void SkConvertQuadToCubic(const SkPoint src[3], SkPoint dst[4])
{
SkScalar two = SkIntToScalar(2);
SkScalar one_third = SkScalarDiv(SK_Scalar1, SkIntToScalar(3));
dst[0].set(src[0].fX, src[0].fY);
dst[1].set(
SkScalarMul(SkScalarMulAdd(src[1].fX, two, src[0].fX), one_third),
SkScalarMul(SkScalarMulAdd(src[1].fY, two, src[0].fY), one_third));
dst[2].set(
SkScalarMul(SkScalarMulAdd(src[1].fX, two, src[2].fX), one_third),
SkScalarMul(SkScalarMulAdd(src[1].fY, two, src[2].fY), one_third));
dst[3].set(src[2].fX, src[2].fY);
}
static SkScalar eval_quad(const SkScalar src[], SkScalar t) {
SkASSERT(src);
SkASSERT(t >= 0 && t <= SK_Scalar1);
#ifdef DIRECT_EVAL_OF_POLYNOMIALS
SkScalar C = src[0];
SkScalar A = src[4] - 2 * src[2] + C;
SkScalar B = 2 * (src[2] - C);
return SkScalarMulAdd(SkScalarMulAdd(A, t, B), t, C);
#else
SkScalar ab = SkScalarInterp(src[0], src[2], t);
SkScalar bc = SkScalarInterp(src[2], src[4], t);
return SkScalarInterp(ab, bc, t);
#endif
}
virtual void performTest() {
SkPoint* dst = fDst;
const SkPoint* src = fSrc;
int count = fCount;
float mx = fMatrix[SkMatrix::kMScaleX];
float my = fMatrix[SkMatrix::kMScaleY];
float tx = fMatrix[SkMatrix::kMTransX];
float ty = fMatrix[SkMatrix::kMTransY];
do {
dst->fY = SkScalarMulAdd(src->fY, my, ty);
dst->fX = SkScalarMulAdd(src->fX, mx, tx);
src += 1;
dst += 1;
} while (--count);
}
static SkScalar eval_cubic_2ndDerivative(const SkScalar src[], SkScalar t)
{
SkScalar A = src[6] + 3*(src[2] - src[4]) - src[0];
SkScalar B = src[4] - 2 * src[2] + src[0];
return SkScalarMulAdd(A, t, B);
}
static SkScalar eval_quad_derivative(const SkScalar src[], SkScalar t)
{
SkScalar A = src[4] - 2 * src[2] + src[0];
SkScalar B = src[2] - src[0];
return 2 * SkScalarMulAdd(A, t, B);
}
static int winding_mono_quad(const SkPoint pts[], SkScalar x, SkScalar y) {
SkScalar y0 = pts[0].fY;
SkScalar y2 = pts[2].fY;
int dir = 1;
if (y0 > y2) {
SkTSwap(y0, y2);
dir = -1;
}
if (y < y0 || y >= y2) {
return 0;
}
// bounds check on X (not required, but maybe faster)
#if 0
if (pts[0].fX > x && pts[1].fX > x && pts[2].fX > x) {
return 0;
}
#endif
SkScalar roots[2];
int n = SkFindUnitQuadRoots(pts[0].fY - 2 * pts[1].fY + pts[2].fY,
2 * (pts[1].fY - pts[0].fY),
pts[0].fY - y,
roots);
SkASSERT(n <= 1);
SkScalar xt;
if (0 == n) {
SkScalar mid = SkScalarAve(y0, y2);
// Need [0] and [2] if dir == 1
// and [2] and [0] if dir == -1
xt = y < mid ? pts[1 - dir].fX : pts[dir - 1].fX;
} else {
SkScalar t = roots[0];
SkScalar C = pts[0].fX;
SkScalar A = pts[2].fX - 2 * pts[1].fX + C;
SkScalar B = 2 * (pts[1].fX - C);
xt = SkScalarMulAdd(SkScalarMulAdd(A, t, B), t, C);
}
return xt < x ? dir : 0;
}
static SkScalar eval_cubic(const SkScalar src[], SkScalar t) {
SkASSERT(src);
SkASSERT(t >= 0 && t <= SK_Scalar1);
if (t == 0) {
return src[0];
}
#ifdef DIRECT_EVAL_OF_POLYNOMIALS
SkScalar D = src[0];
SkScalar A = src[6] + 3*(src[2] - src[4]) - D;
SkScalar B = 3*(src[4] - src[2] - src[2] + D);
SkScalar C = 3*(src[2] - D);
return SkScalarMulAdd(SkScalarMulAdd(SkScalarMulAdd(A, t, B), t, C), t, D);
#else
SkScalar ab = SkScalarInterp(src[0], src[2], t);
