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authornijtmans <nijtmans@noemail.net>2008-04-09 20:52:15 (GMT)
committernijtmans <nijtmans@noemail.net>2008-04-09 20:52:15 (GMT)
commit4a600289b11d25d3a56dcc019a07facdaa765025 (patch)
tree09af8685044d5c74a8cee2cd4de0c91efe2d8efc /generic/tkImgGIF.c
parentc1d02580df38e0a999679f08f42b9b03aa35a1b3 (diff)
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a little cleanup, in preparation for replacing the gif compressor with a real LZW one.
FossilOrigin-Name: 45100f26e2592eb37690c7f12122ca7945184a00
Diffstat (limited to 'generic/tkImgGIF.c')
-rw-r--r--generic/tkImgGIF.c177
1 files changed, 85 insertions, 92 deletions
diff --git a/generic/tkImgGIF.c b/generic/tkImgGIF.c
index b31c64d..b2b337c 100644
--- a/generic/tkImgGIF.c
+++ b/generic/tkImgGIF.c
@@ -32,7 +32,7 @@
* This file also contains code from miGIF. See lower down in file for the
* applicable copyright notice for that portion.
*
- * RCS: @(#) $Id: tkImgGIF.c,v 1.41 2008/02/01 16:53:53 rmax Exp $
+ * RCS: @(#) $Id: tkImgGIF.c,v 1.42 2008/04/09 20:52:16 nijtmans Exp $
*/
#include "tkInt.h"
@@ -1436,8 +1436,6 @@ Fread(
* Types, defines and variables needed to write and compress a GIF.
*/
-typedef int (* ifunptr) (ClientData clientData);
-
#define LSB(a) ((unsigned char) (((short)(a)) & 0x00FF))
#define MSB(a) ((unsigned char) (((short)(a)) >> 8))
@@ -1458,22 +1456,21 @@ typedef struct {
unsigned char mapa[MAXCOLORMAPSIZE][3];
} GifWriterState;
+typedef int (* ifunptr) (GifWriterState *statePtr);
+
/*
* Definition of new functions to write GIFs
*/
static int color(GifWriterState *statePtr,
- int red, int green, int blue,
- unsigned char mapa[MAXCOLORMAPSIZE][3]);
+ int red, int green, int blue);
static void compress(int initBits, Tcl_Channel handle,
- ifunptr readValue, ClientData clientData);
+ ifunptr readValue, GifWriterState *statePtr);
static int nuevo(GifWriterState *statePtr,
- int red, int green, int blue,
- unsigned char mapa[MAXCOLORMAPSIZE][3]);
+ int red, int green, int blue);
static void savemap(GifWriterState *statePtr,
- Tk_PhotoImageBlock *blockPtr,
- unsigned char mapa[MAXCOLORMAPSIZE][3]);
-static int ReadValue(ClientData clientData);
+ Tk_PhotoImageBlock *blockPtr);
+static int ReadValue(GifWriterState *statePtr);
static int
FileWriteGIF(
@@ -1510,7 +1507,7 @@ CommonWriteGIF(
Tcl_Obj *format,
Tk_PhotoImageBlock *blockPtr)
{
- GifWriterState state, *statePtr = &state;
+ GifWriterState state;
int resolution;
long width, height, x;
unsigned char c;
@@ -1519,40 +1516,40 @@ CommonWriteGIF(
top = 0;
left = 0;
- memset(statePtr, 0, sizeof(state));
+ memset(&state, 0, sizeof(state));
- statePtr->pixelSize = blockPtr->pixelSize;
