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v/cmd/tools/vgret.v

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// Copyright (c) 2021 Lars Pontoppidan. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
//
// vgret (V Graphics REgression Tool) aids in generating screenshots of various graphical `gg`
// based V applications, in a structured directory hierarchy, with the intent of either:
// * Generate a directory structure of screenshots/images to test against
// (which, as an example, could later be pushed to a remote git repository)
// * Test for *visual* differences between two, structurally equal, directories
//
// vgret uses features and applications that is currently only available on Linux based distros:
// idiff : `sudo apt install openimageio-tools` to programmatically find *visual* differences between two images.
//
// For developers:
// For a quick overview of the generated images you can use `montage` from imagemagick to generate a "Contact Sheet":
// montage -verbose -label '%f' -font Helvetica -pointsize 10 -background '#000000' -fill 'gray' -define jpeg:size=200x200 -geometry 200x200+2+2 -auto-orient $(fd -t f . /path/to/vgret/out/dir) /tmp/montage.jpg
//
// To generate the reference images locally - or for uploading to a remote repo like `gg-regression-images`
// You can do the following:
// 1. `export DISPLAY=:99` # Start all graphical apps on DISPLAY 99
// 2. `Xvfb $DISPLAY -screen 0 1280x1024x24 &` # Starts a virtual X11 screen buffer
// 3. `v gret -v /tmp/gg-regression-images` # Generate reference images to /tmp/gg-regression-images
// 4. `v gret -v /tmp/test /tmp/gg-regression-images` # Test if the tests can pass locally by comparing to a fresh imageset
// 5. Visually check the images (you can get an overview by running the `montage` command above)
// 6. Upload to GitHub or keep locally for more testing/tweaking
//
// It's a known factor that the images generated on a local machine won't match the images generated on a remote machine by 100%.
// They will most likely differ by a small percentage - the comparison tool can be tweaked to accept these subtle changes,
// at the expense of slightly more inaccurate test results. For non-animated apps the percentage should be > 0.01.
// You can emulate or test these inaccuracies to some extend locally by simply running the test from a terminal using
// your physical X11 session display (Usually DISPLAY=:0).
//
// Read more about the options of `idiff` here: https://openimageio.readthedocs.io/en/latest/idiff.html
//
import os
import flag
import time
import toml
const (
tool_name = 'vgret'
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tool_version = '0.0.2'
tool_description = '\n Dump and/or compare rendered frames of graphical apps
both external and `gg` based apps is supported.
Examples:
Generate screenshots to `/tmp/test`
v gret /tmp/test
Generate and compare screenshots in `/tmp/src` to existing screenshots in `/tmp/dst`
v gret /tmp/src /tmp/dst
Compare screenshots in `/tmp/src` to existing screenshots in `/tmp/dst`
v gret --compare-only /tmp/src /tmp/dst
'
tmp_dir = os.join_path(os.vtmp_dir(), 'v', tool_name)
runtime_os = os.user_os()
v_root = os.real_path(@VMODROOT)
)
const (
supported_hosts = ['linux']
supported_capture_methods = ['gg_record', 'generic_screenshot']
// External tool executables
v_exe = os.getenv('VEXE')
idiff_exe = os.find_abs_path_of_executable('idiff') or { '' }
)
const (
embedded_toml = $embed_file('vgret.defaults.toml', .zlib)
default_toml = embedded_toml.to_string()
empty_toml_array = []toml.Any{}
empty_toml_map = map[string]toml.Any{}
)
struct Config {
path string
mut:
apps []AppConfig
}
struct CompareOptions {
mut:
method string = 'idiff'
flags []string
}
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struct CaptureRegion {
mut:
x int
y int
width int
height int
}
fn (cr CaptureRegion) is_empty() bool {
return cr.width == 0 && cr.height == 0
}
struct CaptureOptions {
mut:
method string = 'gg_record'
wait_ms int // used by "generic_screenshot" to wait X milliseconds *after* execution of the app
flags []string
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regions []CaptureRegion
env map[string]string
}
fn (co CaptureOptions) validate() ! {
if co.method !in supported_capture_methods {
return error('capture method "$co.method" is not supported. Supported methods are: $supported_capture_methods')
}
}
struct AppConfig {
compare CompareOptions
capture CaptureOptions
path string
abs_path string
mut:
screenshots_path string
screenshots []string
}
struct Options {
verbose bool
compare_only bool
root_path string
mut:
config Config
}
fn (opt Options) verbose_execute(cmd string) os.Result {
opt.verbose_eprintln('Running `$cmd`')
return os.execute(cmd)
}
fn (opt Options) verbose_eprintln(msg string) {
if opt.verbose {
eprintln(msg)
}
}
fn main() {
if runtime_os !in supported_hosts {
eprintln('$tool_name is currently only supported on $supported_hosts hosts')
exit(1)
}
if os.args.len == 1 {
eprintln('Usage: $tool_name PATH \n$tool_description\n$tool_name -h for more help...')
