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-rw-r--r--generic/tkImgGIF.c307
1 files changed, 169 insertions, 138 deletions
diff --git a/generic/tkImgGIF.c b/generic/tkImgGIF.c
index 32c784e..473ed3c 100644
--- a/generic/tkImgGIF.c
+++ b/generic/tkImgGIF.c
@@ -13,8 +13,8 @@
* Copyright (c) 1997 Australian National University
* Copyright (c) 2005 Donal K. Fellows
*
- * See the file "license.terms" for information on usage and redistribution
- * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
+ * See the file "license.terms" for information on usage and redistribution of
+ * this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* This file also contains code from the giftoppm program, which is
* copyrighted as follows:
@@ -32,9 +32,11 @@
* 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 1.37 2007/09/11 18:05:04 rmax Exp $
+ * RCS: @(#) $Id: tkImgGIF.c,v 1.38 2007/09/18 12:37:13 dkf Exp $
*/
+#include "tkInt.h"
+
/*
* GIF's are represented as data in either binary or base64 format. base64
* strings consist of 4 6-bit characters -> 3 8 bit bytes. A-Z, a-z, 0-9, +
@@ -61,8 +63,6 @@ typedef struct mFile {
int length; /* Total amount of bytes in data */
} MFile;
-#include "tkInt.h"
-
/*
* Non-ASCII encoding support:
* Most data in a GIF image is binary and is treated as such. However, a few
@@ -73,16 +73,22 @@ typedef struct mFile {
* independant.
*/
-static CONST char GIF87a[] = { /* ASCII GIF87a */
+static const char GIF87a[] = { /* ASCII GIF87a */
0x47, 0x49, 0x46, 0x38, 0x37, 0x61, 0x00
};
-static CONST char GIF89a[] = { /* ASCII GIF89a */
+static const char GIF89a[] = { /* ASCII GIF89a */
0x47, 0x49, 0x46, 0x38, 0x39, 0x61, 0x00
};
#define GIF_TERMINATOR 0x3b /* ASCII ; */
#define GIF_EXTENSION 0x21 /* ASCII ! */
#define GIF_START 0x2c /* ASCII , */
+/*
+ * Flags used to notify that we've got inline data instead of a file to read
+ * from. Note that we need to figure out which type of inline data we've got
+ * before handing off to the GIF reading code; this is done in StringReadGIF.
+ */
+
#define INLINE_DATA_BINARY ((const char *) 0x01)
#define INLINE_DATA_BASE64 ((const char *) 0x02)
@@ -109,11 +115,11 @@ typedef struct {
* The format record for the GIF file format:
*/
-static int FileMatchGIF(Tcl_Channel chan, CONST char *fileName,
+static int FileMatchGIF(Tcl_Channel chan, const char *fileName,
Tcl_Obj *format, int *widthPtr, int *heightPtr,
Tcl_Interp *interp);
static int FileReadGIF(Tcl_Interp *interp, Tcl_Channel chan,
- CONST char *fileName, Tcl_Obj *format,
+ const char *fileName, Tcl_Obj *format,
Tk_PhotoHandle imageHandle, int destX, int destY,
int width, int height, int srcX, int srcY);
static int StringMatchGIF(Tcl_Obj *dataObj, Tcl_Obj *format,
@@ -122,7 +128,7 @@ static int StringReadGIF(Tcl_Interp *interp, Tcl_Obj *dataObj,
Tcl_Obj *format, Tk_PhotoHandle imageHandle,
int destX, int destY, int width, int height,
int srcX, int srcY);
-static int FileWriteGIF(Tcl_Interp *interp, CONST char *filename,
+static int FileWriteGIF(Tcl_Interp *interp, const char *filename,
Tcl_Obj *format, Tk_PhotoImageBlock *blockPtr);
static int CommonWriteGIF(Tcl_Interp *interp, Tcl_Channel handle,
Tcl_Obj *format, Tk_PhotoImageBlock *blockPtr);
@@ -165,11 +171,10 @@ static int ReadColorMap(GIFImageConfig *gifConfPtr,
static int ReadGIFHeader(GIFImageConfig *gifConfPtr,
Tcl_Channel chan, int *widthPtr, int *heightPtr);
static int ReadImage(GIFImageConfig *gifConfPtr,
- Tcl_Interp *interp, char *imagePtr,
+ Tcl_Interp *interp, unsigned char *imagePtr,
