Bananymous/xbanan
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Add basic MIT-SHM support

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Supports only Attach, Detach and PutImage but those seem to be enough
for firefox and chromium
This commit is contained in:
Oskari Alaranta
2026-02-12 02:39:24 +02:00
parent 545ddefcce
commit abaa239505
6 changed files with 423 additions and 61 deletions
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81
xbanan/Base.cpp
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@@ -1,5 +1,6 @@
#include "Definitions.h"
#include "Extensions.h"
#include "Image.h"
#include "Keymap.h"
#include "Utils.h"
@@ -331,7 +332,7 @@ static void invalidate_window_recursive(WINDOW wid, int32_t x, int32_t y, int32_
);
}
static void invalidate_window(WINDOW wid, int32_t x, int32_t y, int32_t w, int32_t h)
void invalidate_window(WINDOW wid, int32_t x, int32_t y, int32_t w, int32_t h)
{
ASSERT(wid != g_root.windowId);
@@ -2720,66 +2721,24 @@ BAN::ErrorOr<void> handle_packet(Client& client_info, BAN::ConstByteSpan packet)
break;
}
uint8_t bpp = 0;
for (const auto& format : g_formats)
if (format.depth == request.depth)
bpp = format.bitsPerPixel;
ASSERT(bpp && 32 % bpp == 0);
uint32_t (*get_pixel)(int32_t x, int32_t y, uint8_t bpp, uint32_t width, const uint32_t* data) = nullptr;
switch (request.format)
{
case XYBitmap:
ASSERT(request.depth == 1);
[[fallthrough]];
case ZPixmap:
if (bpp == 32)
{
get_pixel =
[](int32_t x, int32_t y, uint8_t bpp, uint32_t width, const uint32_t* data) -> uint32_t
{
(void)bpp;
return data[y * width + x];
};
}
else
{
get_pixel =
[](int32_t x, int32_t y, uint8_t bpp, uint32_t width, const uint32_t* data) -> uint32_t
{
const auto bits_per_scanline = (bpp * width + 31) / 32 * 32;
const auto bit_offset = y * bits_per_scanline + x * bpp;
const auto dword = bit_offset / 32;
const auto shift = bit_offset % 32;
const auto mask = (1u << bpp) - 1;
return (data[dword] >> shift) & mask;
};
}
break;
default:
dwarnln("PutImage unsupported format {}, depth {}", request.format, request.depth);
break;
}
if (get_pixel != nullptr)
{
const auto* in_data_u32 = packet.as_span<const uint32_t>().data();
auto* out_data_u32 = out_data.as_span<uint32_t>().data();
const auto min_x = BAN::Math::max<int32_t>(0, -request.dstX);
const auto min_y = BAN::Math::max<int32_t>(0, -request.dstY);
const auto max_x = BAN::Math::min<int32_t>(request.width, out_w - request.dstX);
const auto max_y = BAN::Math::min<int32_t>(request.height, out_h - request.dstY);
for (int32_t y = min_y; y < max_y; y++)
{
const auto row_off = (request.dstY + y) * out_w;
for (int32_t x = min_x; x < max_x; x++)
out_data_u32[row_off + (request.dstX + x)] = get_pixel(x, y, bpp, request.width, in_data_u32);
}
}
put_image({
.out_data = out_data.data(),
.out_x = request.dstX,
.out_y = request.dstY,
.out_w = out_w,
.out_h = out_h,
.out_depth = out_depth,
.in_data = packet.data(),
.in_x = 0,
.in_y = 0,
.in_w = request.width,
.in_h = request.height,
.in_depth = request.depth,
.w = request.width,
.h = request.height,
.left_pad = request.leftPad,
.format = request.format,
});
if (object.type == Object::Type::Window)
invalidate_window(request.drawable, request.dstX, request.dstY, request.width, request.height);