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/*
Copyright (C) 2013-2017 Red Hat, Inc.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of
the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <spice/macros.h>
#include <memory>
#include <vector>
#include "vdcommon.h"
#include "image.h"
#include "imagepng.h"
ImageCoder *create_bitmap_coder();
static ImageCoder *get_coder(uint32_t vdagent_type)
{
switch (vdagent_type) {
case VD_AGENT_CLIPBOARD_IMAGE_BMP:
return create_bitmap_coder();
case VD_AGENT_CLIPBOARD_IMAGE_PNG:
return create_png_coder();
}
return NULL;
}
HANDLE get_image_handle(const VDAgentClipboard& clipboard, uint32_t size, UINT& format)
{
std::unique_ptr<ImageCoder> coder(get_coder(clipboard.type));
if (!coder) {
return NULL;
}
format = CF_DIB;
size_t dib_size = coder->get_dib_size(clipboard.data, size);
if (!dib_size) {
return NULL;
}
HANDLE clip_data = GlobalAlloc(GMEM_MOVEABLE, dib_size);
if (clip_data) {
uint8_t* dst = (uint8_t*)GlobalLock(clip_data);
if (!dst) {
GlobalFree(clip_data);
return NULL;
}
coder->get_dib_data(dst, clipboard.data, size);
GlobalUnlock(clip_data);
}
return clip_data;
}
uint8_t* get_raw_clipboard_image(const VDAgentClipboardRequest& clipboard_request,
HANDLE clip_data, long& new_size)
{
new_size = 0;
if (GetObjectType(clip_data) != OBJ_BITMAP) {
return NULL;
}
std::unique_ptr<ImageCoder> coder(get_coder(clipboard_request.type));
if (!coder) {
return NULL;
}
HPALETTE pal = 0;
if (IsClipboardFormatAvailable(CF_PALETTE)) {
pal = (HPALETTE)GetClipboardData(CF_PALETTE);
}
// extract DIB
BITMAP bitmap;
GetObject(clip_data, sizeof(bitmap), &bitmap);
struct {
BITMAPINFOHEADER head;
RGBQUAD colors[256];
} info;
BITMAPINFOHEADER& head(info.head);
memset(&head, 0, sizeof(head));
head.biSize = sizeof(head);
head.biWidth = bitmap.bmWidth;
head.biHeight = bitmap.bmHeight;
head.biPlanes = bitmap.bmPlanes;
head.biBitCount = bitmap.bmBitsPixel >= 16 ? 24 : bitmap.bmBitsPixel;
head.biCompression = BI_RGB;
HDC dc = GetDC(NULL);
HPALETTE old_pal = NULL;
if (pal) {
old_pal = (HPALETTE)SelectObject(dc, pal);
RealizePalette(dc);
}
size_t stride = compute_dib_stride(head.biWidth, head.biBitCount);
std::vector<uint8_t> bits(stride * head.biHeight);
int res = GetDIBits(dc, (HBITMAP) clip_data, 0, head.biHeight,
&bits[0], (LPBITMAPINFO)&info, DIB_RGB_COLORS);
if (pal) {
SelectObject(dc, old_pal);
}
ReleaseDC(NULL, dc);
if (!res) {
return NULL;
}
// convert DIB to desired format
return coder->from_bitmap(*(LPBITMAPINFO)&info, &bits[0], new_size);
}
void free_raw_clipboard_image(uint8_t *data)
{
free(data);
}
class BitmapCoder: public ImageCoder
{
public:
BitmapCoder() {};
size_t get_dib_size(const uint8_t *data, size_t size);
void get_dib_data(uint8_t *dib, const uint8_t *data, size_t size);
uint8_t *from_bitmap(const BITMAPINFO& info, const void *bits, long &size);
};
size_t BitmapCoder::get_dib_size(const uint8_t *data, size_t size)
{
if (memcmp(data, "BM", 2) == 0)
return size > 14 ? size - 14 : 0;
return size;
}
void BitmapCoder::get_dib_data(uint8_t *dib, const uint8_t *data, size_t size)
{
// just strip the file header if present, images can be either BMP or DIB
size_t new_size = get_dib_size(data, size);
memcpy(dib, data + (size - new_size), new_size);
}
uint8_t *BitmapCoder::from_bitmap(const BITMAPINFO& info, const void *bits, long &size)
{
BITMAPFILEHEADER file_hdr;
const BITMAPINFOHEADER& head(info.bmiHeader);
const DWORD max_palette_colors = head.biBitCount <= 8 ? 1 << head.biBitCount : 0;
size_t palette_size = sizeof(RGBQUAD) * std::min(head.biClrUsed, max_palette_colors);
const size_t stride = compute_dib_stride(head.biWidth, head.biBitCount);
const size_t image_size = stride * head.biHeight;
size = sizeof(file_hdr) + sizeof(head) + palette_size + image_size;
file_hdr.bfType = 'B' + 'M'*256u;
file_hdr.bfSize = size;
file_hdr.bfReserved1 = 0;
file_hdr.bfReserved2 = 0;
file_hdr.bfOffBits = sizeof(file_hdr) + sizeof(head) + palette_size;
uint8_t *data = (uint8_t *) malloc(size);
if (!data) {
return NULL;
}
memcpy(data, &file_hdr, sizeof(file_hdr));
memcpy(data + sizeof(file_hdr), &info, sizeof(head) + palette_size);
memcpy(data + sizeof(file_hdr) + sizeof(head) + palette_size, bits, image_size);
return data;
}
ImageCoder *create_bitmap_coder()
{
return new BitmapCoder();
}
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