- statePtr->greenOffset = blockPtr->offset[1]-blockPtr->offset[0];
- statePtr->blueOffset = blockPtr->offset[2]-blockPtr->offset[0];
- statePtr->alphaOffset = blockPtr->offset[0];
- if (statePtr->alphaOffset < blockPtr->offset[2]) {
- statePtr->alphaOffset = blockPtr->offset[2];
+ state.pixelSize = blockPtr->pixelSize;
+ state.greenOffset = blockPtr->offset[1]-blockPtr->offset[0];
+ state.blueOffset = blockPtr->offset[2]-blockPtr->offset[0];
+ state.alphaOffset = blockPtr->offset[0];
+ if (state.alphaOffset < blockPtr->offset[2]) {
+ state.alphaOffset = blockPtr->offset[2];
}
- if (++statePtr->alphaOffset < statePtr->pixelSize) {
- statePtr->alphaOffset -= blockPtr->offset[0];
+ if (++state.alphaOffset < state.pixelSize) {
+ state.alphaOffset -= blockPtr->offset[0];
} else {
- statePtr->alphaOffset = 0;
+ state.alphaOffset = 0;
}
- Tcl_Write(handle, (char *) (statePtr->alphaOffset ? GIF89a : GIF87a), 6);
+ Tcl_Write(handle, (char *) (state.alphaOffset ? GIF89a : GIF87a), 6);
for (x=0 ; x<MAXCOLORMAPSIZE ; x++) {
- statePtr->mapa[x][CM_RED] = 255;
- statePtr->mapa[x][CM_GREEN] = 255;
- statePtr->mapa[x][CM_BLUE] = 255;
+ state.mapa[x][CM_RED] = 255;
+ state.mapa[x][CM_GREEN] = 255;
+ state.mapa[x][CM_BLUE] = 255;
}
width = blockPtr->width;
height = blockPtr->height;
- statePtr->pixelo = blockPtr->pixelPtr + blockPtr->offset[0];
- statePtr->pixelPitch = blockPtr->pitch;
- savemap(statePtr, blockPtr, statePtr->mapa);
- if (statePtr->num >= MAXCOLORMAPSIZE) {
+ state.pixelo = blockPtr->pixelPtr + blockPtr->offset[0];
+ state.pixelPitch = blockPtr->pitch;
+ savemap(&state, blockPtr);
+ if (state.num >= MAXCOLORMAPSIZE) {
Tcl_AppendResult(interp, "too many colors", NULL);
return TCL_ERROR;
}
- if (statePtr->num<2) {
- statePtr->num = 2;
+ if (state.num<2) {
+ state.num = 2;
}
c = LSB(width);
Tcl_Write(handle, (char *) &c, 1);
@@ -1564,13 +1561,13 @@ CommonWriteGIF(
Tcl_Write(handle, (char *) &c, 1);
resolution = 0;
- while (statePtr->num >> resolution) {
+ while (state.num >> resolution) {
resolution++;
}
c = 111 + resolution * 17;
Tcl_Write(handle, (char *) &c, 1);
- statePtr->num = 1 << resolution;
+ state.num = 1 << resolution;
/*
* Background color
@@ -1585,12 +1582,12 @@ CommonWriteGIF(
Tcl_Write(handle, (char *) &c, 1);
- for (x=0 ; x<statePtr->num ; x++) {
- c = statePtr->mapa[x][CM_RED];
+ for (x=0 ; x<state.num ; x++) {
+ c = state.mapa[x][CM_RED];
Tcl_Write(handle, (char *) &c, 1);
- c = statePtr->mapa[x][CM_GREEN];
+ c = state.mapa[x][CM_GREEN];
Tcl_Write(handle, (char *) &c, 1);
- c = statePtr->mapa[x][CM_BLUE];
+ c = state.mapa[x][CM_BLUE];
Tcl_Write(handle, (char *) &c, 1);
}
@@ -1598,7 +1595,7 @@ CommonWriteGIF(
* Write out extension for transparent colour index, if necessary.
