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/*
* Copyright 2012 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "picture_utils.h"
#include "SkBitmap.h"
#include "SkColorPriv.h"
#include "SkHalf.h"
#include "SkImageEncoder.h"
#include "SkOSFile.h"
#include "SkOSPath.h"
#include "SkPM4fPriv.h"
#include "SkPicture.h"
#include "SkStream.h"
#include "SkString.h"
#include "sk_tool_utils.h"
namespace sk_tools {
void force_all_opaque(const SkBitmap& bitmap) {
SkASSERT(kN32_SkColorType == bitmap.colorType());
if (kN32_SkColorType == bitmap.colorType()) {
return;
}
SkAutoLockPixels lock(bitmap);
for (int y = 0; y < bitmap.height(); y++) {
for (int x = 0; x < bitmap.width(); x++) {
*bitmap.getAddr32(x, y) |= (SK_A32_MASK << SK_A32_SHIFT);
}
}
}
void replace_char(SkString* str, const char oldChar, const char newChar) {
if (nullptr == str) {
return;
}
for (size_t i = 0; i < str->size(); ++i) {
if (oldChar == str->operator[](i)) {
str->operator[](i) = newChar;
}
}
}
bool is_percentage(const char* const string) {
SkString skString(string);
return skString.endsWith("%");
}
void setup_bitmap(SkBitmap* bitmap, int width, int height) {
bitmap->allocN32Pixels(width, height);
bitmap->eraseColor(SK_ColorTRANSPARENT);
}
bool write_bitmap_to_disk(const SkBitmap& bm, const SkString& dirPath,
const char *subdirOrNull, const SkString& baseName) {
SkString partialPath;
if (subdirOrNull) {
partialPath = SkOSPath::Join(dirPath.c_str(), subdirOrNull);
sk_mkdir(partialPath.c_str());
} else {
partialPath.set(dirPath);
}
SkString fullPath = SkOSPath::Join(partialPath.c_str(), baseName.c_str());
if (sk_tool_utils::EncodeImageToFile(fullPath.c_str(), bm, SkEncodedImageFormat::kPNG, 100)) {
return true;
} else {
SkDebugf("Failed to write the bitmap to %s.\n", fullPath.c_str());
return false;
}
}
sk_sp<SkData> encode_bitmap_for_png(SkBitmap bitmap) {
const int w = bitmap.width(),
h = bitmap.height();
// PNG wants unpremultiplied 8-bit RGBA pixels (16-bit could work fine too).
// We leave the gamma of these bytes unspecified, to continue the status quo,
// which we think generally is to interpret them as sRGB.
SkAutoTMalloc<uint32_t> rgba(w*h);
auto srgbColorSpace = SkColorSpace::MakeNamed(SkColorSpace::kSRGB_Named);
if (bitmap. colorType() == kN32_SkColorType &&
bitmap.colorSpace() == srgbColorSpace.get()) {
// These are premul sRGB 8-bit pixels in SkPMColor order.
// We want unpremul sRGB 8-bit pixels in RGBA order. We'll get there via floats.
bitmap.lockPixels();
auto px = (const uint32_t*)bitmap.getPixels();
if (!px) {
return nullptr;
}
for (int i = 0; i < w*h; i++) {
Sk4f fs = Sk4f_fromS32(px[i]); // Convert up to linear floats.
#if defined(SK_PMCOLOR_IS_BGRA)
fs = SkNx_shuffle<2,1,0,3>(fs); // Shuffle to RGBA, if not there already.
#endif
float invA = 1.0f / fs[3];
fs = fs * Sk4f(invA, invA, invA, 1); // Unpremultiply.
rgba[i] = Sk4f_toS32(fs); // Pack down to sRGB bytes.
}
} else if (bitmap.colorType() == kRGBA_F16_SkColorType) {
// These are premul linear half-float pixels in RGBA order.
// We want unpremul sRGB 8-bit pixels in RGBA order. We'll get there via floats.
bitmap.lockPixels();
auto px = (const uint64_t*)bitmap.getPixels();
if (!px) {
return nullptr;
}
for (int i = 0; i < w*h; i++) {
// Convert up to linear floats.
Sk4f fs(SkHalfToFloat(static_cast<SkHalf>(px[i] >> (0 * 16))),
SkHalfToFloat(static_cast<SkHalf>(px[i] >> (1 * 16))),
SkHalfToFloat(static_cast<SkHalf>(px[i] >> (2 * 16))),
SkHalfToFloat(static_cast<SkHalf>(px[i] >> (3 * 16))));
fs = Sk4f::Max(0.0f, Sk4f::Min(fs, 1.0f)); // Clamp
float invA = 1.0f / fs[3];
fs = fs * Sk4f(invA, invA, invA, 1); // Unpremultiply.
rgba[i] = Sk4f_toS32(fs); // Pack down to sRGB bytes.
}
} else {
// We "should" gamma correct in here but we don't.
// We want Gold to show exactly what our clients are seeing, broken gamma.
// Convert smaller formats up to premul linear 8-bit (in SkPMColor order).
if (bitmap.colorType() != kN32_SkColorType) {
SkBitmap n32;
if (!bitmap.copyTo(&n32, kN32_SkColorType)) {
return nullptr;
}
bitmap = n32;
}
// Convert premul linear 8-bit to unpremul linear 8-bit RGBA.
if (!bitmap.readPixels(SkImageInfo::Make(w,h, kRGBA_8888_SkColorType,
kUnpremul_SkAlphaType),
rgba, 4*w, 0,0)) {
return nullptr;
}
}
return SkData::MakeFromMalloc(rgba.release(), w*h*sizeof(uint32_t));
}
} // namespace sk_tools
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