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1051 lines
23 KiB
1051 lines
23 KiB
/*
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* StretchC.C
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*
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* StretchBlt for DIBs
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*
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* C version of stretch.asm: StretchDIB optimised for AVI.
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*
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* NOTES
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* - does not handle mirroring in x or y
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* - does not handle pixel translation
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* - will not work in place.
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*
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* AUTHOR
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* C version by Geraint Davies
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*/
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#include <windows.h>
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#include "drawdibi.h"
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#include "stretch.h"
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/* Outline:
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*
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* we select a y-stretching function depending on the ratio (eg 1:N or N:1).
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* it copies scanlines from source to destination, duplicating or omitting
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* scanlines as necessary to fit the destination. It copies each scanline
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* via the X_FUNC function we passed as an argument: this copies one scanline
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* duplicating or omitting pixels to fit the destination: we select an X_FUNC
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* depending on the bit-depth as well as the x-stretching ratio.
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*
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* both x and y stretching functions use the following basic model for deciding
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* when to insert/omit elements:
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*
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* delta = <larger extent> -1;
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*
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* for (number of destination elements) {
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*
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* copy one element
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* advance pointer to larger region
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* delta -= <smaller extent>
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* if (delta < 0) {
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* delta += <larger extent>;
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* advance pointer to smaller region
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* }
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* }
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*/
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/* stretch proportions */
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#define STRETCH_1_1 1
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#define STRETCH_1_2 2
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#define STRETCH_1_4 3
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#define STRETCH_1_N 4
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#define STRETCH_N_1 5
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#define STRETCH_4_1 6
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#define STRETCH_2_1 7
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/*
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* an X_FUNC is a function that copies one scanline, stretching or shrinking it
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* to fit a destination scanline. Pick an X_FUNC depending on
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* bitdepth and stretch ratio (1:1, 1:2, 1:4, 1:N, N:1, 4:1, 2:1)
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*
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* the x_fract argument is the delta fraction: it is a representation
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* of the smaller extent (whichever that is) as a fraction of the larger,
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* and is used when stretching or shrinking to advance the pointer to the
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* smaller scanline every (fract) pixels of the larger.
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* Thus if we are expanding 1:8, x_fract will be 1/8, we will advance the
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* source pointer once every 8 pixels, and thus copy each source pixel to
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* 8 dest pixels. Note that if shrinking 8:1, x_fract will still be 1/8
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* and we will use it to control advancement of the dest pointer.
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* the fraction is multiplied by 65536.
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*/
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typedef void (*X_FUNC) (LPBYTE lpSrc,
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LPBYTE lpDst,
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int SrcXE,
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int DstXE,
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int x_fract);
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void X_Stretch_1_1_8Bits(LPBYTE lpSrc, LPBYTE lpDst, int SrcXE, int DstXE, int x_fract);
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void X_Stretch_1_2_8Bits(LPBYTE lpSrc, LPBYTE lpDst, int SrcXE, int DstXE, int x_fract);
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void X_Stretch_1_4_8Bits(LPBYTE lpSrc, LPBYTE lpDst, int SrcXE, int DstXE, int x_fract);
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void X_Stretch_1_N_8Bits(LPBYTE lpSrc, LPBYTE lpDst, int SrcXE, int DstXE, int x_fract);
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void X_Stretch_N_1_8Bits(LPBYTE lpSrc, LPBYTE lpDst, int SrcXE, int DstXE, int x_fract);
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void X_Stretch_1_1_16Bits(LPBYTE lpSrc, LPBYTE lpDst, int SrcXE, int DstXE, int x_fract);
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void X_Stretch_1_2_16Bits(LPBYTE lpSrc, LPBYTE lpDst, int SrcXE, int DstXE, int x_fract);
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void X_Stretch_1_N_16Bits(LPBYTE lpSrc, LPBYTE lpDst, int SrcXE, int DstXE, int x_fract);
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void X_Stretch_N_1_16Bits(LPBYTE lpSrc, LPBYTE lpDst, int SrcXE, int DstXE, int x_fract);
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void X_Stretch_1_1_24Bits(LPBYTE lpSrc, LPBYTE lpDst, int SrcXE, int DstXE, int x_fract);
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void X_Stretch_1_N_24Bits(LPBYTE lpSrc, LPBYTE lpDst, int SrcXE, int DstXE, int x_fract);
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void X_Stretch_N_1_24Bits(LPBYTE lpSrc, LPBYTE lpDst, int SrcXE, int DstXE, int x_fract);
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/*
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* Y_Stretch_* functions copy DstYE scanlines (using
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* an X_FUNC to copy each scanline) omitting or duplicating scanlines to
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* fit the destination extent. Pick a Y_ depending on the ratio
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* (1:N, N:1...)
