| /* |
| * Copyright 2013 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "SkBitmapProcState.h" |
| #include "SkBitmap.h" |
| #include "SkColor.h" |
| #include "SkColorPriv.h" |
| #include "SkUnPreMultiply.h" |
| #include "SkShader.h" |
| #include "SkRTConf.h" |
| #include "SkMath.h" |
| |
| void highQualityFilter(const SkBitmapProcState& s, int x, int y, |
| SkPMColor* SK_RESTRICT colors, int count) { |
| |
| const int maxX = s.fBitmap->width() - 1; |
| const int maxY = s.fBitmap->height() - 1; |
| |
| while (count-- > 0) { |
| SkPoint srcPt; |
| s.fInvProc(*s.fInvMatrix, SkIntToScalar(x), |
| SkIntToScalar(y), &srcPt); |
| srcPt.fX -= SK_ScalarHalf; |
| srcPt.fY -= SK_ScalarHalf; |
| |
| int sx = SkScalarFloorToInt(srcPt.fX); |
| int sy = SkScalarFloorToInt(srcPt.fY); |
| |
| SkFixed weight = 0; |
| SkFixed fr = 0, fg = 0, fb = 0, fa = 0; |
| |
| int y0 = SkClampMax(int(ceil(sy-s.getBitmapFilter()->width() + 0.5f)), maxY); |
| int y1 = SkClampMax(int(floor(sy+s.getBitmapFilter()->width() + 0.5f)), maxY); |
| int x0 = SkClampMax(int(ceil(sx-s.getBitmapFilter()->width() + 0.5f)), maxX); |
| int x1 = SkClampMax(int(floor(sx+s.getBitmapFilter()->width() + 0.5f)), maxX); |
| |
| for (int src_y = y0; src_y <= y1; src_y++) { |
| SkFixed yweight = s.getBitmapFilter()->lookup((srcPt.fY - src_y)); |
| |
| for (int src_x = x0; src_x <= x1 ; src_x++) { |
| SkFixed xweight = s.getBitmapFilter()->lookup((srcPt.fX - src_x)); |
| |
| SkFixed combined_weight = SkFixedMul(xweight, yweight); |
| |
| SkPMColor c = *s.fBitmap->getAddr32(src_x, src_y); |
| fr += combined_weight * SkGetPackedR32(c); |
| fg += combined_weight * SkGetPackedG32(c); |
| fb += combined_weight * SkGetPackedB32(c); |
| fa += combined_weight * SkGetPackedA32(c); |
| weight += combined_weight; |
| } |
| } |
| |
| fr = SkFixedDiv(fr, weight); |
| fg = SkFixedDiv(fg, weight); |
| fb = SkFixedDiv(fb, weight); |
| fa = SkFixedDiv(fa, weight); |
| |
| int a = SkClampMax(SkFixedRoundToInt(fa), 255); |
| int r = SkClampMax(SkFixedRoundToInt(fr), a); |
| int g = SkClampMax(SkFixedRoundToInt(fg), a); |
| int b = SkClampMax(SkFixedRoundToInt(fb), a); |
| |
| *colors++ = SkPackARGB32(a, r, g, b); |
| |
| x++; |
| } |
| } |
| |
| void highQualityFilter_ScaleOnly(const SkBitmapProcState &s, int x, int y, |
| SkPMColor *SK_RESTRICT colors, int count) { |
| const int maxX = s.fBitmap->width() - 1; |
| const int maxY = s.fBitmap->height() - 1; |
| |
| SkPoint srcPt; |
| |
| s.fInvProc(*s.fInvMatrix, SkIntToScalar(x), |
| SkIntToScalar(y), &srcPt); |
| srcPt.fY -= SK_ScalarHalf; |
| int sy = SkScalarFloorToInt(srcPt.fY); |
| int y0 = SkClampMax(int(ceil(sy-s.getBitmapFilter()->width() + 0.5f)), maxY); |
| int y1 = SkClampMax(int(floor(sy+s.getBitmapFilter()->width() + 0.5f)), maxY); |
| |
| while (count-- > 0) { |
| s.fInvProc(*s.fInvMatrix, SkIntToScalar(x), |
| SkIntToScalar(y), &srcPt); |
| srcPt.fX -= SK_ScalarHalf; |
| srcPt.fY -= SK_ScalarHalf; |
| |
| int sx = SkScalarFloorToInt(srcPt.fX); |
| |
| SkFixed weight = 0; |
| SkFixed fr = 0, fg = 0, fb = 0, fa = 0; |
| |
| int x0 = SkClampMax(int(ceil(sx-s.getBitmapFilter()->width() + 0.5f)), maxX); |
| int x1 = SkClampMax(int(floor(sx+s.getBitmapFilter()->width() + 0.5f)), maxX); |
| |
| for (int src_y = y0; src_y <= y1; src_y++) { |