Tcl_Channel chan, int len, int rows,
- unsigned char cmap[MAXCOLORMAPSIZE][4],
- int width, int height, int srcX, int srcY,
- int interlace, int transparent);
+ unsigned char cmap[MAXCOLORMAPSIZE][4], int srcX,
+ int srcY, int interlace, int transparent);
/*
* these are for the BASE64 image reader code only
@@ -205,7 +210,7 @@ static void mInit(unsigned char *string, MFile *handle,
static int
FileMatchGIF(
Tcl_Channel chan, /* The image file, open for reading. */
- CONST char *fileName, /* The name of the image file. */
+ const char *fileName, /* The name of the image file. */
Tcl_Obj *format, /* User-specified format object, or NULL. */
int *widthPtr, int *heightPtr,
/* The dimensions of the image are returned
@@ -241,7 +246,7 @@ static int
FileReadGIF(
Tcl_Interp *interp, /* Interpreter to use for reporting errors. */
Tcl_Channel chan, /* The image file, open for reading. */
- CONST char *fileName, /* The name of the image file. */
+ const char *fileName, /* The name of the image file. */
Tcl_Obj *format, /* User-specified format object, or NULL. */
Tk_PhotoHandle imageHandle, /* The photo image to write into. */
int destX, int destY, /* Coordinates of top-left pixel in photo
@@ -252,15 +257,14 @@ FileReadGIF(
* image being read. */
{
int fileWidth, fileHeight, imageWidth, imageHeight;
- int nBytes, index = 0, argc = 0, i;
+ int nBytes, index = 0, argc = 0, i, result = TCL_ERROR;
Tcl_Obj **objv;
- Tk_PhotoImageBlock block;
unsigned char buf[100];
unsigned char *trashBuffer = NULL;
int bitPixel;
unsigned char colorMap[MAXCOLORMAPSIZE][4];
int transparent = -1;
- static CONST char *optionStrings[] = {
+ static const char *optionStrings[] = {
"-index", NULL
};
GIFImageConfig gifConf, *gifConfPtr = &gifConf;
@@ -276,6 +280,10 @@ FileReadGIF(
fileName = "inline data";
}
+ /*
+ * Parse the format string to get options.
+ */
+
if (format && Tcl_ListObjGetElements(interp, format,
&argc, &objv) != TCL_OK) {
return TCL_ERROR;
@@ -294,6 +302,11 @@ FileReadGIF(
return TCL_ERROR;
}
}
+
+ /*
+ * Read the GIF file header and check for some sanity.
+ */
+
if (!ReadGIFHeader(gifConfPtr, chan, &fileWidth, &fileHeight)) {
Tcl_AppendResult(interp, "couldn't read GIF header from file \"",
fileName, "\"", NULL);
@@ -305,10 +318,14 @@ FileReadGIF(
return TCL_ERROR;
}
+ /*
+ * Get the general colormap information.
+ */
+
if (Fread(gifConfPtr, buf, 1, 3, chan) != 3) {
return TCL_OK;
}
- bitPixel = 2<<(buf[0]&0x07);
+ bitPixel = 2 << (buf[0] & 0x07);
if (BitSet(buf[0], LOCALCOLORMAP)) { /* Global Colormap */
if (!ReadColorMap(gifConfPtr, chan, bitPixel, colorMap)) {
@@ -328,20 +345,19 @@ FileReadGIF(
return TCL_OK;
}
+ /*
+ * Make sure we have enough space in the photo image to hold the data from
+ * the GIF.
+ */
+
if (Tk_PhotoExpand(interp, imageHandle,
destX + width, destY + height) != TCL_OK) {
return TCL_ERROR;
}
- block.width = width;
- block.height = height;
- block.pixelSize = 4;
- block.pitch = block.pixelSize * block.width;
- block.offset[0] = 0;
- block.offset[1] = 1;
- block.offset[2] = 2;
- block.offset[3] = 3;
- block.pixelPtr = NULL;
+ /*
+ * Search for the frame from the GIF to display.
+ */
while (1) {
if (Fread(gifConfPtr, buf, 1, 1, chan) != 1) {
@@ -354,16 +370,12 @@ FileReadGIF(
goto error;
}
- if (buf[0] == GIF_TERMINATOR) {
- /*
- * GIF terminator.
- */
-
+ switch (buf[0]) {
+ case GIF_TERMINATOR:
Tcl_AppendResult(interp, "no image data for this index", NULL);
goto error;
- }
- if (buf[0] == GIF_EXTENSION) {
+ case GIF_EXTENSION:
/*
* This is a GIF extension.
