
- * 4. R - redraw current image. *
- * 5. S - Print Current status/options. *
- * 6. U - zoom in by factor of 2. *
- * 7. ' ' - stop drawing current image. *
- * 8. ESC - to quit. *
- ******************************************************************************/
- static void DisplayScreen(GifRowType *ScreenBuffer, GifFileType *GifFile)
- {
- int DeviceTop, DeviceLeft, /* Where ScreenBuffer is to mapped to ours. */
- ScreenTop, ScreenLeft, /* Porsion of ScreenBuffer to start display. */
- XPanning, YPanning, /* Amount to move using the arrows. */
- GetK, DrawIt = TRUE;
-
- XPanning = DeviceMaxX / 2;
- YPanning = DeviceMaxY / 2;
-
- SetPosition(SET_POSITION_RESET,
- &ScreenLeft, &ScreenTop,
- &DeviceLeft, &DeviceTop,
- 0, 0);
-
- do {
- if (DrawIt && !MyKbHit()) {
- DrawScreen(ScreenBuffer, ScreenLeft, ScreenTop,
- DeviceLeft, DeviceTop);
- Tone(2000, 200);
- }
- DrawIt = TRUE;
- switch (GetK = GetKey()) {
- case 'C':
- DoCursorMode(ScreenBuffer, ScreenLeft, ScreenTop,
- DeviceLeft, DeviceTop);
- DrawIt = TRUE;
- break;
- case 'D':
- if (ZoomFactor > 1) {
- ZoomFactor >>= 1;
- SetPosition(SET_POSITION_ZOOM_D,
- &ScreenLeft, &ScreenTop,
- &DeviceLeft, &DeviceTop,
- 0, 0);
- }
- else {
- Tone(1000, 100);
- DrawIt = FALSE;
- }
- break;
- case 'R':
- break;
- case 'S':
- PrintSettingStatus(GifFile);
- break;
- case 'U':
- if (ZoomFactor < 256) {
- ZoomFactor <<= 1;
- SetPosition(SET_POSITION_ZOOM_U,
- &ScreenLeft, &ScreenTop,
- &DeviceLeft, &DeviceTop,
- 0, 0);
- }
- else {
- Tone(1000, 100);
- DrawIt = FALSE;
- }
- break;
- case KEY_ESC:
- break;
- case KEY_LEFT:
- SetPosition(SET_POSITION_PAN,
- &ScreenLeft, &ScreenTop,
- &DeviceLeft, &DeviceTop,
- -XPanning, 0);
- break;
- case KEY_RIGHT:
- SetPosition(SET_POSITION_PAN,
- &ScreenLeft, &ScreenTop,
- &DeviceLeft, &DeviceTop,
- XPanning, 0);
- break;
- case KEY_UP:
- SetPosition(SET_POSITION_PAN,
- &ScreenLeft, &ScreenTop,
- &DeviceLeft, &DeviceTop,
- 0, -YPanning);
- break;
- case KEY_DOWN:
- SetPosition(SET_POSITION_PAN,
- &ScreenLeft, &ScreenTop,
- &DeviceLeft, &DeviceTop,
- 0, YPanning);
- break;
- default:
- DrawIt = FALSE;
- Tone(800, 100);
- Tone(300, 200);
- break;
- }
- }
- while (GetK != KEY_ESC);
- }
-
- /******************************************************************************
- * Routine to print (in text mode), current program status. *
- ******************************************************************************/
- static void PrintSettingStatus(GifFileType *GifFile)
- {
- char s[80];
-
- setcolor(ForeGround);
-
- CPrintStr(PROGRAM_NAME, 1);
-
- sprintf(s, "GIF File - %s.", GifFileName);
- CPrintStr(s, 10);
-
- sprintf(s, "Gif Screen Size = [%d, %d]. Contains %d image(s).",
- GifFile -> SWidth, GifFile -> SHeight, ImageNum);
- CPrintStr(s, 20);
-
- if (GifFile -> SColorMap)
- sprintf(s,
- "Has Screen Color map of %d bits. BackGround = [%d, %d, %d].",
- GifFile -> SBitsPerPixel,
- GifFile -> SColorMap[GifFile -> SBackGroundColor].Red,
- GifFile -> SColorMap[GifFile -> SBackGroundColor].Green,
- GifFile -> SColorMap[GifFile -> SBackGroundColor].Blue);
- else
- sprintf(s, "No Screen color map.");
- CPrintStr(s, 30);
-
- if (GifFile -> IColorMap)
- sprintf(s, "Has Image map of %d bits (last image). Image is %s.",
- GifFile -> IBitsPerPixel,
- (GifFile -> IInterlace ? "interlaced" : "non interlaced"));
- else
- sprintf(s, "No Image color map.");
- CPrintStr(s, 40);
-
- CPrintStr("Press anything to continue:", 60);
- MyGetCh();
- }
-
