[55401] | 1 | /* $Id: DisplayResampleImage.cpp 98103 2023-01-17 14:15:46Z 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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[98103] | 7 | * Copyright (C) 2009-2023 Oracle and/or its affiliates.
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[24942] | 8 | *
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[96407] | 9 | * This file is part of VirtualBox base platform packages, as
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| 10 | * available from https://www.virtualbox.org.
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| 11 | *
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| 12 | * This program is free software; you can redistribute it and/or
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| 13 | * modify it under the terms of the GNU General Public License
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| 14 | * as published by the Free Software Foundation, in version 3 of the
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| 15 | * License.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful, but
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| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | * General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | *
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| 25 | * SPDX-License-Identifier: GPL-3.0-only
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[24942] | 26 | */
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| 27 |
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[24373] | 28 | #include <iprt/types.h>
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| 29 |
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[63486] | 30 | DECLINLINE(void) imageSetPixel (uint8_t *im, int x, int y, int color, int w)
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[24373] | 31 | {
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| 32 | *(int32_t *)(im + y * w * 4 + x * 4) = color;
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| 33 | }
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| 34 |
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[63486] | 35 | #define trueColorGetAlpha(c) (((c) & 0x7F000000) >> 24)
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| 36 | #define trueColorGetRed(c) (((c) & 0xFF0000) >> 16)
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| 37 | #define trueColorGetGreen(c) (((c) & 0x00FF00) >> 8)
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| 38 | #define trueColorGetBlue(c) ((c) & 0x0000FF)
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[24373] | 39 |
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[33540] | 40 | /* Fast integer implementation for 32 bpp bitmap scaling.
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[63486] | 41 | * Using fixed point values * 16.
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[31279] | 42 | */
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| 43 | typedef int32_t FIXEDPOINT;
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| 44 | #define INT_TO_FIXEDPOINT(i) (FIXEDPOINT)((i) << 4)
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| 45 | #define FIXEDPOINT_TO_INT(v) (int)((v) >> 4)
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| 46 | #define FIXEDPOINT_FLOOR(v) ((v) & ~0xF)
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| 47 | #define FIXEDPOINT_FRACTION(v) ((v) & 0xF)
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| 48 |
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| 49 | /* For 32 bit source only. */
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| 50 | void BitmapScale32 (uint8_t *dst,
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[63486] | 51 | int dstW, int dstH,
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| 52 | const uint8_t *src,
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| 53 | int iDeltaLine,
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| 54 | int srcW, int srcH)
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[31279] | 55 | {
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| 56 | int x, y;
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| 57 |
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| 58 | for (y = 0; y < dstH; y++)
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| 59 | {
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| 60 | FIXEDPOINT sy1 = INT_TO_FIXEDPOINT(y * srcH) / dstH;
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| 61 | FIXEDPOINT sy2 = INT_TO_FIXEDPOINT((y + 1) * srcH) / dstH;
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| 62 |
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| 63 | for (x = 0; x < dstW; x++)
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| 64 | {
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| 65 | FIXEDPOINT red = 0, green = 0, blue = 0;
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| 66 |
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| 67 | FIXEDPOINT sx1 = INT_TO_FIXEDPOINT(x * srcW) / dstW;
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| 68 | FIXEDPOINT sx2 = INT_TO_FIXEDPOINT((x + 1) * srcW) / dstW;
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| 69 |
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| 70 | FIXEDPOINT spixels = (sx2 - sx1) * (sy2 - sy1);
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| 71 |
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| 72 | FIXEDPOINT sy = sy1;
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| 73 |
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| 74 | do
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| 75 | {
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| 76 | FIXEDPOINT yportion;
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| 77 | if (FIXEDPOINT_FLOOR (sy) == FIXEDPOINT_FLOOR (sy1))
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| 78 | {
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| 79 | yportion = INT_TO_FIXEDPOINT(1) - FIXEDPOINT_FRACTION(sy);
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| 80 | if (yportion > sy2 - sy1)
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| 81 | {
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| 82 | yportion = sy2 - sy1;
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| 83 | }
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| 84 | sy = FIXEDPOINT_FLOOR (sy);
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| 85 | }
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| 86 | else if (sy == FIXEDPOINT_FLOOR (sy2))
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| 87 | {
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| 88 | yportion = FIXEDPOINT_FRACTION(sy2);
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| 89 | }
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| 90 | else
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| 91 | {
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| 92 | yportion = INT_TO_FIXEDPOINT(1);
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| 93 | }
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| 94 |
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| 95 | const uint8_t *pu8SrcLine = src + iDeltaLine * FIXEDPOINT_TO_INT(sy);
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| 96 | FIXEDPOINT sx = sx1;
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| 97 | do
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| 98 | {
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| 99 | FIXEDPOINT xportion;
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| 100 | FIXEDPOINT pcontribution;
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| 101 | if (FIXEDPOINT_FLOOR (sx) == FIXEDPOINT_FLOOR (sx1))
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| 102 | {
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| 103 | xportion = INT_TO_FIXEDPOINT(1) - FIXEDPOINT_FRACTION(sx);
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| 104 | if (xportion > sx2 - sx1)
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| 105 | {
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| 106 | xportion = sx2 - sx1;
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| 107 | }
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| 108 | pcontribution = xportion * yportion;
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| 109 | sx = FIXEDPOINT_FLOOR (sx);
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| 110 | }
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| 111 | else if (sx == FIXEDPOINT_FLOOR (sx2))
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| 112 | {
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| 113 | xportion = FIXEDPOINT_FRACTION(sx2);
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| 114 | pcontribution = xportion * yportion;
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| 115 | }
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| 116 | else
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| 117 | {
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| 118 | xportion = INT_TO_FIXEDPOINT(1);
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| 119 | pcontribution = xportion * yportion;
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| 120 | }
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| 121 | /* Color depth specific code begin */
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[85210] | 122 | int32_t p = *(int32_t *)(pu8SrcLine + FIXEDPOINT_TO_INT(sx) * 4);
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[31279] | 123 | /* Color depth specific code end */
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[63486] | 124 | red += trueColorGetRed (p) * pcontribution;
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| 125 | green += trueColorGetGreen (p) * pcontribution;
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| 126 | blue += trueColorGetBlue (p) * pcontribution;
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[31279] | 127 |
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| 128 | sx += INT_TO_FIXEDPOINT(1);
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| 129 | } while (sx < sx2);
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| 130 |
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| 131 | sy += INT_TO_FIXEDPOINT(1);
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| 132 | } while (sy < sy2);
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| 133 |
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| 134 | if (spixels != 0)
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| 135 | {
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| 136 | red /= spixels;
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| 137 | green /= spixels;
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| 138 | blue /= spixels;
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| 139 | }
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| 140 | /* Clamping to allow for rounding errors above */
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| 141 | if (red > 255)
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| 142 | {
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| 143 | red = 255;
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| 144 | }
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| 145 | if (green > 255)
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| 146 | {
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| 147 | green = 255;
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| 148 | }
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| 149 | if (blue > 255)
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| 150 | {
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| 151 | blue = 255;
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| 152 | }
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[63486] | 153 | imageSetPixel (dst,
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| 154 | x, y,
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| 155 | ( ((int) red) << 16) + (((int) green) << 8) + ((int) blue),
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| 156 | dstW);
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[31279] | 157 | }
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| 158 | }
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| 159 | }
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