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Merge 05587e6473 into 467dec4d16
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Hermès BÉLUSCA - MAÏTO
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147
sdk/include/reactos/drivers/bootvid/framebuf.h
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sdk/include/reactos/drivers/bootvid/framebuf.h
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/*
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* PROJECT: ReactOS Boot Video Driver
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* LICENSE: MIT (https://spdx.org/licenses/MIT)
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* PURPOSE: Definitions for framebuffer-specific DisplayController
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* device boot-time configuration data stored in the
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* \Registry\Machine\Hardware\Description ARC tree.
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* COPYRIGHT: Copyright 2023-2024 Hermès Bélusca-Maïto <hermes.belusca-maito@reactos.org>
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*/
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#pragma once
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @brief Framebuffer-specific device data.
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*
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* Supplemental data, extends CM_VIDEO_DEVICE_DATA.
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* Gets appended to the standard configuration resource list.
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* Any optional Irql/Vector interrupt settings are specified with
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* a CmResourceTypeInterrupt descriptor, while any other I/O port
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* is specified with a CmResourceTypePort descriptor.
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* The framebuffer base and size are specified by the first
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* CmResourceTypeMemory descriptor.
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**/
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typedef struct _CM_FRAMEBUF_DEVICE_DATA
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{
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CM_VIDEO_DEVICE_DATA;
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/* NOTE: FrameBufferSize == PixelsPerScanLine x ScreenHeight x PixelElementSize */
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/* Horizontal and Vertical resolution in pixels */
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ULONG ScreenWidth;
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ULONG ScreenHeight;
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/* Number of pixel elements per video memory line. Related to the
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* number of bytes per scan-line ("Pitch", or "ScreenStride") via:
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* Pitch = PixelsPerScanLine * BytesPerPixel */
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ULONG PixelsPerScanLine;
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ULONG BitsPerPixel; // == BytesPerPixel * 8 ("PixelDepth")
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// MEMMODEL MemoryModel; // Linear, banked, ...
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/*
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* Physical format of the pixel for BPP > 8, specified by bit-mask.
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* A bit being set defines those used for the given color component,
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* such as Red, Green, Blue, or Reserved.
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*/
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// UCHAR NumberRedBits;
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// UCHAR NumberGreenBits;
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// UCHAR NumberBlueBits;
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// UCHAR NumberReservedBits;
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struct /*FB_PIXEL_BITMASK*/
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{
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ULONG RedMask;
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ULONG GreenMask;
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ULONG BlueMask;
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ULONG ReservedMask;
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} PixelInformation; // PixelMasks;
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} CM_FRAMEBUF_DEVICE_DATA, *PCM_FRAMEBUF_DEVICE_DATA;
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/* EFI 1.x */
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#ifdef EFI_UGA_DRAW_PROTOCOL_GUID
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/* NOTE: EFI UGA does not support any other format than 32-bit xRGB, and
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* no direct access to the underlying hardware framebuffer is offered */
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// C_ASSERT(sizeof(EFI_UGA_PIXEL) == sizeof(ULONG));
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#endif /* EFI */
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/* UEFI support, see efi/GraphicsOutput.h */
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#ifdef EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID // __GRAPHICS_OUTPUT_H__
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C_ASSERT(RTL_FIELD_SIZE(CM_FRAMEBUF_DEVICE_DATA, PixelInformation) == sizeof(EFI_PIXEL_BITMASK));
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// C_ASSERT(sizeof(EFI_GRAPHICS_OUTPUT_BLT_PIXEL) == sizeof(ULONG));
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/**
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* @brief Maps UEFI GOP pixel format to pixel masks.
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* @see EFI_PIXEL_BITMASK
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**/
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static EFI_PIXEL_BITMASK EfiPixelMasks[] =
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{ /* Red, Green, Blue, Reserved */
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{0x000000FF, 0x0000FF00, 0x00FF0000, 0xFF000000}, // PixelRedGreenBlueReserved8BitPerColor
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{0x00FF0000, 0x0000FF00, 0x000000FF, 0xFF000000}, // PixelBlueGreenRedReserved8BitPerColor
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{0, 0, 0, 0} // PixelBitMask, PixelBltOnly, ...
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};
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// TODO: this version of the struct is temporary
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// REACTOS_INTERNAL_BGCONTEXT
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typedef struct _ROSEFI_FRAMEBUFFER_DATA
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{
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ULONG_PTR BaseAddress;
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ULONG BufferSize;
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UINT32 ScreenWidth;
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UINT32 ScreenHeight;
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UINT32 PixelsPerScanLine;
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UINT32 PixelFormat;
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} ROSEFI_FRAMEBUFFER_DATA, *PROSEFI_FRAMEBUFFER_DATA;
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#endif /* UEFI */
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/**
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* @brief
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* Calculates the number of bits per pixel ("PixelDepth") for
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* the given pixel format, given by the pixel color masks.
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*
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* @note
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* The calculation is done by finding the highest bit set in
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* the combined pixel color masks.
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*
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* @remark
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* See UEFI Spec Rev.2.10 Section 12.9 "Graphics Output Protocol":
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* example code "GetPixelElementSize()" function.
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**/
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FORCEINLINE
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ULONG
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PixelBitmasksToBpp(
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ULONG RedMask,
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ULONG GreenMask,
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ULONG BlueMask,
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ULONG ReservedMask)
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{
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ULONG CompoundMask = (RedMask | GreenMask | BlueMask | ReservedMask);
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#if 1
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ULONG ret = 0;
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return (_BitScanReverse(&ret, CompoundMask) ? ret : 0);
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#else
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ULONG ret = 32; // (8 * sizeof(ULONG));
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while ((CompoundMask & (1 << 31)) == 0)
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{
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ret--;
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CompoundMask <<= 1;
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}
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return ret;
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#endif
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}
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#ifdef __cplusplus
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}
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#endif
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/* EOF */
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