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Implement ShmGetImage

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Also SHM extension is now only compiled if the system has shmat and
shmdt
This commit is contained in:
Oskari Alaranta
2026-02-12 18:40:55 +02:00
parent 188f9182ea
commit 632787b142
5 changed files with 155 additions and 52 deletions
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65
xbanan/Base.cpp
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@@ -2780,63 +2780,36 @@ BAN::ErrorOr<void> handle_packet(Client& client_info, BAN::ConstByteSpan packet)
dprintln(" planeMask: {}", request.planeMask);
auto& object = *g_objects[request.drawable];
auto [out_data, out_w, out_h, out_depth] = get_drawable_info(object);
auto [in_data, in_w, in_h, in_depth] = get_drawable_info(object);
uint8_t bpp = 0;
for (const auto& format : g_formats)
if (format.depth == out_depth)
bpp = format.bitsPerPixel;
ASSERT(bpp && 32 % bpp == 0);
const auto dwords = image_dwords(request.width, request.height, in_depth);
ASSERT(request.x >= 0 && request.y >= 0);
ASSERT(request.x + request.width <= out_w);
ASSERT(request.y + request.height <= out_h);
const CARD32 length = (request.width * bpp + 31) / 32 * request.height;
xGetImageReply reply {
.type = X_Reply,
.depth = out_depth,
.depth = in_depth,
.sequenceNumber = client_info.sequence,
.length = length,
.length = dwords,
.visual = g_visual.visualID,
};
TRY(encode(client_info.output_buffer, reply));
if (request.format != ZPixmap)
dwarnln("GetImage with format {}", request.format);
const auto old_size = client_info.output_buffer.size();
TRY(client_info.output_buffer.resize(old_size + dwords * 4));
if (bpp == 32)
{
for (int32_t y = 0; y < request.height; y++)
{
const size_t index = (request.y + y) * out_w + request.x;
const auto slice = out_data.slice(index * 4, request.width * 4);
TRY(encode(client_info.output_buffer, slice));
}
}
else
{
BAN::Vector<uint32_t> scanline;
TRY(scanline.resize((request.width * bpp + 31) / 32));
auto* out_data = client_info.output_buffer.data() + old_size;
for (int32_t y = 0; y < request.height; y++)
{
for (auto& dword : scanline)
dword = 0;
const auto row_off = (request.y + y) * out_w;
for (int32_t x = 0; x < request.width; x++)
{
const auto bit_offset = x * bpp;
const auto dword = bit_offset / 32;
const auto shift = bit_offset % 32;
const auto mask = (1u << bpp) - 1;
scanline[dword] |= (out_data[row_off + (request.x + x)] & mask) << shift;
}
TRY(encode(client_info.output_buffer, scanline));
}
}
get_image({
.out_data = out_data,
.in_data = in_data.data(),
.in_x = request.x,
.in_y = request.y,
.in_w = in_w,
.in_h = in_h,
.w = request.width,
.h = request.height,
.depth = in_depth,
.format = request.format,
});
break;
}