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authordkf <donal.k.fellows@manchester.ac.uk>2013-11-03 11:29:18 (GMT)
committerdkf <donal.k.fellows@manchester.ac.uk>2013-11-03 11:29:18 (GMT)
commit3205d71a865a9a055c5fc810f39104aad5f91673 (patch)
tree5bc9f53c958fb33d023951ce1fc6188a62990f8e /generic/tkImgPPM.c
parentf46c814d2d9a8f709c8adeb6fdf1da896d80dbee (diff)
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[1632447]: Allow the PPM maxval to go up to 65535, to conform with a format
definition change from around 2000 (even if that's a rare format).
Diffstat (limited to 'generic/tkImgPPM.c')
-rw-r--r--generic/tkImgPPM.c58
1 files changed, 41 insertions, 17 deletions
diff --git a/generic/tkImgPPM.c b/generic/tkImgPPM.c
index 8a46fde..b476ac6 100644
--- a/generic/tkImgPPM.c
+++ b/generic/tkImgPPM.c
@@ -140,7 +140,7 @@ FileReadPPM(
* image being read. */
{
int fileWidth, fileHeight, maxIntensity;
- int nLines, nBytes, h, type, count;
+ int nLines, nBytes, h, type, count, bytesPerChannel = 1;
unsigned char *pixelPtr;
Tk_PhotoImageBlock block;
@@ -155,13 +155,15 @@ FileReadPPM(
"\" has dimension(s) <= 0", NULL);
return TCL_ERROR;
}
- if ((maxIntensity <= 0) || (maxIntensity >= 256)) {
+ if ((maxIntensity <= 0) || (maxIntensity > 0xffff)) {
char buffer[TCL_INTEGER_SPACE];
sprintf(buffer, "%d", maxIntensity);
Tcl_AppendResult(interp, "PPM image file \"", fileName,
"\" has bad maximum intensity value ", buffer, NULL);
return TCL_ERROR;
+ } else if (maxIntensity > 0x00ff) {
+ bytesPerChannel = 2;
}
if ((srcX + width) > fileWidth) {
@@ -171,20 +173,20 @@ FileReadPPM(
height = fileHeight - srcY;
}
if ((width <= 0) || (height <= 0)
- || (srcX >= fileWidth) || (srcY >= fileHeight)) {
+ || (srcX >= fileWidth) || (srcY >= fileHeight)) {
return TCL_OK;
}
if (type == PGM) {
- block.pixelSize = 1;
+ block.pixelSize = 1 * bytesPerChannel;
block.offset[0] = 0;
block.offset[1] = 0;
block.offset[2] = 0;
} else {
- block.pixelSize = 3;
+ block.pixelSize = 3 * bytesPerChannel;
block.offset[0] = 0;
- block.offset[1] = 1;
- block.offset[2] = 2;
+ block.offset[1] = 1 * bytesPerChannel;
+ block.offset[2] = 2 * bytesPerChannel;
}
block.offset[3] = 0;
block.width = width;
@@ -224,12 +226,21 @@ FileReadPPM(
ckfree((char *) pixelPtr);
return TCL_ERROR;
}
- if (maxIntensity != 255) {
+ if (maxIntensity < 0x00ff) {
unsigned char *p;
for (p = pixelPtr; count > 0; count--, p++) {
*p = (((int) *p) * 255)/maxIntensity;
}
+ } else if (maxIntensity > 0x00ff) {
+ unsigned char *p;
+ unsigned int value;
+
+ for (p = pixelPtr; count > 0; count--, p += 2) {
+ value = ((unsigned int) p[0]) * 256 + ((unsigned int) p[1]);
+ value = value * 255 / maxIntensity;
+ p[0] = p[1] = (unsigned char) value;
+ }
}
block.height = nLines;
if (Tk_PhotoPutBlock(interp, imageHandle, &block, destX, destY,
@@ -474,7 +485,7 @@ StringReadPPM(
* image being read. */
{
int fileWidth, fileHeight, maxIntensity;
- int nLines, nBytes, h, type, count, dataSize;
+ int nLines, nBytes, h, type, count, dataSize, bytesPerChannel = 2;
unsigned char *pixelPtr, *dataBuffer;
Tk_PhotoImageBlock block;
@@ -490,7 +501,7 @@ StringReadPPM(
NULL);
return TCL_ERROR;
}
- if ((maxIntensity <= 0) || (maxIntensity >= 256)) {
+ if ((maxIntensity <= 0) || (maxIntensity > 0xffff)) {
char buffer[TCL_INTEGER_SPACE];
sprintf(buffer, "%d", maxIntensity);
@@ -498,6 +509,8 @@ StringReadPPM(
"PPM image data has bad maximum intensity value ", buffer,
NULL);
return TCL_ERROR;
+ } else if (maxIntensity > 0x00ff) {
+ bytesPerChannel = 2;
}
if ((srcX + width) > fileWidth) {
@@ -512,15 +525,15 @@ StringReadPPM(
}
if (type == PGM) {
- block.pixelSize = 1;
+ block.pixelSize = 1 * bytesPerChannel;
block.offset[0] = 0;
block.offset[1] = 0;
block.offset[2] = 0;
} else {
- block.pixelSize = 3;
+ block.pixelSize = 3 * bytesPerChannel;
block.offset[0] = 0;
- block.offset[1] = 1;
- block.offset[2] = 2;
+ block.offset[1] = 1 * bytesPerChannel;
+ block.offset[2] = 2 * bytesPerChannel;
}
block.offset[3] = 0;
block.width = width;
@@ -531,7 +544,7 @@ StringReadPPM(
dataSize -= srcY * block.pitch;
}
- if (maxIntensity == 255) {
+ if (maxIntensity == 0x00ff) {
/*
* We have all the data in memory, so write everything in one go.
*/
@@ -574,8 +587,19 @@ StringReadPPM(
Tcl_AppendResult(interp, "truncated PPM data", NULL);
return TCL_ERROR;
}
- for (p=pixelPtr,count=nBytes ; count>0 ; count--,p++,dataBuffer++) {
- *p = (((int) *dataBuffer) * 255)/maxIntensity;
+ if (maxIntensity < 0x00ff) {
+ for (p=pixelPtr,count=nBytes ; count>0 ; count--,p++,dataBuffer++) {
+ *p = (((int) *dataBuffer) * 255)/maxIntensity;
+ }
+ } else {
+ unsigned char *p;
+ unsigned int value;
+
+ for (p = pixelPtr; count > 0; count--, p += 2) {
+ value = ((unsigned int) p[0]) * 256 + ((unsigned int) p[1]);
+ value = value * 255 / maxIntensity;
+ p[0] = p[1] = (unsigned char) value;
+ }
}
dataSize -= nBytes;
block.height = nLines;