89 lines
3.2 KiB
C#
89 lines
3.2 KiB
C#
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///////////////////////////////////////////////////////////////////////////////
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//
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// Microsoft Research Singularity
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//
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//
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// File: BitmapInfoHeader.cs
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//
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// Note:
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//
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using System;
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using System.Runtime.InteropServices;
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using Microsoft.SingSharp;
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using Microsoft.Singularity;
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using Microsoft.Singularity.Channels;
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namespace Microsoft.Singularity.Io
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{
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[CLSCompliant(false)]
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[StructLayout(LayoutKind.Explicit)]
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public pointerfree struct BITMAPINFOHEADER {
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[FieldOffset( 0)] public uint biSize;
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[FieldOffset( 4)] public int biWidth;
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[FieldOffset( 8)] public int biHeight;
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[FieldOffset(12)] public ushort biPlanes;
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[FieldOffset(14)] public ushort biBitCount;
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[FieldOffset(16)] public uint biCompression;
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[FieldOffset(20)] public uint biSizeImage;
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[FieldOffset(24)] public int biXPelsPerMeter;
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[FieldOffset(28)] public int biYPelsPerMeter;
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[FieldOffset(30)] public uint biClrUsed;
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[FieldOffset(32)] public uint biClrImportant;
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public static BITMAPINFOHEADER Read(byte[]! in ExHeap buffer,
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int offset, out int used)
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{
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if (buffer == null || offset < 0 ||
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offset + sizeof(BITMAPINFOHEADER) > buffer.Length) {
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unchecked {
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Tracing.Log(Tracing.Error,
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"BITMAPINFOHEADER Read(offset={0}, length={1})",
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(UIntPtr)(uint)offset,
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(UIntPtr)(uint)buffer.Length);
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}
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throw new OverflowException("Read source invalid.");
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}
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used = offset + sizeof(BITMAPINFOHEADER);
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ref BITMAPINFOHEADER bmih = ref buffer[offset];
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return bmih;
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}
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public RGB[] ReadPalette(byte[]! in ExHeap buffer, int offset, out int used)
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{
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if (biClrUsed == 0 && biBitCount >= 24) {
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used = offset;
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return null;
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}
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int count = (biClrUsed != 0) ? (int)biClrUsed : (1 << biBitCount);
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if (buffer == null || offset < 0 ||
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offset + count * sizeof(uint) > buffer.Length) {
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unchecked {
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Tracing.Log(Tracing.Error,
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"RGB Read(offset={0}, count={1}, length={2}",
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(UIntPtr)(uint)offset,
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(UIntPtr)(uint)count,
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(UIntPtr)(uint)buffer.Length);
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}
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throw new OverflowException("Read source invalid.");
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}
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RGB[] values = new RGB [count];
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used = offset;
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offset += sizeof(uint);
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for (int i = 0; i < count; i++) {
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values[i] = new RGB(buffer[2+offset], buffer[1+offset], buffer[0+offset]);
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offset += sizeof(uint);
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}
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return values;
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}
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}
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} // namespace Microsoft.Singularity.Io
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