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*/
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void Y_Stretch_1_N(LPBYTE lpSrc, LPBYTE lpDst, int SrcXE,int SrcYE, int DstXE,
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int DstYE, int SrcWidth, int DstWidth, int x_fract,
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X_FUNC x_func);
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void Y_Stretch_N_1(LPBYTE lpSrc, LPBYTE lpDst, int SrcXE,int SrcYE, int DstXE,
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int DstYE, int SrcWidth, int DstWidth, int x_fract,
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X_FUNC x_func);
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/*
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* special case y-stretch functions for 1:2 in both dimensions for 8 and 16 bits
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* takes no X_FUNC arg. Will do entire stretch.
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*/
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void Stretch_1_2_8Bits(LPBYTE lpSrc, LPBYTE lpDst, int SrcXE,int SrcYE, int DstXE,
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int DstYE, int SrcWidth, int DstWidth, int x_fract);
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void Stretch_1_2_16Bits(LPBYTE lpSrc, LPBYTE lpDst, int SrcXE,int SrcYE, int DstXE,
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int DstYE, int SrcWidth, int DstWidth, int x_fract);
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/* straight copy of one scanline of count bytes */
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void X_CopyScanline(LPBYTE lpSrc, LPBYTE lpDst, int count);
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/* -------------------------------------------------------------------- */
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/*
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* StretchFactor
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*
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* calculate the stretch factor (proportion of source extent to destination
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* extent: 1:1, 1:2, 1:4, 1:N, N:1, 4:1,or 2:1) and also the
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* delta fraction (see above comment on X_FUNC). This is the ratio of
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* the smaller extent to the larger extent, represented as a fraction
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* multiplied by 65536.
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*
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* returns: the stretch factor (stores the delta fraction in *pfract)
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*/
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int
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StretchFactor(int SrcE, int DstE, int *pfract)
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{
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if (SrcE == DstE) {
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if (pfract != NULL) {
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pfract = 0;
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}
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return(STRETCH_1_1);
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}
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if (SrcE > DstE) {
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if (pfract != NULL) {
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*pfract = ( (DstE << 16) / SrcE) & 0xffff;
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}
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if (SrcE == (DstE * 2)) {
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return(STRETCH_2_1);
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} else if (SrcE == (DstE * 4)) {
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return(STRETCH_4_1);
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} else {
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return(STRETCH_N_1);
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}
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} else {
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/* calculate delta fraction based on smallest / largest */
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if (pfract != NULL) {
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*pfract = ( (SrcE << 16) / DstE) & 0xffff;
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}
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if (DstE == (SrcE * 2)) {
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return(STRETCH_1_2);
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} else if (DstE == (SrcE * 4)) {
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return(STRETCH_1_4);
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} else {
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return(STRETCH_1_N);
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}
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}
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}
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/* -------------------------------------------------------------------- */
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/*
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* StretchDIB
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*
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*/
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void FAR PASCAL
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StretchDIB(
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LPBITMAPINFOHEADER biDst, // --> BITMAPINFO of destination
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LPVOID lpvDst, // --> to destination bits
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int DstX, // Destination origin - x coordinate
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int DstY, // Destination origin - y coordinate
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int DstXE, // x extent of the BLT
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int DstYE, // y extent of the BLT
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LPBITMAPINFOHEADER biSrc, // --> BITMAPINFO of source
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LPVOID lpvSrc, // --> to source bits
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int SrcX, // Source origin - x coordinate
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int SrcY, // Source origin - y coordinate
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int SrcXE, // x extent of the BLT
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int SrcYE // y extent of the BLT
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)
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{
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int nBits;
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int SrcWidth, DstWidth;
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LPBYTE lpDst = lpvDst, lpSrc = lpvSrc;
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int x_fract;
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int x_factor;
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int y_factor;
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X_FUNC xfunc;
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/*
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* check that bit depths are same and 8, 16 or 24
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*/
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if ((nBits = biDst->biBitCount) != biSrc->biBitCount) {
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return;
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}
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if ( (nBits != 8 ) && (nBits != 16) && (nBits != 24)) {
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return;
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}
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/*
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* check that extents are not bad
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*/
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if ( (SrcXE <= 0) || (SrcYE <= 0) || (DstXE <= 0) || (DstYE <= 0)) {
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return;
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}
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/*
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* calculate width of one scan line in bytes, rounded up to
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* DWORD boundary.
