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// Copyright 2014 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
#include <algorithm>
#include "core/fxcodec/codec/codec_int.h"
#include "core/include/fxcodec/fx_codec.h"
#include "core/include/fxge/fx_dib.h"
extern "C" {
#undef FAR
#include "third_party/libpng16/png.h"
}
static void _png_error_data(png_structp png_ptr, png_const_charp error_msg) {
if (png_get_error_ptr(png_ptr)) {
FXSYS_strncpy((char*)png_get_error_ptr(png_ptr), error_msg,
PNG_ERROR_SIZE - 1);
}
longjmp(png_jmpbuf(png_ptr), 1);
}
static void _png_warning_data(png_structp png_ptr, png_const_charp error_msg) {}
static void _png_load_bmp_attribute(png_structp png_ptr,
png_infop info_ptr,
CFX_DIBAttribute* pAttribute) {
if (pAttribute) {
#if defined(PNG_pHYs_SUPPORTED)
pAttribute->m_nXDPI = png_get_x_pixels_per_meter(png_ptr, info_ptr);
pAttribute->m_nYDPI = png_get_y_pixels_per_meter(png_ptr, info_ptr);
png_uint_32 res_x, res_y;
int unit_type;
png_get_pHYs(png_ptr, info_ptr, &res_x, &res_y, &unit_type);
switch (unit_type) {
case PNG_RESOLUTION_METER:
pAttribute->m_wDPIUnit = FXCODEC_RESUNIT_METER;
break;
default:
pAttribute->m_wDPIUnit = FXCODEC_RESUNIT_NONE;
}
#endif
#if defined(PNG_iCCP_SUPPORTED)
png_charp icc_name;
png_bytep icc_profile;
png_uint_32 icc_proflen;
int compress_type;
png_get_iCCP(png_ptr, info_ptr, &icc_name, &compress_type, &icc_profile,
&icc_proflen);
#endif
int bTime = 0;
#if defined(PNG_tIME_SUPPORTED)
png_timep t = NULL;
png_get_tIME(png_ptr, info_ptr, &t);
if (t) {
FXSYS_memset(pAttribute->m_strTime, 0, sizeof(pAttribute->m_strTime));
FXSYS_snprintf((FX_CHAR*)pAttribute->m_strTime,
sizeof(pAttribute->m_strTime), "%4d:%2d:%2d %2d:%2d:%2d",
t->year, t->month, t->day, t->hour, t->minute, t->second);
pAttribute->m_strTime[sizeof(pAttribute->m_strTime) - 1] = 0;
bTime = 1;
}
#endif
#if defined(PNG_TEXT_SUPPORTED)
int i;
FX_STRSIZE len;
const FX_CHAR* buf;
int num_text;
png_textp text = NULL;
png_get_text(png_ptr, info_ptr, &text, &num_text);
for (i = 0; i < num_text; i++) {
len = FXSYS_strlen(text[i].key);
buf = "Time";
if (!FXSYS_memcmp(buf, text[i].key, std::min(len, FXSYS_strlen(buf)))) {
if (!bTime) {
FXSYS_memset(pAttribute->m_strTime, 0, sizeof(pAttribute->m_strTime));
FXSYS_memcpy(
pAttribute->m_strTime, text[i].text,
std::min(sizeof(pAttribute->m_strTime) - 1, text[i].text_length));
}
} else {
buf = "Author";
if (!FXSYS_memcmp(buf, text[i].key, std::min(len, FXSYS_strlen(buf)))) {
pAttribute->m_strAuthor.Empty();
pAttribute->m_strAuthor.Load((uint8_t*)text[i].text,
(FX_STRSIZE)text[i].text_length);
}
}
}
#endif
}
}
struct FXPNG_Context {
png_structp png_ptr;
png_infop info_ptr;
void* parent_ptr;
void* child_ptr;
void* (*m_AllocFunc)(unsigned int);
void (*m_FreeFunc)(void*);
};
extern "C" {
static void* _png_alloc_func(unsigned int size) {
return FX_Alloc(char, size);
}
static void _png_free_func(void* p) {
FX_Free(p);
}
};
static void _png_get_header_func(png_structp png_ptr, png_infop info_ptr) {
FXPNG_Context* p = (FXPNG_Context*)png_get_progressive_ptr(png_ptr);
if (p == NULL) {
return;
}
CCodec_PngModule* pModule = (CCodec_PngModule*)p->parent_ptr;
if (pModule == NULL) {
return;
}
png_uint_32 width = 0, height = 0;
int bpc = 0, color_type = 0, color_type1 = 0, pass = 0;
double gamma = 1.0;
png_get_IHDR(png_ptr, info_ptr, &width, &height, &bpc, &color_type, NULL,
NULL, NULL);
color_type1 = color_type;
if (bpc > 8) {
png_set_strip_16(png_ptr);
} else if (bpc < 8) {
png_set_expand_gray_1_2_4_to_8(png_ptr);
}
bpc = 8;
if (color_type == PNG_COLOR_TYPE_PALETTE) {
