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[client] lgmp: snapshot and validate frame layouts

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This commit is contained in:
Geoffrey McRae
2026-08-24 12:37:00 +10:00
parent abf98c0267
commit ef8636cbeb
4 changed files with 253 additions and 81 deletions
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95
client/include/interface/transport.h
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@@ -21,6 +21,7 @@
#ifndef _H_LG_CLIENT_TRANSPORT_
#define _H_LG_CLIENT_TRANSPORT_
#include <limits.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
@@ -226,6 +227,100 @@ typedef struct LG_TransportFrameFormat
}
LG_TransportFrameFormat;
/*
* Validate the common packed-frame layout used by renderers. The optional
* dataSize result is the validated byte capacity required for the frame data.
*/
static inline bool lgTransport_validateFrameFormat(
const LG_TransportFrameFormat * format, LG_TransportFrameFlags flags,
size_t * dataSize)
{
if (!format)
return false;
uint32_t storageBpp;
switch (format->type)
{
case FRAME_TYPE_BGRA:
case FRAME_TYPE_RGBA:
case FRAME_TYPE_RGBA10:
case FRAME_TYPE_BGR_32:
storageBpp = 4;
break;
case FRAME_TYPE_RGBA16F:
storageBpp = 8;
break;
case FRAME_TYPE_RGB_24:
storageBpp = 3;
break;
default:
return false;
}
switch (format->rotation)
{
case FRAME_ROT_0:
case FRAME_ROT_90:
case FRAME_ROT_180:
case FRAME_ROT_270:
break;
default:
return false;
}
if (!format->screenWidth || !format->screenHeight ||
!format->dataWidth || !format->dataHeight ||
!format->frameWidth || !format->frameHeight ||
!format->stride || !format->pitch ||
format->screenWidth > INT_MAX || format->screenHeight > INT_MAX ||
format->dataWidth > INT_MAX || format->dataHeight > INT_MAX ||
format->frameWidth > INT_MAX || format->frameHeight > INT_MAX ||
format->stride > INT_MAX || format->pitch > INT_MAX)
return false;
const uint64_t rowBytes = (uint64_t)format->stride * storageBpp;
const uint64_t size = (uint64_t)format->dataHeight * format->pitch;
if (format->dataWidth > format->stride || rowBytes != format->pitch ||
size > INT_MAX || format->dataHeight > format->frameHeight ||
(format->dataHeight < format->frameHeight &&
!(flags & LG_TRANSPORT_FRAME_TRUNCATED)))
return false;
if (format->type == FRAME_TYPE_BGR_32)
{
if (format->dataWidth != format->stride ||
(uint64_t)format->frameWidth * 3U > format->pitch)
return false;
}
else if (format->dataWidth != format->frameWidth)
return false;
if (dataSize)
*dataSize = (size_t)size;
return true;
}
static inline bool lgTransport_frameLayoutMatches(
const LG_TransportFrameFormat * left,
const LG_TransportFrameFormat * right)
{
return left && right &&
left->type == right->type &&
left->screenWidth == right->screenWidth &&
left->screenHeight == right->screenHeight &&
left->dataWidth == right->dataWidth &&
left->dataHeight == right->dataHeight &&
left->frameWidth == right->frameWidth &&
left->frameHeight == right->frameHeight &&
left->rotation == right->rotation &&
left->stride == right->stride &&
left->pitch == right->pitch;
}
typedef struct LG_TransportFrame
{
uint64_t serial;