exit(1)
}
mut fp := flag.new_flag_parser(os.args[1..])
fp.application(tool_name)
fp.version(tool_version)
fp.description(tool_description)
fp.arguments_description('PATH [PATH]')
fp.skip_executable()
show_help := fp.bool('help', `h`, false, 'Show this help text.')
// Collect tool options
mut opt := Options{
verbose: fp.bool('verbose', `v`, false, "Be verbose about the tool's progress.")
compare_only: fp.bool('compare-only', `c`, false, "Don't generate screenshots - only compare input directories")
root_path: fp.string('root-path', `r`, v_root, 'Root path of the comparison')
}
toml_conf := fp.string('toml-config', `t`, default_toml, 'Path or string with TOML configuration')
arg_paths := fp.finalize()!
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if show_help {
println(fp.usage())
exit(0)
}
if arg_paths.len == 0 {
println(fp.usage())
println('\nError missing arguments')
exit(1)
}
if !os.exists(tmp_dir) {
os.mkdir_all(tmp_dir)!
}
opt.config = new_config(opt.root_path, toml_conf) or { panic(err) }
gen_in_path := arg_paths[0]
if arg_paths.len >= 1 {
generate_screenshots(mut opt, gen_in_path) or { panic(err) }
}
if arg_paths.len > 1 {
target_path := arg_paths[1]
path := opt.config.path
all_paths_in_use := [path, gen_in_path, target_path]
for path_in_use in all_paths_in_use {
if !os.is_dir(path_in_use) {
eprintln('`$path_in_use` is not a directory')
exit(1)
}
}
if path == target_path || gen_in_path == target_path || gen_in_path == path {
eprintln('Compare paths can not be the same directory `$path`/`$target_path`/`$gen_in_path`')
exit(1)
}
compare_screenshots(opt, gen_in_path, target_path)!
