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feat(字体渲染): 加强字体渲染能力

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xiaoqidun
2026-07-02 13:03:30 +08:00
parent 7488406b27
commit 75c9c17d1d
2 changed files with 63 additions and 21 deletions
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ofdgo_font_ttf.go
+25 -1
View File
@@ -225,15 +225,39 @@ func hasUsableCmap(data []byte) bool {
}
numTables := binary.BigEndian.Uint16(data[2:4])
pos := 4
usable := false
for i := 0; i < int(numTables); i++ {
if len(data) < pos+8 {
break
}
platformID := binary.BigEndian.Uint16(data[pos : pos+2])
encodingID := binary.BigEndian.Uint16(data[pos+2 : pos+4])
offset := binary.BigEndian.Uint32(data[pos+4 : pos+8])
if uint32(len(data)) < offset+2 {
return false
}
format := binary.BigEndian.Uint16(data[offset : offset+2])
if !supportedCmapFormat(format, platformID, encodingID) {
return false
}
if platformID == 0 || platformID == 3 {
return true
usable = true
}
pos += 8
}
return usable
}
// supportedCmapFormat 判断 cmap 子表格式是否可用
// 入参: format cmap 子表格式, platformID 平台ID, encodingID 编码ID
// 返回: bool 是否可用
func supportedCmapFormat(format, platformID, encodingID uint16) bool {
switch format {
case 0, 4, 6, 12:
return true
case 14:
return platformID == 0 && encodingID == 5
default:
return false
}
}
ofdgo_renderer.go
+31 -13
View File
@@ -299,13 +299,13 @@ func (r *Renderer) renderLayer(ctx *canvas.Context, layer Layer, pageH float64,
return
}
for _, textObj := range layer.TextObject {
r.renderText(ctx, textObj, pageH, defaultFill, defaultStroke, parentCTM)
r.renderText(ctx, textObj, pageH, defaultFill, defaultStroke, parentCTM, false)
}
for _, pathObj := range layer.PathObject {
r.renderPath(ctx, pathObj, pageH, defaultFill, defaultStroke, defaultLW, parentCTM, false)
}
for _, imgObj := range layer.ImageObject {
r.renderImage(ctx, imgObj, pageH, parentCTM)
r.renderImage(ctx, imgObj, pageH, parentCTM, false)
}
for _, cgu := range layer.CompositeGraphicUnit {
r.renderCompositeGraphicUnit(ctx, cgu, pageH, defaultFill, defaultStroke, defaultLW, parentCTM, false)
@@ -353,7 +353,7 @@ func (r *Renderer) renderCompositeGraphicUnit(ctx *canvas.Context, cgu Composite
}
for _, imgObj := range cgu.ImageObject {
imgObj.Alpha = mergeAlpha(imgObj.Alpha, cgu.Alpha)
r.renderImage(ctx, imgObj, pageH, &currentCTM)
r.renderImage(ctx, imgObj, pageH, &currentCTM, boundaryInCTM)
}
for _, pathObj := range cgu.PathObject {
pathObj.Alpha = mergeAlpha(pathObj.Alpha, cgu.Alpha)
@@ -361,7 +361,7 @@ func (r *Renderer) renderCompositeGraphicUnit(ctx *canvas.Context, cgu Composite
}
for _, textObj := range cgu.TextObject {
textObj.Alpha = mergeAlpha(textObj.Alpha, cgu.Alpha)
r.renderText(ctx, textObj, pageH, defaultFill, defaultStroke, &currentCTM)
r.renderText(ctx, textObj, pageH, defaultFill, defaultStroke, &currentCTM, boundaryInCTM)
}
for _, subCgu := range cgu.CompositeGraphicUnit {
subCgu.Alpha = mergeAlpha(subCgu.Alpha, cgu.Alpha)
@@ -375,11 +375,11 @@ func (r *Renderer) renderCompositeGraphicUnit(ctx *canvas.Context, cgu Composite
func (r *Renderer) renderObject(ctx *canvas.Context, obj GraphicObject, pageH float64, defaultFill, defaultStroke color.Color, defaultLW float64, parentCTM *Matrix, boundaryInCTM bool) {
switch obj.Type {
case "TextObject":
r.renderText(ctx, obj.TextObject, pageH, defaultFill, defaultStroke, parentCTM)
