[55401] | 1 | /* $Id: DisplayResampleImage.cpp 85210 2020-07-11 10:51:30Z vboxsync $ */
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[24942] | 2 | /** @file
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| 3 | * Image resampling code, used for snapshot thumbnails.
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| 4 | */
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| 5 |
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[24373] | 6 | /*
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[82968] | 7 | * Copyright (C) 2009-2020 Oracle Corporation
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[24942] | 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | */
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| 17 |
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[24373] | 18 | #include <iprt/types.h>
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| 19 |
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[63486] | 20 | DECLINLINE(void) imageSetPixel (uint8_t *im, int x, int y, int color, int w)
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[24373] | 21 | {
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| 22 | *(int32_t *)(im + y * w * 4 + x * 4) = color;
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| 23 | }
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| 24 |
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[63486] | 25 | #define trueColorGetAlpha(c) (((c) & 0x7F000000) >> 24)
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| 26 | #define trueColorGetRed(c) (((c) & 0xFF0000) >> 16)
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| 27 | #define trueColorGetGreen(c) (((c) & 0x00FF00) >> 8)
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| 28 | #define trueColorGetBlue(c) ((c) & 0x0000FF)
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[24373] | 29 |
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[33540] | 30 | /* Fast integer implementation for 32 bpp bitmap scaling.
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[63486] | 31 | * Using fixed point values * 16.
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[31279] | 32 | */
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| 33 | typedef int32_t FIXEDPOINT;
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| 34 | #define INT_TO_FIXEDPOINT(i) (FIXEDPOINT)((i) << 4)
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| 35 | #define FIXEDPOINT_TO_INT(v) (int)((v) >> 4)
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| 36 | #define FIXEDPOINT_FLOOR(v) ((v) & ~0xF)
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| 37 | #define FIXEDPOINT_FRACTION(v) ((v) & 0xF)
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| 38 |
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| 39 | /* For 32 bit source only. */
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| 40 | void BitmapScale32 (uint8_t *dst,
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[63486] | 41 | int dstW, int dstH,
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| 42 | const uint8_t *src,
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| 43 | int iDeltaLine,
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| 44 | int srcW, int srcH)
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[31279] | 45 | {
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| 46 | int x, y;
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| 47 |
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| 48 | for (y = 0; y < dstH; y++)
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| 49 | {
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| 50 | FIXEDPOINT sy1 = INT_TO_FIXEDPOINT(y * srcH) / dstH;
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| 51 | FIXEDPOINT sy2 = INT_TO_FIXEDPOINT((y + 1) * srcH) / dstH;
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| 52 |
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| 53 | for (x = 0; x < dstW; x++)
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| 54 | {
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| 55 | FIXEDPOINT red = 0, green = 0, blue = 0;
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| 56 |
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| 57 | FIXEDPOINT sx1 = INT_TO_FIXEDPOINT(x * srcW) / dstW;
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| 58 | FIXEDPOINT sx2 = INT_TO_FIXEDPOINT((x + 1) * srcW) / dstW;
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| 59 |
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| 60 | FIXEDPOINT spixels = (sx2 - sx1) * (sy2 - sy1);
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| 61 |
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| 62 | FIXEDPOINT sy = sy1;
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| 63 |
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| 64 | do
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| 65 | {
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| 66 | FIXEDPOINT yportion;
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| 67 | if (FIXEDPOINT_FLOOR (sy) == FIXEDPOINT_FLOOR (sy1))
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| 68 | {
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| 69 | yportion = INT_TO_FIXEDPOINT(1) - FIXEDPOINT_FRACTION(sy);
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| 70 | if (yportion > sy2 - sy1)
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| 71 | {
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| 72 | yportion = sy2 - sy1;
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| 73 | }
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| 74 | sy = FIXEDPOINT_FLOOR (sy);
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| 75 | }
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| 76 | else if (sy == FIXEDPOINT_FLOOR (sy2))
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| 77 | {
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| 78 | yportion = FIXEDPOINT_FRACTION(sy2);
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| 79 | }
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| 80 | else
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| 81 | {
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| 82 | yportion = INT_TO_FIXEDPOINT(1);
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| 83 | }
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| 84 |
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| 85 | const uint8_t *pu8SrcLine = src + iDeltaLine * FIXEDPOINT_TO_INT(sy);
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| 86 | FIXEDPOINT sx = sx1;
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| 87 | do
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| 88 | {
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| 89 | FIXEDPOINT xportion;
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| 90 | FIXEDPOINT pcontribution;
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| 91 | if (FIXEDPOINT_FLOOR (sx) == FIXEDPOINT_FLOOR (sx1))
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| 92 | {
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| 93 | xportion = INT_TO_FIXEDPOINT(1) - FIXEDPOINT_FRACTION(sx);
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| 94 | if (xportion > sx2 - sx1)
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| 95 | {
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| 96 | xportion = sx2 - sx1;
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| 97 | }
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| 98 | pcontribution = xportion * yportion;
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| 99 | sx = FIXEDPOINT_FLOOR (sx);
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| 100 | }
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| 101 | else if (sx == FIXEDPOINT_FLOOR (sx2))
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| 102 | {
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| 103 | xportion = FIXEDPOINT_FRACTION(sx2);
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| 104 | pcontribution = xportion * yportion;
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| 105 | }
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| 106 | else
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| 107 | {
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| 108 | xportion = INT_TO_FIXEDPOINT(1);
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| 109 | pcontribution = xportion * yportion;
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| 110 | }
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| 111 | /* Color depth specific code begin */
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[85210] | 112 | int32_t p = *(int32_t *)(pu8SrcLine + FIXEDPOINT_TO_INT(sx) * 4);
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[31279] | 113 | /* Color depth specific code end */
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[63486] | 114 | red += trueColorGetRed (p) * pcontribution;
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| 115 | green += trueColorGetGreen (p) * pcontribution;
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| 116 | blue += trueColorGetBlue (p) * pcontribution;
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[31279] | 117 |
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| 118 | sx += INT_TO_FIXEDPOINT(1);
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| 119 | } while (sx < sx2);
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| 120 |
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| 121 | sy += INT_TO_FIXEDPOINT(1);
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| 122 | } while (sy < sy2);
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| 123 |
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| 124 | if (spixels != 0)
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| 125 | {
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| 126 | red /= spixels;
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| 127 | green /= spixels;
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| 128 | blue /= spixels;
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| 129 | }
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| 130 | /* Clamping to allow for rounding errors above */
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| 131 | if (red > 255)
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| 132 | {
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| 133 | red = 255;
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| 134 | }
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| 135 | if (green > 255)
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| 136 | {
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| 137 | green = 255;
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| 138 | }
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| 139 | if (blue > 255)
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| 140 | {
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| 141 | blue = 255;
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| 142 | }
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[63486] | 143 | imageSetPixel (dst,
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| 144 | x, y,
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| 145 | ( ((int) red) << 16) + (((int) green) << 8) + ((int) blue),
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| 146 | dstW);
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[31279] | 147 | }
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| 148 | }
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| 149 | }
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