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/*
* 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);
}
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