- /******************************************************************************
- * Routine to cprintf given string centered at given Y level, and attr: *
- ******************************************************************************/
- static void CPrintStr(char *Str, int y)
- {
- setfillstyle(SOLID_FILL, BackGround);
- bar(0, y, textwidth(Str) + 2, y + textheight(Str) + 2);
-
- setcolor(ForeGround);
- outtextxy(1, y + 1, Str);
- }
-
- /******************************************************************************
- * Routine to set the position of Screen in Device, and what porsion of the *
- * screen should be visible: *
- * MoveX, MoveY are the panning factors (if both zero - initialize). *
- ******************************************************************************/
- static void SetPosition(int Why,
- int *ScreenLeft, int *ScreenTop,
- int *DeviceLeft, int *DeviceTop,
- int MoveX, int MoveY)
- {
-
- MoveX /= ZoomFactor; /* Make sure move move same amount independent. */
- MoveY /= ZoomFactor; /* of what ZommFactor is. */
-
- /* Figure out position of GIF file in real device X axis: */
- if (ScreenWidth * ZoomFactor <= DeviceMaxX + 1) {
- /* Device is big enough to hold all the image X axis: */
- *ScreenLeft = 0;
- *DeviceLeft = (DeviceMaxX - ScreenWidth * ZoomFactor) / 2;
- }
- else {
- /* Device is too small to hold all the image X axis: */
- switch (Why) {
- case SET_POSITION_RESET:
- *ScreenLeft = 0;
- break;
- case SET_POSITION_ZOOM_U:
- *ScreenLeft += DeviceMaxX / (2 * ZoomFactor);
- break;
- case SET_POSITION_ZOOM_D:
- *ScreenLeft -= DeviceMaxX / (4 * ZoomFactor);
- break;
- case SET_POSITION_PAN:
- if (MoveX != 0) *ScreenLeft += MoveX;
- break;
- }
- if (*ScreenLeft < 0) *ScreenLeft = 0;
- if ((ScreenWidth - *ScreenLeft) * ZoomFactor < DeviceMaxX + 1)
- *ScreenLeft = (ScreenWidth * ZoomFactor -
- DeviceMaxX + 1) / ZoomFactor;
- *DeviceLeft = 0;
- }
-
- /* Figure out position of GIF file in real device Y axis: */
- if (ScreenHeight * ZoomFactor <= DeviceMaxY + 1) {
- /* Device is big enough to hold all the image Y axis: */
- *ScreenTop = 0;
- *DeviceTop = (DeviceMaxY - ScreenHeight * ZoomFactor) / 2;
- }
- else {
- /* Device is too small to hold all the image Y axis: */
- switch (Why) {
- case SET_POSITION_RESET:
- *ScreenTop = 0;
- break;
- case SET_POSITION_ZOOM_U:
- *ScreenTop += DeviceMaxY / (2 * ZoomFactor);
- break;
- case SET_POSITION_ZOOM_D:
- *ScreenTop -= DeviceMaxY / (4 * ZoomFactor);
- break;
- case SET_POSITION_PAN:
- if (MoveY != 0) *ScreenTop += MoveY;
- break;
- }
- if (*ScreenTop < 0) *ScreenTop = 0;
- if ((ScreenHeight - *ScreenTop) * ZoomFactor < DeviceMaxY + 1)
- *ScreenTop = (ScreenHeight * ZoomFactor -
- DeviceMaxY - 1) / ZoomFactor;
- *DeviceTop = 0;
- }
-
- /* Make sure the position is on Byte boundary (8 pixels per byte): */
- *DeviceLeft &= 0xfff8;
- }
-
- /******************************************************************************
- * The real drawing of the image is performed here. Few things are taken into *
- * account: *
- * 1. The zoom factor. If > 1 each pixel is multiplied this amount vertically *
- * and horizontally. *
- * The image is drawn from ScreenBuffer ScreenTop/Left in the bottom/right *
- * directions, onto the Device DeviceTop/Left in the bottom/right direction *
- * Pressing space during drawing will abort this routine. *
- ******************************************************************************/
- static void DrawScreen(GifRowType *ScreenBuffer,
