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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 "core/fxcodec/codec/ccodec_pngmodule.h"
#include <algorithm>
#include "core/fxcodec/codec/codec_int.h"
#include "core/fxcodec/fx_codec.h"
#include "core/fxcrt/unowned_ptr.h"
#include "core/fxge/fx_dib.h"
#include "third_party/base/compiler_specific.h"
#include "third_party/base/ptr_util.h"
#ifdef USE_SYSTEM_LIBPNG
#include <png.h>
#else
#include "third_party/libpng16/png.h"
#endif
#define PNG_ERROR_SIZE 256
class CPngContext final : public CodecModuleIface::Context {
public:
explicit CPngContext(CCodec_PngModule::Delegate* pDelegate);
~CPngContext() override;
png_structp m_pPng = nullptr;
png_infop m_pInfo = nullptr;
UnownedPtr<CCodec_PngModule::Delegate> const m_pDelegate;
char m_szLastError[PNG_ERROR_SIZE];
};
extern "C" {
void _png_error_data(png_structp png_ptr, png_const_charp error_msg) {
if (png_get_error_ptr(png_ptr)) {
strncpy(static_cast<char*>(png_get_error_ptr(png_ptr)), error_msg,
PNG_ERROR_SIZE - 1);
}
longjmp(png_jmpbuf(png_ptr), 1);
}
void _png_warning_data(png_structp png_ptr, png_const_charp error_msg) {}
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
#if defined(PNG_TEXT_SUPPORTED)
int num_text;
png_textp text = nullptr;
png_get_text(png_ptr, info_ptr, &text, &num_text);
#endif
}
}
void _png_get_header_func(png_structp png_ptr, png_infop info_ptr) {
auto* pContext =
reinterpret_cast<CPngContext*>(png_get_progressive_ptr(png_ptr));
if (!pContext)
return;
png_uint_32 width = 0;
png_uint_32 height = 0;
int bpc = 0;
int color_type = 0;
png_get_IHDR(png_ptr, info_ptr, &width, &height, &bpc, &color_type, nullptr,
nullptr, nullptr);
int 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);
int pass = png_set_interlace_handling(png_ptr);
double gamma = 1.0;
if (!pContext->m_pDelegate->PngReadHeader(width, height, bpc, pass,
&color_type, &gamma)) {
png_error(pContext->m_pPng, "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(pContext->m_pPng, "Not Support Output Palette Now");
}
FALLTHROUGH;
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);
}
void _png_get_end_func(png_structp png_ptr, png_infop info_ptr) {}
void _png_get_row_func(png_structp png_ptr,
png_bytep new_row,
png_uint_32 row_num,
int pass) {
auto* pContext =
reinterpret_cast<CPngContext*>(png_get_progressive_ptr(png_ptr));
if (!pContext)
return;
uint8_t* src_buf;
if (!pContext->m_pDelegate->PngAskScanlineBuf(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);
pContext->m_pDelegate->PngFillScanlineBufCompleted(pass, row_num);
}
} // extern "C"
CPngContext::CPngContext(CCodec_PngModule::Delegate* pDelegate)
: m_pDelegate(pDelegate) {
memset(m_szLastError, 0, sizeof(m_szLastError));
}
CPngContext::~CPngContext() {
png_destroy_read_struct(m_pPng ? &m_pPng : nullptr,
m_pInfo ? &m_pInfo : nullptr, nullptr);
}
std::unique_ptr<CodecModuleIface::Context> CCodec_PngModule::Start(
Delegate* pDelegate) {
auto p = pdfium::MakeUnique<CPngContext>(pDelegate);
p->m_pPng =
png_create_read_struct(PNG_LIBPNG_VER_STRING, nullptr, nullptr, nullptr);
if (!p->m_pPng)
return nullptr;
p->m_pInfo = png_create_info_struct(p->m_pPng);
if (!p->m_pInfo)
return nullptr;
if (setjmp(png_jmpbuf(p->m_pPng)))
return nullptr;
png_set_progressive_read_fn(p->m_pPng, p.get(), _png_get_header_func,
_png_get_row_func, _png_get_end_func);
png_set_error_fn(p->m_pPng, p->m_szLastError, _png_error_data,
_png_warning_data);
return p;
}
FX_FILESIZE CCodec_PngModule::GetAvailInput(Context* pContext) const {
NOTREACHED();
return 0;
}
bool CCodec_PngModule::Input(Context* pContext,
pdfium::span<uint8_t> src_buf,
CFX_DIBAttribute* pAttribute) {
auto* ctx = static_cast<CPngContext*>(pContext);
if (setjmp(png_jmpbuf(ctx->m_pPng))) {
if (pAttribute &&
strcmp(ctx->m_szLastError, "Read Header Callback Error") == 0) {
_png_load_bmp_attribute(ctx->m_pPng, ctx->m_pInfo, pAttribute);
}
return false;
}
png_process_data(ctx->m_pPng, ctx->m_pInfo, src_buf.data(), src_buf.size());
return true;
}
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