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/*
* Copyright 2007 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkImageEncoder.h"
#include "SkColorPriv.h"
#include "SkDither.h"
#include "SkStream.h"
#include "SkTemplates.h"
#include "SkTime.h"
#include "SkUtils.h"
#include "SkRTConf.h"
#include "SkRect.h"
#include "SkCanvas.h"
#include <stdio.h>
#include "SkJPEGWriteUtility.h"
extern "C" {
#include "jpeglib.h"
#include "jerror.h"
}
// These enable timing code that report milliseconds for an encoding
//#define TIME_ENCODE
// this enables our rgb->yuv code, which is faster than libjpeg on ARM
#define WE_CONVERT_TO_YUV
///////////////////////////////////////////////////////////////////////////////
#include "SkColorPriv.h"
// taken from jcolor.c in libjpeg
#if 0 // 16bit - precise but slow
#define CYR 19595 // 0.299
#define CYG 38470 // 0.587
#define CYB 7471 // 0.114
#define CUR -11059 // -0.16874
#define CUG -21709 // -0.33126
#define CUB 32768 // 0.5
#define CVR 32768 // 0.5
#define CVG -27439 // -0.41869
#define CVB -5329 // -0.08131
#define CSHIFT 16
#else // 8bit - fast, slightly less precise
#define CYR 77 // 0.299
#define CYG 150 // 0.587
#define CYB 29 // 0.114
#define CUR -43 // -0.16874
#define CUG -85 // -0.33126
#define CUB 128 // 0.5
#define CVR 128 // 0.5
#define CVG -107 // -0.41869
#define CVB -21 // -0.08131
#define CSHIFT 8
#endif
static void rgb2yuv_32(uint8_t dst[], SkPMColor c) {
int r = SkGetPackedR32(c);
int g = SkGetPackedG32(c);
int b = SkGetPackedB32(c);
int y = ( CYR*r + CYG*g + CYB*b ) >> CSHIFT;
int u = ( CUR*r + CUG*g + CUB*b ) >> CSHIFT;
int v = ( CVR*r + CVG*g + CVB*b ) >> CSHIFT;
dst[0] = SkToU8(y);
dst[1] = SkToU8(u + 128);
dst[2] = SkToU8(v + 128);
}
static void rgb2yuv_4444(uint8_t dst[], U16CPU c) {
int r = SkGetPackedR4444(c);
int g = SkGetPackedG4444(c);
int b = SkGetPackedB4444(c);
int y = ( CYR*r + CYG*g + CYB*b ) >> (CSHIFT - 4);
int u = ( CUR*r + CUG*g + CUB*b ) >> (CSHIFT - 4);
int v = ( CVR*r + CVG*g + CVB*b ) >> (CSHIFT - 4);
dst[0] = SkToU8(y);
dst[1] = SkToU8(u + 128);
dst[2] = SkToU8(v + 128);
}
static void rgb2yuv_16(uint8_t dst[], U16CPU c) {
int r = SkGetPackedR16(c);
int g = SkGetPackedG16(c);
int b = SkGetPackedB16(c);
int y = ( 2*CYR*r + CYG*g + 2*CYB*b ) >> (CSHIFT - 2);
int u = ( 2*CUR*r + CUG*g + 2*CUB*b ) >> (CSHIFT - 2);
int v = ( 2*CVR*r + CVG*g + 2*CVB*b ) >> (CSHIFT - 2);
dst[0] = SkToU8(y);
dst[1] = SkToU8(u + 128);
dst[2] = SkToU8(v + 128);
}
///////////////////////////////////////////////////////////////////////////////
typedef void (*WriteScanline)(uint8_t* SK_RESTRICT dst,
const void* SK_RESTRICT src, int width,
const SkPMColor* SK_RESTRICT ctable);
static void Write_32_YUV(uint8_t* SK_RESTRICT dst,
const void* SK_RESTRICT srcRow, int width,
const SkPMColor*) {
const uint32_t* SK_RESTRICT src = (const uint32_t*)srcRow;
while (--width >= 0) {
#ifdef WE_CONVERT_TO_YUV
rgb2yuv_32(dst, *src++);
#else
uint32_t c = *src++;
dst[0] = SkGetPackedR32(c);
dst[1] = SkGetPackedG32(c);
dst[2] = SkGetPackedB32(c);
#endif
dst += 3;
}
}
static void Write_4444_YUV(uint8_t* SK_RESTRICT dst,
const void* SK_RESTRICT srcRow, int width,
const SkPMColor*) {
const SkPMColor16* SK_RESTRICT src = (const SkPMColor16*)srcRow;
while (--width >= 0) {
#ifdef WE_CONVERT_TO_YUV
rgb2yuv_4444(dst, *src++);
#else
SkPMColor16 c = *src++;
dst[0] = SkPacked4444ToR32(c);
dst[1] = SkPacked4444ToG32(c);