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*/
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SrcWidth = (((biSrc->biWidth * nBits) + 31) & ~31) / 8;
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DstWidth = (((biDst->biWidth * nBits) + 31) & ~31) / 8;
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/*
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* set initial source and dest pointers
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*/
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lpSrc += (SrcY * SrcWidth) + ((SrcX * nBits) / 8);
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lpDst += (DstY * DstWidth) + ((DstX * nBits) / 8);
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/*
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* calculate stretch proportions (1:1, 1:2, 1:N, N:1 etc) and
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* also the fractional stretch factor. (we are not interested in
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* the y stretch fraction - this is only used in x stretching.
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*/
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y_factor = StretchFactor(SrcYE, DstYE, NULL);
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x_factor = StretchFactor(SrcXE, DstXE, &x_fract);
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/*
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* we have special case routines for 1:2 in both dimensions
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* for 8 and 16 bits
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*/
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if ((y_factor == x_factor) && (y_factor == STRETCH_1_2)) {
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if (nBits == 8) {
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StartCounting();
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Stretch_1_2_8Bits(lpSrc, lpDst, SrcXE, SrcYE,
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DstXE, DstYE, SrcWidth, DstWidth,
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x_fract);
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EndCounting("8 bit");
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return;
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} else if (nBits == 16) {
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StartCounting();
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Stretch_1_2_16Bits(lpSrc, lpDst, SrcXE, SrcYE,
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DstXE, DstYE, SrcWidth, DstWidth,
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x_fract);
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EndCounting("16 bit");
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return;
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}
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}
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/* pick an X stretch function */
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switch(nBits) {
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case 8:
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switch(x_factor) {
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case STRETCH_1_1:
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xfunc = X_Stretch_1_1_8Bits;
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break;
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case STRETCH_1_2:
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xfunc = X_Stretch_1_2_8Bits;
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break;
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case STRETCH_1_4:
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xfunc = X_Stretch_1_4_8Bits;
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break;
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case STRETCH_1_N:
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xfunc = X_Stretch_1_N_8Bits;
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break;
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case STRETCH_N_1:
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case STRETCH_4_1:
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case STRETCH_2_1:
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xfunc = X_Stretch_N_1_8Bits;
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break;
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}
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break;
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case 16:
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switch(x_factor) {
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case STRETCH_1_1:
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xfunc = X_Stretch_1_1_16Bits;
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break;
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case STRETCH_1_2:
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xfunc = X_Stretch_1_2_16Bits;
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break;
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case STRETCH_1_4:
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case STRETCH_1_N:
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xfunc = X_Stretch_1_N_16Bits;
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break;
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case STRETCH_N_1:
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case STRETCH_4_1:
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case STRETCH_2_1:
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xfunc = X_Stretch_N_1_16Bits;
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break;
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}
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break;
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case 24:
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switch(x_factor) {
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case STRETCH_1_1:
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xfunc = X_Stretch_1_1_24Bits;
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break;
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case STRETCH_1_2:
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case STRETCH_1_4:
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case STRETCH_1_N:
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xfunc = X_Stretch_1_N_24Bits;
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break;
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case STRETCH_N_1:
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case STRETCH_4_1:
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case STRETCH_2_1:
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xfunc = X_Stretch_N_1_24Bits;
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break;
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}
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break;
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}
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/*
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* now call appropriate stretching function depending
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* on the y stretch factor
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*/
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switch (y_factor) {
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case STRETCH_1_1:
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case STRETCH_1_2:
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case STRETCH_1_4:
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case STRETCH_1_N:
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Y_Stretch_1_N(lpSrc, lpDst, SrcXE, SrcYE,
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DstXE, DstYE, SrcWidth, DstWidth, x_fract, xfunc);
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break;
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case STRETCH_N_1:
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case STRETCH_4_1:
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case STRETCH_2_1:
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Y_Stretch_N_1(lpSrc, lpDst, SrcXE, SrcYE,
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DstXE, DstYE, SrcWidth, DstWidth, x_fract, xfunc);
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break;
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}
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return;
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}
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/* ---- y stretching -------------------------------------------- */
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/*
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* call an X_FUNC to copy scanlines from lpSrc to lpDst. Duplicate or
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* omit scanlines to stretch SrcYE to DstYE.
