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Diffstat (limited to 'giflib-4.1.6/util/gifbg.c')
| -rw-r--r-- | giflib-4.1.6/util/gifbg.c | 371 |
1 files changed, 371 insertions, 0 deletions
diff --git a/giflib-4.1.6/util/gifbg.c b/giflib-4.1.6/util/gifbg.c new file mode 100644 index 0000000..8dc98b8 --- /dev/null +++ b/giflib-4.1.6/util/gifbg.c @@ -0,0 +1,371 @@ +/***************************************************************************** +* "Gif-Lib" - Yet another gif library. * +* * +* Written by: Gershon Elber Ver 0.1, Jul. 1989 * +****************************************************************************** +* Program to generate back ground image that can be used to replace constant * +* background. * +* Options: * +* -q : quiet printing mode. * +* -d direction : set direction image should increase intensity. * +* -l levels : number of color levels. * +* -c r g b : colors of the back ground. * +* -m min : minimin intensity in percent. * +* -M max : maximum intensity in percent. * +* -s width height : size of image to create. * +* -h : on-line help. * +****************************************************************************** +* History: * +* 9 Jul 89 - Version 1.0 by Gershon Elber. * +*****************************************************************************/ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#ifdef __MSDOS__ +#include <stdlib.h> +#include <alloc.h> +#endif /* __MSDOS__ */ + +#ifndef __MSDOS__ +#include <stdlib.h> +#endif +#include <stdio.h> +#include <ctype.h> +#include <string.h> +#include "gif_lib.h" +#include "getarg.h" + +#define PROGRAM_NAME "GifBG" + +#define DEFAULT_WIDTH 640 +#define DEFAULT_HEIGHT 350 + +#define DEFAULT_COLOR_RED 0 +#define DEFAULT_COLOR_GREEN 0 +#define DEFAULT_COLOR_BLUE 255 + +#define DEFAULT_MIN_INTENSITY 10 /* In percent. */ +#define DEFAULT_MAX_INTENSITY 100 + +#define DEFAULT_NUM_LEVELS 16 /* Number of colors to gen the image. */ + +#define DIR_NONE 0 /* Direction the levels can be changed: */ +#define DIR_TOP 1 +#define DIR_TOP_RIGHT 2 +#define DIR_RIGHT 3 +#define DIR_BOT_RIGHT 4 +#define DIR_BOT 5 +#define DIR_BOT_LEFT 6 +#define DIR_LEFT 7 +#define DIR_TOP_LEFT 8 + +#define DEFAULT_DIR "T" /* TOP (North) direction. */ + +#ifdef __MSDOS__ +extern unsigned int + _stklen = 16384; /* Increase default stack size. */ +#endif /* __MSDOS__ */ + +#ifdef SYSV +static char *VersionStr = + "Gif library module \t\tGershon Elber\n\ + (C) Copyright 1989 Gershon Elber.\n"; +static char + *CtrlStr = "GifBG q%- d%-Dir!s l%-#Lvls!d c%-R|G|B!d!d!d m%-MinI!d M%-MaxI!d s%-W|H!d!d h%-"; +#else +static char + *VersionStr = + PROGRAM_NAME + GIF_LIB_VERSION + " Gershon Elber, " + __DATE__ ", " __TIME__ "\n" + "(C) Copyright 1989 Gershon Elber.\n"; +static char + *CtrlStr = + PROGRAM_NAME + " q%- d%-Dir!s l%-#Lvls!d c%-R|G|B!d!d!d m%-MinI!d M%-MaxI!d s%-W|H!d!d h%-"; +#endif /* SYSV */ + +static int + MaximumIntensity = DEFAULT_MAX_INTENSITY, /* In percent. */ + MinimumIntensity = DEFAULT_MIN_INTENSITY, + NumLevels = DEFAULT_NUM_LEVELS, + ImageWidth = DEFAULT_WIDTH, + ImageHeight = DEFAULT_HEIGHT, + Direction; +static unsigned int + RedColor = DEFAULT_COLOR_RED, + GreenColor = DEFAULT_COLOR_GREEN, + BlueColor = DEFAULT_COLOR_BLUE; + +static void QuitGifError(GifFileType *GifFile); + +/****************************************************************************** +* Interpret the command line and scan the given GIF file. * +******************************************************************************/ +int main(int argc, char **argv) +{ + unsigned int Ratio; + int i, j, l, LevelHeight, LevelWidth, Error, LogNumLevels, FlipDir, + Accumulator, StartX, StepX, Count = 0, DoAllMaximum = FALSE, + DirectionFlag = FALSE, LevelsFlag = FALSE, ColorFlag = FALSE, + MinFlag = FALSE, MaxFlag = FALSE, SizeFlag = FALSE, HelpFlag = FALSE; + GifPixelType Color; + char *DirectionStr = DEFAULT_DIR; + GifRowType Line; + ColorMapObject *ColorMap; + GifFileType *GifFile; + + if ((Error = GAGetArgs(argc, argv, CtrlStr, &GifQuietPrint, + &DirectionFlag, &DirectionStr, &LevelsFlag, &NumLevels, + &ColorFlag, &RedColor, &GreenColor, &BlueColor, + &MinFlag, &MinimumIntensity, &MaxFlag, &MaximumIntensity, + &SizeFlag, &ImageWidth, &ImageHeight, + &HelpFlag)) != FALSE) { + GAPrintErrMsg(Error); + GAPrintHowTo(CtrlStr); + exit(EXIT_FAILURE); + } + + if (HelpFlag) { + fprintf(stderr, VersionStr); + GAPrintHowTo(CtrlStr); + exit(EXIT_SUCCESS); + } + + /* Make sure intensities are in the right range: */ + if (MinimumIntensity < 0 || MinimumIntensity > 100 || + MaximumIntensity < 0 || MaximumIntensity > 100) + GIF_EXIT("Intensities (-m or -M options) are not in [0..100] range (percent)."); + + /* Convert DirectionStr to our local representation: */ + Direction = DIR_NONE; + FlipDir = FALSE; + for (i = 0; i < (int)strlen(DirectionStr); i++) /* Make sure its upper case. */ + if (islower(DirectionStr[i])) + DirectionStr[i] = toupper(DirectionStr[i]); + + switch(DirectionStr[0]) { + case 'T': /* Top or North */ + case 'N': + if (strlen(DirectionStr) < 2) + Direction = DIR_TOP; + else + switch(DirectionStr[1]) { + case 'R': + case 'E': + Direction = DIR_TOP_RIGHT; + break; + case 'L': + case 'W': + Direction = DIR_TOP_LEFT; + FlipDir = TRUE; + break; + } + break; + case 'R': /* Right or East */ + case 'E': + Direction = DIR_RIGHT; + break; + case 'B': /* Bottom or South */ + case 'S': + if (strlen(DirectionStr) < 2) { + Direction = DIR_BOT; + FlipDir = TRUE; + } + else + switch(DirectionStr[1]) { + case 'R': + case 'E': + Direction = DIR_BOT_RIGHT; + break; + case 'L': + case 'W': + Direction = DIR_BOT_LEFT; + FlipDir = TRUE; + break; + } + break; + case 'L': /* Left or West */ + case 'W': + Direction = DIR_LEFT; + FlipDir = TRUE; + break; + } + if (Direction == DIR_NONE) + GIF_EXIT("Direction requested (-d option) is wierd!"); + + /* We are going to handle only TOP, TOP_RIGHT, RIGHT, BOT_RIGHT so flip */ + /* the complement cases (TOP <-> BOT for example) by flipping the */ + /* Color i with color (NumLevels - i - 1). */ + if (FlipDir) { + switch (Direction) { + case DIR_BOT: + Direction = DIR_TOP; + break; + case DIR_BOT_LEFT: + Direction = DIR_TOP_RIGHT; + break; + case DIR_LEFT: + Direction = DIR_RIGHT; + break; + case DIR_TOP_LEFT: + Direction = DIR_BOT_RIGHT; + break; + } + } + + /* If binary mask is requested (special case): */ + if (MinimumIntensity == 100 && MaximumIntensity == 100 && NumLevels == 2) { + MinimumIntensity = 0; + DoAllMaximum = TRUE; + Direction = DIR_RIGHT; + } + + /* Make sure colors are in the right range: */ + if (RedColor > 255 || GreenColor > 255 || BlueColor > 255) + GIF_EXIT("Colors are not in the ragne [0..255]."); + + /* Make sure number of levels is power of 2 (up to 8 bits per pixel). */ + for (i = 1; i < 8; i++) if (NumLevels == (1 << i)) break; + if (i == 8) GIF_EXIT("#Lvls (-l option) is not power of 2."); + LogNumLevels = i; + + /* Open stdout for the output file: */ + if ((GifFile = EGifOpenFileHandle(1)) == NULL) + QuitGifError(GifFile); + + /* Dump out screen description with given size and generated color map: */ + if ((ColorMap = MakeMapObject(NumLevels, NULL)) == NULL) + GIF_EXIT("Failed to allocate memory required, aborted."); + + for (i = 1; i <= NumLevels; i++) { + /* Ratio will be in the range of 0..100 for required intensity: */ + Ratio = (MaximumIntensity * (i * (256 / NumLevels)) + + MinimumIntensity * ((NumLevels - i) * (256 / NumLevels))) / + 256; + ColorMap->Colors[i-1].Red = (RedColor * Ratio) / 100; + ColorMap->Colors[i-1].Green = (GreenColor * Ratio) / 100; + ColorMap->Colors[i-1].Blue = (BlueColor * Ratio) / 100; + } + if (EGifPutScreenDesc(GifFile, + ImageWidth, ImageHeight, LogNumLevels, 0, ColorMap) + == GIF_ERROR) + QuitGifError(GifFile); + + /* Dump out the image descriptor: */ + if (EGifPutImageDesc(GifFile, + 0, 0, ImageWidth, ImageHeight, FALSE, NULL) == GIF_ERROR) + QuitGifError(GifFile); + + GifQprintf("\n%s: Image 1 at (%d, %d) [%dx%d]: ", + PROGRAM_NAME, GifFile->Image.Left, GifFile->Image.Top, + GifFile->Image.Width, GifFile->Image.Height); + + /* Allocate one scan line twice as big as image is as we are going to */ + /* shift along it, while we dump the scan lines: */ + if ((Line = (GifRowType) malloc(sizeof(GifPixelType) * ImageWidth * 2)) == NULL) + GIF_EXIT("Failed to allocate memory required, aborted."); + + if (Direction == DIR_TOP) { + /* We must evaluate the line each time level is changing: */ + LevelHeight = ImageHeight / NumLevels; + for (Color = NumLevels, i = l = 0; i < ImageHeight; i++) { + if (i == l) { + /* Time to update the line to next color level: */ + if (Color != 0) Color--; + for (j = 0; j < ImageWidth; j++) + Line[j] = (FlipDir ? NumLevels - Color - 1 : Color); + l += LevelHeight; + } + if (EGifPutLine(GifFile, Line, ImageWidth) == GIF_ERROR) + QuitGifError(GifFile); + GifQprintf("\b\b\b\b%-4d", Count++); + } + } + else if (Direction == DIR_RIGHT) { + /* We pre-prepare the scan lines as going from color zero to maximum */ + /* color and dump the same scan line Height times: */ + /* Note this case should handle the Boolean Mask special case. */ + LevelWidth = ImageWidth / NumLevels; + if (DoAllMaximum) { + /* Special case - do all in maximum color: */ + for (i = 0; i < ImageWidth; i++) Line[i] = 1; + } + else { + for (Color = i = 0, l = LevelWidth; i < ImageWidth; i++, l--) { + if (l == 0) { + l = LevelWidth; + if (Color < NumLevels - 1) Color++; + } + Line[i] = (FlipDir ? NumLevels - Color - 1 : Color); + } + } + + for (i = 0; i < ImageHeight; i++) { + if (EGifPutLine(GifFile, Line, ImageWidth) == GIF_ERROR) + QuitGifError(GifFile); + GifQprintf("\b\b\b\b%-4d", Count++); + } + } + else { + /* We are in one of the TOP_RIGHT, BOT_RIGHT cases: we will */ + /* initialize the Line with its double ImageWidth length from the */ + /* minimum intensity to the maximum intensity and shift along it */ + /* while we go along the image height. */ + LevelWidth = ImageWidth * 2 / NumLevels; + for (Color = i = 0, l = LevelWidth; i < ImageWidth * 2; i++, l--) { + if (l == 0) { + l = LevelWidth; + if (Color < NumLevels - 1) Color++; + } + Line[i] = (FlipDir ? NumLevels - Color - 1 : Color); + } + /* We need to implement a DDA to know how much to shift Line while */ + /* we go down along image height. we set the parameters for it now: */ + Accumulator = 0; + switch(Direction) { + case DIR_TOP_RIGHT: + StartX = ImageWidth; + StepX = -1; + break; + case DIR_BOT_RIGHT: + default: + StartX = 0; + StepX = 1; + break; + } + + /* Time to dump information out: */ + for (i = 0; i < ImageHeight; i++) { + if (EGifPutLine(GifFile, &Line[StartX], ImageWidth) == GIF_ERROR) + QuitGifError(GifFile); + GifQprintf("\b\b\b\b%-4d", Count++); + if ((Accumulator += ImageWidth) > ImageHeight) { + while (Accumulator > ImageHeight) { + Accumulator -= ImageHeight; + StartX += StepX; + } + if (Direction < 0) Direction = 0; + if (Direction > ImageWidth) Direction = ImageWidth; + } + } + } + + if (EGifCloseFile(GifFile) == GIF_ERROR) + QuitGifError(GifFile); + + return 0; +} + +/****************************************************************************** +* Close output file (if open), and exit. * +******************************************************************************/ +static void QuitGifError(GifFileType *GifFile) +{ + PrintGifError(); + if (GifFile != NULL) EGifCloseFile(GifFile); + exit(EXIT_FAILURE); +} |