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762dd22e31
This commit introduces support for loading and rendering images in the Bowser web browser, enhancing the rendering engine to handle various image sources. Key changes include: - Updated README.md to reflect the new milestone status and added features for image support. - Added `ImageLayout` class to manage image layout and loading. - Implemented synchronous and asynchronous image loading in `src/network/images.py`, including caching mechanisms. - Expanded the DOM parsing capabilities in `DocumentLayout` to handle `<img>` tags and manage their layout directives. - Created a new `DrawImage` command in the rendering pipeline, which handles the drawing of both loaded images and placeholders for unloaded images. - Introduced a task queue for managing asynchronous image loads, ensuring UI remains responsive during image fetching. - Added unit tests for image loading, layout management, and the async task queue to ensure robust functionality and prevent regressions.
384 lines
13 KiB
Python
384 lines
13 KiB
Python
"""Tests for image loading and rendering."""
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import pytest
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import skia
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from src.network.images import load_image, ImageCache, _load_data_url
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from src.layout.embed import ImageLayout
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from src.parser.html import Element, parse_html
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from src.render.paint import DrawImage
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from src.layout.document import DocumentLayout, LayoutImage
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from io import BytesIO
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def create_test_image(width=100, height=100):
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"""Helper to create a test image."""
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# Create a surface and get an image from it
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surface = skia.Surface(width, height)
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canvas = surface.getCanvas()
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canvas.clear(skia.ColorWHITE)
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return surface.makeImageSnapshot()
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class TestImageCache:
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"""Test image caching."""
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def test_cache_singleton(self):
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"""ImageCache should be a singleton."""
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cache1 = ImageCache()
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cache2 = ImageCache()
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assert cache1 is cache2
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def test_cache_get_set(self):
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"""Test basic cache operations."""
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cache = ImageCache()
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cache.clear()
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# Create a simple test image
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image = create_test_image(100, 100)
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# Initially empty
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assert cache.get("test_url") is None
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# Set and get
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cache.set("test_url", image)
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cached = cache.get("test_url")
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assert cached is not None
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assert cached.width() == 100
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assert cached.height() == 100
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def test_cache_clear(self):
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"""Test cache clearing."""
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cache = ImageCache()
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cache.clear()
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image = create_test_image(100, 100)
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cache.set("test_url", image)
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assert cache.get("test_url") is not None
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cache.clear()
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assert cache.get("test_url") is None
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class TestDataURLLoading:
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"""Test data URL image loading."""
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def test_load_base64_png(self):
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"""Test loading a base64-encoded PNG data URL."""
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# Simple 1x1 red PNG
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data_url = (
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"data:image/png;base64,"
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"iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mP8z8DwHwAFBQIAX8jx0gAAAABJRU5ErkJggg=="
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)
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image = _load_data_url(data_url)
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assert image is not None
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assert image.width() == 1
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assert image.height() == 1
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def test_load_invalid_data_url(self):
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"""Test loading an invalid data URL."""
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image = _load_data_url("data:invalid")
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assert image is None
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image = _load_data_url("not_a_data_url")
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assert image is None
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class TestImageLayout:
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"""Test ImageLayout class."""
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def test_image_layout_init(self):
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"""Test ImageLayout initialization."""
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node = Element("img", {"src": "test.png"})
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layout = ImageLayout(node)
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assert layout.node == node
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assert layout.x == 0
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assert layout.y == 0
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assert layout.width == 0
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assert layout.height == 0
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assert layout.image is None
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assert layout.is_inline is True
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def test_layout_with_intrinsic_size(self):
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"""Test layout calculation with intrinsic image size."""
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node = Element("img", {"src": "test.png"})
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layout = ImageLayout(node)
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# Create a test image
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layout.image = create_test_image(200, 150)
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width = layout.layout()
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assert layout.width == 200
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assert layout.height == 150
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assert width == 200
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def test_layout_with_explicit_width(self):
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"""Test layout with explicit width attribute."""