}
}
fn generate_screenshots(mut opt Options, output_path string) ! {
path := opt.config.path
dst_path := output_path.trim_right('/')
if !os.is_dir(path) {
return error('`$path` is not a directory')
}
for mut app_config in opt.config.apps {
file := app_config.path
app_path := app_config.abs_path
mut rel_out_path := ''
if os.is_file(app_path) {
rel_out_path = os.dir(file)
} else {
rel_out_path = file
}
if app_config.capture.method == 'gg_record' {
opt.verbose_eprintln('Compiling shaders (if needed) for `$file`')
sh_result := opt.verbose_execute('${os.quoted_path(v_exe)} shader ${os.quoted_path(app_path)}')
if sh_result.exit_code != 0 {
opt.verbose_eprintln('Skipping shader compile for `$file` v shader failed with:\n$sh_result.output')
continue
}
}
if !os.exists(dst_path) {
opt.verbose_eprintln('Creating output path `$dst_path`')
os.mkdir_all(dst_path) or { return error('Failed making directory `$dst_path`') }
}
screenshot_path := os.join_path(dst_path, rel_out_path)
if !os.exists(screenshot_path) {
os.mkdir_all(screenshot_path) or {
return error('Failed making screenshot path `$screenshot_path`')
}
}
app_config.screenshots_path = screenshot_path
app_config.screenshots = take_screenshots(opt, app_config) or {
return error('Failed taking screenshots of `$app_path`:\n$err.msg()')
}
}
}
fn compare_screenshots(opt Options, output_path string, target_path string) ! {
mut fails := map[string]string{}
mut warns := map[string]string{}
for app_config in opt.config.apps {
screenshots := app_config.screenshots
opt.verbose_eprintln('Comparing $screenshots.len screenshots in `$output_path` with `$target_path`')
for screenshot in screenshots {
relative_screenshot := screenshot.all_after(output_path + os.path_separator)
src := screenshot
target := os.join_path(target_path, relative_screenshot)
opt.verbose_eprintln('Comparing `$src` with `$target` with $app_config.compare.method')
if app_config.compare.method == 'idiff' {
if idiff_exe == '' {
return error('$tool_name need the `idiff` tool installed. It can be installed on Ubuntu with `sudo apt install openimageio-tools`')
}
diff_file := os.join_path(os.vtmp_dir(), os.file_name(src).all_before_last('.') +
'.diff.tif')
flags := app_config.compare.flags.join(' ')
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diff_cmd := '${os.quoted_path(idiff_exe)} $flags -abs -od -o ${os.quoted_path(diff_file)} -abs ${os.quoted_path(src)} ${os.quoted_path(target)}'
result := opt.verbose_execute(diff_cmd)
if result.exit_code == 0 {
opt.verbose_eprintln('OUTPUT: \n$result.output')
}
if result.exit_code != 0 {
eprintln('OUTPUT: \n$result.output')
if result.exit_code == 1 {
warns[src] = target
} else {
fails[src] = target
}
}
}
}
}
if warns.len > 0 {
eprintln('--- WARNINGS ---')
eprintln('The following files had warnings when compared to their targets')
for warn_src, warn_target in warns {
eprintln('$warn_src ~= $warn_target')
}
}
if fails.len > 0 {
eprintln('--- ERRORS ---')
eprintln('The following files did not match their targets')
for fail_src, fail_target in fails {
eprintln('$fail_src != $fail_target')
}
first := fails.keys()[0]
fail_copy := os.join_path(os.vtmp_dir(), 'fail.' + first.all_after_last('.'))
os.cp(first, fail_copy)!
eprintln('First failed file `$first` is copied to `$fail_copy`')
diff_file := os.join_path(os.vtmp_dir(), os.file_name(first).all_before_last('.') +
'.diff.tif')
diff_copy := os.join_path(os.vtmp_dir(), 'diff.tif')
if os.is_file(diff_file) {
os.cp(diff_file, diff_copy)!
eprintln('First failed diff file `$diff_file` is copied to `$diff_copy`')
eprintln('Removing alpha channel from $diff_copy ...')
final_fail_result_file := os.join_path(os.vtmp_dir(), 'diff.png')
opt.verbose_execute('convert ${os.quoted_path(diff_copy)} -alpha off ${os.quoted_path(final_fail_result_file)}')
eprintln('Final diff file: `$final_fail_result_file`')
}
exit(1)
}
}
fn take_screenshots(opt Options, app AppConfig) ![]string {
out_path := app.screenshots_path
if !opt.compare_only {
opt.verbose_eprintln('Taking screenshot(s) of `$app.path` to `$out_path`')
match app.capture.method {
'gg_record' {
for k, v in app.capture.env {
rv := v.replace('\$OUT_PATH', out_path)
opt.verbose_eprintln('Setting ENV `$k` = $rv ...')