| SkFixed yweight = s.getBitmapFilter()->lookup((srcPt.fY - src_y)); |
| |
| for (int src_x = x0; src_x <= x1 ; src_x++) { |
| SkFixed xweight = s.getBitmapFilter()->lookup((srcPt.fX - src_x)); |
| |
| SkFixed combined_weight = SkFixedMul(xweight, yweight); |
| |
| SkPMColor c = *s.fBitmap->getAddr32(src_x, src_y); |
| fr += combined_weight * SkGetPackedR32(c); |
| fg += combined_weight * SkGetPackedG32(c); |
| fb += combined_weight * SkGetPackedB32(c); |
| fa += combined_weight * SkGetPackedA32(c); |
| weight += combined_weight; |
| } |
| } |
| |
| fr = SkFixedDiv(fr, weight); |
| fg = SkFixedDiv(fg, weight); |
| fb = SkFixedDiv(fb, weight); |
| fa = SkFixedDiv(fa, weight); |
| |
| int a = SkClampMax(SkFixedRoundToInt(fa), 255); |
| int r = SkClampMax(SkFixedRoundToInt(fr), a); |
| int g = SkClampMax(SkFixedRoundToInt(fg), a); |
| int b = SkClampMax(SkFixedRoundToInt(fb), a); |
| |
| *colors++ = SkPackARGB32(a, r, g, b); |
| |
| x++; |
| } |
| } |
| |
| SK_CONF_DECLARE(const char *, c_bitmapFilter, "bitmap.filter", "mitchell", "Which bitmap filter to use [mitchell, sinc, gaussian, triangle, box]"); |
| |
| static SkBitmapFilter *allocateBitmapFilter() { |
| if (!strcmp(c_bitmapFilter, "mitchell")) { |
| return SkNEW_ARGS(SkMitchellFilter,(1.f/3.f,1.f/3.f)); |
| } else if (!strcmp(c_bitmapFilter, "sinc")) { |
| return SkNEW_ARGS(SkSincFilter,(3)); |
| } else if (!strcmp(c_bitmapFilter, "gaussian")) { |
| return SkNEW_ARGS(SkGaussianFilter,(2)); |
| } else if (!strcmp(c_bitmapFilter, "triangle")) { |
| return SkNEW(SkTriangleFilter); |
| } else if (!strcmp(c_bitmapFilter, "box")) { |
| return SkNEW(SkBoxFilter); |
| } else { |
| SkASSERT(!!!"Unknown filter type"); |
| } |
| |
| return NULL; |
| } |
| |
| SkBitmapProcState::ShaderProc32 |
| SkBitmapProcState::chooseBitmapFilterProc(const SkPaint& paint) { |
| // we need to be requested |
| uint32_t mask = SkPaint::kFilterBitmap_Flag |
| | SkPaint::kHighQualityFilterBitmap_Flag |
| ; |
| if ((paint.getFlags() & mask) != mask) { |
| return NULL; |
| } |
| |
| // TODO: consider supporting other configs (e.g. 565, A8) |
| if (fBitmap->config() != SkBitmap::kARGB_8888_Config) { |
| return NULL; |
| } |
| |
| // TODO: consider supporting repeat and mirror |
| if (SkShader::kClamp_TileMode != fTileModeX || SkShader::kClamp_TileMode != fTileModeY) { |
| return NULL; |
| } |
| |
| // TODO: support blending inside our procs |
| if (0xFF != paint.getAlpha()) { |
| return NULL; |
| } |
| |
| if (fInvType & (SkMatrix::kAffine_Mask | SkMatrix::kScale_Mask)) { |
| fBitmapFilter = allocateBitmapFilter(); |
| } |
| |
| if (fInvType & SkMatrix::kAffine_Mask) { |
| return highQualityFilter; |
| } else if (fInvType & SkMatrix::kScale_Mask) { |
| return highQualityFilter_ScaleOnly; |
| } else { |
| return NULL; |
| } |
| } |
| |
| static void divideByWeights(SkFixed *sums, SkFixed *weights, SkBitmap *dst) { |
| for (int y = 0 ; y < dst->height() ; y++) { |
| for (int x = 0 ; x < dst->width() ; x++) { |
| SkFixed fr = SkFixedDiv(sums[4*(y*dst->width() + x) + 0], weights[y*dst->width() + x]); |
| SkFixed fg = SkFixedDiv(sums[4*(y*dst->width() + x) + 1], weights[y*dst->width() + x]); |
| SkFixed fb = SkFixedDiv(sums[4*(y*dst->width() + x) + 2], weights[y*dst->width() + x]); |