*/
- if (statePtr->alphaOffset) {
+ if (state.alphaOffset) {
c = GIF_EXTENSION;
Tcl_Write(handle, (char *) &c, 1);
Tcl_Write(handle, "\371\4\1\0\0\0", 7);
@@ -1630,9 +1627,9 @@ CommonWriteGIF(
c = resolution;
Tcl_Write(handle, (char *) &c, 1);
- statePtr->ssize = statePtr->rsize = blockPtr->width;
- statePtr->csize = blockPtr->height;
- compress(resolution+1, handle, ReadValue, (ClientData) statePtr);
+ state.ssize = state.rsize = blockPtr->width;
+ state.csize = blockPtr->height;
+ compress(resolution+1, handle, ReadValue, &state);
c = 0;
Tcl_Write(handle, (char *) &c, 1);
@@ -1645,14 +1642,13 @@ CommonWriteGIF(
static int
color(
GifWriterState *statePtr,
- int red, int green, int blue,
- unsigned char mapa[MAXCOLORMAPSIZE][3])
+ int red, int green, int blue)
{
int x = (statePtr->alphaOffset != 0);
for (; x<=MAXCOLORMAPSIZE ; x++) {
- if ((mapa[x][CM_RED] == red) && (mapa[x][CM_GREEN] == green) &&
- (mapa[x][CM_BLUE] == blue)) {
+ if ((statePtr->mapa[x][CM_RED] == red) && (statePtr->mapa[x][CM_GREEN] == green) &&
+ (statePtr->mapa[x][CM_BLUE] == blue)) {
return x;
}
}
@@ -1662,14 +1658,13 @@ color(
static int
nuevo(
GifWriterState *statePtr,
- int red, int green, int blue,
- unsigned char mapa[MAXCOLORMAPSIZE][3])
+ int red, int green, int blue)
{
int x = (statePtr->alphaOffset != 0);
for (; x<=statePtr->num ; x++) {
- if ((mapa[x][CM_RED] == red) && (mapa[x][CM_GREEN] == green) &&
- (mapa[x][CM_BLUE] == blue)) {
+ if ((statePtr->mapa[x][CM_RED] == red) && (statePtr->mapa[x][CM_GREEN] == green) &&
+ (statePtr->mapa[x][CM_BLUE] == blue)) {
return 0;
}
}
@@ -1679,8 +1674,7 @@ nuevo(
static void
savemap(
GifWriterState *statePtr,
- Tk_PhotoImageBlock *blockPtr,
- unsigned char mapa[MAXCOLORMAPSIZE][3])
+ Tk_PhotoImageBlock *blockPtr)
{
unsigned char *colores;
int x, y;
@@ -1688,9 +1682,9 @@ savemap(
if (statePtr->alphaOffset) {
statePtr->num = 0;
- mapa[0][CM_RED] = 0xd9;
- mapa[0][CM_GREEN] = 0xd9;
- mapa[0][CM_BLUE] = 0xd9;
+ statePtr->mapa[0][CM_RED] = 0xd9;
+ statePtr->mapa[0][CM_GREEN] = 0xd9;
+ statePtr->mapa[0][CM_BLUE] = 0xd9;
} else {
statePtr->num = -1;
}
@@ -1702,14 +1696,14 @@ savemap(
red = colores[0];
green = colores[statePtr->greenOffset];
blue = colores[statePtr->blueOffset];
- if (nuevo(statePtr, red, green, blue, mapa)) {
+ if (nuevo(statePtr, red, green, blue)) {
statePtr->num++;
if (statePtr->num >= MAXCOLORMAPSIZE) {
return;
}
- mapa[statePtr->num][CM_RED] = red;
- mapa[statePtr->num][CM_GREEN] = green;
- mapa[statePtr->num][CM_BLUE] = blue;
+ statePtr->mapa[statePtr->num][CM_RED] = red;
+ statePtr->mapa[statePtr->num][CM_GREEN] = green;
+ statePtr->mapa[statePtr->num][CM_BLUE] = blue;
}
}
colores += statePtr->pixelSize;
@@ -1719,9 +1713,8 @@ savemap(
static int
ReadValue(
- ClientData clientData)
+ GifWriterState *statePtr)
{
- GifWriterState *statePtr = (GifWriterState *) clientData;
