611376dbc1
feat: xorg text overlays, font atlas generator, v4l2_view_cli
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- tools/gen_font_atlas: Python/Pillow build tool — skyline packs DejaVu
Sans glyphs 32-255 into a grayscale atlas, emits build/gen/font_atlas.h
with pixel data and Font_Glyph[256] metrics table
- xorg: bitmap font atlas text overlay rendering (GL_R8 atlas texture,
alpha-blended glyph quads, dark background rect per overlay)
- xorg: add xorg_viewer_set_overlay_text / clear_overlays API
- xorg: add xorg_viewer_handle_events for streaming use (events only,
no redundant render)
- xorg_cli: show today's date as white text overlay
- v4l2_view_cli: new tool — V4L2 capture with format auto-selection
(highest FPS then largest resolution), MJPEG/YUYV, measured FPS overlay
- docs: update README, planning, architecture to reflect current status
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com >
2026-03-28 22:13:59 +00:00
7fd79e6120
feat: xorg viewer scale modes, resize fix, arch notes
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Scale modes (STRETCH/FIT/FILL/1:1) with CENTER/TOP_LEFT anchor:
- UV crop via u_uv_scale/u_uv_offset uniforms in vertex shader
- glViewport sub-rect + glClear for FIT and 1:1 modes
- xorg_viewer_set_scale() / xorg_viewer_set_anchor() setters
- Stub implementations for both
Resize fix: glfwSetWindowUserPointer + framebuffer_size_callback calls
render() synchronously during resize so image tracks window edge
immediately. Forward declaration added to fix implicit decl error.
Q/Escape close the window via key_callback.
xorg_cli: --scale and --anchor arguments added.
architecture.md:
- Scale mode table and anchor docs in Frame Viewer Sink section
- Render loop design note: frame-driven not timer-driven, resize callback
rationale, threading note (GL context ownership, frame queue)
- Text overlay section: tier 1 bitmap atlas (Pillow build tool, skyline
packing, quad rendering), tier 2 HarfBuzz+FreeType, migration path
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com >
2026-03-28 21:30:28 +00:00
a1b52145d0
feat: add test_image module, xorg viewer sink, and feature flag build system
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Feature flags (FEATURES= make variable):
glfw — GLFW + OpenGL viewer (libglfw3, libglew)
vulkan — future Vulkan renderer
turbojpeg — MJPEG decode/encode (libturbojpeg)
xorg — XRandR geometry + screen grab (libx11, libxrandr)
vaapi — VA-API hardware codec (libva)
Each flag injects -DHAVE_<FEATURE> and the relevant pkg-config flags.
Headless build: make (no FEATURES set).
test_image module (src/modules/test_image/):
Generates test frames in YUV420, YUV422, and BGRA.
Patterns: SMPTE 75% colour bars, greyscale ramp, white/black grid.
BT.601 limited-range RGB→YCbCr in write_pixel().
test_image_cli (dev/cli/):
Generates a frame and writes it as a PPM file for visual verification.
Usage: test_image_cli [--pattern bars|ramp|grid]
[--width N] [--height N]
[--format yuv420|yuv422|bgra]
--out FILE.ppm
xorg module (src/modules/xorg/):
xorg.c — full GLFW+OpenGL implementation (compiled with FEATURES=glfw)
xorg_stub.c — no-op stub (compiled otherwise; xorg_available() returns false)
Renderer: full-screen quad via gl_VertexID, three GL_R8 textures for YUV,
BT.601 matrix in fragment shader, GL_BGRA texture for packed frames.
MJPEG path: tjDecompressToYUVPlanes → planar YUV → upload (requires turbojpeg).
push_yuv420/push_bgra/push_mjpeg all usable independently.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com >
2026-03-28 20:54:07 +00:00