SkScalar bc = SkScalarInterp(src[2], src[4], t);
SkScalar cd = SkScalarInterp(src[4], src[6], t);
SkScalar abc = SkScalarInterp(ab, bc, t);
SkScalar bcd = SkScalarInterp(bc, cd, t);
return SkScalarInterp(abc, bcd, t);
#endif
}
static SkScalar eval_cubic_coeff(SkScalar A, SkScalar B, SkScalar C,
SkScalar D, SkScalar t) {
return SkScalarMulAdd(SkScalarMulAdd(SkScalarMulAdd(A, t, B), t, C), t, D);
}
/** return At^2 + Bt + C
*/
static SkScalar eval_quadratic(SkScalar A, SkScalar B, SkScalar C, SkScalar t) {
SkASSERT(t >= 0 && t <= SK_Scalar1);
return SkScalarMulAdd(SkScalarMulAdd(A, t, B), t, C);
}
void SkPDFDevice::drawText(const SkDraw& d, const void* text, size_t len,
SkScalar x, SkScalar y, const SkPaint& paint) {
SkPaint textPaint = calculateTextPaint(paint);
updateGSFromPaint(textPaint, true);
// We want the text in glyph id encoding and a writable buffer, so we end
// up making a copy either way.
size_t numGlyphs = paint.textToGlyphs(text, len, NULL);
uint16_t* glyphIDs =
(uint16_t*)sk_malloc_flags(numGlyphs * 2,
SK_MALLOC_TEMP | SK_MALLOC_THROW);
SkAutoFree autoFreeGlyphIDs(glyphIDs);
if (paint.getTextEncoding() != SkPaint::kGlyphID_TextEncoding) {
paint.textToGlyphs(text, len, glyphIDs);
textPaint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
} else {
SkASSERT((len & 1) == 0);
SkASSERT(len / 2 == numGlyphs);
memcpy(glyphIDs, text, len);
}
SkScalar width;
SkScalar* widthPtr = NULL;
if (textPaint.isUnderlineText() || textPaint.isStrikeThruText())
widthPtr = &width;
SkDrawCacheProc glyphCacheProc = textPaint.getDrawCacheProc();
alignText(glyphCacheProc, textPaint, glyphIDs, numGlyphs, &x, &y, widthPtr);
fContent.writeText("BT\n");
setTextTransform(x, y, textPaint.getTextSkewX());
size_t consumedGlyphCount = 0;
while (numGlyphs > consumedGlyphCount) {
updateFont(textPaint, glyphIDs[consumedGlyphCount]);
SkPDFFont* font = fGraphicStack[fGraphicStackIndex].fFont;
size_t availableGlyphs =
font->glyphsToPDFFontEncoding(glyphIDs + consumedGlyphCount,
numGlyphs - consumedGlyphCount);
SkString encodedString =
SkPDFString::formatString(glyphIDs + consumedGlyphCount,
availableGlyphs, font->multiByteGlyphs());
fContent.writeText(encodedString.c_str());
consumedGlyphCount += availableGlyphs;
fContent.writeText(" Tj\n");
}
fContent.writeText("ET\n");
// Draw underline and/or strikethrough if the paint has them.
// drawPosText() and drawTextOnPath() don't draw underline or strikethrough
// because the raster versions don't. Use paint instead of textPaint
// because we may have changed strokeWidth to do fakeBold text.
if (paint.isUnderlineText() || paint.isStrikeThruText()) {
SkScalar textSize = paint.getTextSize();
SkScalar height = SkScalarMul(textSize, kStdUnderline_Thickness);
if (paint.isUnderlineText()) {
SkScalar top = SkScalarMulAdd(textSize, kStdUnderline_Offset, y);
SkRect r = SkRect::MakeXYWH(x, top - height, width, height);
drawRect(d, r, paint);
}
if (paint.isStrikeThruText()) {
SkScalar top = SkScalarMulAdd(textSize, kStdStrikeThru_Offset, y);
SkRect r = SkRect::MakeXYWH(x, top - height, width, height);
drawRect(d, r, paint);
}
}
}