dst[2] = SkPacked4444ToB32(c);
#endif
dst += 3;
}
}
static void Write_16_YUV(uint8_t* SK_RESTRICT dst,
const void* SK_RESTRICT srcRow, int width,
const SkPMColor*) {
const uint16_t* SK_RESTRICT src = (const uint16_t*)srcRow;
while (--width >= 0) {
#ifdef WE_CONVERT_TO_YUV
rgb2yuv_16(dst, *src++);
#else
uint16_t c = *src++;
dst[0] = SkPacked16ToR32(c);
dst[1] = SkPacked16ToG32(c);
dst[2] = SkPacked16ToB32(c);
#endif
dst += 3;
}
}
static void Write_Index_YUV(uint8_t* SK_RESTRICT dst,
const void* SK_RESTRICT srcRow, int width,
const SkPMColor* SK_RESTRICT ctable) {
const uint8_t* SK_RESTRICT src = (const uint8_t*)srcRow;
while (--width >= 0) {
#ifdef WE_CONVERT_TO_YUV
rgb2yuv_32(dst, ctable[*src++]);
#else
uint32_t c = ctable[*src++];
dst[0] = SkGetPackedR32(c);
dst[1] = SkGetPackedG32(c);
dst[2] = SkGetPackedB32(c);
#endif
dst += 3;
}
}
static WriteScanline ChooseWriter(const SkBitmap& bm) {
switch (bm.colorType()) {
case kN32_SkColorType:
return Write_32_YUV;
case kRGB_565_SkColorType:
return Write_16_YUV;
case kARGB_4444_SkColorType:
return Write_4444_YUV;
case kIndex_8_SkColorType:
return Write_Index_YUV;
default:
return nullptr;
}
}
class SkJPEGImageEncoder : public SkImageEncoder {
protected:
virtual bool onEncode(SkWStream* stream, const SkBitmap& bm, int quality) {
#ifdef TIME_ENCODE
SkAutoTime atm("JPEG Encode");
#endif
SkAutoLockPixels alp(bm);
if (nullptr == bm.getPixels()) {
return false;
}
jpeg_compress_struct cinfo;
skjpeg_error_mgr sk_err;
skjpeg_destination_mgr sk_wstream(stream);
// allocate these before set call setjmp
SkAutoTMalloc<uint8_t> oneRow;
cinfo.err = jpeg_std_error(&sk_err);
sk_err.error_exit = skjpeg_error_exit;
if (setjmp(sk_err.fJmpBuf)) {
return false;
}
// Keep after setjmp or mark volatile.
const WriteScanline writer = ChooseWriter(bm);
if (nullptr == writer) {
return false;
}
jpeg_create_compress(&cinfo);
cinfo.dest = &sk_wstream;
cinfo.image_width = bm.width();
cinfo.image_height = bm.height();
cinfo.input_components = 3;
#ifdef WE_CONVERT_TO_YUV
cinfo.in_color_space = JCS_YCbCr;
#else
cinfo.in_color_space = JCS_RGB;
#endif
cinfo.input_gamma = 1;
jpeg_set_defaults(&cinfo);
cinfo.optimize_coding = TRUE;
jpeg_set_quality(&cinfo, quality, TRUE /* limit to baseline-JPEG values */);
#ifdef DCT_IFAST_SUPPORTED
cinfo.dct_method = JDCT_IFAST;
#endif
jpeg_start_compress(&cinfo, TRUE);
const int width = bm.width();
uint8_t* oneRowP = oneRow.reset(width * 3);
const SkPMColor* colors = bm.getColorTable() ? bm.getColorTable()->readColors() : nullptr;
const void* srcRow = bm.getPixels();
while (cinfo.next_scanline < cinfo.image_height) {
JSAMPROW row_pointer[1]; /* pointer to JSAMPLE row[s] */
writer(oneRowP, srcRow, width, colors);
row_pointer[0] = oneRowP;
(void) jpeg_write_scanlines(&cinfo, row_pointer, 1);
srcRow = (const void*)((const char*)srcRow + bm.rowBytes());
}
jpeg_finish_compress(&cinfo);
jpeg_destroy_compress(&cinfo);
return true;
}
};
///////////////////////////////////////////////////////////////////////////////
DEFINE_ENCODER_CREATOR(JPEGImageEncoder);
///////////////////////////////////////////////////////////////////////////////
static SkImageEncoder* sk_libjpeg_efactory(SkImageEncoder::Type t) {
return (SkImageEncoder::kJPEG_Type == t) ? new SkJPEGImageEncoder : nullptr;
}
static SkImageEncoder_EncodeReg gEReg(sk_libjpeg_efactory);
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