os.setenv('$k', rv, true)
}
flags := app.capture.flags.join(' ')
result := opt.verbose_execute('${os.quoted_path(v_exe)} $flags -d gg_record run ${os.quoted_path(app.abs_path)}')
if result.exit_code != 0 {
return error('Failed taking screenshot of `$app.abs_path`:\n$result.output')
}
}
'generic_screenshot' {
for k, v in app.capture.env {
rv := v.replace('\$OUT_PATH', out_path)
opt.verbose_eprintln('Setting ENV `$k` = $rv ...')
os.setenv('$k', rv, true)
}
existing_screenshots := get_app_screenshots(out_path, app)!
flags := app.capture.flags
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if !os.exists(app.abs_path) {
return error('Failed starting app `$app.abs_path`, the path does not exist')
}
opt.verbose_eprintln('Running $app.abs_path $flags')
mut p_app := os.new_process(app.abs_path)
p_app.set_args(flags)
p_app.set_redirect_stdio()
p_app.run()
if !p_app.is_alive() {
output := p_app.stdout_read() + '\n' + p_app.stderr_read()
return error('Failed starting app `$app.abs_path` (before screenshot):\n$output')
}
if app.capture.wait_ms > 0 {
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opt.verbose_eprintln('Waiting $app.capture.wait_ms before capturing')
time.sleep(app.capture.wait_ms * time.millisecond)
}
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if !p_app.is_alive() {
output := p_app.stdout_slurp() + '\n' + p_app.stderr_slurp()
return error('App `$app.abs_path` exited ($p_app.code) before a screenshot could be captured:\n$output')
}
// Use ImageMagick's `import` tool to take the screenshot
out_file := os.join_path(out_path, os.file_name(app.path) +
'_screenshot_${existing_screenshots.len:02}.png')
result := opt.verbose_execute('import -window root "$out_file"')
if result.exit_code != 0 {
p_app.signal_kill()
return error('Failed taking screenshot of `$app.abs_path` to "$out_file":\n$result.output')
}
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// When using regions the capture is split up into regions.len
// And name the output based on each region's properties
if app.capture.regions.len > 0 {
for region in app.capture.regions {
region_id := 'x${region.x}y${region.y}w${region.width}h$region.height'
region_out_file := os.join_path(out_path, os.file_name(app.path) +
'_screenshot_${existing_screenshots.len:02}_region_${region_id}.png')
// If the region is empty (w, h == 0, 0) infer a full screenshot,
// This allows for capturing both regions *and* the complete screen
if region.is_empty() {
os.cp(out_file, region_out_file) or {
return error('Failed copying original screenshot "$out_file" to region file "$region_out_file"')
}
continue
}
extract_result := opt.verbose_execute('convert -extract ${region.width}x$region.height+$region.x+$region.y "$out_file" "$region_out_file"')
if extract_result.exit_code != 0 {
p_app.signal_kill()
return error('Failed extracting region $region_id from screenshot of `$app.abs_path` to "$region_out_file":\n$result.output')
}
}
// When done, remove the original file that was split into regions.
opt.verbose_eprintln('Removing "$out_file" (region mode)')
os.rm(out_file) or {
return error('Failed removing original screenshot "$out_file"')
}
}
p_app.signal_kill()
}
else {
return error('Unsupported capture method "$app.capture.method"')
}
}
}
return get_app_screenshots(out_path, app)!