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*/
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/*
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* Y_Stretch_1_N
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*
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* write DstYE scanlines based on SrcYE scanlines, DstYE > SrcYE
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*
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*/
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void
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Y_Stretch_1_N(LPBYTE lpSrc,
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LPBYTE lpDst,
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int SrcXE,
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int SrcYE,
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int DstXE,
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int DstYE,
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int SrcWidth,
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int DstWidth,
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int x_fract,
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X_FUNC x_func)
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{
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int ydelta;
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int i;
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LPBYTE lpPrev = NULL;
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ydelta = DstYE -1;
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for (i = 0; i < DstYE; i++) {
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/* have we already stretched this scanline ? */
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if (lpPrev == NULL) {
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/* no - copy one scanline */
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(*x_func)(lpSrc, lpDst, SrcXE, DstXE, x_fract);
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lpPrev = lpDst;
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} else {
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/* yes - this is a duplicate scanline. do
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* a straight copy of one that has already
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* been stretched/shrunk
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*/
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X_CopyScanline(lpPrev, lpDst, DstWidth);
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}
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/* advance dest pointer */
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lpDst += DstWidth;
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/* should we advance source pointer this time ? */
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if ( (ydelta -= SrcYE) < 0) {
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ydelta += DstYE;
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lpSrc += SrcWidth;
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lpPrev = NULL;
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}
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}
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}
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|
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/*
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* Y_Stretch_N_1
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*
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* write DstYE scanlines based on SrcYE scanlines, DstYE < SrcYE
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*
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*/
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void
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Y_Stretch_N_1(LPBYTE lpSrc,
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LPBYTE lpDst,
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int SrcXE,
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int SrcYE,
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int DstXE,
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int DstYE,
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int SrcWidth,
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int DstWidth,
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int x_fract,
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X_FUNC x_func)
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{
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int ydelta;
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int i;
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ydelta = SrcYE -1;
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for (i = 0; i < DstYE; i++) {
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/* copy one scanline */
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(*x_func)(lpSrc, lpDst, SrcXE, DstXE, x_fract);
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/* advance dest pointer */
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lpDst += DstWidth;
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/* how many times do we advance source pointer this time ? */
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do {
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lpSrc += SrcWidth;
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ydelta -= DstYE;
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} while (ydelta >= 0);
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ydelta += SrcYE;
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}
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}
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/* ---8-bit X stretching -------------------------------------------------- */
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/*
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* X_Stretch_1_N_8Bits
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*
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* copy one scan line, stretching 1:N (DstXE > SrcXE). For 8-bit depth.
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*/
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void
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X_Stretch_1_N_8Bits(LPBYTE lpSrc,
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LPBYTE lpDst,
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int SrcXE,
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int DstXE,
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int x_fract)
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{
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int xdelta;
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int i;
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xdelta = DstXE -1;
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for (i = 0; i < DstXE; i++) {
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/* copy one byte and advance dest */
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*lpDst++ = *lpSrc;
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|
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/* should we advance source pointer this time ? */
|
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if ( (xdelta -= SrcXE) < 0) {
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xdelta += DstXE;
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lpSrc++;
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}
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}
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}
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|
|
|
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/*
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* X_Stretch_N_1_8Bits
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*
|
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* copy one scan line, shrinking N:1 (DstXE < SrcXE). For 8-bit depth.