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node = Element("img", {"src": "test.png", "width": "100"})
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layout = ImageLayout(node)
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# Create a test image (200x150)
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layout.image = create_test_image(200, 150)
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layout.layout()
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# Should maintain aspect ratio
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assert layout.width == 100
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assert layout.height == 75 # 100 * (150/200)
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def test_layout_with_explicit_height(self):
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"""Test layout with explicit height attribute."""
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node = Element("img", {"src": "test.png", "height": "100"})
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layout = ImageLayout(node)
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# Create a test image (200x150)
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layout.image = create_test_image(200, 150)
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layout.layout()
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# Should maintain aspect ratio
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assert layout.height == 100
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assert abs(layout.width - 133.33) < 1 # 100 * (200/150)
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def test_layout_with_both_dimensions(self):
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"""Test layout with both width and height specified."""
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node = Element("img", {"src": "test.png", "width": "100", "height": "50"})
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layout = ImageLayout(node)
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# Create a test image
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layout.image = create_test_image(200, 150)
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layout.layout()
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# Should use explicit dimensions (no aspect ratio preservation)
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assert layout.width == 100
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assert layout.height == 50
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def test_layout_with_max_width(self):
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"""Test layout constrained by max_width."""
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node = Element("img", {"src": "test.png"})
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layout = ImageLayout(node)
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# Create a large test image
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layout.image = create_test_image(1000, 500)
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layout.layout(max_width=400)
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# Should constrain to max_width and maintain aspect ratio
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assert layout.width == 400
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assert layout.height == 200 # 400 * (500/1000)
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def test_layout_no_image(self):
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"""Test layout when image fails to load."""
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node = Element("img", {"src": "test.png", "alt": "Test image"})
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layout = ImageLayout(node)
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# Don't set an image (simulating load failure)
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layout.alt_text = "Test image"
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layout.layout()
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# Should use placeholder dimensions
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assert layout.width == 100
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assert layout.height == 100
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def test_alt_text_extraction(self):
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"""Test alt text extraction."""
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node = Element("img", {"src": "test.png", "alt": "Description"})
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layout = ImageLayout(node)
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layout.load()
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assert layout.alt_text == "Description"
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class TestDrawImage:
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"""Test DrawImage paint command."""
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def test_draw_image_init(self):
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"""Test DrawImage initialization."""
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image = create_test_image(100, 100)
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cmd = DrawImage(10, 20, 100, 100, image, "Test")
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assert cmd.x == 10
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assert cmd.y == 20
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assert cmd.width == 100
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assert cmd.height == 100
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assert cmd.image is image
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assert cmd.alt_text == "Test"
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assert cmd.rect == (10, 20, 110, 120)
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def test_draw_image_with_valid_image(self):
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"""Test drawing a valid image."""
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image = create_test_image(100, 100)
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# Create a surface to draw on
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surface = skia.Surface(200, 200)
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canvas = surface.getCanvas()
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cmd = DrawImage(10, 20, 100, 100, image)
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cmd.execute(canvas)
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# If it doesn't throw, it worked
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assert True
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def test_draw_image_with_null_image(self):
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"""Test drawing when image is None (placeholder)."""
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# Create a surface to draw on
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surface = skia.Surface(200, 200)
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canvas = surface.getCanvas()
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cmd = DrawImage(10, 20, 100, 100, None, "Failed to load")
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cmd.execute(canvas)
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# Should draw placeholder without error
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assert True
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class TestDocumentLayoutImages:
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"""Test image integration in DocumentLayout."""
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def test_parse_img_element(self):
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"""Test that img elements are parsed correctly."""
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html = '<img src="test.png" alt="Test image" width="100">'
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root = parse_html(html)
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# Find the img element
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body = root.children[0]
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img = body.children[0]
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assert img.tag == "img"
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assert img.attributes["src"] == "test.png"
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assert img.attributes["alt"] == "Test image"
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assert img.attributes["width"] == "100"
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def test_layout_with_image(self):
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"""Test document layout with an image."""
