struct image* image_from_png(const unsigned char* data, size_t sz) {
/* Check file data header */
if (png_sig_cmp(data, 0, 8)) {
set_last_asset_load_error("Incorrect png header");
return 0;
}
/* Allocate needed structures */
png_struct* png = png_create_read_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0);
png_info* info = png_create_info_struct(png);
png_info* end_info = png_create_info_struct(png);
/* Register custom reader function */
struct png_read_callback_data cbdata;
cbdata.src_buf = (unsigned char*)data;
cbdata.sz = sz;
png_set_read_fn(png, (void*)&cbdata, png_read_callback_fn);
/* Read image info */
png_set_sig_bytes(png, 0);
png_read_info(png, info);
/* Gather image info */
int width = png_get_image_width(png, info);
int height = png_get_image_height(png, info);
/* Bits per CHANNEL not per pixel */
/* int bit_depth = png_get_bit_depth(png, info); */
int channels = png_get_channels(png, info);
/* Image to be returned */
struct image* im = image_blank(width, height, channels);
/* Read by row */
png_byte** row_ptrs = malloc(height * sizeof(png_byte*));
const size_t stride = png_get_rowbytes(png, info);
for (int i = 0; i < height; ++i) {
int q = (height - i - 1) * stride;
row_ptrs[i] = im->data + q;
}
png_read_image(png, row_ptrs);
free(row_ptrs);
/* Free allocated structures */
png_destroy_read_struct(0, 0, &end_info);
png_destroy_read_struct(0, &info, 0);
png_destroy_read_struct(&png, 0, 0);
/* Return read image */
return im;
}
virtual void OnMouseKey(wxMouseEvent& event)
{
event.Skip();
#ifndef _MAC
if(!HasCapture())
{
if(event.Button(wxMOUSE_BTN_LEFT) && event.ButtonDown())
{
wxImage image_blank(1, 1);
image_blank.SetMask();
image_blank.SetMaskColour(0, 0, 0);
SetCursor(image_blank);
mouse_pos = event.GetPosition();
CaptureMouse();
wxCommandEvent ev(evtMouseCapture, evID_MOUSE_CAPTURED);
wxPostEvent(this, ev);
}
}
else
Handler()->OnMouse(MA_BUTTON, event.Button(wxMOUSE_BTN_LEFT) ? 0 : 1, event.ButtonDown());
#endif//_MAC
}