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*/
|
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void
|
|
X_Stretch_N_1_8Bits(LPBYTE lpSrc,
|
|
LPBYTE lpDst,
|
|
int SrcXE,
|
|
int DstXE,
|
|
int x_fract)
|
|
{
|
|
int xdelta;
|
|
int i;
|
|
|
|
xdelta = SrcXE -1;
|
|
|
|
for (i = 0; i < DstXE; i++) {
|
|
|
|
/* copy one byte and advance dest */
|
|
*lpDst++ = *lpSrc;
|
|
|
|
/* how many times do we advance source pointer this time ? */
|
|
do {
|
|
lpSrc++;
|
|
xdelta -= DstXE;
|
|
} while (xdelta >= 0);
|
|
|
|
xdelta += SrcXE;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* copy one scanline of count bytes from lpSrc to lpDst. used by 1:1
|
|
* scanline functions for all bit depths
|
|
*/
|
|
void
|
|
X_CopyScanline(LPBYTE lpSrc, LPBYTE lpDst, int count)
|
|
{
|
|
int i;
|
|
|
|
/*
|
|
* if the alignment of lpSrc and lpDst is the same, then
|
|
* we can get them aligned and do a faster copy
|
|
*/
|
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if (((DWORD) lpSrc & 0x3) == ( (DWORD) lpDst & 0x3)) {
|
|
|
|
/* align on WORD boundary */
|
|
if ( (DWORD) lpSrc & 0x1) {
|
|
*lpDst++ = *lpSrc++;
|
|
count--;
|
|
}
|
|
|
|
/* align on DWORD boundary */
|
|
if ((DWORD) lpSrc & 0x2) {
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|
* ((LPWORD) lpDst) = *((LPWORD) lpSrc);
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|
lpDst += sizeof(WORD);
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lpSrc += sizeof(WORD);
|
|
count -= sizeof(WORD);
|
|
}
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|
|
|
/* copy whole DWORDS */
|
|
for ( i = (count / 4); i > 0; i--) {
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*((LPDWORD) lpDst) = *((LPDWORD) lpSrc);
|
|
lpSrc += sizeof(DWORD);
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|
lpDst += sizeof(DWORD);
|
|
}
|
|
} else {
|
|
/* the lpSrc and lpDst pointers are different
|
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* alignment, so leave them unaligned and
|
|
* copy all the whole DWORDs
|
|
*/
|
|
for (i = (count / 4); i> 0; i--) {
|
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*( (DWORD UNALIGNED FAR *) lpDst) =
|
|
*((DWORD UNALIGNED FAR *) lpSrc);
|
|
lpSrc += sizeof(DWORD);
|
|
lpDst += sizeof(DWORD);
|
|
}
|
|
}
|
|
|
|
/* in either case, copy last (up to 3) bytes. */
|
|
for ( i = count % 4; i > 0; i--) {
|
|
*lpDst++ = *lpSrc++;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* X_Stretch_1_1_8Bits
|
|
*
|
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* copy a scanline with no change (1:1)
|
|
*/
|
|
void
|
|
X_Stretch_1_1_8Bits(LPBYTE lpSrc,
|
|
LPBYTE lpDst,
|
|
int SrcXE,
|
|
int DstXE,
|
|
int x_fract)
|
|
{
|
|
|
|
X_CopyScanline(lpSrc, lpDst, DstXE);
|
|
}
|
|
|
|
|
|
/*
|
|
* X_Stretch_1_2_8Bits
|
|
*
|
|
* copy a scanline, doubling all the pixels (1:2)
|
|
*/
|
|
void
|
|
X_Stretch_1_2_8Bits(LPBYTE lpSrc,
|
|
LPBYTE lpDst,
|
|
int SrcXE,
|
