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Diffstat (limited to 'src/img/painter.nim')
| -rw-r--r-- | src/img/painter.nim | 211 |
1 files changed, 0 insertions, 211 deletions
diff --git a/src/img/painter.nim b/src/img/painter.nim deleted file mode 100644 index 40f2c79a..00000000 --- a/src/img/painter.nim +++ /dev/null @@ -1,211 +0,0 @@ -import std/algorithm - -import img/bitmap -import img/path -import types/color -import types/line -import types/vector -import utils/twtuni - -type - CanvasFillRule* = enum - cfrNonZero = "nonzero" - cfrEvenOdd = "evenodd" - - PaintCommand* = enum - pcSetDimensions, pcFillRect, pcStrokeRect, pcFillPath, pcStrokePath, - pcFillText, pcStrokeText - - CanvasTextAlign* = enum - ctaStart = "start" - ctaEnd = "end" - ctaLeft = "left" - ctaRight = "right" - ctaCenter = "center" - -# https://en.wikipedia.org/wiki/Bresenham's_line_algorithm#All_cases -proc plotLineLow(bmp: Bitmap; x1, y1, x2, y2: int; color: ARGBColor) = - var dx = x2 - x1 - var dy = y2 - y1 - var yi = 1 - if dy < 0: - yi = -1 - dy = -dy - var D = 2 * dy - dx; - var y = y1; - for x in x1 ..< x2: - if x < 0 or y < 0 or x >= bmp.width or y >= bmp.height: - break - bmp.setpxb(x, y, color) - if D > 0: - y = y + yi; - D = D - 2 * dx; - D = D + 2 * dy; - -proc plotLineHigh(bmp: Bitmap; x1, y1, x2, y2: int; color: ARGBColor) = - var dx = x2 - x1 - var dy = y2 - y1 - var xi = 1 - if dx < 0: - xi = -1 - dx = -dx - var D = 2 * dx - dy - var x = x1 - for y in y1 ..< y2: - if x < 0 or y < 0 or x >= bmp.width or y >= bmp.height: - break - bmp.setpxb(x, y, color) - if D > 0: - x = x + xi - D = D - 2 * dy - D = D + 2 * dx - -proc plotLine(bmp: Bitmap; x1, y1, x2, y2: int; color: ARGBColor) = - if abs(y2 - y1) < abs(x2 - x1): - if x1 > x2: - bmp.plotLineLow(x2, y2, x1, y1, color) - else: - bmp.plotLineLow(x1, y1, x2, y2, color) - else: - if y1 > y2: - bmp.plotLineHigh(x2, y2, x1, y1, color) - else: - bmp.plotLineHigh(x1, y1, x2, y2, color) - -proc plotLine(bmp: Bitmap; a, b: Vector2D; color: ARGBColor) = - bmp.plotLine(int(a.x), int(a.y), int(b.x), int(b.y), color) - -proc plotLine(bmp: Bitmap; line: Line; color: ARGBColor) = - bmp.plotLine(line.p0, line.p1, color) - -proc strokePath*(bmp: Bitmap; lines: seq[Line]; color: ARGBColor) = - for line in lines: - bmp.plotLine(line, color) - -func isInside(windingNumber: int; fillRule: CanvasFillRule): bool = - return case fillRule - of cfrNonZero: windingNumber != 0 - of cfrEvenOdd: windingNumber mod 2 == 0 - -# Algorithm originally from SerenityOS. -proc fillPath*(bmp: Bitmap; lines: PathLines; color: ARGBColor; - fillRule: CanvasFillRule) = - var i = 0 - var ylines: seq[LineSegment] = @[] - for y in int(lines.miny) .. int(lines.maxy): - for k in countdown(ylines.high, 0): - if ylines[k].maxy < float64(y): - ylines.del(k) # we'll sort anyways, so del is fine - for j in i ..< lines.len: - if lines[j].miny > float64(y): - break - if lines[j].maxy > float64(y): - ylines.add(lines[j]) - inc i - ylines.sort(cmpLineSegmentX) - var w = if fillRule == cfrNonZero: 1 else: 0 - for k in 0 ..