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Diffstat (limited to 'tinyDSHOW/include/tinydshow/Resizer.h')
| -rw-r--r-- | tinyDSHOW/include/tinydshow/Resizer.h | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/tinyDSHOW/include/tinydshow/Resizer.h b/tinyDSHOW/include/tinydshow/Resizer.h new file mode 100644 index 0000000..d5ef36e --- /dev/null +++ b/tinyDSHOW/include/tinydshow/Resizer.h @@ -0,0 +1,174 @@ +/*
+* Copyright (C) 2009-2010 Mamadou Diop.
+*
+* Contact: Mamadou Diop <diopmamadou(at)doubango.org>
+*
+* This file is part of Open Source Doubango Framework.
+*
+* DOUBANGO is free software: you can redistribute it and/or modify
+* it under the terms of the GNU General Public License as published by
+* the Free Software Foundation, either version 3 of the License, or
+* (at your option) any later version.
+*
+* DOUBANGO is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+* GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with DOUBANGO.
+*
+*/
+/*
+ * Copyright (c) Microsoft Corporation. All rights reserved.
+ */
+#ifndef RESIZER_H
+#define RESIZER_H
+
+#include <tinydshow_config.h>
+
+/*
+* StretchC.C
+*
+* StretchBlt for DIBs
+*
+* C version of stretch.asm: StretchDIB optimised for AVI.
+*
+* NOTES
+* - does not handle mirroring in x or y
+* - does not handle pixel translation
+* - will not work in place.
+*/
+
+
+/* Outline:
+*
+* we select a y-stretching function depending on the ratio (eg 1:N or N:1).
+* it copies scanlines from source to destination, duplicating or omitting
+* scanlines as necessary to fit the destination. It copies each scanline
+* via the X_FUNC function we passed as an argument: this copies one scanline
+* duplicating or omitting pixels to fit the destination: we select an X_FUNC
+* depending on the bit-depth as well as the x-stretching ratio.
+*
+* both x and y stretching functions use the following basic model for deciding
+* when to insert/omit elements:
+*
+* delta = <larger extent> -1;
+*
+* for (number of destination elements) {
+*
+* copy one element
+* advance pointer to larger region
+* delta -= <smaller extent>
+* if (delta < 0) {
+* delta += <larger extent>;
+* advance pointer to smaller region
+* }
+* }
+*/
+
+#include <streams.h>
+
+/* stretch proportions */
+#define STRETCH_1_1 1
+#define STRETCH_1_2 2
+#define STRETCH_1_4 3
+#define STRETCH_1_N 4
+#define STRETCH_N_1 5
+#define STRETCH_4_1 6
+#define STRETCH_2_1 7
+
+void __stdcall StretchDIB(
+ LPBITMAPINFOHEADER biDst, // --> BITMAPINFO of destination
+ LPVOID lpvDst, // --> to destination bits
+ int DstX, // Destination origin - x coordinate
+ int DstY, // Destination origin - y coordinate
+ int DstXE, // x extent of the BLT
+ int DstYE, // y extent of the BLT
+ LPBITMAPINFOHEADER biSrc, // --> BITMAPINFO of source
+ LPVOID lpvSrc, // --> to source bits
+ int SrcX, // Source origin - x coordinate
+ int SrcY, // Source origin - y coordinate
+ int SrcXE, // x extent of the BLT
+ int SrcYE // y extent of the BLT
+ );
+
+void ResizeRGB( BITMAPINFOHEADER *pbiIn, //Src's BitMapInFoHeader
+ const unsigned char * dibBits, //Src bits
+ BITMAPINFOHEADER *pbiOut,
+ unsigned char *pFrame, //Dst bits
+ int iNewWidth, //new W in pixel
+ int iNewHeight); //new H in pixel
+
+/*
+* an X_FUNC is a function that copies one scanline, stretching or shrinking it
+* to fit a destination scanline. Pick an X_FUNC depending on
+* bitdepth and stretch ratio (1:1, 1:2, 1:4, 1:N, N:1, 4:1, 2:1)
+*
+* the x_fract argument is the delta fraction: it is a representation
+* of the smaller extent (whichever that is) as a fraction of the larger,
+* and is used when stretching or shrinking to advance the pointer to the
+* smaller scanline every (fract) pixels of the larger.