|
int DstXE,
|
|
int x_fract)
|
|
{
|
|
WORD wPix;
|
|
int i;
|
|
|
|
for (i = 0; i < SrcXE; i++) {
|
|
|
|
/* get a pixel and double it */
|
|
wPix = *lpSrc++;
|
|
wPix |= (wPix << 8);
|
|
* ((WORD UNALIGNED *) lpDst) = wPix;
|
|
lpDst += sizeof(WORD);
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* X_Stretch_1_4_8Bits
|
|
*
|
|
* copy a scanline, quadrupling all the pixels (1:4)
|
|
*/
|
|
void
|
|
X_Stretch_1_4_8Bits(LPBYTE lpSrc,
|
|
LPBYTE lpDst,
|
|
int SrcXE,
|
|
int DstXE,
|
|
int x_fract)
|
|
{
|
|
DWORD dwPix;
|
|
int i;
|
|
|
|
for (i = 0; i < SrcXE; i++) {
|
|
|
|
/* get a pixel and make four copies of it */
|
|
dwPix = *lpSrc++;
|
|
dwPix |= (dwPix <<8);
|
|
dwPix |= (dwPix << 16);
|
|
* ((DWORD UNALIGNED *) lpDst) = dwPix;
|
|
lpDst += sizeof(DWORD);
|
|
}
|
|
}
|
|
|
|
|
|
/* -- 16-bit X functions -----------------------------------------------*/
|
|
|
|
/*
|
|
* copy one scan-line of 16 bits with no change (1:1)
|
|
*/
|
|
void
|
|
X_Stretch_1_1_16Bits(LPBYTE lpSrc,
|
|
LPBYTE lpDst,
|
|
int SrcXE,
|
|
int DstXE,
|
|
int x_fract)
|
|
{
|
|
|
|
X_CopyScanline(lpSrc, lpDst, DstXE * sizeof(WORD));
|
|
|
|
}
|
|
|
|
|
|
/*
|
|
* copy one scanline of 16 bpp duplicating each pixel
|
|
*/
|
|
void
|
|
X_Stretch_1_2_16Bits(LPBYTE lpSrc,
|
|
LPBYTE lpDst,
|
|
int SrcXE,
|
|
int DstXE,
|
|
int x_fract)
|
|
{
|
|
|
|
DWORD dwPix;
|
|
int i;
|
|
|
|
for (i = 0; i < SrcXE; i++) {
|
|
|
|
/* get a pixel and double it */
|
|
dwPix = * ((WORD *)lpSrc);
|
|
dwPix |= (dwPix << 16);
|
|
* ((DWORD UNALIGNED *) lpDst) = dwPix;
|
|
|
|
lpDst += sizeof(DWORD);
|
|
lpSrc += sizeof(WORD);
|
|
}
|
|
|
|
}
|
|
|
|
/*
|
|
* copy one scanline of 16 bits, stretching 1:n (dest > source)
|
|
*/
|
|
void
|
|
X_Stretch_1_N_16Bits(LPBYTE lpSrc,
|
|
LPBYTE lpDst,
|
|
int SrcXE,
|
|
int DstXE,
|
|
int x_fract)
|
|
{
|
|
int xdelta;
|
|
int i;
|
|
|
|
xdelta = DstXE -1;
|
|
|
|
for (i = 0; i < DstXE; i++) {
|
|
|
|
/* copy one pixel and advance dest */
|
|
*((WORD *) lpDst) = *((WORD *) lpSrc);
|
|
|
|
lpDst += sizeof(WORD);
|
|
|
|
/* should we advance source pointer this time ? */
|
|
if ( (xdelta -= SrcXE) < 0) {
|
|
xdelta += DstXE;
|
|
lpSrc += sizeof(WORD);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* copy one scanline of 16bits, shrinking n:1 (dest < source)
|
|
*/
|
|
void
|
|
X_Stretch_N_1_16Bits(LPBYTE lpSrc,
|
|
LPBYTE lpDst,
|
|
int SrcXE,
|
|
int DstXE,
|
|
int x_fract)
|
|
{
|
|
|
|
int xdelta;
|
|
int i;
|
|
|
|
xdelta = SrcXE -1;
|
|
|
|
for (i = 0; i < DstXE; i++) {
|
|
|
|
/* copy one pixel and advance dest */
|
|
*((WORD *) lpDst) = *((WORD *)lpSrc);
|
|
|
|
lpDst += sizeof(WORD);
|
|
|
|
/* how many times do we advance source pointer this time ? */
|
|
do {
|
|
lpSrc += sizeof(WORD);
|
|
xdelta -= DstXE;
|
|
} while (xdelta >= 0);
|
|
|
|
xdelta += SrcXE;
|
|
}
|
|
|
|
}
|
|
|
|
|
|
/* 24-bits ---------------------------------------------------------*/
|
|
|
|
/*
|
