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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/gfx/x/visual_picker_glx.h"
#include <algorithm>
#include <bitset>
#include <cstring>
#include <map>
#include <numeric>
#include "ui/gfx/x/connection.h"
#include "ui/gfx/x/future.h"
#include "ui/gfx/x/glx.h"
namespace x11 {
namespace {
// These constants are obtained from GL/glx.h and GL/glxext.h.
constexpr uint32_t GLX_LEVEL = 3;
constexpr uint32_t GLX_DOUBLEBUFFER = 5;
constexpr uint32_t GLX_STEREO = 6;
constexpr uint32_t GLX_BUFFER_SIZE = 2;
constexpr uint32_t GLX_AUX_BUFFERS = 7;
constexpr uint32_t GLX_RED_SIZE = 8;
constexpr uint32_t GLX_GREEN_SIZE = 9;
constexpr uint32_t GLX_BLUE_SIZE = 10;
constexpr uint32_t GLX_ALPHA_SIZE = 11;
constexpr uint32_t GLX_DEPTH_SIZE = 12;
constexpr uint32_t GLX_STENCIL_SIZE = 13;
constexpr uint32_t GLX_ACCUM_RED_SIZE = 14;
constexpr uint32_t GLX_ACCUM_GREEN_SIZE = 15;
constexpr uint32_t GLX_ACCUM_BLUE_SIZE = 16;
constexpr uint32_t GLX_ACCUM_ALPHA_SIZE = 17;
constexpr uint32_t GLX_VISUAL_CAVEAT_EXT = 0x20;
constexpr uint32_t GLX_X_VISUAL_TYPE = 0x22;
constexpr uint32_t GLX_NONE_EXT = 0x8000;
constexpr uint32_t GLX_VISUAL_ID = 0x800B;
constexpr uint32_t GLX_RENDER_TYPE = 0x8011;
constexpr uint32_t GLX_SAMPLE_BUFFERS_ARB = 100000;
bool IsArgbVisual(const Connection::VisualInfo& visual) {
auto bits = [](auto x) {
return std::bitset<8 * sizeof(decltype(x))>(x).count();
};
auto bits_rgb = bits(visual.visual_type->red_mask) +
bits(visual.visual_type->green_mask) +
bits(visual.visual_type->blue_mask);
return static_cast<std::size_t>(visual.format->depth) > bits_rgb;
}
// Used to filter visuals by the best class.
int VisualScore(VisualClass c_class) {
// A higher score is more preferable.
switch (c_class) {
case VisualClass::TrueColor:
return 1;
case VisualClass::DirectColor:
return 0;
default:
return -1;
}
}
VisualId PickBestGlVisual(
Connection* connection,
const Glx::GetVisualConfigsReply& configs,
base::RepeatingCallback<bool(const Connection::VisualInfo&)> pred,
bool want_alpha) {
int highest_score = -1;
VisualId best_visual{};
for (size_t cfg = 0; cfg < configs.num_visuals; cfg++) {
size_t i = cfg * configs.num_properties;
std::map<uint32_t, uint32_t> props;
static constexpr uint32_t static_props[] = {
GLX_VISUAL_ID, GLX_X_VISUAL_TYPE, GLX_RENDER_TYPE,
GLX_RED_SIZE, GLX_GREEN_SIZE, GLX_BLUE_SIZE,
GLX_ALPHA_SIZE, GLX_ACCUM_RED_SIZE, GLX_ACCUM_GREEN_SIZE,
GLX_ACCUM_BLUE_SIZE, GLX_ACCUM_ALPHA_SIZE, GLX_DOUBLEBUFFER,
GLX_STEREO, GLX_BUFFER_SIZE, GLX_DEPTH_SIZE,
GLX_STENCIL_SIZE, GLX_AUX_BUFFERS, GLX_LEVEL,
};
for (const uint32_t prop : static_props) {
props[prop] = configs.property_list[i++];
}
const size_t extra_props =
(configs.num_properties - std::size(static_props)) / 2;
for (size_t j = 0; j < extra_props; j++) {
const auto key = configs.property_list[i++];
const auto value = configs.property_list[i++];
// Mesa adds a (0, 0) key-value pair at the end of each property list.
if (!key) {
continue;
}
props[key] = value;
}
auto get = [&](uint32_t key) {
auto it = props.find(key);
return it == props.end() ? 0 : it->second;
};
const auto visual_id = static_cast<VisualId>(get(GLX_VISUAL_ID));
const auto* info = connection->GetVisualInfoFromId(visual_id);
if (!pred.Run(*info)) {
continue;
}
if (!get(GLX_DOUBLEBUFFER) || get(GLX_STEREO)) {
continue;
}
auto caveat = get(GLX_VISUAL_CAVEAT_EXT);
if (caveat && caveat != GLX_NONE_EXT) {
continue;
}
// Give precedence to the root visual if it satisfies the basic
// requirements above. This can avoid an expensive copy-on-present.
if (visual_id == connection->default_root_visual().visual_id) {
return visual_id;
}
int score = 0;
if (get(GLX_SAMPLE_BUFFERS_ARB) == 0) {
score++;
if (get(GLX_DEPTH_SIZE) == 0 && get(GLX_STENCIL_SIZE) == 0) {
score++;
const bool has_alpha = get(GLX_ALPHA_SIZE) > 0;
if (has_alpha == want_alpha) {
score++;
}
}
}
if (score > highest_score) {
highest_score = score;
best_visual = visual_id;
}
}
return best_visual;
}
VisualId PickBestSystemVisual(Connection* connection,
const Glx::GetVisualConfigsReply& configs) {
Connection::VisualInfo default_visual_info = *connection->GetVisualInfoFromId(
connection->default_root_visual().visual_id);
auto is_compatible_with_root_visual =
[](const Connection::VisualInfo& default_visual_info,
const Connection::VisualInfo& visual_info) {
const auto& dvt = *default_visual_info.visual_type;
const auto& vt = *visual_info.visual_type;
return vt.c_class == dvt.c_class &&
visual_info.format->depth == default_visual_info.format->depth &&
vt.red_mask == dvt.red_mask && vt.green_mask == dvt.green_mask &&
vt.blue_mask == dvt.blue_mask &&
vt.colormap_entries == dvt.colormap_entries &&
vt.bits_per_rgb_value == dvt.bits_per_rgb_value;
};
return PickBestGlVisual(
connection, configs,
base::BindRepeating(is_compatible_with_root_visual, default_visual_info),
IsArgbVisual(default_visual_info));
}
VisualId PickBestRgbaVisual(Connection* connection,
const Glx::GetVisualConfigsReply& configs) {
int best_class_score = -1;
for (const auto& depth : connection->default_screen().allowed_depths) {
for (const auto& vis : depth.visuals) {
best_class_score = std::max(best_class_score, VisualScore(vis.c_class));
}
}
auto pred = [](int best_class_score,
const Connection::VisualInfo& visual_info) {
if (!IsArgbVisual(visual_info)) {
return false;
}
return VisualScore(visual_info.visual_type->c_class) == best_class_score;
};
return PickBestGlVisual(connection, configs,
base::BindRepeating(pred, best_class_score), true);
}
} // anonymous namespace
void PickBestVisuals(Connection* connection,
VisualId& system_visual,
VisualId& rgba_visual) {
auto screen = static_cast<uint32_t>(connection->DefaultScreenId());
if (auto configs = connection->glx().GetVisualConfigs(screen).Sync()) {
system_visual = PickBestSystemVisual(connection, *configs.reply);
rgba_visual = PickBestRgbaVisual(connection, *configs.reply);
}
}
} // namespace x11
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