+* Thus if we are expanding 1:8, x_fract will be 1/8, we will advance the
+* source pointer once every 8 pixels, and thus copy each source pixel to
+* 8 dest pixels. Note that if shrinking 8:1, x_fract will still be 1/8
+* and we will use it to control advancement of the dest pointer.
+* the fraction is multiplied by 65536.
+*/
+typedef void (*X_FUNC) (LPBYTE lpSrc,
+ LPBYTE lpDst,
+ int SrcXE,
+ int DstXE,
+ int x_fract);
+
+
+void X_Stretch_1_1_8Bits(LPBYTE lpSrc, LPBYTE lpDst, int SrcXE, int DstXE, int x_fract);
+void X_Stretch_1_2_8Bits(LPBYTE lpSrc, LPBYTE lpDst, int SrcXE, int DstXE, int x_fract);
+void X_Stretch_1_4_8Bits(LPBYTE lpSrc, LPBYTE lpDst, int SrcXE, int DstXE, int x_fract);
+void X_Stretch_1_N_8Bits(LPBYTE lpSrc, LPBYTE lpDst, int SrcXE, int DstXE, int x_fract);
+void X_Stretch_N_1_8Bits(LPBYTE lpSrc, LPBYTE lpDst, int SrcXE, int DstXE, int x_fract);
+
+void X_Stretch_1_1_16Bits(LPBYTE lpSrc, LPBYTE lpDst, int SrcXE, int DstXE, int x_fract);
+void X_Stretch_1_2_16Bits(LPBYTE lpSrc, LPBYTE lpDst, int SrcXE, int DstXE, int x_fract);
+void X_Stretch_1_N_16Bits(LPBYTE lpSrc, LPBYTE lpDst, int SrcXE, int DstXE, int x_fract);
+void X_Stretch_N_1_16Bits(LPBYTE lpSrc, LPBYTE lpDst, int SrcXE, int DstXE, int x_fract);
+
+void X_Stretch_1_1_24Bits(LPBYTE lpSrc, LPBYTE lpDst, int SrcXE, int DstXE, int x_fract);
+void X_Stretch_1_N_24Bits(LPBYTE lpSrc, LPBYTE lpDst, int SrcXE, int DstXE, int x_fract);
+void X_Stretch_N_1_24Bits(LPBYTE lpSrc, LPBYTE lpDst, int SrcXE, int DstXE, int x_fract);
+
+void X_Stretch_1_1_32Bits(LPBYTE lpSrc, LPBYTE lpDst, int SrcXE, int DstXE, int x_fract);
+void X_Stretch_1_N_32Bits(LPBYTE lpSrc, LPBYTE lpDst, int SrcXE, int DstXE, int x_fract);
+void X_Stretch_N_1_32Bits(LPBYTE lpSrc, LPBYTE lpDst, int SrcXE, int DstXE, int x_fract);
+
+
+/*
+* Y_Stretch_* functions copy DstYE scanlines (using
+* an X_FUNC to copy each scanline) omitting or duplicating scanlines to
+* fit the destination extent. Pick a Y_ depending on the ratio
+* (1:N, N:1...)
+*/
+
+void Y_Stretch_1_N(LPBYTE lpSrc, LPBYTE lpDst, int SrcXE,int SrcYE, int DstXE,
+ int DstYE, int SrcWidth, int DstWidth, int x_fract,
+ X_FUNC x_func, int nBits);
+
+void Y_Stretch_N_1(LPBYTE lpSrc, LPBYTE lpDst, int SrcXE,int SrcYE, int DstXE,
+ int DstYE, int SrcWidth, int DstWidth, int x_fract,
+ X_FUNC x_func);
+
+/*
+* special case y-stretch functions for 1:2 in both dimensions for 8 and 16 bits
+* takes no X_FUNC arg. Will do entire stretch.
+*/
+void Stretch_1_2_8Bits(LPBYTE lpSrc, LPBYTE lpDst, int SrcXE,int SrcYE, int DstXE,
+ int DstYE, int SrcWidth, int DstWidth, int x_fract);
+
+
+void Stretch_1_2_16Bits(LPBYTE lpSrc, LPBYTE lpDst, int SrcXE,int SrcYE, int DstXE,
+ int DstYE, int SrcWidth, int DstWidth, int x_fract);
+
+/* straight copy of one scanline of count bytes */
+void X_CopyScanline(LPBYTE lpSrc, LPBYTE lpDst, int count);
+
+#endif //RESIZER_H
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