clone of https://codereview.chromium.org/15316014/ with teaks
BUG= Review URL: https://codereview.chromium.org/15904005 git-svn-id: http://skia.googlecode.com/svn/trunk@9264 2bbb7eff-a529-9590-31e7-b0007b416f81
This commit is contained in:
reed@google.com
parent
0f8990cd2c
commit
4c69a064b4
@ -27,6 +27,7 @@
|
||||
'<(skia_src_path)/core/SkBitmapProcShader.h',
|
||||
'<(skia_src_path)/core/SkBitmapProcState.cpp',
|
||||
'<(skia_src_path)/core/SkBitmapProcState.h',
|
||||
'<(skia_src_path)/core/SkBitmapProcBicubic.cpp',
|
||||
'<(skia_src_path)/core/SkBitmapProcState_matrix.h',
|
||||
'<(skia_src_path)/core/SkBitmapProcState_matrixProcs.cpp',
|
||||
'<(skia_src_path)/core/SkBitmapProcState_sample.h',
|
||||
|
||||
115
src/core/SkBitmapProcBicubic.cpp
Normal file
115
src/core/SkBitmapProcBicubic.cpp
Normal file
@ -0,0 +1,115 @@
|
||||
/*
|
||||
* 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 "SkBitmapProcBicubic.h"
|
||||
#include "SkBitmap.h"
|
||||
#include "SkColor.h"
|
||||
#include "SkColorPriv.h"
|
||||
#include "SkUnPreMultiply.h"
|
||||
#include "SkRTConf.h"
|
||||
#include "SkShader.h"
|
||||
|
||||
#define DS(x) SkDoubleToScalar(x)
|
||||
|
||||
inline SkPMColor cubicBlend(const SkScalar c[16], SkScalar t, SkPMColor c0, SkPMColor c1, SkPMColor c2, SkPMColor c3) {
|
||||
SkScalar t2 = t * t, t3 = t2 * t;
|
||||
SkScalar cc[4];
|
||||
cc[0] = c[0] + SkScalarMul(c[1], t) + SkScalarMul(c[2], t2) + SkScalarMul(c[3], t3);
|
||||
cc[1] = c[4] + SkScalarMul(c[5], t) + SkScalarMul(c[6], t2) + SkScalarMul(c[7], t3);
|
||||
cc[2] = c[8] + SkScalarMul(c[9], t) + SkScalarMul(c[10], t2) + SkScalarMul(c[11], t3);
|
||||
cc[3] = c[12] + SkScalarMul(c[13], t) + SkScalarMul(c[14], t2) + SkScalarMul(c[15], t3);
|
||||
SkScalar a = SkScalarClampMax(SkScalarMul(cc[0], SkGetPackedA32(c0)) + SkScalarMul(cc[1], SkGetPackedA32(c1)) + SkScalarMul(cc[2], SkGetPackedA32(c2)) + SkScalarMul(cc[3], SkGetPackedA32(c3)), 255);
|
||||
SkScalar r = SkScalarMul(cc[0], SkGetPackedR32(c0)) + SkScalarMul(cc[1], SkGetPackedR32(c1)) + SkScalarMul(cc[2], SkGetPackedR32(c2)) + SkScalarMul(cc[3], SkGetPackedR32(c3));
|
||||
SkScalar g = SkScalarMul(cc[0], SkGetPackedG32(c0)) + SkScalarMul(cc[1], SkGetPackedG32(c1)) + SkScalarMul(cc[2], SkGetPackedG32(c2)) + SkScalarMul(cc[3], SkGetPackedG32(c3));
|
||||
SkScalar b = SkScalarMul(cc[0], SkGetPackedB32(c0)) + SkScalarMul(cc[1], SkGetPackedB32(c1)) + SkScalarMul(cc[2], SkGetPackedB32(c2)) + SkScalarMul(cc[3], SkGetPackedB32(c3));
|
||||
return SkPackARGB32(SkScalarRoundToInt(a),
|
||||
SkScalarRoundToInt(SkScalarClampMax(r, a)),
|
||||
SkScalarRoundToInt(SkScalarClampMax(g, a)),
|
||||
SkScalarRoundToInt(SkScalarClampMax(b, a)));
|
||||
}
|
||||
|
||||
static void bicubicFilter(const SkBitmapProcState& s, int x, int y,
|
||||
SkPMColor colors[], int count) {
|
||||
|
||||
static const SkScalar coefficients[16] = {
|
||||
DS( 1.0 / 18.0), DS(-9.0 / 18.0), DS( 15.0 / 18.0), DS( -7.0 / 18.0),
|
||||
DS(16.0 / 18.0), DS( 0.0 / 18.0), DS(-36.0 / 18.0), DS( 21.0 / 18.0),
|
||||
DS( 1.0 / 18.0), DS( 9.0 / 18.0), DS( 27.0 / 18.0), DS(-21.0 / 18.0),
|
||||
DS( 0.0 / 18.0), DS( 0.0 / 18.0), DS( -6.0 / 18.0), DS( 7.0 / 18.0),
|
||||
};
|
||||
|
||||
SkPMColor *dptr = &(colors[0]);
|
||||
while (count-- > 0) {
|
||||
SkPoint srcPt;
|
||||
s.fInvProc(*s.fInvMatrix, SkIntToScalar(x),
|
||||
SkIntToScalar(y), &srcPt);
|
||||
srcPt.fX -= SK_ScalarHalf;
|
||||
srcPt.fY -= SK_ScalarHalf;
|
||||
SkScalar fractx = srcPt.fX - SkScalarFloorToScalar(srcPt.fX);
|
||||