r.renderText(ctx, obj.TextObject, pageH, defaultFill, defaultStroke, parentCTM, boundaryInCTM)
case "PathObject":
r.renderPath(ctx, obj.PathObject, pageH, defaultFill, defaultStroke, defaultLW, parentCTM, boundaryInCTM)
case "ImageObject":
r.renderImage(ctx, obj.ImageObject, pageH, parentCTM)
r.renderImage(ctx, obj.ImageObject, pageH, parentCTM, boundaryInCTM)
case "CompositeGraphicUnit", "CompositeObject":
r.renderCompositeGraphicUnit(ctx, obj.CompositeGraphicUnit, pageH, defaultFill, defaultStroke, defaultLW, parentCTM, boundaryInCTM)
}
@@ -471,8 +471,8 @@ func (r *Renderer) initCommon() {
}
// renderImage 渲染图片
// 入参: ctx 画布上下文, obj 图片对象, pageH 页面高度, parentCTM 父级CTM
func (r *Renderer) renderImage(ctx *canvas.Context, obj ImageObject, pageH float64, parentCTM *Matrix) {
// 入参: ctx 画布上下文, obj 图片对象, pageH 页面高度, parentCTM 父级CTM, boundaryInCTM 边界是否参与父级CTM
func (r *Renderer) renderImage(ctx *canvas.Context, obj ImageObject, pageH float64, parentCTM *Matrix, boundaryInCTM bool) {
if obj.Visible != nil && !*obj.Visible {
return
}
@@ -501,13 +501,23 @@ func (r *Renderer) renderImage(ctx *canvas.Context, obj ImageObject, pageH float
if obj.CTM == "" {
ctm = Matrix{a: box.W, d: box.H}
}
var m canvas.Matrix
if boundaryInCTM && parentCTM != nil {
x0 := box.X + ctm.c + ctm.e
y0 := box.Y + ctm.d + ctm.f
m = canvas.Matrix{
{(parentCTM.a*ctm.a + parentCTM.c*ctm.b) / imgW, -(parentCTM.a*ctm.c + parentCTM.c*ctm.d) / imgH, parentCTM.a*x0 + parentCTM.c*y0 + parentCTM.e},
{-(parentCTM.b*ctm.a + parentCTM.d*ctm.b) / imgW, (parentCTM.b*ctm.c + parentCTM.d*ctm.d) / imgH, pageH - (parentCTM.b*x0 + parentCTM.d*y0 + parentCTM.f)},
}
} else {
if parentCTM != nil {
ctm = parentCTM.Multiply(ctm)
}
m := canvas.Matrix{
m = canvas.Matrix{
{ctm.a / imgW, -ctm.c / imgH, box.X + ctm.c + ctm.e},
{-ctm.b / imgW, ctm.d / imgH, pageH - box.Y - ctm.d - ctm.f},
}
}
if pad > 0 {
p := float64(pad)
m[0][2] -= m[0][0]*p + m[0][1]*p
@@ -868,8 +878,8 @@ func patternColor(fillColor *FillColor) color.Color {
}
// renderText 渲染文本
// 入参: ctx 画布上下文, obj 文本对象, pageH 页面高度, defaultFill 默认填充色, defaultStroke 默认描边色, parentCTM 父级CTM
func (r *Renderer) renderText(ctx *canvas.Context, obj TextObject, pageH float64, defaultFill, defaultStroke color.Color, parentCTM *Matrix) {
// 入参: ctx 画布上下文, obj 文本对象, pageH 页面高度, defaultFill 默认填充色, defaultStroke 默认描边色, parentCTM 父级CTM, boundaryInCTM 边界是否参与父级CTM
func (r *Renderer) renderText(ctx *canvas.Context, obj TextObject, pageH float64, defaultFill, defaultStroke color.Color, parentCTM *Matrix, boundaryInCTM bool) {
if obj.Visible != nil && !*obj.Visible {
return
}
@@ -880,7 +890,8 @@ func (r *Renderer) renderText(ctx *canvas.Context, obj TextObject, pageH float64
bx, by = box.X, box.Y
}
}
ctm := NewMatrix(obj.CTM)
localCTM := NewMatrix(obj.CTM)
ctm := localCTM
if parentCTM != nil {
ctm = parentCTM.Multiply(ctm)
}
@@ -1002,8 +1013,15 @@ func (r *Renderer) renderText(ctx *canvas.Context, obj TextObject, pageH float64
cy += dy
}
}
var canvasX, canvasY float64
if boundaryInCTM && parentCTM != nil {
tx, ty := localCTM.Transform(cx, cy)
tx, ty = parentCTM.Transform(tx+bx, ty+by)
canvasX, canvasY = tx, pageH-ty
} else {
tx, ty := ctm.Transform(cx, cy)
canvasX, canvasY := tx+bx, pageH-(ty+by)
canvasX, canvasY = tx+bx, pageH-(ty+by)
}
textWidth := face.TextWidth(str) * hScale
glyphFillPaint := fillPaint
if fillColorNode != nil && fillColorNode.AxialShd != nil {