*/
@@ -381,9 +393,15 @@ FileReadGIF(
goto error;
}
continue;
- }
-
- if (buf[0] != GIF_START) {
+ case GIF_START:
+ if (Fread(gifConfPtr, buf, 1, 9, chan) != 9) {
+ Tcl_SetResult(interp,
+ "couldn't read left/top/width/height in GIF image",
+ TCL_STATIC);
+ goto error;
+ }
+ break;
+ default:
/*
* Not a valid start character; ignore it.
*/
@@ -391,21 +409,18 @@ FileReadGIF(
continue;
}
- if (Fread(gifConfPtr, buf, 1, 9, chan) != 9) {
- Tcl_SetResult(interp,
- "couldn't read left/top/width/height in GIF image",
- TCL_STATIC);
- goto error;
- }
+ /*
+ * We've read the header for a GIF frame. Work out what we are going
+ * to do about it.
+ */
imageWidth = LM_to_uint(buf[4], buf[5]);
imageHeight = LM_to_uint(buf[6], buf[7]);
-
- bitPixel = 1<<((buf[8]&0x07)+1);
+ bitPixel = 1 << ((buf[8] & 0x07) + 1);
if (index--) {
/*
- * This is not the image we want to read: skip it.
+ * This is not the GIF frame we want to read: skip it.
*/
if (BitSet(buf[8], LOCALCOLORMAP)) {
@@ -421,7 +436,7 @@ FileReadGIF(
if (trashBuffer == NULL) {
nBytes = fileWidth * fileHeight * 3;
- trashBuffer = (unsigned char *) ckalloc((unsigned int) nBytes);
+ trashBuffer = (unsigned char *) ckalloc((unsigned) nBytes);
}
/*
@@ -441,81 +456,93 @@ FileReadGIF(
* common case.
*/
- if (ReadImage(gifConfPtr, interp, (char *)trashBuffer, chan,
- imageWidth, imageHeight, colorMap, 0, 0, 0, 0, 0,
- -1) != TCL_OK) {
+ if (ReadImage(gifConfPtr, interp, trashBuffer, chan, imageWidth,
+ imageHeight, colorMap, 0, 0, 0, -1) != TCL_OK) {
goto error;
}
continue;
}
+ break;
+ }
- if (BitSet(buf[8], LOCALCOLORMAP)) {
- if (!ReadColorMap(gifConfPtr, chan, bitPixel, colorMap)) {
- Tcl_AppendResult(interp, "error reading color map", NULL);
- goto error;
- }
- }
+ /*
+ * Found the frame we want to read. Next, check for a local color map for
+ * this frame.
+ */
- index = LM_to_uint(buf[0], buf[1]);
- srcX -= index;
- if (srcX<0) {
- destX -= srcX; width += srcX;
- srcX = 0;
+ if (BitSet(buf[8], LOCALCOLORMAP)) {
+ if (!ReadColorMap(gifConfPtr, chan, bitPixel, colorMap)) {
+ Tcl_AppendResult(interp, "error reading color map", NULL);
+ goto error;
}
+ }
- if (width > imageWidth) {
- width = imageWidth;
- }
+ /*
+ * Extract the location within the overall visible image to put the data
+ * in this frame, together with the size of this frame.
+ */
- index = LM_to_uint(buf[2], buf[3]);
- srcY -= index;
- if (index > srcY) {
- destY -= srcY; height += srcY;
- srcY = 0;
- }
- if (height > imageHeight) {
- height = imageHeight;
- }
+ index = LM_to_uint(buf[0], buf[1]);
+ srcX -= index;
+ if (srcX<0) {
+ destX -= srcX; width += srcX;
+ srcX = 0;
+ }
- if ((width <= 0) || (height <= 0)) {
- block.pixelPtr = 0;
- goto noerror;
- }
+ if (width > imageWidth) {
+ width = imageWidth;
+ }
+
+ index = LM_to_uint(buf[2], buf[3]);
+ srcY -= index;
+ if (index > srcY) {
+ destY -= srcY; height += srcY;
+ srcY = 0;
+ }
+ if (height > imageHeight) {
+ height = imageHeight;
+ }
+
+ if ((width > 0) && (height > 0)) {
+ Tk_PhotoImageBlock block;
+
+ /*
+ * Read the data and put it into the photo buffer for display by the
+ * general image machinery.
