Changelog

0.3.0.0

Bug Fixes

• Fix drawEllipse midpoint algorithm: region 2 now continues from where region 1 ended instead of restarting at (rx, 0). Ellipses now correctly plot all four cardinal edge pixels.
• Fix safeSetPixel in VFX.hs: use setPixel directly instead of fillCircle with radius 0.
• Replace partial minimum/maximum with safe folds in fillPolygon (Draw.hs) and computeMaxWidth (Sheet.hs).
• Fix grayscale4 palette: was a duplicate of gameboy (green-tinted). Now uses evenly-spaced true grayscale (0, 85, 170, 255).

Performance

• Replace 16 lazy foldl with strict foldl' across Draw.hs, VFX.hs, Sheet.hs, Tilemap.hs, and Text.hs.

Internal

• 356 tests (up from 105): comprehensive coverage of all modules.
• CI and cabal: tested-with upgraded from GHC 9.6 to GHC 9.8.
• Publish workflow: replace sed version-patching with tag/cabal version verification.

0.2.1.2

• Change license from MIT to BSD-3-Clause.

Bug Fixes

• Fix maximum crash on empty list in packSheet (Sheet.hs).
• Replace partial !! with safe indexing in Bayer dithering (Dither.hs).
• Fix -Wname-shadowing warning in test suite.

Documentation

• Fix README Animation API section (wrong type name and signatures).
• Add gb-vector as ecosystem companion in README.

Internal

• CI: cross-platform build matrix (Linux, macOS, Windows).

0.2.1.1

• Remove unused containers dependency.

0.2.1.0

Performance

Library-wide elimination of O(n²) per-pixel setPixel/VS.// mutation. All pixel-producing functions now use single-pass VS.generate for O(n) performance.

• NineSlice: renderNineSlice — rewritten for large target sizes that previously stalled.
• Transform: flipH, flipV, rotate90, rotate180, rotate270, scaleNearest, outline, dropShadow — all rewritten with direct index computation.
• Compose: stamp, stampAlpha — single-pass with inline source/destination byte reads.
• Gradient: linearGradient, radialGradient, diagonalGradient — generate directly from coordinate math.
• Noise: valueNoiseColor, fbm — generate noise samples directly into output vector.
• Dither: orderedDither — single-pass palette reduction.

0.2.0.0

New Modules

• GBSprite.Noise: Procedural noise generation — valueNoise, valueNoiseColor, fbm (fractal Brownian motion). Deterministic LCG with bilinear interpolation and smoothstep.
• GBSprite.Gradient: Gradient generation — linearGradient (horizontal/vertical), radialGradient, diagonalGradient.
• GBSprite.NineSlice: UI panel scaling — NineSlice type with configurable border regions, renderNineSlice preserves corners and edges at any target size.
• GBSprite.Dither: Ordered dithering — orderedDither with Bayer2, Bayer4, Bayer8 matrices for palette reduction. Classic retro cross-hatch patterns.
• GBSprite.Export.PNG: Separated from Export.hs, eliminating CPP. Only built when juicy-pixels flag is enabled.

Bug Fixes

• Eliminate CPP from Export.hs — split into GBSprite.Export (BMP, always available) and GBSprite.Export.PNG (optional).

Internal

• 105 pure tests (up from 62)
• 12 new Draw function tests (drawThickLine, drawPolygon, fillPolygon, drawEllipse, fillEllipse, drawBezier, drawRoundRect, fillRoundRect)
• CI: ormolu glob src/**/*.hs replaces hardcoded file list
• CI: jobs chained so lint/format gate build (saves Actions minutes on failure)
• Metadata: cabal-version 3.0, stability experimental, CHANGELOG.md

0.1.0.0

Initial release.

Canvas & Color

• Canvas type: width, height, RGBA pixel vector
• Color type with lerp, multiply, alphaBlend, withAlpha, scaleAlpha
• Bounds-checked getPixel / setPixel (out-of-bounds returns transparent)

Drawing Primitives

• Lines: drawLine, drawThickLine
• Rectangles: drawRect, fillRect, drawRoundRect, fillRoundRect
• Circles: drawCircle, fillCircle
• Ellipses: drawEllipse, fillEllipse
• Polygons: drawPolygon, fillPolygon
• Curves: drawBezier, drawArc

Transforms

• flipH, flipV, rotate90, rotate180, rotate270
• scaleNearest: nearest-neighbour scaling

Composition

• stamp: blit with transparency
• overlay: layer multiple canvases

Animation

• Animation type with Loop, Once, PingPong modes
• Frame indexing with animationDone predicate

Sprites & Sheets

• Sprite type: multi-frame sprite container
• packSheet: bin-packing sprite sheet atlas

Text

• renderText: bitmap font text rendering
• textWidth: measure text width in pixels

VFX

• explosion: animated explosion effect
• ring: expanding ring effect
• flash: screen flash frames

Palettes

• Palette type with indexed color lookup
• paletteSwap: remap colors
• Built-in: gameboy (4-color Game Boy palette)

Export

• exportBmp: native BMP file export (always available)
• exportPng: PNG export via JuicyPixels (optional juicy-pixels flag)