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150 lines
4.5 KiB
Plaintext
150 lines
4.5 KiB
Plaintext
====================================================================
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The PIL Bitmap Booster Patch
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====================================================================
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The pilbitmap booster patch greatly improves performance of the
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ImageTk.BitmapImage constructor. Unfortunately, the design of Tk
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doesn't allow us to do this from the tkImaging interface module, so
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you have to patch the Tk sources.
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Once installed, the ImageTk module will automatically detect this
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patch.
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(Note: this patch has been tested with Tk 8.0 on Win32 only, but it
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should work just fine on other platforms as well).
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1. To the beginning of TkGetBitmapData (in generic/tkImgBmap.c), add
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the following stuff:
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------------------------------------------------------------------------
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int width, height, numBytes, hotX, hotY;
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char *p, *end, *expandedFileName;
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ParseInfo pi;
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char *data = NULL;
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Tcl_DString buffer;
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/* ==================================================================== */
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/* The pilbitmap booster patch -- patch section */
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/* ==================================================================== */
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char *PILGetBitmapData();
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if (string) {
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/* Is this a PIL bitmap reference? */
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data = PILGetBitmapData(string, widthPtr, heightPtr, hotXPtr, hotYPtr);
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if (data)
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return data;
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}
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/* ==================================================================== */
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pi.string = string;
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if (string == NULL) {
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if (Tcl_IsSafe(interp)) {
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------------------------------------------------------------------------
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2. Append the following to the same file (you may wish to include
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Imaging.h instead of copying the struct declaration...)
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------------------------------------------------------------------------
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/* ==================================================================== */
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/* The pilbitmap booster patch -- code section */
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/* ==================================================================== */
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/* Imaging declaration boldly copied from Imaging.h (!) */
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typedef struct ImagingInstance *Imaging; /* a.k.a. ImagingImage :-) */
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typedef unsigned char UINT8;
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typedef int INT32;
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struct ImagingInstance {
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/* Format */
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char mode[4+1]; /* Band names ("1", "L", "P", "RGB", "RGBA", "CMYK") */
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int type; /* Always 0 in this version */
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int depth; /* Always 8 in this version */
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int bands; /* Number of bands (1, 3, or 4) */
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int xsize; /* Image dimension. */
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int ysize;
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/* Colour palette (for "P" images only) */
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void* palette;
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/* Data pointers */
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UINT8 **image8; /* Set for 8-bit image (pixelsize=1). */
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INT32 **image32; /* Set for 32-bit image (pixelsize=4). */
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/* Internals */
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char **image; /* Actual raster data. */
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char *block; /* Set if data is allocated in a single block. */
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int pixelsize; /* Size of a pixel, in bytes (1 or 4) */
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int linesize; /* Size of a line, in bytes (xsize * pixelsize) */
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/* Virtual methods */
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void (*im_delete)(Imaging *);
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};
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/* The pilbitmap booster patch allows you to pass PIL images to the
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Tk bitmap decoder. Passing images this way is much more efficient
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than using the "tobitmap" method. */
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char *
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PILGetBitmapData(string, widthPtr, heightPtr, hotXPtr, hotYPtr)
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char *string;
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int *widthPtr, *heightPtr;
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int *hotXPtr, *hotYPtr;
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{
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char* data;
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char* p;
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int y;
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Imaging im;
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if (strncmp(string, "PIL:", 4) != 0)
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return NULL;
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im = (Imaging) atol(string + 4);
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if (strcmp(im->mode, "1") != 0 && strcmp(im->mode, "L") != 0)
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return NULL;
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data = p = (char *) ckalloc((unsigned) ((im->xsize+7)/8) * im->ysize);
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for (y = 0; y < im->ysize; y++) {
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char* in = im->image8[y];
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int i, m, b;
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b = 0; m = 1;
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for (i = 0; i < im->xsize; i++) {
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if (in[i] != 0)
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b |= m;
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m <<= 1;
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if (m == 256){
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*p++ = b;
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b = 0; m = 1;
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}
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}
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if (m != 1)
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*p++ = b;
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}
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*widthPtr = im->xsize;
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*heightPtr = im->ysize;
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*hotXPtr = -1;
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*hotYPtr = -1;
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return data;
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}
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/* ==================================================================== */
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------------------------------------------------------------------------
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3. Recompile Tk and relink the _tkinter module (where necessary).
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====================================================================
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Last updated: 97-05-17/fl
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