|
* copy one 24-bpp scanline as is (1:1)
|
|
*/
|
|
void
|
|
X_Stretch_1_1_24Bits(LPBYTE lpSrc,
|
|
LPBYTE lpDst,
|
|
int SrcXE,
|
|
int DstXE,
|
|
int x_fract)
|
|
{
|
|
X_CopyScanline(lpSrc, lpDst, DstXE * 3);
|
|
}
|
|
|
|
/*
|
|
* copy one 24-bpp scanline stretching 1:n (dest > source)
|
|
*/
|
|
void
|
|
X_Stretch_1_N_24Bits(LPBYTE lpSrc,
|
|
LPBYTE lpDst,
|
|
int SrcXE,
|
|
int DstXE,
|
|
int x_fract)
|
|
{
|
|
|
|
int xdelta;
|
|
int i;
|
|
|
|
xdelta = DstXE -1;
|
|
|
|
for (i = 0; i < DstXE; i++) {
|
|
/* copy first word of pixel and advance dest */
|
|
*((WORD UNALIGNED *) lpDst) = *((WORD UNALIGNED *) lpSrc);
|
|
|
|
lpDst += sizeof(WORD);
|
|
|
|
/* copy third byte and advance dest */
|
|
*lpDst++ = lpSrc[sizeof(WORD)];
|
|
|
|
/* should we advance source pointer this time ? */
|
|
if ( (xdelta -= SrcXE) < 0) {
|
|
xdelta += DstXE;
|
|
lpSrc += 3;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* copy one scanline of 24 bits, shrinking n:1 (dest < source)
|
|
*/
|
|
void
|
|
X_Stretch_N_1_24Bits(LPBYTE lpSrc,
|
|
LPBYTE lpDst,
|
|
int SrcXE,
|
|
int DstXE,
|
|
int x_fract)
|
|
{
|
|
int xdelta;
|
|
int i;
|
|
|
|
xdelta = SrcXE -1;
|
|
|
|
for (i = 0; i < DstXE; i++) {
|
|
|
|
/* copy first word of pixel and advance dest */
|
|
*((WORD UNALIGNED *) lpDst) = *((WORD UNALIGNED *) lpSrc);
|
|
|
|
lpDst += sizeof(WORD);
|
|
|
|
/* copy third byte and advance dest */
|
|
*lpDst++ = lpSrc[sizeof(WORD)];
|
|
|
|
|
|
/* how many times do we advance source pointer this time ? */
|
|
do {
|
|
lpSrc += 3;
|
|
xdelta -= DstXE;
|
|
} while (xdelta >= 0);
|
|
|
|
xdelta += SrcXE;
|
|
}
|
|
}
|
|
|
|
/* -- special-case 1:2 -------------------------------------------*/
|
|
|
|
/*
|
|
* stretch 1:2 in both directions, for 8 bits.
|
|
*
|
|
* An experiment was done on x86 to only write every other line during
|
|
* the stretch and when the whole frame was done to use memcpy to fill
|
|
* in the gaps. This is slower than doing the stretch in a single pass.
|
|
*/
|
|
void
|
|
Stretch_1_2_8Bits(LPBYTE lpSrc, LPBYTE lpDst, int SrcXE,int SrcYE, int DstXE,
|
|
int DstYE, int SrcWidth, int DstWidth, int x_fract)
|
|
{
|
|
|
|
int SrcInc, DstInc;
|
|
int i, j;
|
|
WORD wPix;
|
|
DWORD dwPix4;
|
|
|
|
/* amount to advance source by at the end of each scan */
|
|
SrcInc = SrcWidth - SrcXE;
|
|
|
|
|
|
/* amount to advance dest by at the end of each scan - note
|
|
* that we write two scans at once, so advance past the next
|
|
* scan line
|
|
*/
|
|
DstInc = (DstWidth * 2) - DstXE;
|
|
|
|
/*
|
|
* we would like to copy the pixels DWORD at a time. this means
|
|
* being aligned. if we are currently aligned on a WORD boundary,
|
|
* then copy one pixel to get aligned. If we are on a byte
|
|
* boundary, we can never get aligned, so use the slower loop.
|
|
*/
|
|
if ( ((DWORD)lpDst) & 1) {
|
|
|
|
/*
|
|
* dest is byte aligned - so we can never align it
|
|
* by writing WORDs - use slow loop.
