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Unified Diff: src/core/SkBitmapFilter.cpp

Issue 18942002: fix compile warnings (Closed) Base URL: https://skia.googlecode.com/svn/trunk
Patch Set: virtual destructor Created 7 years, 5 months ago
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Index: src/core/SkBitmapFilter.cpp
diff --git a/src/core/SkBitmapFilter.cpp b/src/core/SkBitmapFilter.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..79c0a98781c410029b2dd7d0fe1a99b55d4ea211
--- /dev/null
+++ b/src/core/SkBitmapFilter.cpp
@@ -0,0 +1,374 @@
+/*
+ * 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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