< ylines.high: - let a = ylines[k] - let b = ylines[k + 1] - let sx = int(a.minyx) - let ex = int(b.minyx) - if w.isInside(fillRule) and y > 0: - for x in sx .. ex: - if x > 0: - bmp.setpxb(x, y, color) - if int(a.p0.y) != y and int(a.p1.y) != y and int(b.p0.y) != y and - int(b.p1.y) != y and sx != ex or a.islope * b.islope < 0: - case fillRule - of cfrEvenOdd: inc w - of cfrNonZero: - if a.p0.y < a.p1.y: - inc w - else: - dec w - ylines[k].minyx += ylines[k].islope - if ylines.len > 0: - ylines[^1].minyx += ylines[^1].islope - -proc fillRect*(bmp: Bitmap; x1, y1, x2, y2: int; color: ARGBColor) = - for y in y1 ..< y2: - for x in x1 ..< x2: - bmp.setpxb(x, y, color) - -proc strokeRect*(bmp: Bitmap; x1, y1, x2, y2: int; color: ARGBColor) = - for x in x1 ..< x2: - bmp.setpxb(x, y1, color) - bmp.setpxb(x, y2, color) - for y in y1 ..< y2: - bmp.setpxb(x1, y, color) - bmp.setpxb(x2, y, color) - -type GlyphCacheItem = object - u: uint32 - bmp: Bitmap - -var unifontBitmap*: Bitmap = nil -var glyphCache: seq[GlyphCacheItem] = @[] -var glyphCacheI = 0 -proc getCharBmp(u: uint32): Bitmap = - # We only have the BMP. - let u = if u <= 0xFFFF: u else: 0xFFFD - for it in glyphCache: - if it.u == u: - return it.bmp - # Unifont glyphs start at x: 32, y: 64, and are of 8x16/16x16 size - let gx = int(32 + 16 * (u mod 0x100)) - let gy = int(64 + 16 * (u div 0x100)) - var fullwidth = false - const white = rgba_be(255, 255, 255, 255) - block loop: - # hack to recognize full width characters - for y in 0 ..< 16: - for x in 8 ..< 16: - if unifontBitmap.getpx(gx + x, gy + y) != white: - fullwidth = true - break loop - let bmp = newBitmap(if fullwidth: 16 else: 8, 16) - for y in 0 ..< bmp.height: - for x in 0 ..< bmp.width: - let c = unifontBitmap.getpx(gx + x, gy + y) - if c != white: - bmp.setpx(x, y, c) - if glyphCache.len < 256: - glyphCache.add(GlyphCacheItem(u: u, bmp: bmp)) - else: - glyphCache[glyphCacheI] = GlyphCacheItem(u: u, bmp: bmp) - inc glyphCacheI - if glyphCacheI >= glyphCache.len: - glyphCacheI = 0 - return bmp - -proc drawBitmap(a, b: Bitmap; p: Vector2D) = - for y in 0 ..< b.height: - for x in 0 ..< b.width: - let ax = int(p.x) + x - let ay = int(p.y) + y - if ax >= 0 and ay >= y and ax < a.width and ay < a.height: - a.setpxb(ax, ay, b.getpx(x, y)) - -proc fillText*(bmp: Bitmap; text: string; x, y: float64; color: ARGBColor; - textAlign: CanvasTextAlign) = - var w = 0f64 - var glyphs: seq[Bitmap] = @[] - for u in text.points: - let glyph = getCharBmp(u) - glyphs.add(glyph) - w += float64(glyph.width) - var x = x - #TODO rtl - case textAlign - of ctaLeft, ctaStart: discard - of ctaRight, ctaEnd: x -= w - of ctaCenter: x -= w / 2 - for glyph in glyphs: - bmp.drawBitmap(glyph, Vector2D(x: x, y: y - 8)) - x += float64(glyph.width) - -proc strokeText*(bmp: Bitmap; text: string; x, y: float64; color: ARGBColor; - textAlign: CanvasTextAlign) = - #TODO - bmp.fillText(text, x, y, color, textAlign) |