+ */
block.width = width;
block.height = height;
block.pixelSize = (transparent>=0) ? 4 : 3;
+ block.offset[0] = 0;
+ block.offset[1] = 1;
+ block.offset[2] = 2;
block.offset[3] = (transparent>=0) ? 3 : 0;
block.pitch = block.pixelSize * imageWidth;
nBytes = block.pitch * imageHeight;
block.pixelPtr = (unsigned char *) ckalloc((unsigned) nBytes);
- if (ReadImage(gifConfPtr, interp, (char *) block.pixelPtr, chan,
- imageWidth,imageHeight, colorMap, fileWidth,fileHeight,
- srcX,srcY, BitSet(buf[8],INTERLACE), transparent) != TCL_OK) {
+ if (ReadImage(gifConfPtr, interp, block.pixelPtr, chan, imageWidth,
+ imageHeight, colorMap, srcX, srcY, BitSet(buf[8],INTERLACE),
+ transparent) != TCL_OK) {
+ ckfree((char *) block.pixelPtr);
goto error;
}
- break;
- }
-
- if (Tk_PhotoPutBlock(interp, imageHandle, &block, destX, destY,
- width, height, TK_PHOTO_COMPOSITE_SET) != TCL_OK) {
- goto error;
+ if (Tk_PhotoPutBlock(interp, imageHandle, &block, destX, destY,
+ width, height, TK_PHOTO_COMPOSITE_SET) != TCL_OK) {
+ ckfree((char *) block.pixelPtr);
+ goto error;
+ }
+ ckfree((char *) block.pixelPtr);
}
- noerror:
/*
- * If a trash buffer has been allocated, free it now.
+ * We've successfully read the GIF frame (or there was nothing to read,
+ * which suits as well). We're done.
*/
- if (trashBuffer != NULL) {
- ckfree((char *)trashBuffer);
- }
- if (block.pixelPtr) {
- ckfree((char *) block.pixelPtr);
- }
Tcl_AppendResult(interp, tkImgFmtGIF.name, NULL);
- return TCL_OK;
+ result = TCL_OK;
error:
/*
@@ -523,12 +550,9 @@ FileReadGIF(
*/
if (trashBuffer != NULL) {
- ckfree((char *)trashBuffer);
+ ckfree((char *) trashBuffer);
}
- if (block.pixelPtr) {
- ckfree((char *) block.pixelPtr);
- }
- return TCL_ERROR;
+ return result;
}
/*
@@ -589,7 +613,7 @@ StringMatchGIF(
return 0;
}
} else {
- memcpy((void *) header, (void *) data, 10);
+ memcpy(header, data, 10);
}
*widthPtr = LM_to_uint(header[6], header[7]);
*heightPtr = LM_to_uint(header[8], header[9]);
@@ -628,24 +652,32 @@ StringReadGIF(
{
MFile handle, *hdlPtr = &handle;
int length;
- char *data = (char *) Tcl_GetByteArrayFromObj(dataObj, &length);
+ const char *xferFormat;
+ unsigned char *data = Tcl_GetByteArrayFromObj(dataObj, &length);
- mInit((unsigned char *)data, hdlPtr, length);
+ mInit(data, hdlPtr, length);
- if (strncmp(GIF87a, data, 6) && strncmp(GIF89a, data, 6)) {
- /*
- * Check whether the data is Base64 encoded by doing a
- * character-by-charcter comparison with the binary-format headers;
- * BASE64-encoded never matches (matching the other way is harder
- * because of potential padding).
- */
+ /*
+ * Check whether the data is Base64 encoded by doing a character-by-
+ * charcter comparison with the binary-format headers; BASE64-encoded
+ * never matches (matching the other way is harder because of potential
+ * padding of the BASE64 data).
+ */
- return FileReadGIF(interp, (Tcl_Channel) hdlPtr, INLINE_DATA_BASE64,
- format, imageHandle, destX, destY, width, height, srcX, srcY);
+ if (strncmp(GIF87a, (unsigned char *) data, 6)
+ && strncmp(GIF89a, (unsigned char *) data, 6)) {
+ xferFormat = INLINE_DATA_BASE64;
} else {
- return FileReadGIF(interp, (Tcl_Channel) hdlPtr, INLINE_DATA_BINARY,
- format, imageHandle, destX, destY, width, height, srcX, srcY);
+ xferFormat = INLINE_DATA_BINARY;
}
+
+ /*
+ * Fall through to the file reader now that we have a correctly-configured
+ * pseudo-channel to pull the data from.
+ */
+
+ return FileReadGIF(interp, (Tcl_Channel) hdlPtr, xferFormat, format,
+ imageHandle, destX, destY, width, height, srcX, srcY);
}
/*
@@ -694,8 +726,8 @@ ReadGIFHeader(
/*
*-----------------------------------------------------------------
- * The code below is copied from the giftoppm program and modified
- * just slightly.