}
fn get_app_screenshots(path string, app AppConfig) ![]string {
mut screenshots := []string{}
shots := os.ls(path) or { return error('Failed listing dir `$path`') }
for shot in shots {
if shot.starts_with(os.file_name(app.path).all_before_last('.')) {
screenshots << os.join_path(path, shot)
}
}
return screenshots
}
fn new_config(root_path string, toml_config string) !Config {
doc := if os.is_file(toml_config) {
toml.parse_file(toml_config) or { return error(err.msg()) }
} else {
toml.parse_text(toml_config) or { return error(err.msg()) }
}
path := os.real_path(root_path).trim_right('/')
compare_method := doc.value('compare.method').default_to('idiff').string()
compare_flags := doc.value('compare.flags').default_to(empty_toml_array).array().as_strings()
default_compare := CompareOptions{
method: compare_method
flags: compare_flags
}
capture_method := doc.value('capture.method').default_to('gg_record').string()
capture_flags := doc.value('capture.flags').default_to(empty_toml_array).array().as_strings()
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capture_regions_any := doc.value('capture.regions').default_to(empty_toml_array).array()
mut capture_regions := []CaptureRegion{}
for capture_region_any in capture_regions_any {
region := CaptureRegion{
x: capture_region_any.value('x').default_to(0).int()
y: capture_region_any.value('y').default_to(0).int()
width: capture_region_any.value('width').default_to(0).int()
height: capture_region_any.value('height').default_to(0).int()
}
capture_regions << region
}
capture_wait_ms := doc.value('capture.wait_ms').default_to(0).int()
capture_env := doc.value('capture.env').default_to(empty_toml_map).as_map()
mut env_map := map[string]string{}
for k, v in capture_env {
env_map[k] = v.string()
}
default_capture := CaptureOptions{
method: capture_method
wait_ms: capture_wait_ms
flags: capture_flags
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regions: capture_regions
env: env_map
}
apps_any := doc.value('apps').default_to(empty_toml_array).array()
mut apps := []AppConfig{cap: apps_any.len}
for app_any in apps_any {
rel_path := app_any.value('path').string().trim_right('/')
// Merge, per app, overwrites
mut merged_compare := CompareOptions{}
merged_compare.method = app_any.value('compare.method').default_to(default_compare.method).string()
merged_compare_flags := app_any.value('compare.flags').default_to(empty_toml_array).array().as_strings()
if merged_compare_flags.len > 0 {
merged_compare.flags = merged_compare_flags
} else {
merged_compare.flags = default_compare.flags
}
mut merged_capture := CaptureOptions{}
merged_capture.method = app_any.value('capture.method').default_to(default_capture.method).string()
merged_capture_flags := app_any.value('capture.flags').default_to(empty_toml_array).array().as_strings()
if merged_capture_flags.len > 0 {
merged_capture.flags = merged_capture_flags
} else {
merged_capture.flags = default_capture.flags
}
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app_capture_regions_any := app_any.value('capture.regions').default_to(empty_toml_array).array()
mut app_capture_regions := []CaptureRegion{}
for capture_region_any in app_capture_regions_any {
region := CaptureRegion{
x: capture_region_any.value('x').default_to(0).int()
y: capture_region_any.value('y').default_to(0).int()
width: capture_region_any.value('width').default_to(0).int()
height: capture_region_any.value('height').default_to(0).int()
}
app_capture_regions << region
}
mut merged_capture_regions := []CaptureRegion{}
for default_capture_region in default_capture.regions {
if default_capture_region !in app_capture_regions {
merged_capture_regions << default_capture_region
}
}
for app_capture_region in app_capture_regions {
if app_capture_region !in default_capture.regions {
merged_capture_regions << app_capture_region
}
}
merged_capture.regions = merged_capture_regions
merged_capture.wait_ms = app_any.value('capture.wait_ms').default_to(default_capture.wait_ms).int()
merge_capture_env := app_any.value('capture.env').default_to(empty_toml_map).as_map()
mut merge_env_map := default_capture.env.clone()
for k, v in merge_capture_env {
merge_env_map[k] = v.string()
}
for k, v in merge_env_map {
merged_capture.env[k] = v
}
merged_capture.validate()!
app_config := AppConfig{
compare: merged_compare
capture: merged_capture
path: rel_path
abs_path: os.join_path(path, rel_path).trim_right('/')
}
apps << app_config
}
return Config{
apps: apps
path: path
}
}