core/src/fxcodec/codec/fx_codec_bmp.cpp

// 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 "../../../include/fxcodec/fx_codec.h"
#include "../../../include/fxge/fx_dib.h"
#include "codec_int.h"
#include "../lbmp/fx_bmp.h"
struct FXBMP_Context {
    bmp_decompress_struct_p bmp_ptr;
    void*		parent_ptr;
    void*		child_ptr;

    void*		(*m_AllocFunc)(unsigned int);
    void		(*m_FreeFunc)(void*);
};
extern "C" {
    static void* _bmp_alloc_func(unsigned int size)
    {
        return FX_Alloc(char, size);
    }
    static void  _bmp_free_func(void* p)
    {
        if(p != NULL) {
            FX_Free(p);
        }
    }
};
static void _bmp_error_data(bmp_decompress_struct_p bmp_ptr, FX_LPCSTR err_msg)
{
    FXSYS_strncpy((char*)bmp_ptr->err_ptr, err_msg, BMP_MAX_ERROR_SIZE - 1);
    longjmp(bmp_ptr->jmpbuf, 1);
}
static void _bmp_read_scanline(bmp_decompress_struct_p bmp_ptr, FX_INT32 row_num, FX_LPBYTE row_buf)
{
    FXBMP_Context* p = (FXBMP_Context*)bmp_ptr->context_ptr;
    CCodec_BmpModule* pModule = (CCodec_BmpModule*)p->parent_ptr;
    pModule->ReadScanlineCallback(p->child_ptr, row_num, row_buf);
}
static FX_BOOL _bmp_get_data_position(bmp_decompress_struct_p bmp_ptr, FX_DWORD rcd_pos)
{
    FXBMP_Context* p = (FXBMP_Context*)bmp_ptr->context_ptr;
    CCodec_BmpModule* pModule = (CCodec_BmpModule*)p->parent_ptr;
    return pModule->InputImagePositionBufCallback(p->child_ptr, rcd_pos);
}
void* CCodec_BmpModule::Start(void* pModule)
{
    FXBMP_Context* p = (FXBMP_Context*)FX_Alloc(FX_BYTE, sizeof(FXBMP_Context));
    if (p == NULL) {
        return NULL;
    }
    FXSYS_memset32(p, 0, sizeof(FXBMP_Context));
    if(p == NULL) {
        return NULL;
    }
    p->m_AllocFunc = _bmp_alloc_func;
    p->m_FreeFunc = _bmp_free_func;
    p->bmp_ptr = NULL;
    p->parent_ptr = (void*)this;
    p->child_ptr = pModule;
    p->bmp_ptr = _bmp_create_decompress();
    if (p->bmp_ptr == NULL) {
        FX_Free(p);
        return NULL;
    }
    p->bmp_ptr->context_ptr = (void*)p;
    p->bmp_ptr->err_ptr = m_szLastError;
    p->bmp_ptr->_bmp_error_fn = _bmp_error_data;
    p->bmp_ptr->_bmp_get_row_fn = _bmp_read_scanline;
    p->bmp_ptr->_bmp_get_data_position_fn = _bmp_get_data_position;
    return p;
}
void CCodec_BmpModule::Finish(void* pContext)
{
    FXBMP_Context* p = (FXBMP_Context*)pContext;
    if(p != NULL) {
        _bmp_destroy_decompress(&p->bmp_ptr);
        p->m_FreeFunc(p);
    }
}
FX_INT32 CCodec_BmpModule::ReadHeader(void* pContext, FX_INT32* width, FX_INT32* height, FX_BOOL* tb_flag, FX_INT32* components, FX_INT32* pal_num, FX_DWORD** pal_pp, CFX_DIBAttribute* pAttribute)
{
    FXBMP_Context* p = (FXBMP_Context*)pContext;
    if(setjmp(p->bmp_ptr->jmpbuf)) {
        return 0;
    }
    FX_INT32 ret = _bmp_read_header(p->bmp_ptr);
    if (ret != 1) {
        return ret;
    }
    *width = p->bmp_ptr->width;
    *height = p->bmp_ptr->height;
    *tb_flag = p->bmp_ptr->imgTB_flag;
    *components = p->bmp_ptr->components;
    *pal_num = p->bmp_ptr->pal_num;
    *pal_pp = p->bmp_ptr->pal_ptr;
    if (pAttribute) {
        pAttribute->m_wDPIUnit = FXCODEC_RESUNIT_METER;
        pAttribute->m_nXDPI = p->bmp_ptr->dpi_x;
        pAttribute->m_nYDPI = p->bmp_ptr->dpi_y;
        pAttribute->m_nBmpCompressType = p->bmp_ptr->compress_flag;
    }
    return 1;
}
FX_INT32 CCodec_BmpModule::LoadImage(void* pContext)
{
    FXBMP_Context* p = (FXBMP_Context*)pContext;
    if(setjmp(p->bmp_ptr->jmpbuf)) {
        return 0;
    }
    return _bmp_decode_image(p->bmp_ptr);
}
FX_DWORD CCodec_BmpModule::GetAvailInput(void* pContext, FX_LPBYTE* avial_buf_ptr)
{
    FXBMP_Context* p = (FXBMP_Context*)pContext;
    return _bmp_get_avail_input(p->bmp_ptr, avial_buf_ptr);
}
void CCodec_BmpModule::Input(void* pContext, FX_LPCBYTE src_buf, FX_DWORD src_size)
{
    FXBMP_Context* p = (FXBMP_Context*)pContext;
    _bmp_input_buffer(p->bmp_ptr, (FX_LPBYTE)src_buf, src_size);
}