| SkFixed fa = SkFixedDiv(sums[4*(y*dst->width() + x) + 3], weights[y*dst->width() + x]); |
| int a = SkClampMax(SkFixedRoundToInt(fa), 255); |
| int r = SkClampMax(SkFixedRoundToInt(fr), a); |
| int g = SkClampMax(SkFixedRoundToInt(fg), a); |
| int b = SkClampMax(SkFixedRoundToInt(fb), a); |
| |
| *dst->getAddr32(x,y) = SkPackARGB32(a, r, g, b); |
| } |
| } |
| } |
| |
| static void upScaleHoriz(const SkBitmap *src, SkBitmap *dst, float scale, SkBitmapFilter *filter) { |
| for (int y = 0 ; y < src->height() ; y++) { |
| for (int x = 0 ; x < dst->width() ; x++) { |
| float sx = x / scale - 0.5f; |
| int x0 = SkClampMax(int(ceil(sx-filter->width() + 0.5f)), src->width()-1); |
| int x1 = SkClampMax(int(floor(sx+filter->width() + 0.5f)), src->width()-1); |
| |
| SkFixed total_weight = 0; |
| SkFixed fr = 0, fg = 0, fb = 0, fa = 0; |
| |
| for (int src_x = x0 ; src_x <= x1 ; src_x++) { |
| SkFixed weight = filter->lookup(sx - src_x); |
| SkPMColor c = *src->getAddr32(src_x,y); |
| fr += weight * SkGetPackedR32(c); |
| fg += weight * SkGetPackedG32(c); |
| fb += weight * SkGetPackedB32(c); |
| fa += weight * SkGetPackedA32(c); |
| total_weight += weight; |
| } |
| fr = SkFixedDiv(fr, total_weight); |
| fg = SkFixedDiv(fg, total_weight); |
| fb = SkFixedDiv(fb, total_weight); |
| fa = SkFixedDiv(fa, total_weight); |
| |
| int a = SkClampMax(SkFixedRoundToInt(fa), 255); |
| int r = SkClampMax(SkFixedRoundToInt(fr), a); |
| int g = SkClampMax(SkFixedRoundToInt(fg), a); |
| int b = SkClampMax(SkFixedRoundToInt(fb), a); |
| |
| *dst->getAddr32(x,y) = SkPackARGB32(a, r, g, b); |
| } |
| } |
| } |
| |
| static void downScaleHoriz(const SkBitmap *src, SkBitmap *dst, float scale, SkBitmapFilter *filter) { |
| SkFixed *sums = SkNEW_ARRAY(SkFixed, dst->width() * dst->height() * 4); |
| SkFixed *weights = SkNEW_ARRAY(SkFixed, dst->width() * dst->height()); |
| |
| SkAutoTDeleteArray<SkFixed> ada1(sums); |
| SkAutoTDeleteArray<SkFixed> ada2(weights); |
| |
| memset(sums, 0, dst->width() * dst->height() * sizeof(SkFixed) * 4); |
| memset(weights, 0, dst->width() * dst->height() * sizeof(SkFixed)); |
| |
| for (int y = 0 ; y < src->height() ; y++) { |
| for (int x = 0 ; x < src->width() ; x++) { |
| // splat each source pixel into the destination image |
| float dx = (x + 0.5f) * scale; |
| int x0 = SkClampMax(int(ceil(dx-filter->width() + 0.5f)), dst->width()-1); |
| int x1 = SkClampMax(int(floor(dx+filter->width() + 0.5f)), dst->width()-1); |
| |
| SkPMColor c = *src->getAddr32(x,y); |
| |
| for (int dst_x = x0 ; dst_x <= x1 ; dst_x++) { |
| SkFixed weight = filter->lookup(dx - dst_x); |
| sums[4*(y*dst->width() + dst_x) + 0] += weight*SkGetPackedR32(c); |
| sums[4*(y*dst->width() + dst_x) + 1] += weight*SkGetPackedG32(c); |
| sums[4*(y*dst->width() + dst_x) + 2] += weight*SkGetPackedB32(c); |
| sums[4*(y*dst->width() + dst_x) + 3] += weight*SkGetPackedA32(c); |
| weights[y*dst->width() + dst_x] += weight; |
| } |
| } |
| } |
| |
| divideByWeights(sums, weights, dst); |
| } |
| |
| static void upScaleVert(const SkBitmap *src, SkBitmap *dst, float scale, SkBitmapFilter *filter) { |
| for (int y = 0 ; y < dst->height() ; y++) { |
| for (int x = 0 ; x < dst->width() ; x++) { |
| float sy = y / scale - 0.5f; |
| int y0 = SkClampMax(int(ceil(sy-filter->width() + 0.5f)), src->height()-1); |