- int ScreenLeft, int ScreenTop, int DeviceLeft, int DeviceTop)
- {
- int i, j, k, l, CountZoomJ, CountZoomI,
- DeviceWidth, DeviceRight, ScreenBottom;
- unsigned char *ImageBuffer, *p;
- GifPixelType *Line;
-
- /* Make sure we start from scratch. Note cleardevice() uses color 0 even */
- /* if it may be non black. */
- cleardevice();
-
- if (getmaxcolor() + 1 == 256) {
- /* Optimize this case - one byte per pixel. */
- DeviceWidth = ScreenWidth * ZoomFactor;
- if (DeviceWidth + DeviceLeft > DeviceMaxX)
- DeviceWidth = DeviceMaxX - DeviceLeft;
- DeviceRight = DeviceLeft + DeviceWidth - 1;
- ScreenBottom = ScreenTop + ScreenHeight - 1;
-
- if ((ImageBuffer = malloc(imagesize(DeviceLeft, DeviceTop,
- DeviceRight, DeviceTop))) == NULL)
- GIF_EXIT("Failed to allocate memory required, aborted.");
- getimage(DeviceLeft, DeviceTop, DeviceRight, DeviceTop, ImageBuffer);
-
- for (k = DeviceTop; k < DeviceMaxY && ScreenTop <= ScreenBottom;) {
- Line = ScreenBuffer[ScreenTop++];
- p = ImageBuffer + 4; /* point on first pixel in bitmap. */
- if (ZoomFactor == 1)
- memcpy(p, &Line[ScreenLeft], DeviceWidth);
- else {
- for (i = 0, j = ScreenLeft, CountZoomI = ZoomFactor;
- i < DeviceWidth;
- i++) {
- *p++ = Line[j];
- if (--CountZoomI == 0) {
- CountZoomI = ZoomFactor;
- j++;
- }
- }
- }
-
- /* Abort drawing if space bar was pressed: */
- if (MyKbHit() && GetKey() == ' ') break;
-
- for (i = 0; i < ZoomFactor; i++)
- putimage(DeviceLeft, k++, ImageBuffer, COPY_PUT);
- }
-
- free((char *) ImageBuffer);
- }
- else {
- for (CountZoomJ = ZoomFactor, j = ScreenTop, l = DeviceTop;
- j < ScreenHeight && l <= DeviceMaxY; l++) {
- Line = ScreenBuffer[j];
-
- /* Abort drawing if space bar was pressed: */
- if (MyKbHit() && GetKey() == ' ') break;
-
- for (CountZoomI = ZoomFactor, i = ScreenLeft, k = DeviceLeft;
- i < ScreenWidth && k <= DeviceMaxX;) {
- putpixel(k++, l, Line[i]);
-
- if (!--CountZoomI) {
- /* Go to next column: */
- i++;
- CountZoomI = ZoomFactor;
- }
- }
-
- if (!--CountZoomJ) {
- /* Go to next row: */
- j++;
- CountZoomJ = ZoomFactor;
- }
- }
- }
- }
-
- /******************************************************************************
- * Walks along the current image, while printing pixel value and position. *
- * 4 arrows may be used, and any other key will abort this operation *
- ******************************************************************************/
- static void DoCursorMode(GifRowType *ScreenBuffer,
- int ScreenLeft, int ScreenTop, int DeviceLeft, int DeviceTop)
- {
- int GetK, DeviceRight, DeviceBottom, x, y, Step;
- GifPixelType Pixel;
- char s[80];
-
- DeviceRight = DeviceLeft + (ScreenWidth - ScreenLeft) * ZoomFactor;
- if (DeviceRight > DeviceMaxX) DeviceRight = DeviceMaxX;
-
- DeviceBottom = DeviceTop + (ScreenHeight - ScreenTop) * ZoomFactor;
- if (DeviceBottom > DeviceMaxY) DeviceBottom = DeviceMaxY;
-
- x = (DeviceLeft + DeviceRight) / 2;
- y = (DeviceTop + DeviceBottom) / 2;
-
- setwritemode(XOR_PUT);
-
- while (TRUE) {
- Pixel = ScreenBuffer[ScreenTop + (y - DeviceTop) / ZoomFactor]
- [ScreenLeft + (x - DeviceLeft) / ZoomFactor];
- sprintf(s, "Color = %3d [%3d, %3d, %3d], X = %3d, Y = %3d",
- Pixel,
- ColorMap[Pixel].Red,
- ColorMap[Pixel].Green,
- ColorMap[Pixel].Blue,
- (x - DeviceLeft) / ZoomFactor,
- (y - DeviceTop) / ZoomFactor);
-
- setfillstyle(SOLID_FILL, BackGround);
- bar(0, 0, textwidth(s) + 2, textheight(s) + 2);
-
- setcolor(ForeGround);