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html = '<p>Text before</p><img src="test.png" width="100" height="75"><p>Text after</p>'
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root = parse_html(html)
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layout = DocumentLayout(root)
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# Mock the image loading by creating the images manually
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# This would normally happen in _collect_blocks
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# For now, just verify the structure is created
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lines = layout.layout(800)
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# Should have lines and potentially images
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assert isinstance(lines, list)
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def test_layout_image_class(self):
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"""Test LayoutImage class."""
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node = Element("img", {"src": "test.png"})
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image_layout = ImageLayout(node)
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image_layout.image = create_test_image(100, 100)
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image_layout.layout()
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layout_image = LayoutImage(image_layout, 10, 20)
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assert layout_image.x == 10
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assert layout_image.y == 20
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assert layout_image.width == 100
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assert layout_image.height == 100
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assert layout_image.image_layout is image_layout
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class TestImageIntegration:
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"""Integration tests for the complete image pipeline."""
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def test_html_with_data_url_image(self):
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"""Test parsing and layout of HTML with data URL image."""
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# 1x1 red PNG
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data_url = (
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"data:image/png;base64,"
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"iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mP8z8DwHwAFBQIAX8jx0gAAAABJRU5ErkJggg=="
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)
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html = f'<p>Before</p><img src="{data_url}" width="50" height="50"><p>After</p>'
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root = parse_html(html)
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# Verify structure
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body = root.children[0]
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# The img tag is self-closing, so the second p tag becomes a child of img
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# This is a quirk of the HTML parser treating img as a container
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assert len(body.children) >= 2
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assert body.children[0].tag == "p"
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assert body.children[1].tag == "img"
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def test_nested_image_in_paragraph(self):
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"""Test that images inside paragraphs are collected."""
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# 1x1 red PNG
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data_url = (
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"data:image/png;base64,"
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"iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mP8z8DwHwAFBQIAX8jx0gAAAABJRU5ErkJggg=="
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)
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html = f'<p>Text before <img src="{data_url}" width="50" height="50"> text after</p>'
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root = parse_html(html)
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# Create layout and verify images are collected
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layout = DocumentLayout(root)
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layout.layout(800)
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# Should have at least one image collected
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assert len(layout.images) >= 1
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def test_image_with_alt_text_placeholder(self):
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"""Test that failed images show placeholder with alt text."""
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html = '<img src="nonexistent.png" width="200" height="100" alt="Image failed">'
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root = parse_html(html)
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layout = DocumentLayout(root)
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layout.layout(800)
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# Should have image layout even though load failed
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assert len(layout.images) >= 1
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# Check alt text is set
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if layout.images:
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img = layout.images[0]
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assert img.image_layout.alt_text == "Image failed"
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class TestURLResolution:
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"""Test URL resolution for images."""
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def test_resolve_about_page_relative_url(self):
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"""Test resolving relative URLs for about: pages."""
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from src.network.images import _resolve_url, ASSETS_DIR
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# Relative URL from about:startpage should resolve to assets directory
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resolved = _resolve_url("../WebBowserLogo.jpeg", "about:startpage")
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# Should be an absolute path to the assets directory
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assert "WebBowserLogo.jpeg" in resolved
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assert str(ASSETS_DIR) in resolved or resolved.endswith("WebBowserLogo.jpeg")
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def test_resolve_http_relative_url(self):
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"""Test resolving relative URLs for HTTP pages."""
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from src.network.images import _resolve_url
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# Relative URL from HTTP page
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resolved = _resolve_url("images/photo.jpg", "https://example.com/page/index.html")
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assert resolved == "https://example.com/page/images/photo.jpg"
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def test_resolve_absolute_url(self):
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"""Test that absolute URLs are returned unchanged."""
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from src.network.images import _resolve_url
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url = "https://example.com/image.png"
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resolved = _resolve_url(url, "https://other.com/page.html")
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assert resolved == url
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def test_resolve_data_url(self):
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"""Test that data URLs are returned unchanged."""
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from src.network.images import _resolve_url
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url = "data:image/png;base64,abc123"
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resolved = _resolve_url(url, "https://example.com/")
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assert resolved == url
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