| int y1 = SkClampMax(int(floor(sy+filter->width() + 0.5f)), src->height()-1); |
| |
| SkFixed total_weight = 0; |
| SkFixed fr = 0, fg = 0, fb = 0, fa = 0; |
| |
| for (int src_y = y0 ; src_y <= y1 ; src_y++) { |
| SkFixed weight = filter->lookup(sy - src_y); |
| SkPMColor c = *src->getAddr32(x,src_y); |
| fr += weight * SkGetPackedR32(c); |
| fg += weight * SkGetPackedG32(c); |
| fb += weight * SkGetPackedB32(c); |
| fa += weight * SkGetPackedA32(c); |
| total_weight += weight; |
| } |
| fr = SkFixedDiv(fr, total_weight); |
| fg = SkFixedDiv(fg, total_weight); |
| fb = SkFixedDiv(fb, total_weight); |
| fa = SkFixedDiv(fa, total_weight); |
| |
| int a = SkClampMax(SkFixedRoundToInt(fa), 255); |
| int r = SkClampMax(SkFixedRoundToInt(fr), a); |
| int g = SkClampMax(SkFixedRoundToInt(fg), a); |
| int b = SkClampMax(SkFixedRoundToInt(fb), a); |
| |
| *dst->getAddr32(x,y) = SkPackARGB32(a, r, g, b); |
| } |
| } |
| } |
| |
| static void downScaleVert(const SkBitmap *src, SkBitmap *dst, float scale, SkBitmapFilter *filter) { |
| SkFixed *sums = SkNEW_ARRAY(SkFixed, dst->width() * dst->height() * 4); |
| SkFixed *weights = SkNEW_ARRAY(SkFixed, dst->width() * dst->height()); |
| |
| SkAutoTDeleteArray<SkFixed> ada1(sums); |
| SkAutoTDeleteArray<SkFixed> ada2(weights); |
| |
| memset(sums, 0, dst->width() * dst->height() * sizeof(SkFixed) * 4); |
| memset(weights, 0, dst->width() * dst->height() * sizeof(SkFixed)); |
| |
| for (int y = 0 ; y < src->height() ; y++) { |
| for (int x = 0 ; x < src->width() ; x++) { |
| // splat each source pixel into the destination image |
| float dy = (y + 0.5f) * scale; |
| int y0 = SkClampMax(int(ceil(dy-filter->width() + 0.5f)), dst->height()-1); |
| int y1 = SkClampMax(int(floor(dy+filter->width() + 0.5f)), dst->height()-1); |
| |
| SkPMColor c = *src->getAddr32(x,y); |
| |
| for (int dst_y = y0 ; dst_y <= y1 ; dst_y++) { |
| SkFixed weight = filter->lookup(dy - dst_y); |
| sums[4*(dst_y*dst->width() + x) + 0] += weight*SkGetPackedR32(c); |
| sums[4*(dst_y*dst->width() + x) + 1] += weight*SkGetPackedG32(c); |
| sums[4*(dst_y*dst->width() + x) + 2] += weight*SkGetPackedB32(c); |
| sums[4*(dst_y*dst->width() + x) + 3] += weight*SkGetPackedA32(c); |
| weights[dst_y*dst->width() + x] += weight; |
| } |
| } |
| } |
| |
| divideByWeights(sums, weights, dst); |
| } |
| |
| void SkBitmap::scale(SkBitmap *dst) const { |
| |
| SkBitmap horiz_temp; |
| |
| horiz_temp.setConfig(SkBitmap::kARGB_8888_Config, dst->width(), height()); |
| horiz_temp.allocPixels(); |
| |
| SkBitmapFilter *filter = allocateBitmapFilter(); |
| |
| float horiz_scale = float(dst->width()) / width(); |
| |
| if (horiz_scale == 1) { |
| this->copyPixelsTo(horiz_temp.getPixels(), getSize()); |
| } else if (horiz_scale > 1) { |
| upScaleHoriz(this, &horiz_temp, horiz_scale, filter); |
| } else if (horiz_scale < 1) { |
| downScaleHoriz(this, &horiz_temp, horiz_scale, filter); |
| } |
| |
| float vert_scale = float(dst->height()) / height(); |
| |
| if (vert_scale == 1) { |
| horiz_temp.copyPixelsTo(dst->getPixels(), dst->getSize()); |
| } else if (vert_scale > 1) { |
| upScaleVert(&horiz_temp, dst, vert_scale, filter); |
| } else if (vert_scale < 1) { |
| downScaleVert(&horiz_temp, dst, vert_scale, filter); |
| } |
| |
| SkDELETE(filter); |
| } |