330 lines
7.4 KiB
C
330 lines
7.4 KiB
C
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/*
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* tkWinImage.c --
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*
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* This file contains routines for manipulation full-color images.
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*
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* Copyright (c) 1995 Sun Microsystems, Inc.
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*
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* See the file "license.terms" for information on usage and redistribution
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* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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*
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* SCCS: @(#) tkWinImage.c 1.13 97/07/07 11:19:45
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*/
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#include "tkWinInt.h"
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static int DestroyImage _ANSI_ARGS_((XImage* data));
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static unsigned long ImageGetPixel _ANSI_ARGS_((XImage *image, int x, int y));
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static int PutPixel _ANSI_ARGS_((XImage *image, int x, int y,
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unsigned long pixel));
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/*
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*----------------------------------------------------------------------
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*
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* DestroyImage --
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*
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* This is a trivial wrapper around ckfree to make it possible to
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* pass ckfree as a pointer.
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*
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* Results:
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* None.
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*
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* Side effects:
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* Deallocates the image.
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*
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*----------------------------------------------------------------------
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*/
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int
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DestroyImage(imagePtr)
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XImage *imagePtr; /* image to free */
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{
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if (imagePtr) {
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if (imagePtr->data) {
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ckfree((char*)imagePtr->data);
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}
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ckfree((char*)imagePtr);
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}
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return 0;
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}
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/*
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*----------------------------------------------------------------------
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*
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* ImageGetPixel --
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*
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* Get a single pixel from an image.
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*
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* Results:
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* Returns the 32 bit pixel value.
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*
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* Side effects:
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* None.
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*
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*----------------------------------------------------------------------
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*/
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unsigned long
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ImageGetPixel(image, x, y)
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XImage *image;
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int x, y;
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{
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unsigned long pixel = 0;
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unsigned char *srcPtr = &(image->data[(y * image->bytes_per_line)
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+ ((x * image->bits_per_pixel) / NBBY)]);
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switch (image->bits_per_pixel) {
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case 32:
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case 24:
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pixel = RGB(srcPtr[2], srcPtr[1], srcPtr[0]);
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break;
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case 16:
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pixel = RGB(((((WORD*)srcPtr)[0]) >> 7) & 0xf8,
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((((WORD*)srcPtr)[0]) >> 2) & 0xf8,
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((((WORD*)srcPtr)[0]) << 3) & 0xf8);
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break;
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case 8:
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pixel = srcPtr[0];
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break;
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case 4:
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pixel = ((x%2) ? (*srcPtr) : ((*srcPtr) >> 4)) & 0x0f;
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break;
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case 1:
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pixel = ((*srcPtr) & (0x80 >> (x%8))) ? 1 : 0;
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break;
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}
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return pixel;
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}
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/*
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*----------------------------------------------------------------------
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*
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* PutPixel --
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*
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* Set a single pixel in an image.
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*
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* Results:
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* None.
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*
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* Side effects:
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* None.
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*
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*----------------------------------------------------------------------
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*/
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static int
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PutPixel(image, x, y, pixel)
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XImage *image;
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int x, y;
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unsigned long pixel;
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{
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unsigned char *destPtr = &(image->data[(y * image->bytes_per_line)
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+ ((x * image->bits_per_pixel) / NBBY)]);
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switch (image->bits_per_pixel) {
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case 32:
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/*
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* Pixel is DWORD: 0x00BBGGRR
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*/
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destPtr[3] = 0;
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case 24:
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/*
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* Pixel is triplet: 0xBBGGRR.
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*/
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destPtr[0] = (unsigned char) GetBValue(pixel);
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destPtr[1] = (unsigned char) GetGValue(pixel);
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destPtr[2] = (unsigned char) GetRValue(pixel);
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break;
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case 16:
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/*
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* Pixel is WORD: 5-5-5 (R-G-B)
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*/
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(*(WORD*)destPtr) =
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((GetRValue(pixel) & 0xf8) << 7)
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| ((GetGValue(pixel) & 0xf8) <<2)
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| ((GetBValue(pixel) & 0xf8) >> 3);
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break;
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case 8:
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/*
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* Pixel is 8-bit index into color table.
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*/
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(*destPtr) = (unsigned char) pixel;
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break;
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case 4:
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/*
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* Pixel is 4-bit index in MSBFirst order.
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*/
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if (x%2) {
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(*destPtr) = (unsigned char) (((*destPtr) & 0xf0)
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| (pixel & 0x0f));
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} else {
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(*destPtr) = (unsigned char) (((*destPtr) & 0x0f)
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| ((pixel << 4) & 0xf0));
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}
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break;
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case 1: {
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/*
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* Pixel is bit in MSBFirst order.