|
|
*/
|
|
for (i = 0; i < SrcYE; i++) {
|
|
|
|
for (j = 0; j < SrcXE; j++) {
|
|
|
|
/* get a pixel and double it */
|
|
|
|
wPix = *lpSrc++;
|
|
wPix |= (wPix<<8);
|
|
|
|
|
|
/* write doubled pixel to this scanline */
|
|
|
|
*( (WORD UNALIGNED *) lpDst) = wPix;
|
|
|
|
/* write double pixel to next scanline */
|
|
*( (WORD UNALIGNED *) (lpDst + DstWidth)) = wPix;
|
|
|
|
lpDst += sizeof(WORD);
|
|
}
|
|
lpSrc += SrcInc;
|
|
lpDst += DstInc;
|
|
}
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* this will be the aligned version. align each scan line
|
|
*/
|
|
for ( i = 0; i < SrcYE; i++) {
|
|
|
|
/* count of pixels remaining */
|
|
j = SrcXE;
|
|
|
|
/* align this scan line */
|
|
if (((DWORD)lpDst) & 2) {
|
|
|
|
/* word aligned - copy one doubled pixel and we are ok */
|
|
wPix = *lpSrc++;
|
|
wPix |= (wPix << 8);
|
|
|
|
*( (WORD *) lpDst) = wPix;
|
|
*( (WORD *) (lpDst + DstWidth)) = wPix;
|
|
lpDst += sizeof(WORD);
|
|
|
|
j -= 1;
|
|
}
|
|
|
|
|
|
/* now dest is aligned - so loop eating two pixels at a time
|
|
* until there is at most one left
|
|
*/
|
|
for ( ; j > 1; j -= 2) {
|
|
|
|
/* read two pixels and double them */
|
|
wPix = * ((WORD UNALIGNED *) lpSrc);
|
|
lpSrc += sizeof(WORD);
|
|
|
|
dwPix4 = (wPix & 0xff) | ((wPix & 0xff) << 8);
|
|
dwPix4 |= ((wPix & 0xff00) << 8) | ((wPix & 0xff00) << 16);
|
|
*((DWORD *) lpDst) = dwPix4;
|
|
*((DWORD *) (lpDst + DstWidth)) = dwPix4;
|
|
|
|
lpDst += sizeof(DWORD);
|
|
}
|
|
|
|
/* odd byte remaining ? */
|
|
if (j > 0) {
|
|
/* word aligned - copy one doubled pixel and we are ok */
|
|
wPix = *lpSrc++;
|
|
wPix |= (wPix << 8);
|
|
|
|
*( (WORD *) lpDst) = wPix;
|
|
*( (WORD *) (lpDst + DstWidth)) = wPix;
|
|
lpDst += sizeof(WORD);
|
|
|
|
j -= 1;
|
|
}
|
|
lpSrc += SrcInc;
|
|
lpDst += DstInc;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
/* ----------------------------------------------------------------*/
|
|
|
|
/*
|
|
* stretch 1:2 in both directions, for 16-bits
|
|
*/
|
|
|
|
void
|
|
Stretch_1_2_16Bits(LPBYTE lpSrc, LPBYTE lpDst, int SrcXE,int SrcYE, int DstXE,
|
|
int DstYE, int SrcWidth, int DstWidth, int x_fract)
|
|
|
|
{
|
|
int SrcInc, DstInc;
|
|
int i, j;
|
|
DWORD dwPix;
|
|
|
|
/* amount to advance source by at the end of each scan */
|
|
SrcInc = SrcWidth - (SrcXE * sizeof(WORD));
|
|
|
|
|
|
/* amount to advance dest by at the end of each scan - note
|
|
* that we write two scans at once, so advance past the next
|
|
* scan line
|
|
*/
|
|
DstInc = (DstWidth * 2) - (DstXE * sizeof(WORD));
|
|
|
|
for (i = 0; i < SrcYE; i++) {
|
|
|
|
for (j = 0; j < SrcXE; j++) {
|
|
|
|
/* get a pixel and double it */
|
|
|
|
dwPix = *((WORD *)lpSrc);
|
|
dwPix |= (dwPix<<16);
|
|
|
|
lpSrc += sizeof(WORD);
|
|
|
|
/* write doubled pixel to this scanline */
|
|
|
|
*( (DWORD UNALIGNED *) lpDst) = dwPix;
|
|
|
|
/* write double pixel to next scanline */
|
|
*( (DWORD UNALIGNED *) (lpDst + DstWidth)) = dwPix;
|
|
|
|
lpDst += sizeof(DWORD);
|
|
}
|
|
lpSrc += SrcInc;
|
|
lpDst += DstInc;
|
|
|
|
}
|
|
}
|