+ * The code below is copied from the giftoppm program and modified just
+ * slightly.
*-----------------------------------------------------------------
*/
@@ -818,20 +850,19 @@ static int
ReadImage(
GIFImageConfig *gifConfPtr,
Tcl_Interp *interp,
- char *imagePtr,
+ unsigned char *imagePtr,
Tcl_Channel chan,
int len, int rows,
unsigned char cmap[MAXCOLORMAPSIZE][4],
- int width, int height,
int srcX, int srcY,
int interlace,
int transparent)
{
unsigned char initialCodeSize;
int xpos = 0, ypos = 0, pass = 0, i;
- register char *pixelPtr;
- static CONST int interlaceStep[] = { 8, 8, 4, 2 };
- static CONST int interlaceStart[] = { 0, 4, 2, 1 };
+ register unsigned char *pixelPtr;
+ static const int interlaceStep[] = { 8, 8, 4, 2 };
+ static const int interlaceStart[] = { 0, 4, 2, 1 };
unsigned short prefix[(1 << MAX_LWZ_BITS)];
unsigned char append[(1 << MAX_LWZ_BITS)];
unsigned char stack[(1 << MAX_LWZ_BITS)*2];
@@ -874,8 +905,8 @@ ReadImage(
oldCode = -1;
firstCode = -1;
- memset((void *)prefix, 0, (1 << MAX_LWZ_BITS) * sizeof(short));
- memset((void *)append, 0, (1 << MAX_LWZ_BITS) * sizeof(char));
+ memset(prefix, 0, (1 << MAX_LWZ_BITS) * sizeof(short));
+ memset(append, 0, (1 << MAX_LWZ_BITS) * sizeof(char));
for (i = 0; i < clearCode; i++) {
append[i] = i;
}
@@ -1346,18 +1377,17 @@ Fread(
size_t hunk, size_t count, /* how many */
Tcl_Channel chan)
{
- MFile *handle;
-
if (gifConfPtr->fromData == INLINE_DATA_BASE64) {
return Mread(dst, hunk, count, (MFile *) chan);
}
if (gifConfPtr->fromData == INLINE_DATA_BINARY) {
- handle = (MFile *) chan;
- if (handle->length <= 0 || (size_t)handle->length < hunk*count) {
+ MFile *handle = (MFile *) chan;
+
+ if (handle->length <= 0 || (size_t) handle->length < hunk*count) {
return -1;
}
- memcpy((void *)dst, (void *) handle->data, (size_t) (hunk * count));
+ memcpy(dst, handle->data, (size_t) (hunk * count));
handle->data += hunk * count;
return (int)(hunk * count);
}
@@ -1442,7 +1472,7 @@ static int ReadValue(ClientData clientData);
static int
FileWriteGIF(
Tcl_Interp *interp, /* Interpreter to use for reporting errors. */
- CONST char *filename,
+ const char *filename,
Tcl_Obj *format,
Tk_PhotoImageBlock *blockPtr)
{
@@ -1612,8 +1642,9 @@ color(
int red, int green, int blue,
unsigned char mapa[MAXCOLORMAPSIZE][3])
{
- int x;
- for (x=(statePtr->alphaOffset != 0) ; x<=MAXCOLORMAPSIZE ; x++) {
+ 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)) {
return x;
@@ -1629,6 +1660,7 @@ nuevo(
unsigned char mapa[MAXCOLORMAPSIZE][3])
{
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)) {
@@ -1657,9 +1689,9 @@ savemap(
statePtr->num = -1;
}
- for(y=0 ; y<blockPtr->height ; y++) {
+ for (y=0 ; y<blockPtr->height ; y++) {
colores = blockPtr->pixelPtr + blockPtr->offset[0] + y*blockPtr->pitch;
- for(x=0 ; x<blockPtr->width ; x++) {
+ for (x=0 ; x<blockPtr->width ; x++) {
if (!statePtr->alphaOffset || colores[statePtr->alphaOffset]!=0) {
red = colores[0];
green = colores[statePtr->greenOffset];
@@ -1677,7 +1709,6 @@ savemap(
colores += statePtr->pixelSize;
}
}
- return;
}
static int
@@ -1972,8 +2003,8 @@ computeTriangleCount(
count -= perrep;
}
if (count > 0) {
- unsigned int n;
- n = isqrt(count);
+ unsigned int n = isqrt(count);
+
while (n*(n+1) >= 2*count) {
n--;
}
generated by cgit v0.12 at 2024-11-01 04:08:08 (GMT)