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*/
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int mask = (0x80 >> (x%8));
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if (pixel) {
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(*destPtr) |= mask;
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} else {
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(*destPtr) &= ~mask;
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}
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}
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break;
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}
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return 0;
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}
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/*
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*----------------------------------------------------------------------
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*
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* XCreateImage --
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*
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* Allocates storage for a new XImage.
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*
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* Results:
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* Returns a newly allocated XImage.
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*
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* Side effects:
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* None.
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*
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*----------------------------------------------------------------------
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*/
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XImage *
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XCreateImage(display, visual, depth, format, offset, data, width, height,
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bitmap_pad, bytes_per_line)
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Display* display;
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Visual* visual;
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unsigned int depth;
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int format;
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int offset;
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char* data;
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unsigned int width;
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unsigned int height;
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int bitmap_pad;
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int bytes_per_line;
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{
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XImage* imagePtr = (XImage *) ckalloc(sizeof(XImage));
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imagePtr->width = width;
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imagePtr->height = height;
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imagePtr->xoffset = offset;
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imagePtr->format = format;
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imagePtr->data = data;
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imagePtr->byte_order = LSBFirst;
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imagePtr->bitmap_unit = 8;
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imagePtr->bitmap_bit_order = MSBFirst;
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imagePtr->bitmap_pad = bitmap_pad;
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imagePtr->bits_per_pixel = depth;
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imagePtr->depth = depth;
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/*
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* Under Windows, bitmap_pad must be on an LONG data-type boundary.
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*/
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#define LONGBITS (sizeof(LONG) * 8)
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bitmap_pad = (bitmap_pad + LONGBITS - 1) / LONGBITS * LONGBITS;
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/*
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* Round to the nearest bitmap_pad boundary.
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*/
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if (bytes_per_line) {
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imagePtr->bytes_per_line = bytes_per_line;
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} else {
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imagePtr->bytes_per_line = (((depth * width)
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+ (bitmap_pad - 1)) >> 3) & ~((bitmap_pad >> 3) - 1);
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}
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imagePtr->red_mask = 0;
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imagePtr->green_mask = 0;
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imagePtr->blue_mask = 0;
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imagePtr->f.put_pixel = PutPixel;
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imagePtr->f.get_pixel = ImageGetPixel;
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imagePtr->f.destroy_image = DestroyImage;
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imagePtr->f.create_image = NULL;
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imagePtr->f.sub_image = NULL;
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imagePtr->f.add_pixel = NULL;
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return imagePtr;
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}
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/*
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*----------------------------------------------------------------------
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*
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* XGetImage --
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*
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* This function copies data from a pixmap or window into an
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* XImage.
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*
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* Results:
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* Returns a newly allocated image containing the data from the
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* given rectangle of the given drawable.
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*
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* Side effects:
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* None.
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*
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*----------------------------------------------------------------------
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*/
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XImage *
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XGetImage(display, d, x, y, width, height, plane_mask, format)
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Display* display;
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Drawable d;
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int x;
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int y;
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unsigned int width;
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unsigned int height;
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unsigned long plane_mask;
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int format;
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{
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TkWinDrawable *twdPtr = (TkWinDrawable *)d;
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XImage *imagePtr;
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HDC dc;
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char infoBuf[sizeof(BITMAPINFO) + sizeof(RGBQUAD)];
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BITMAPINFO *infoPtr = (BITMAPINFO*)infoBuf;
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if ((twdPtr->type != TWD_BITMAP) || (twdPtr->bitmap.handle == NULL)
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|| (format != XYPixmap) || (plane_mask != 1)) {
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panic("XGetImage: not implemented");
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}
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imagePtr = XCreateImage(display, NULL, 1, XYBitmap, 0, NULL,
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width, height, 32, 0);
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imagePtr->data = ckalloc(imagePtr->bytes_per_line * imagePtr->height);
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dc = GetDC(NULL);
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GetDIBits(dc, twdPtr->bitmap.handle, 0, height, NULL,
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infoPtr, DIB_RGB_COLORS);
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infoPtr->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
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infoPtr->bmiHeader.biWidth = width;
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infoPtr->bmiHeader.biHeight = -(LONG)height;
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infoPtr->bmiHeader.biPlanes = 1;
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infoPtr->bmiHeader.biBitCount = 1;
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infoPtr->bmiHeader.biCompression = BI_RGB;
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infoPtr->bmiHeader.biCompression = 0;
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infoPtr->bmiHeader.biXPelsPerMeter = 0;
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infoPtr->bmiHeader.biYPelsPerMeter = 0;
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infoPtr->bmiHeader.biClrUsed = 0;
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infoPtr->bmiHeader.biClrImportant = 0;
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GetDIBits(dc, twdPtr->bitmap.handle, 0, height, imagePtr->data,
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infoPtr, DIB_RGB_COLORS);
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ReleaseDC(NULL, dc);
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return imagePtr;
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}
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