unsigned int col;
if (statePtr->csize == 0) {
@@ -1732,7 +1725,7 @@ ReadValue(
} else {
col = color(statePtr, statePtr->pixelo[0],
statePtr->pixelo[statePtr->greenOffset],
- statePtr->pixelo[statePtr->blueOffset], statePtr->mapa);
+ statePtr->pixelo[statePtr->blueOffset]);
}
statePtr->pixelo += statePtr->pixelSize;
if (--statePtr->ssize <= 0) {
@@ -2175,63 +2168,63 @@ compress(
int initBits,
Tcl_Channel handle,
ifunptr readValue,
- ClientData clientData)
+ GifWriterState *statePtr)
{
int c;
- miGIFState_t state, *statePtr = &state;
+ miGIFState_t state;
- memset(statePtr, 0, sizeof(state));
+ memset(&state, 0, sizeof(state));
- statePtr->ofile = handle;
- statePtr->obuf = 0;
- statePtr->obits = 0;
- statePtr->oblen = 0;
- statePtr->codeClear = 1 << (initBits - 1);
- statePtr->codeEOF = statePtr->codeClear + 1;
- statePtr->runlengthBaseCode = statePtr->codeEOF + 1;
- statePtr->outputBumpInit = (1 << (initBits - 1)) - 1;
+ state.ofile = handle;
+ state.obuf = 0;
+ state.obits = 0;
+ state.oblen = 0;
+ state.codeClear = 1 << (initBits - 1);
+ state.codeEOF = state.codeClear + 1;
+ state.runlengthBaseCode = state.codeEOF + 1;
+ state.outputBumpInit = (1 << (initBits - 1)) - 1;
/*
* For images with a lot of runs, making outputClearInit larger will give
* better compression.
*/
- statePtr->outputClearInit =
- (initBits <= 3) ? 9 : (statePtr->outputBumpInit-1);
+ state.outputClearInit =
+ (initBits <= 3) ? 9 : (state.outputBumpInit-1);
#ifdef MIGIF_DEBUGGING_ENVARS
{
const char *ocienv = getenv("MIGIF_OUT_CLEAR_INIT");
if (ocienv) {
- statePtr->outputClearInit = atoi(ocienv);
+ state.outputClearInit = atoi(ocienv);
DEBUGMSG(("[overriding outputClearInit to %d]\n",
- statePtr->outputClearInit));
+ state.outputClearInit));
}
}
#endif
- statePtr->outputBitsInit = initBits;
- statePtr->maxOcodes =
- (1 << GIFBITS) - ((1 << (statePtr->outputBitsInit - 1)) + 3);
- didClear(statePtr);
- output(statePtr, statePtr->codeClear);
- statePtr->runlengthCount = 0;
+ state.outputBitsInit = initBits;
+ state.maxOcodes =
+ (1 << GIFBITS) - ((1 << (state.outputBitsInit - 1)) + 3);
+ didClear(&state);
+ output(&state, state.codeClear);
+ state.runlengthCount = 0;
while (1) {
- c = readValue(clientData);
- if (statePtr->runlengthCount>0 && statePtr->runlengthPixel!=c) {
- runlengthFlush(statePtr);
+ c = readValue(statePtr);
+ if (state.runlengthCount>0 && state.runlengthPixel!=c) {
+ runlengthFlush(&state);
}
if (c == EOF) {
break;
}
- if (statePtr->runlengthPixel == c) {
- statePtr->runlengthCount++;
+ if (state.runlengthPixel == c) {
+ state.runlengthCount++;
} else {
- statePtr->runlengthPixel = c;
- statePtr->runlengthCount = 1;
+ state.runlengthPixel = c;
+ state.runlengthCount = 1;
}
}
- output(statePtr, statePtr->codeEOF);
- outputFlush(statePtr);
+ output(&state, state.codeEOF);
+ outputFlush(&state);
}
/*