png_set_palette_to_rgb(png_ptr);
}
pass = png_set_interlace_handling(png_ptr);
if (!pModule->ReadHeaderCallback(p->child_ptr, width, height, bpc, pass,
&color_type, &gamma)) {
png_error(p->png_ptr, "Read Header Callback Error");
}
int intent;
if (png_get_sRGB(png_ptr, info_ptr, &intent)) {
png_set_gamma(png_ptr, gamma, 0.45455);
} else {
double image_gamma;
if (png_get_gAMA(png_ptr, info_ptr, &image_gamma)) {
png_set_gamma(png_ptr, gamma, image_gamma);
} else {
png_set_gamma(png_ptr, gamma, 0.45455);
}
}
switch (color_type) {
case PNG_COLOR_TYPE_GRAY:
case PNG_COLOR_TYPE_GRAY_ALPHA: {
if (color_type1 & PNG_COLOR_MASK_COLOR) {
png_set_rgb_to_gray(png_ptr, 1, 0.299, 0.587);
}
} break;
case PNG_COLOR_TYPE_PALETTE:
if (color_type1 != PNG_COLOR_TYPE_PALETTE) {
png_error(p->png_ptr, "Not Support Output Palette Now");
}
case PNG_COLOR_TYPE_RGB:
case PNG_COLOR_TYPE_RGB_ALPHA:
if (!(color_type1 & PNG_COLOR_MASK_COLOR)) {
png_set_gray_to_rgb(png_ptr);
}
png_set_bgr(png_ptr);
break;
}
if (!(color_type & PNG_COLOR_MASK_ALPHA)) {
png_set_strip_alpha(png_ptr);
}
if (color_type & PNG_COLOR_MASK_ALPHA &&
!(color_type1 & PNG_COLOR_MASK_ALPHA)) {
png_set_filler(png_ptr, 0xff, PNG_FILLER_AFTER);
}
png_read_update_info(png_ptr, info_ptr);
}
static void _png_get_end_func(png_structp png_ptr, png_infop info_ptr) {}
static void _png_get_row_func(png_structp png_ptr,
png_bytep new_row,
png_uint_32 row_num,
int pass) {
FXPNG_Context* p = (FXPNG_Context*)png_get_progressive_ptr(png_ptr);
if (p == NULL) {
return;
}
CCodec_PngModule* pModule = (CCodec_PngModule*)p->parent_ptr;
uint8_t* src_buf = NULL;
if (!pModule->AskScanlineBufCallback(p->child_ptr, row_num, src_buf)) {
png_error(png_ptr, "Ask Scanline buffer Callback Error");
}
if (src_buf) {
png_progressive_combine_row(png_ptr, src_buf, new_row);
}
pModule->FillScanlineBufCompletedCallback(p->child_ptr, pass, row_num);
}
void* CCodec_PngModule::Start(void* pModule) {
FXPNG_Context* p = (FXPNG_Context*)FX_Alloc(uint8_t, sizeof(FXPNG_Context));
if (p == NULL) {
return NULL;
}
p->m_AllocFunc = _png_alloc_func;
p->m_FreeFunc = _png_free_func;
p->png_ptr = NULL;
p->info_ptr = NULL;
p->parent_ptr = (void*)this;
p->child_ptr = pModule;
p->png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (p->png_ptr == NULL) {
FX_Free(p);
return NULL;
}
p->info_ptr = png_create_info_struct(p->png_ptr);
if (p->info_ptr == NULL) {
png_destroy_read_struct(&(p->png_ptr), (png_infopp)NULL, (png_infopp)NULL);
FX_Free(p);
return NULL;
}
if (setjmp(png_jmpbuf(p->png_ptr))) {
if (p) {
png_destroy_read_struct(&(p->png_ptr), &(p->info_ptr), (png_infopp)NULL);
FX_Free(p);
}
return NULL;
}
png_set_progressive_read_fn(p->png_ptr, p, _png_get_header_func,
_png_get_row_func, _png_get_end_func);
png_set_error_fn(p->png_ptr, m_szLastError, (png_error_ptr)_png_error_data,
(png_error_ptr)_png_warning_data);
return p;
}
void CCodec_PngModule::Finish(void* pContext) {
FXPNG_Context* p = (FXPNG_Context*)pContext;
if (p) {
png_destroy_read_struct(&(p->png_ptr), &(p->info_ptr), (png_infopp)NULL);
p->m_FreeFunc(p);
}
}
FX_BOOL CCodec_PngModule::Input(void* pContext,
const uint8_t* src_buf,
uint32_t src_size,
CFX_DIBAttribute* pAttribute) {
FXPNG_Context* p = (FXPNG_Context*)pContext;
if (setjmp(png_jmpbuf(p->png_ptr))) {
if (pAttribute &&
0 == FXSYS_strcmp(m_szLastError, "Read Header Callback Error")) {
_png_load_bmp_attribute(p->png_ptr, p->info_ptr, pAttribute);
}
return FALSE;
}
png_process_data(p->png_ptr, p->info_ptr, (uint8_t*)src_buf, src_size);
return TRUE;
}
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