SkScalar fracty = srcPt.fY - SkScalarFloorToScalar(srcPt.fY);
|
||||
int sx = SkScalarFloorToInt(srcPt.fX);
|
||||
int sy = SkScalarFloorToInt(srcPt.fY);
|
||||
int x0 = SkClampMax(sx - 1, s.fBitmap->width() - 1);
|
||||
int x1 = SkClampMax(sx , s.fBitmap->width() - 1);
|
||||
int x2 = SkClampMax(sx + 1, s.fBitmap->width() - 1);
|
||||
int x3 = SkClampMax(sx + 2, s.fBitmap->width() - 1);
|
||||
int y0 = SkClampMax(sy - 1, s.fBitmap->height() - 1);
|
||||
int y1 = SkClampMax(sy , s.fBitmap->height() - 1);
|
||||
int y2 = SkClampMax(sy + 1, s.fBitmap->height() - 1);
|
||||
int y3 = SkClampMax(sy + 2, s.fBitmap->height() - 1);
|
||||
SkPMColor s00 = *s.fBitmap->getAddr32(x0, y0);
|
||||
SkPMColor s10 = *s.fBitmap->getAddr32(x1, y0);
|
||||
SkPMColor s20 = *s.fBitmap->getAddr32(x2, y0);
|
||||
SkPMColor s30 = *s.fBitmap->getAddr32(x3, y0);
|
||||
SkPMColor s0 = cubicBlend(coefficients, fractx, s00, s10, s20, s30);
|
||||
SkPMColor s01 = *s.fBitmap->getAddr32(x0, y1);
|
||||
SkPMColor s11 = *s.fBitmap->getAddr32(x1, y1);
|
||||
SkPMColor s21 = *s.fBitmap->getAddr32(x2, y1);
|
||||
SkPMColor s31 = *s.fBitmap->getAddr32(x3, y1);
|
||||
SkPMColor s1 = cubicBlend(coefficients, fractx, s01, s11, s21, s31);
|
||||
SkPMColor s02 = *s.fBitmap->getAddr32(x0, y2);
|
||||
SkPMColor s12 = *s.fBitmap->getAddr32(x1, y2);
|
||||
SkPMColor s22 = *s.fBitmap->getAddr32(x2, y2);
|
||||
SkPMColor s32 = *s.fBitmap->getAddr32(x3, y2);
|
||||
SkPMColor s2 = cubicBlend(coefficients, fractx, s02, s12, s22, s32);
|
||||
SkPMColor s03 = *s.fBitmap->getAddr32(x0, y3);
|
||||
SkPMColor s13 = *s.fBitmap->getAddr32(x1, y3);
|
||||
SkPMColor s23 = *s.fBitmap->getAddr32(x2, y3);
|
||||
SkPMColor s33 = *s.fBitmap->getAddr32(x3, y3);
|
||||
SkPMColor s3 = cubicBlend(coefficients, fractx, s03, s13, s23, s33);
|
||||
*dptr++ = cubicBlend(coefficients, fracty, s0, s1, s2, s3);
|
||||
x++;
|
||||
}
|
||||
}
|
||||
|
||||
SkBitmapProcState::ShaderProc32
|
||||
SkBitmapProcState::chooseBicubicFilterProc(const SkPaint& paint) {
|
||||
// we need to be requested
|
||||
uint32_t mask = SkPaint::kFilterBitmap_Flag
|
||||
| SkPaint::kBicubicFilterBitmap_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;
|
||||
}
|
||||
|
||||
return bicubicFilter;
|
||||
}
|
||||
@ -301,9 +301,14 @@ bool SkBitmapProcState::chooseProcs(const SkMatrix& inv, const SkPaint& paint) {
|
||||
if (NULL == fShaderProc32) {
|
||||
fShaderProc32 = this->chooseShaderProc32();
|
||||
}
|
||||
|
||||
|
||||
// see if our platform has any accelerated overrides
|
||||
this->platformProcs();
|
||||
|
||||
if (NULL == fShaderProc32) {
|
||||
fShaderProc32 = this->chooseBicubicFilterProc(paint);
|
||||
}
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
|
||||
@ -97,6 +97,7 @@ struct SkBitmapProcState {
|
||||
*/
|
||||
void platformProcs();
|
||||
|
||||
|
||||
/** Given the byte size of the index buffer to be passed to the matrix proc,
|
||||
return the maximum number of resulting pixels that can be computed
|
||||
(i.e. the number of SkPMColor values to be written by the sample proc).
|
||||
@ -139,6 +140,12 @@ private:
|
||||
bool chooseProcs(const SkMatrix& inv, const SkPaint&);
|
||||
ShaderProc32 chooseShaderProc32();
|
||||
|
||||
|
||||
/** test method for choosing a bicubic shading filter
|
||||
*/
|
||||
|
||||
ShaderProc32 chooseBicubicFilterProc(const SkPaint &paint);
|
||||
|
||||
// Return false if we failed to setup for fast translate (e.g. overflow)
|
||||
bool setupForTranslate();
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user