- outtextxy(1, 1, s);
-
- line(0, y, DeviceMaxX, y);
- line(x, 0, x, DeviceMaxY);
- GetK = GetKey();
- line(0, y, DeviceMaxX, y);
- line(x, 0, x, DeviceMaxY);
-
- Step = 10;
- switch (GetK) {
- case '1':
- GetK = KEY_END;
- break;
- case '2':
- GetK = KEY_DOWN;
- break;
- case '3':
- GetK = KEY_PGDN;
- break;
- case '4':
- GetK = KEY_LEFT;
- break;
- case '6':
- GetK = KEY_RIGHT;
- break;
- case '7':
- GetK = KEY_HOME;
- break;
- case '8':
- GetK = KEY_UP;
- break;
- case '9':
- GetK = KEY_PGUP;
- break;
- default:
- Step = 1;
- }
-
- switch (GetK) {
- case KEY_LEFT:
- x -= Step;
- break;
- case KEY_RIGHT:
- x += Step;
- break;
- case KEY_UP:
- y -= Step;
- break;
- case KEY_DOWN:
- y += Step;
- break;
- case KEY_PGUP:
- y -= Step;
- x += Step;
- break;
- case KEY_PGDN:
- y += Step;
- x += Step;
- break;
- case KEY_HOME:
- y -= Step;
- x -= Step;
- break;
- case KEY_END:
- y += Step;
- x -= Step;
- break;
- default:
- setwritemode(COPY_PUT);
- return;
- }
- if (x < DeviceLeft) x = DeviceLeft;
- if (x >= DeviceRight) x = DeviceRight;
- if (y < DeviceTop) y = DeviceTop;
- if (y >= DeviceBottom) y = DeviceBottom;
- }
- }
-
- /******************************************************************************
- * Return non zero value if at list one character exists in keyboard queue. *
- * This routine emulates kbhit() which do uses stdin and useless for us. *
- ******************************************************************************/
- static int MyKbHit(void)
- {
- return bioskey(1);
- }
-
- /******************************************************************************
- * Get a key from keyboard directly (bypass stdin as we might redirect it). *
- * This routine emulates getch() which do uses stdin and useless for us. *
- ******************************************************************************/
- static int MyGetCh(void)
- {
- static int Extended = 0;
- int c;
-
- if (Extended) {
- c = Extended;
- Extended = 0;
- return c;
- }
- else {
- c = bioskey(0);
- if (c & 0x0ff)
- return c;
- else {
- Extended = c >> 8;
- return 0;
- }
- }
- }
-
- /******************************************************************************
- * Get a key from keyboard, and translating operational keys into special *
- * codes (>255). Lower case characters are upercased. *
- ******************************************************************************/
- static int GetKey(void)
- {
- char c;
-
- while (TRUE) switch (c = MyGetCh()) {
- case 0: /* Extended code - get the next extended char. */
- switch (MyGetCh()) {
- case 75: return KEY_LEFT;
- case 77: return KEY_RIGHT;
- case 72: return KEY_UP;
- case 80: return KEY_DOWN;
- case 71: return KEY_HOME;
- case 79: return KEY_END;
- case 73: return KEY_PGUP;
- case 81: return KEY_PGDN;
- case 83: return KEY_DELETE;
- case 82: return KEY_INSERT;
- }
- break;
- case 8:
- return KEY_BSPACE;
- case 10:
- case 13:
- return KEY_RETURN;
- case 27:
- return KEY_ESC;
- default:
- if (isprint(c)) {
- if (islower(c))
- return toupper(c);
- else
- return c;
- }
- else {
- Tone(800, 100);
- Tone(300, 200);
- }
- }
- }
-
- /******************************************************************************
- * Routine to make some sound with given Frequency, Time milliseconds: *
- ******************************************************************************/
- static void Tone(int Frequency, int Time)
- {
- if (BeepsDisabled) return;
-
- sound(Frequency);
- delay(Time);
- nosound();
- }
-